Answer:
False
Explanation:
Vector has a magnitude and direction.
A scalar is just a magnitude or size.
The answer is false.
What is scalar and vector quantities?
Scalar quantity:
The scalar quantity will have only the magnitude ( how much or size).These scalar quantity are one dimensional. These can be represented only by calculating the changes in the magnitude. If we need to change the value of scalar we are not able to change because it has no directions to determine the values of the quantity.If we have to perform any kind of mathematical operation, i.e., scalar with scalar we get scalar but when we did the mathematical operation with the scalar and vector then we get the answer is in the vector. some of the scalar quantities are as follows:Speed, Mass, length, distance, power, energy, work.
Vector quantity:
The vector quantity will have both magnitude and direction.The vector quantities are one dimensional, 2 dimensional, else can also be 3 dimensional.Vector quantities can be changed or determined both by the magnitude and direction. If we change the adjacent angles then there changes will occur in the direction.We can perform any kind of mathematical operation.Some of the vector quantities are: Displacement, velocity, acceleration, force, weight, friction, momentum.Hence, Option B is the correct answer.
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what is the volume of the following: *
110
121
120
Answer:
120
Explanation:
10 x 3 = 30
30 x 4 = 120
I hope this helps u! :D
Answer: ayee fanks bro
Explanation:
If you want a charged object to become neutral,then you have to ————-? A.Touch it with a positively charged object B.Touch it with neutral objects C.Touch it with a negativity charged object D.Touch it with the ground
Answer: D.Touch it with the ground
Explanation:
The charged object can become neutral if touched with the ground in a process known as grounding.
If the charged object is negatively charged, excess electrons will flow into the ground thus making the object neutral. If the object is positively charged, electrons will flow from the ground into the object and neutralise it.
High- and low-pressure areas leading to air movement happen when there are differences in which factor?
clouds
density
atmosphere
precipitation
whoever gets the answer will get brainliest!! :D
Answer:
The answer is density
Explanation:
They density of the air is what makes a difference.
two carts are pushed apart by an expanding spring, as shown in the diagram. if the average force on the 1kg cart is 4N, what is the acceleration of each cart
The acceleration of each cart be 4 meter/second².
What is acceleration?Acceleration is rate of change of velocity with time. Due to having both direction and magnitude, it is a vector quantity. Si unit of acceleration is meter/second² (m/s²).
Given parameters:
the average force on the 1kg cart is 4N.
Hence, the acceleration of the 1 kg cart be = force/mass
= 4/1 meter/second²
= 4 meter/second².
As two carts are pushed apart by an expanding spring, the acceleration of the other carts also be 4 meter/second².
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what effect does an unbalanced force have on an object?
Answer:
An unbalanced force can change an object's motion. An unbalanced force acting on a still object could make the object start moving. An unbalanced force acting on a moving object could make the object change direction, change speed, or stop moving.
pls help as fast as you can WILL GIVE BRAINLEIST
Identify 3 specific situations in which machines make work easier and explain why
Answer:
Does the Work for youMore EfficientChanges the Size of ForceHere's why this is correct
According to BrightHubEducation, Machines make work easier by changing the size of force, direction of force, or distance the force acts on. Lifting a car with a flat tire and loosening the lug nuts can be accomplished by a single person thanks to simple machines. The jack and lug wrench are simple machines that alter the force needed to change the tire.
Hope this helps! <3
Pictures below :)
Have a nice day!!
Answer:
17N right
Explanation:
How would you rate your mental health from a scale of 1 (lowest) to 5 (highest) and why?
A 12 kg deer is running with 126 kg•m/s of momentum. What is the deer’s velocity?
Explanation:
HERE,
momentum =126 kg.m/s
weight =12 kg
we know that,
[tex]\tt{ velocity =\dfrac{momentum }{weight} }[/tex]
According to the question,
Deers velocity
=[tex]\tt{\dfrac{126}{12} }[/tex] ⠀
=[tex]\tt{ 10.5 }[/tex] ⠀
Deers velocity is 10.5 m/s.
Some sharks can swim at average cruising speeds of three miles per hour. If a shark swam at that average speed for seven hours, how far would it have traveled?
Answer:
21 miles
Explanation:
3 miles an hour for 7 hours
Its simply 7m*3m/hr=21 miles
which correctly describes how the energy of a wave on the electromagnetic spectrum depends on wavelength and frequency?
Answer:
The answer to this question is given below in this explanation section.
Explanation:
"electromagnetic spectrum depends on wavelength and frequency"
When electromagnetic radiation interacts with single atoms and molecule,its behavior also depends on the amount of energy per quantum(photon)it carries wave number =1/wavelength in cm speed of light=wavelength x frequency energy = Planck's constant x frequency.
