The correct answer is :
1) Matter exists in four different natural states: solids, liquids, gases, and plasma.
2) Whether a thing is a solid, liquid, or gas depends on two factors:
a substance's constituent atoms, molecules, or ions are made up of their individual kinetic energies. The particles are typically kept apart by kinetic energy. The intermolecular forces that tend to bind particles together with attractive force.
A substance won't condense into a liquid or solid if the average kinetic energy is higher than the attraction forces holding the particles together. A liquid or solid will develop if the kinetic energy is lower than the attraction forces.
3) A solid is distinguished by its structural rigidity and resistance to external forces. A solid substance, unlike a liquid, does not flow to conform to the shape of its container or, like a gas, expand to cover the entire space.
4) Particles that are organised in three dimensions make up crystalline solids. They have equivalent intermolecular forces between them. They have a distinct melting temperature and are anisotropic. The genuine solids are what they are known as. Diamond, benzoic acid, and other crystalline solids are among examples. The use of diamonds includes the creation of exquisite jewellery and the cutting of glass, among other things.
Amorphous means having no defined shape. Solid particles are arranged erratically in amorphous materials. They do not have equivalent intermolecular forces between them. Additionally, the separation between every two particles varies. They lack a recognisable geometric shape. Amorphous solids are isotropic materials that are also referred to as supercooled liquids. Glass and other amorphous solids are a few examples.
5) Because the intermolecular interactions permit the molecules to move, both the liquid and gas phases are fluid. The materials don't have set shapes in each of these phases; instead, the containers housing them shape them.
6) The ability of a fluid to resist relative motion between two surfaces that are moving at different speeds is known as viscosity. In simpler terms, viscosity refers to friction between fluid molecules or resistance to flow.
To learn more about solid, liquid and gases refer the link:
https://brainly.com/question/1675047
#SPJ9
a sinusoidal wave travels along a lightweight string with wavelength 1 and frequency f1. it reaches a heavier string, with a slower wave speed, and continues on with wavelength 2 and frequency f2. which is true?
The true statement for sinusoidal wave travelling along a light weight string =
lambda₂< lambda₁ and f₂ = f₁
λ₂ ≤ λ₂
Sinusoidal wave :
The sine or sinusoidal wave may be a curve that describes a smooth repetitive oscillation. we will define the sine wave as “The wave form in which the amplitude is always proportional to sine of its displacement angle at every point of time”. All waves are often made by adding up sine waves
Why is it called sinusoidal wave?Then the waveform shape produced by our simple single loop generator is usually referred to as a Sine Wave as it is said to be sinusoidal in its shape. this sort of waveform is called a sine wave because it is based on the trigonometric sine function used in mathematics.
Learn more about sinusoidal wave :
brainly.com/question/28446873
#SPJ4
Sameer went on his bike from Delhi to Gurgaon at a speed of 60km/hr and came back at a speed of 40km/hr. what is his average speed for entire journey.
The average speed for the entire journey is 48 km/hr.
The average speed is the sum distance which is traveled by the object in a particular time interval, as the average speed is a scalar quantity and it is presented by the magnitude and has no direction.
here the first speed v₁ is 60 km/hr and the second speed v₂ is the 40 km/hr .So, The formula we are referring to for calculating the average speed
S = 2v₁v₂/(v₁+v₂)
here, v₁+v₂ = 60+40 =100
Now substituting the desired values in the formula
= 2 x 60 x40/(100)
= 4800/100
= 48 km/hr
To know more about average speed refer to the link https://brainly.com/question/9834403?referrer=searchResults.
#SPJ9
A piece of plywood in which several holes are being drilled successively has been secured to workbench by means of two nails. Knowing that the drill exerts a 15-n·m couple on the piece of plywood, determine the magnitude of the resulting forces applied to the nails for the given locations. The nails are located at b and c. The magnitude of the resultant is n
The magnitude of force applied to the nails when they are located between point A and B is 37.5 N.
The magnitude of force applied to the nails when they are located between point B and C is 62.5N.
The force applied to the nails when they are located between point A and C is 29.41N
The moment exerted by the drill machine is: M =15 N⋅m
(a) The magnitude of force applied to the nails when they are located between point A and B.
Fa=M/AB
AB is distance between points A and B.
Plug in all the values in the above equation.
Fa=15 N⋅m/450mm
=15 N⋅m/0.45m
=37.5 N
Therefore, the magnitude of force applied to the nails when they are located between point A and B is 37.5 N.
(b)The magnitude of force applied to the nails when they are located between point B and C.
Fb=M/BC
BC is distance between points B and C.
Substitute all the values in the above equation.
Fb=15 N.m/240mm
=15 N.m/0.24m
= 62.5N
Thus, the magnitude of force applied to the nails when they are located between point B and C is 62.5N.
(c) The distance between points AC is,
AC=√(AB)2+(AC)2
Plug in all the values in the above equation.
AC=√(450mm)2 +(240mm)2
=510mm
=0.51m
The magnitude of force applied to the nails when they are located between point A and C.
Fc=M/AC
Substitute all the values in the above equation.
Fc=15 N⋅m/0.51m
=29.41 N
Thus, the force applied to the nails when they are located between point A and C is 29.41N
To learn more about Forces. Click, https://brainly.com/question/19997354
#SPJ4
What is the final speed?
Answer:
30 m/s
Explanation:
We can first list out the 3 kinematics equations:
[tex]v = u + at \\ {v}^{2} = {u}^{2} + 2as \\ s = ut + \frac{1}{2} a {t}^{2} [/tex]
Where:
v is the final velocity
u is the initial velocity
a is the acceleration
t is the time taken
s is the displacement
With all the 3 equations, we can now list the values needed for the first part of the question which is to find the acceleration for this first part.
Given:
v = 14 m/s
u = 6 m/s
t = 8s
We can use the first kinematics equation to solve for a. (v = u + at)
14 = 6 + a x 8
14 = 6 + 8a
8a = 14 - 6
8a = 8
a =
[tex]1 \frac{m}{ {s}^{2} } [/tex]
Now with this acceleration, we can find the final speed for the second part of the question by using the same kinematics equation. (v = u + at)
Given,
u = 14 m/s
t = 16 s
a =
[tex]1 \frac{m}{ {s}^{2} } [/tex]
v = 14 + (1)(16) = 14 + 16 = 30 m/s
How is the electrostatic force (Felect) related to the separation distance (d) the two charges?
1- Keeping the magnitude of charge on both objects constant, conduct a systematic study to collect data relating separation distance to force. The separation distance is defined as the distance between the centers of the two objects; the best strategy involves centering the objects on a gridline and using distances that are a whole number of squares.
2- Draw a graph represent relationship between force and separation
Answer:The electrostatic force is directly related to the product of the charges and inversely related to the square of the separation distance.
Explanation:
A force of 32n is applied to an area of 12.8m2. work out the pressure
HELPPP MEEEEEEE
The pressure when 32 newtons of force is applied to an area of 12.8 m² is 2.5 Pascals.
The force applied per unit area is defined as pressure.. Its S.I. unit is Pascal. 1 Pascal is equal to one Newton of force applied over an area of one meter squared. Its dimensional formula is [[tex]ML^{-1}[/tex][tex]T^{-2}[/tex]].
Pressure is directly proportional to the force applied and inversely proportional to the area over which the force is applied. And it follows the Pascal law.
Pressure = Force/Area
Given in the Question
Force = 32 Newton
Area = 12.8 m²
Put in the values, we get
Pressure = 32/12.8
Pressure = 2.5 Pascals
Therefore, the pressure when 32 newtons of force is applied to an area of 12.8 m² is 2.5 Pascals.
LEARN MORE ABOUT PRESSURE HERE:
https://brainly.com/question/25736513
#SPJ9
One way to control avalanches is to send explosive charges to key areas on mountain slopes to trigger small avalanches before larger ones can build up. Norway, for instance, uses solar- powered launchers that fire pre-timed charges. Your launcher fires charges at an angle of 70 degrees from the horizontal and a speed of 200 m/s. If you fire a charge and it travels a horizontal distance of 300 m away from you, how high up the slope will it strike?.
By using uniform motion, the high up the slope will it strike is 730.62 m.
We need to know about uniform motion to solve this problem. The uniform motion is an object's motion under acceleration. It should follow the rule
vt = vo + a . t
vt² = vo² + 2a . s
s = vo . t + 1/2 . a . t²
where vt is final velocity, vo is initial velocity, a is acceleration, t is time and s is displacement.