Electromagnetic radiation interacts with matter in different parts of the spectrum.
Electromagnetic radiation interacts with matter in different ways in different parts of the spectrum.The types of interaction can be so different that it seems justified to refer to different types of radiation.There is a continuum containing all these different kind of electromagnetic radiation.Thus we refer to spectrum but divide it up based on the different interaction with matter.
Answer:
Energy increases with decreasing wavelength and increasing frequency.
Explanation:
George rides his bike to his friend’s house that is 5 kilometers from his house. If he rides his bike at an average speed of 15 km/h, how long will it take him to get to his friend’s house?
Answer:
It will take George 20 minutes to get to his friends house.
Explanation:
divide 5km by 15km and get a constant of 3
George is riding at 15KM/HR meaning divide the hour by 3
60 minutes by 3 is 20
Missy's favorite ride at the Topsfield Fair is the rotor, which has a radius of 4.0 m. The ride
takes 2.0 s to make one full revolution. a) What is Missy's linear speed on the rotor? b) What is
Missy's centripetal acceleration on the rotor? If her mass is 50-Kg, how is the centripetal force
compare to her weight?
Answer:
a. 12.57 m/s b. 39.5 m/s² c. Her centripetal force is four times her weight.
Explanation:
a. What is Missy's linear speed on the rotor?
Missy's linear speed v = 2πr/T where r = radius = 4.0 m and T = time it takes to complete one revolution = 2.0 s
So, v = 2πr/T
= 2π(4.0 m)/2.0 s
= 4π m/s
= 12.57 m/s
b. What is Missy's centripetal acceleration on the rotor?
Missy's centripetal acceleration, a = v²/r where v = linear velocity = 12.57 m/s and r = radius = 4.0 m
a = v²/r
= (12.57 m/s)²/4.0 m
= 158.01 m²/s² ÷ 4.0 m
= 39.5 m/s²
c. If her mass is 50-Kg, how is the centripetal force compare to her weight?
Her centripetal force F = ma where m = mass = 50 kg and a = centripetal acceleration = 39.5 m/s².
Her weight W = mg where m = mass = 50 kg and g = acceleration due to gravity = 9.8 m/s².
So, comparing her centripetal force to her weight, we have
F/W = ma/mg
= a/g
= 39.5 m/s² ÷ 9.8 m/s²
= 4.03
≅ 4
So her centripetal force is four times her weight.
I NEED HELP ASAP
____________ is the measure of how effectively a force causes rotation.
a. inertia
c. centripetal force
b. torque
d. none of the above
Please select the best answer from the choices provided
A
B
C
D
Answer:
I believe the answer is C
Explanation:
because centripetal force is generally assosiated with rotation and how fast something spins
Torque is the measure of how effectively a force causes rotation because centripetal force is generally assosiated with rotation and how fast something spins.
What is torque?Torque is a pattern of the force that can make a victim to revolve on an axis. The torque's direction vector based on the force's direction on the axis.
The SI unit of torque is the Newton-meter. The Torque can be both static or dynamic.
A static is one that does not generate an angular acceleration.
The Torque's magnitude vector ζ for a torque generated by a given force F is;
ζ = F .r sin(θ)
where,
r is the width of the moment arm
θ is the angle within the force vector and the moment arm.
In rotational kinematics, torque is measured as;
ζ = Iα
Where,
α is the angular acceleration
I is the rotational inertia
therefore, Torque is the measure of how effectively a force causes rotation because centripetal force is generally assosiated with rotation and how fast something spins.
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A car accelerates uniformly from rest and
reaches a speed of 9.2 m/s in 9.7 s. The
diameter of a tire is 47.8 cm.
Find the number of revolutions the tire
makes during this motion, assuming no slip-
ping
Answer in units of rev.
Answer:
29.75 revolutions
Explanation:
The kinematic formula for distance, given a uniform acceleration a and an initial velocity v₀, is
[tex]d=v_0t+\frac{1}{2}at^2[/tex]
This car is starting from rest, so v₀ = 0 m/s. Additionally, we have a = 9.2/9.7 m/s² and t = 9.7 s. Plugging these values into our equation:
[tex]d=0t+\frac{1}{2}\left(\frac{9.2}{9.7}\right)(9.7)^2\\d=\frac{1}{2}(9.2)(9.7)\\d=4.6(9.7)\\d=44.62[/tex]
So, the car has travelled 44.62 m in 9.7 seconds - we want to know how many of the tire's circumferences fit into that distance, so we'll first have to calculate that circumference. The formula for the circumference of a circle given its diameter is [tex]c=\pi{d}[/tex], which in this case is 47.8π cm, or, using π ≈ 3.14, 47.8(3.14) = 150.092 cm.