From the question above, we know that
θ = 70⁰
vi = 200 m/s
x = 300 m
Find the initial velocity in x and y axis
vx = vi cosθ = 68.40 m/s
vy = vi sinθ = 187.94 m/s
Find the time taken to reach 300 m
vx = x / t
68.4 = 300 / t
t = 4.39 second
Find the time taken to reach maximum height
vt = vo + a . t
0 = vy - g . t
vy = gt
187.94 = 9.8 . t
t = 19.18 second
The motion of projectile is raising to maximum height, hence
s = vo . t + 1/2 . a . t²
h = vy . t - 1/2 . g . t²
h = 187.94 . 4.39 - 1/2 . 9.8 . 4.39²
h = 730.62 m
Find more on uniform motion at: https://brainly.com/question/28040370
#SPJ4
which of the statements regarding displacement is true? displacement is a scalar quantity just as length. displacement depends on the chosen origin of coordinates. displacement has the same meaning of distance. displacement tells the average direction of motion. displacement depends on time elapsed during the motion.
The statement "displacement tells the average direction of motion" regarding displacement is true.
What is velocity?Velocity is the directional speed of a moving item as an indication of its rate of change in position as seen from a specific frame of reference and measured by a specific time standard (e.g., 60 km/h northbound). The idea of velocity is crucial in kinematics, the part of classical mechanics that explains the motion of bodies.
A physical vector quantity called velocity requires both magnitude and direction to be defined. Speed is a coherent derived unit that expresses the scalar absolute value (magnitude) of velocity. Its quantity is expressed in SI units (metric system) of metres per second (m/s or ms1). For example, "5 meters per second" is a scalar while "5 meters per second east" is a vector.
Average velocity is calculated by taking the displacement vector from the start and end-point of an object’s path, and dividing its magnitude by the time interval. The average velocity always has the same direction as that displacement vector.
Learn more about Velocity
brainly.com/question/80295?source=archive
#SPJ4
give the instantaneous velocity (including unit vector) of the object at t=1.5s
Since an object's instantaneous velocity equals the derivative of its displacement at a certain point, we can also state that the instantaneous velocity at time t = 1 is around 2 meters per second.
The derivative of x with respect to t, or the upper limit of the average velocity as the elapsed time approaches 0, is the instantaneous velocity of an object:
v (t) equals d d t x (t). v (t) equals d d t x (t).
Instantaneous velocity is a vector having a dimension of length per time, similar to average velocity. The speed of an object at a specific time is its instantaneous speed. The instantaneous velocity is obtained by adding the direction to the speed.
Learn more about velocity here-
https://brainly.com/question/18084516
#SPJ9
you're driving down the highway late one night at when a deer steps onto the road in front of you. your reaction time before stepping on the brakes is , and the maximum deceleration of your car is
The distance between you and the deer when you come to a stop is
s = d - 30 = 18 m.
The maximum speed you could have and still not hit the deer is
v = -5 + [tex]\sqrt{5}[/tex][tex]\sqrt{5 + 4d}[/tex]
= 26m/s
What is the distance between you and the deer?You're driving down the highway late one night at 20m/s when a deer steps onto road d in front of you.
Your reaction time before stepping on the brakes is 0.50s and the maximum deceleration of your car is 10m/s2.
Given,
Speed = 20m/s
Time = 0.50 s
Distance = d
Deceleration = 10m/s2
D = R × T
D = Vi × Tr
D = (20 m/s) × (0.50 s)
D = 10 m
Dd = [ Vf^2 - Vi^2 ] / [ 2 × (-10 m/s^2) ]
Dd = [ (0.0 m/s)^2 - (20 m/s)^2 ] / (-20 m/s^2)
Dd = [ -400 m^2/s^2 ] / (-20 m/s^2)
Dd = 20 m
The total distance traveled is
Dt = D + Dd
Dt = (10 m) + (20 m)
Dt = 30 m
The distance between you and the deer when you come to a stop is
s = d - 30 = 18 m.
The maximum speed you could have and still not hit the deer is
v = -5 + [tex]\sqrt{5}[/tex][tex]\sqrt{5 + 4d}[/tex]
= 26m/s
To learn more about speed, refer
https://brainly.com/question/13262646
#SPJ4
Suppose you go on a trip that covers 360 km and takes 6 Hours. What would your average speed be? 2. A car travels around a mountain. It travels a distance of 120 miles in 3 hours. What is the average speed of the car?
I need the answer for this and I want a step by step explanation on how you got the answer and if I need to use formulas.
Answer:
60 m/hStep-by-step
explanation:S = d/t
S= 360/60
S= 60
3) a current of 20 a passes through an oven’s heating element which has a resistance of 10 ω for 2.5 hours. determine the power input of the fireplace and the consumed electrical energy in kwh.
In a day, an electrical resistance heater uses 10 kW-h of electricity. In the same day, the heater delivers 9 kW-h of heat to the house in which it is located.
What is resistance ?A measurement of an object's resistance to the flow of electrical current is called electrical resistance. Electrical conductance, which gauges how easily an electric current moves, is its reciprocal quantity. Mechanical friction and electrical resistance conceptually have some similarities. Electrical resistance is measured in ohms (), the SI unit of electrical resistance, whereas electrical conductance is measured in siemens (S), also known as the mho (), the SI unit of electrical conductance.
An object's resistance is significantly influenced by the material it is constructed of. Electrical insulators like rubber typically have very high resistance and low conductance, whereas electrical conductors like metals typically have very low resistance and high conductance. Resistivity or conductivity are used to measure this relationship.
To learn more about resistance from the given link:
https://brainly.com/question/25997303
#SPJ4
in a women's 100-m race, accelerating uniformly, laura takes 2.16 s and healan 3.22 s to attain their maximum speeds, which they each maintain for the rest of the race. they cross the finish line simultaneously, both setting a world record of 10.4 s.
The acceleration of Laura is 5.32 m/s² and that of Healen is 3.75 m/s².
What is velocity?Velocity is the directional speed of a moving item as an indication of its rate of change in position as seen from a specific frame of reference and measured by a specific time standard (e.g., 60 km/h northbound). The idea of velocity is crucial in kinematics, the part of classical mechanics that explains the motion of bodies.
A physical vector quantity called velocity requires both magnitude and direction to be defined. Speed is a coherent derived unit that expresses the scalar absolute value (magnitude) of velocity. Its quantity is expressed in SI units (metric system) of metres per second (m/s or ms1). For example, "5 meters per second" is a scalar while "5 meters per second east" is a vector.
Maximum speed of Laura is [tex]\Delta_{t1} = 2s[/tex]
Maximum speed of Healen is [tex]\Delta_{t2} = 3s[/tex]
Each runs at a constant acceleration for a given time interval, giving,
[tex]\Delta x_a = \frac{1}{2} a\Delta t^2[/tex]
This reaches final velocity
⇒ [tex]v = a\Delta t[/tex]
⇒ [tex]\Delta x_v = v(T - \Delta t)[/tex]
⇒ [tex]\Delta x_v =a\Delta t(T - \Delta t)[/tex]
Each sprinter's acceleration is calculated as follows:
Laura :-
⇒ [tex]\Delta t_1 = 2s[/tex]
⇒ [tex]a_1 = \frac{100m}{18.8s^2}[/tex]
⇒ [tex]a_1[/tex] = 5.32 m/s²
Healen :-
⇒ [tex]\Delta t_2 = 3s[/tex]
⇒ [tex]a_2 = \frac{100m}{26.7s^2}[/tex]
⇒ [tex]a_2[/tex] = 3.75 m/s²
Learn more about Velocity
brainly.com/question/80295?source=archive
#SPJ4
Full question
In a women's 100 m race, accelerating uniformly, Laura takes 2.00 s and Healan 3.00 s to attain their maximum speeds, which they each maintain for the rest of the race. They cross the finish line simultaneously, both setting a world record of 10.4 s.
A) What is the acceleration of each sprinter?
an electrician needs to install a surface-mounted, nonmetallic, weatherproof cabinet on the outside of a concrete block building. since the cabinet must be mounted in a wet location, it must be mounted so there is at least in. of airspace between the cabinet and the wall.
Since the cabinet must be mounted in a wet location, it must be mounted so there is at least 1/4 of airspace between the cabinet and the wall.