Before we divide the distance travelled by the circumference, we need to make sure we're using the same units. 1 m = 100 cm, so 105.092 cm ≈ 1.5 m. Dividing 44.62 m by this value, we find the number of revs is
[tex]44.62/1.5\approx29.75[/tex] revolutions
HELP PLSSS
A 13.3 kg box sliding across the ground
decelerates at 2.42 m/s2. What is the
coefficient of kinetic friction?
(No unit)
ps( its not 0.242)
Given :
A 13.3 kg box sliding across the ground decelerates at 2.42 m/s².
To Find :
The coefficient of kinetic friction.
Solution :
Frictional force applied to the box is :
[tex]f = ma[/tex] ....1)
Also, force of friction is given by :
[tex]f = \mu mg[/tex] ....2)
Equating equation 1) and 2), we get :
[tex]\mu mg = ma\\\\\mu = \dfrac{a}{g}\\\\\mu = \dfrac{2.42}{9.8}\\\\\mu = 0.247[/tex]
Therefore, the coefficient of kinetic friction is 0.247 .
Sonny Toomey 16 seconds to finish a 100-m race. What was Sonny's average speed in the race? Give your answer in the decimal form.
Answer:
6.25 m/s.
Explanation:
Total distance travelled = 100 m
Total time = 16 s
Average speed =?
Average speed is simply defined as the ratio of total distance travelled to the total time taken to cover the distance. Mathematically, it is expressed as:
Average speed = total distance / total time
With the above formula, we can obtain the average speed of Sonny Toomey as illustrated below:
Total distance travelled = 100 m
Total time = 16 s
Average speed =?
Average speed = total distance / total time
Average speed = 100 / 16
Average speed = 6.25 m/s
Therefore, the average speed of Sonny Toomey is 6.25 m/s
Need 100 IQ and more
A food package is dropped from a helicopter flying horizontally at a height of 125m. If the magnitude of the velocity of the packageafter 2seconds is 25m/s. Find
a. The speed of the helicopter at the moment the package is dropped.
b. The position of the package after 2s.
c. The time of flight of the food package
d. The horizontal distance covered.
Answer:
a. The speed of the helicopter at the moment the package is dropped is approximately 15.519 m/s
b. The position of the package 2s after it is dropped is (31.038 m, -9.8 m)
c. The time of flight of the food package is approximately 5.105 seconds
d. The horizontal distance covered is approximately 79.22 m
Explanation:
The given parameters are;
The height at which the helicopter is flying = 125 m
The magnitude of the velocity of the package after 2 seconds, v = 25 m/s
a. The vertical velocity of the package, [tex]v_y[/tex], is given as follows;
[tex]v_y[/tex] = [tex]u_y[/tex] + g·t
Where;
[tex]u_y[/tex] = 0 m/s for the dropped food package
t = The duration of the package in the air = 2 s
g = The acceleration due to gravity = 9.8 m/s²
Therefore;
[tex]v_y[/tex] = g·t = 9.8 m/s² × 2 s = 19.6 m/s
We have, [tex]v = \sqrt{v_x^2 + v_y^2}[/tex],
Where;
vₓ = The horizontal velocity of the food package = The horizontal speed of the helicopter
therefore, [tex]v_x = \sqrt{v^2 - v_y^2}[/tex], which gives;
[tex]v_x = \sqrt{v^2 - v_y^2} = \sqrt{25^2 - 19.6^2} \approx 15.519 \ m/s[/tex]
The speed of the helicopter at the moment the package is dropped ≈ 15.519 m/s
b. The vertical if the package after 2 s is given as follows;
The vertical position of the package after 2 s is given by the kinematic equation, h = 1/2·g·t² = 1/2 × 9.8 m/s² × 2 s = 9.8 m
The food package is located 9.8 m vertically below the point where it is dropped
The horizontal position, x, of the package after 2 s is given by the following kinematic equation, x = vₓ × t
Therefore, x = 15.519 m/s × 2 s ≈ 31.038 m
The coordinates of the location of the package 2 seconds after it is dropped is (31.038 m, 9.8 m)
c. The time of flight, [tex]t_{tot}[/tex], of the food package which is the time it takes the package to reach the ground from 125 m, is given as follows;
[tex]t_{tot} = \sqrt{\dfrac{2 \cdot h}{g} } = \sqrt{\dfrac{2 \times 125 \ m}{9.8 \ m/s^2} } \approx 5.051 \ seconds[/tex]
The time of flight of the food package, [tex]t_{125}[/tex] ≈ 5.105 seconds
d. The horizontal distance covered, [tex]x_{tot}[/tex] = vₓ × [tex]t_{tot}[/tex] ≈ 15.519 m/s × 5.105 s = 79.224495 m ≈ 79.22 m.
if you divide velocity by time what unit do you get
Answer:
m/s^2, acceleration
Explanation:
velocity in SI units is meter / second
dividing by time(second) gives meter / second^2 which is acceleration.