What is airspace?The area of the atmosphere that is under the authority of a nation above its territory, including its territorial waters, or, more broadly, any particular three-dimensional area of the atmosphere
It is not the same as aerospace, the umbrella term for the Earth's atmosphere and the proximity of outer space.
Wherever it is deemed necessary for air traffic control to exercise any sort of direct executive oversight over aircraft operating there, that area of the sky is known as controlled airspace.
A range of areas and zones, including those where flying operations are either completely prohibited or subject to restrictions, may be included in the further division of airspace.
To learn more about airspace, refer
https://brainly.com/question/28477800
#SPJ4
Are masks effective in slowing the spread of COVID-19? In a few sentences, make a hypothesis and design and describe an experiment on how you could TEST this yourself using common household materials.
Answer:
Not really, because wearing a mask can lower your immune system and covid can be caught like any other virus body contact and body fluids. So since you can still get it through those ways then you're going to get it and be worse off than if you don't wear a mask.
you can test this by not wearing a mask and see how not bad it is catching covid over getting it while you wear a mask.
Explanation:
Answer:
Yes
Explanation:
Hypothesis- if masks are used to protect yourself from Covid-19 then the spread of the virus will decrease
You could test this by:
Getting a mask and using materials such as shampoo, soap, honey, glue, or (safe) chemicals to see how much the masks absorbs the materials. By doing so you can show how the mask can help block certain materials from entering or leaving the mask area therefore slowing the spread of Covid.
The disadvantages of _____ telescopes include chromatic aberration and longer size.
The disadvantages of refractive telescopes include chromatic aberration and longer size.
This was the telescope developed by Newton in 1668.It is the simplest type of telescope which has a tube with lenses on both ends. The light enters through the lens on the farther end of telescope. The light is refracted to a point near the lens on the near end. It is then then further magnified when seen through the lens on the eyepiece.
Even though it was more reliable, it was really heavy and had a larger aperture and longer body. Since high quality lenses were costly to make, cheaper lenses were used mostly. So there was chromatic aberration.
Therefore, the disadvantages of refractive telescopes include chromatic aberration and longer size.
To know more about Telescopes
https://brainly.com/question/556195
#SPJ1
013 10.0 points
Given: The battleship and enemy ships A
and B lie along a straight line. Neglect air
friction.
A battleship simultaneously fires two shells
with the same initial velocity at these two
enemy ships.
battleship
If the shells follow the parabolic trajectories
shown in the figure, which ship gets hit first?
1. both at the same time
2, need more information
3. A
4. B
Ship A with a greater angle of projection will hit the target first.
What is time of flight?
The time of flight is the time a projectile takes to reach maximum height and return to the plane of projection. The time of flight is just double the maximum-height time.
Mathematically, time of flight is given as;
T = (2usinθ)/g
where;
u is the initial velocity of projectionθ is angle of projectionThe time of flight depends on initial velocity of the object and angle of projection.
When the initial velocity of both ships is the same and angle of projection varies, the difference in the time of flight will depend greatly on the angle of projection.
Thus, ship A with a greater angle of projection will hit the target first.
Learn more about time of flight here: https://brainly.com/question/4441382
#SPJ1
. Removing thermal energy from liquid water can cause it to change to what state?
Answer: solid state
Explanation:
The change from the liquid state to the solid state is called freezing. As the liquid cools, it loses thermal energy. As a result, its particles slow down and come closer together. Attractive forces begin to trap particles, and the crystals of a solid begin to form.
A researcher tests acceleration due to gravity by dropping a pebble in an evacuated tube. after 0.5 seconds the pebble falls 1.226 meters. What is the acceleration due to gravity measured by the researcher? SHOW WORK
Answer:
See below
Explanation:
d = 1/2 a t^2
1.226 = 1/2 a (.5)^2
a = 1.226/(1/2 * .5^2)
a = 9.808 m/s^2
A researcher tests acceleration due to gravity then the acceleration due to gravity measured by the researcher is 9.808 m/s².
What is acceleration?In mechanics, acceleration refers to the speed at which an object's velocity varies over time. how many accelerations each vector has. An object's acceleration is determined by the direction of the net force exerted on it.
Due to the fact that it has both a magnitude and a direction, acceleration is a vector quantity. Velocity is a different vector property.
According to the question,
Time, t = 0.5 seconds
Distance, s = 1.226 meters
s = 1/2 a t²
1.226 = 1/2 a (0.5)²
a = 1.226 / (1/2 *0.5²)
a = 9.808 m/s²
So, the acceleration due to gravity is 9.808 m/s².
To get more information about Acceleration :
https://brainly.com/question/3046924
#SPJ5
In the ____ letter style, the date, complimentary close, and signature block are positioned approximately one-half inch to the right of center or at the right margin.
In the Modified Block letter style, the date, complimentary close, and signature block are positioned approximately one-half inch to the right of center or at the right margin.
Following the proper format while writing business letters is crucial. There are specific methods that business letters have to be written.
The modified block letter style, which places one space between the body of the letter and the addresses of the sender and recipient, is one of the several letter kinds. In this form of letter, one space corresponds to around half an inch to the right of centre or at the right margin. Modified block letter formats are largely the same as full-block business letters.
Modified block format is a different extensively used format. The letter body, along with the sender and recipient's addresses, are left justified and single-spaced in this format. On the other hand, tab to the centre and start typing for the date and closure. Semi-Block. Semi-block is the last and least popular type of style.
Learn more about modified block:
https://brainly.com/question/15210922
#SPJ4
An automobile is traveling on a long straight highway at a steady 33.5 m/s when the driver sees a wreck 150m ahead on the side of the road. At that instant, she applies the brakes (ignore reaction time). Between her and the wreck are two different surfaces. First there is 100m of ice, where her deceleration is only 1m/s^2. From then on she is on dry concrete, where her deceleration is a more normal 7m/s^2.
a) What was her speed just after leaving the icy portion of the road?
b) How much total distance does it take her to stop?
c) What is the total time it took her to stop?
I just need b and c!! The answers are given but I can't figure out how to get to them.
Answers given by the WS -
B - 165.9m
C - 7.4s
a) her speed is 26.43m/s
b) Total distance traveled = 100 + 49.89
= 149.89m
c) Total time is 10.846 seconds
What is acceleration?acceleration is the rate of change of the velocity of an object with respect to time.
From the question,
a) The car’s speed just after leaving the icy portion of the road is the first part
We have s = ut + 1/2at²
Here s = 100m, a = 1, u = 33.5 m/s
100 = 0* t + 1/2 * (-1) * t²
t = 7.07 seconds
After 7.07 seconds cars speed is given by v =u +at
u = 33.5m/s, a = -1
velocity = 33.5 + (-1) * 7.07 = 26.43m/s
So velocity of car on leaving icy surface = 26.43m/s
b) Time taken after icy surface
0 = 26. 43 - 7 * t
t = 3.776 seconds
Distance traveled during this time
v² = u² + 2as
0 = (26.43)² + 2 * (-7) * S
s = 49.89 m
Total distance traveled = 100 + 49.89
= 149.89m
c) Total time taken = 3.776 + 7.07
Total time is 10.846 seconds
Learn more about acceleration at: https://brainly.com/question/605631
#SPJ1
You walk in a given direction for 20 m during the first 5 seconds of a trip and then 15 m during the next 2 seconds. your average speed is equal to :________
You walk in a given direction for 20 m during the first 5 seconds, your average speed is equal to 5m/s
How can I figure out average speed?Average speed is determined by dividing the total distance you travelled by the total time, whereas average velocity is determined by dividing your displacement (a vector pointing from your initial position to your end position) by the whole time.
What is the rate of an object’s motion?The amount of something that happens or changes in a unit of time is expressed as a rate.
The equation for speed is that Divide the distance an object travels by the time it takes to cover that distance to determine its speed. A unit of distance is divided by a unit of time in the speed equation.
CalculationThen Average speed = total distance / total time
= 20 + 15 / 5 + 2
= 35/7
= 5 m/s
The average speed is calculated as 5m/s
To know more about average speed, visit:
https://brainly.com/question/12322912
#SPJ4
URGENT!! ILL GIVE BRAINLIEST! AND 100 POINTS
Answer: A. use a thicker piece of wire.