Describe how radio waves are different from sound waves
Answer:radio waves are electromagnetic waves propagating in any non-conductive media by varying the field at each point in it. Sound is a wave of pressure changes of the medium such as air. Radio waves are a combination of electric and magnetic fields that need no medium to travel upon.
Explanation:please give brainliest
Radio waves are longest electromagnetic waves whereas sound waves are mechanical waves. Sound waves can move only through a medium and electromagnetic waves does not need a medium to travel.
What is radio waves ?Radio waves are a kind of electromagnetic waves. In the electromagnetic spectrum, radio waves has the longest wavelength and smallest frequency. Thus, radio waves have lower energy in comparison to other electromagnetic waves.
Sound waves are mechanical waves. Mechanical waves needs a medium to travel where as electromagnetic waves does not need a medium and they can moves through vacuum.
Sound waves are longitudinal mechanical waves where, the oscillation of particles is in the direction along the wave propagation. Electromagnetic waves are more energetic and faster than sound waves.
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calculate the density of gold if 96500kg mass of gold is adjusted in the volume of 5m cube
Answer:
96500÷5=19300
Explanation:
96500÷5=19300
Please help I’m begging I have to get this in by tonight
Answer:
Divide Whole Numbers by Fraction Worksheet
To divide fractions, you need to invert the divisor and multiply. To invert a fraction, reverse the numerator and denominator. The special name given to an inverted fraction is reciprocal. Recall that a whole number has a understood denominator of 1.
What is the relationship between Newton's first law of motion and inertia?
Explanation: Newton's first law of motion states that a body at rest remains at rest, or, if in motion, remains in motion at a constant velocity unless acted on by a net external force. This is also known as the law of inertia. Inertia is the tendency of an object to remain at rest or remain in motion.
Fill in the blank..
The moon takes _______ to revolve around the Earth.
ANSWER CHOICES:
A. 27 days
B. About a month
Answer:
The moon takes 27 days to revolve around the earth.
Explanation:
I hope this helps :)
The moon takes 27 days to revolve around the Earth.
a bicycle wheel with a radius of 0.31 m rotates with an angular speed of 21 rad/s about its axle, which is at rest. What is the linear speed of a point on the rim of the wheel
Answer:
The linear speed is 6.51 m/s
Explanation:
Uniform Circular Motion
It's a movement of an object along the circumference of a circle. It can also be defined as a rotation along a circular path.
The angular speed can be calculated as follows:
[tex]\displaystyle \omega=\frac{v}{r}[/tex]
Where:
v = tangential or linear speed
r = radius of the circle described by the rotating object
To calculate the linear speed, solve for v:
[tex]v = \omega\cdot r[/tex]
[tex]v = 21\ rad/s\cdot 0.31\ m[/tex]
[tex]v = 6.51\ m/s[/tex]
The linear speed is 6.51 m/s
5.How far must a 5 N force pull a 50 g toy car if 30 J of energy are transferred?
Answer:
5 meters
Explanation:
Step one:
given data
mass of the toy car= 50g
Work done= 30J
Force applied F= 5N
Required
The distance moved
Step two:
The expression for the work done is given as
WD= force * distance
substitute
30= 5*d
divide both sides by 5
d=30/5
d= 5m
The distance moved is 5 meters
An object of mass 8 kg Is attached to a massless string of length 2 m And Suong With a tangentialVelocity of 3 m/s what isThe tension in the string
Answer:
36 N
Explanation:
The tension on the string :
T =mv²/r ------where
m= mass of object = 8 kg
v= tangential velocity = 3 m/s
r= length of the string = 2m
T= [ 8 * 3² ] / 2
T= 36 N
Which one is NOT an application of heating effect of electric current ? * Required to answer. Single choice.(1 Point) Electric bulb Electromagnet Electric water heater
Answer:
Electromagnet.
Explanation:
Electric bulb and electric water heather are application of heating effect of electric current. The electromagnet is not the result of heating effect of electric current. The bulb gives light due to the heating effect similarly the water is heated or warmed by the heating effect of electric current.
PLEASE The weight of a girl is 600 N and the area of her one foot is 50 cm². What will be the pressure exerted by her on theground?
Answer:
pressure=force/area
p=600/50
p=12
so 12Nm^-1
intensity of light in SI system
Answer: candela
Explanation:
The SI unit for the measurement of intensity is referred to as the candela. The candela is simply used in the measurement of the visual intensity with regards to light sources such as the bulb we have in torches or the light bulbs that we have in our various homes. It is the power that a light source emits in a certain direction.