Explanation:
You throw a stone horizontally at a speed of 5.0 m/s from the top of a cliff that is 78.4 m high.
a. How long does it take the stone to reach the bottom of the cliff?
b. How far from the base of the cliff does the stone hit the ground?
c. What are the horizontal and vertical components of the stone’s velocity just before it hits the ground?
a)You throw a stone horizontally at a speed of 5.0 m/s from the top of a cliff that is 78.4 m high.
from above statement we got
height = 78.4 m
since the ball is thrown, so its vertical velocity would be zero
u = 0
taking g = 9.8m/s^2
now, using the equation of motion
h = ut + gt^2/2
now putting all the values in it
we got ,
78.4 = 9.8 * t^2/ 2
by solving we got,
t = 4 sec
b) now, since along the horizontal , no force acting and accelaration is zero so
R = ut , R is RANGE
R = 5 * 4
range = 20 m
c) vertical components of the stone’s velocity just before it hits the ground = v sin θ =
horizontal components of the stone’s velocity just before it hits the ground = v cos θ
To know more about velocity visit :
https://brainly.com/question/18084516
#SPJ9
8. A rock is dropped from a cliff and takes 6 seconds to hit the ground. At what time is the
acceleration of the rock the greatest?
Answer:
A hiker drops a heavy stone over a cliff and hear it strike the cliff base 2.8seconds after dropping it.
1. Initial velocity=0 km/h
Final velocity=24 km/h
Time=3 seconds
2. Initial velocity=0 km/h
Final velocity=35 m/s
Time=5 seconds
3. Initial velocity=20 km/h
Final velocity=60 km/h
Time=10 seconds
4. Initial velocity=50 m/s
Final velocity=150 m/s
Time=5 seconds
What is the acceleration for each problem?
The accelerations for each problem are:
1. 2.22m/[tex]s^{2}[/tex]
2. 7m/[tex]s^{2}[/tex]
3. 1.45m/[tex]s^{2}[/tex]
4. 20m/[tex]s^{2}[/tex]
What is acceleration due to gravity?The acceleration which is gained by the object because of gravitational force is called its acceleration due to gravity. Its SI unit is m/[tex]s^{2}[/tex]. Acceleration due to gravity is a vector, which means it has both magnitude and direction. The acceleration due to gravity at the surface of the Earth is represented by letter g. It has standard value defined as 9.80665 m/s2 (32.1740 ft/s2). However, actual acceleration of a body in free fall varies with location.
1. Initial velocity=0 km/h
Final velocity=24 km/h= 6.66m/s
Time=3 seconds
acceleration =[tex]\frac{6.66-0}{3}[/tex]=2.22m/[tex]s^{2}[/tex]
2. Initial velocity=0 km/h
Final velocity=35 m/s
Time=5 seconds
acceleration = [tex]\frac{35-0}{5}[/tex]=7m/[tex]s^{2}[/tex]
3. Initial velocity=20 km/h=5.55[tex]m/s^{2}[/tex]
Final velocity=60 km/h= 20m/[tex]s^{2}[/tex]
Time=10 seconds
acceleration= [tex]\frac{20-5.55}{10}[/tex]= 1.45m/[tex]s^{2}[/tex]
4. Initial velocity=50 m/s
Final velocity=150 m/s
Time=5 seconds
acceleration= [tex]\frac{150-50}{5}[/tex]= 20m/[tex]s^{2}[/tex]
To know more about acceleration visit: https://brainly.com/question/12550364
#SPJ9
A 25. 0 kg box of textbooks rests on a loading ramp that makes an angle α with the horizontal. The coefficient of kinetic friction is 0. 250, and the coefficient of static friction is 0. 350.
The minimum angle at which the box starts to slip is 20.30°, the acceleration once the box has begun to move is 1.10 m/s2 and final velocity of the box is 3.41 m/s^2.
Given:
Mass of the box m = 25.2 kg
Acceleration due to gravity g = 9.8 m/s^2
Coefficient of kinetic friction between the ramp and box μk=0.25
Coefficient of static friction μs = 0.37
Part(A)
By inctreasing, parallel component of the weight will also increase but the force will decrease.
Let say θ be the angle of repose.
Now we know that
Ff= μs × mg × cosθ = mg × sinθ = Wp
Then we will get
θ = tan−1(μs)
θ = tan-1 (0.37) = 20.30 °
Part(B)
As the box starts sliding the frictional force becomes kinetic friction
The kinetic frictional force
F(k) = μ(k) x mg x cos(20.30)
= 0.25 × 25.2 × 9.8 × cos (20.30)
= 57.91 N
Now calculate the parallel component of the weight
W(p) = mg x sinθ
W(p) = 25.2 x 9.8 x cos (20.30)
= 85.68 N
Now calculate net force
F(net) = W(p) − F(k) = 85.68 − 57.91 = 27.77 N
Acceleration of the box
a = Fn/m = 27.77/25.2 = 1.10 m/s2
Part(C)
The box has moved a distance s = 5.3 m
The final speed of the box = v
Now
v = √ 2as
v = √ 2 x 1.10 x 5.3
v = 3.41 m/s^2
If you need to learn more about acceleration click here
https://brainly.com/question/25749514
#SPJ4
The complete question is
A 25. 0 kg box of textbooks rests on a loading ramp that makes an angle α with the horizontal. The coefficient of kinetic friction is 0. 250, and the coefficient of static friction is 0. 350. Part A) As the angle θ is increased, find the minimum angle at which the box starts to slip. Express your answer using two significant figures. Part B) At this angle, find the acceleration once the box has begun to move. Express your answer using two significant figures. Part C) At this angle, how fast will the box be moving after it has slid a distance 5.3 m along the loading ramp? Express your answer using two significant figures.
What are gears? Gears are wheels Gears are ramps with teeth Gears are wheels with teeth Gears are twisted ramps
A device that regulates how much engine power flows to a machine's moving parts, frequently made of connected sets of wheels with teeth around the edges. Hence, option C is correct.
What is Gear?A gear is a spinning, circular machine element with teeth that can be cut, or in the case of a cogwheel or gearwheel, they can be inserted. These teeth, known as cogs, mesh with another toothed part to transmit (convert) torque and speed. The fundamental idea underlying how gears work is comparable to the fundamental idea behind how levers work. Cog is another casual term for gear. A power source's speed, torque, and direction can all be altered by geared devices.
So, the exact definition of gear is that gears are wheels with teeth.
To get more information about Gear :
https://brainly.com/question/14455728
#SPJ1
Answer:
Gears are wheels with teeth
If the speed doubles, by what factor must the period change if is to remain unchanged?
You have to double the period as well in order to keep it unchanged.
Concept of speedSpeed is calculated as follows: speed = distance * time. Knowing the units for distance and time is necessary to calculate the units for speed.
The units will be in metres per second (m/s) in this example since the distance is measured in metres (m) and the time is measured in seconds (s).
What is the formula for speed?The formula for speed is as straightforward as dividing a distance by a time.
To calculate speed, divide the distance travelled (say, 3 metres) by the passing time (say, 3 seconds) (one metre per second).
So, the rate at which an object’s position changes in any direction can be defined as speed.
The speed formula is as follows: [Speed = Distance]
To know more about speed visit:
https://brainly.com/question/28224010
#SPJ4
1. A vehicle leaves Leeds at 8.00am and
arrives in Newcastle at 10.30am. If the
distance is 140 km, what was the average
speed of the vehicle?
The average speed with which the vehicle travels is equal to 56 Km/hr.
Velocity is measured as a vector quantity. There is a magnitude to it as well as a direction. The magnitude of velocity is measured by speed. The S.I. unit for this is the meter per second. Additionally, there are other units like km/h and km/s. Its dimensional equation is [LT-1].
The average speed of any vehicle is calculated over a given range of time. It is the total distance traveled by the vehicle in the given interval of time divided by the given time interval. It is a scaler quantity.
Average speed= Total Distance/ Time Taken
Given in the question
Distance = 140 km
Time of leaving Leeds = 8.00 am
Time of arriving Newcastle = 10.30 am
Time Taken = Time of arriving Newcastle - Time of leaving Leeds
= 10.30 - 8.00
= 2 hours and 30 minutes
So, the time taken is = 2.5 hr
Put in the values, we get
Average speed= Total Distance/ Time Taken
Average speed= 140/ 2.5 Km/Hr
Average speed= 56 Km/Hr
So, the average speed with which the vehicle travels is equal to 56 Km/hr.
LEARN MORE ABOUT AVERAGE SPEED HERE:
https://brainly.com/question/6504879
#SPJ9