Answer:
workdone = force × distanceExplanation:
let's find the acceleration
[tex]v = u + at \\ 8 = 0 \times a \times 2.5 \\ \alpha = 3.2m {s}^{ - 2} [/tex]
then distance
[tex] {v}^{2} = {u}^{2} + 2as \\ {8}^{2} = 2 \times 3.2 \times s \\ \\ s = 10m [/tex]
w = f ×d = 20 × 10 = 200JWhich planet in our solar system is considered the most thoroughly studied?
1. Mars
2. Pluto
3. Venus
4. Jupiter
What year was soccer added to the Olympic games ?
a - 1996
b - 1904
c - 1900
Answer:
a - 1996
Explanation:
Answer:
1900
Explanation:
It's football but for the U.S terms, they call it Soccer, and it was in 1900
What is the main function of the mitochondria in a cell?
Answer:
Below :)
Explanation:
It is the powerhouse of the cell and creates chemical energy.
12.Two masses are arranged as shown on a ramp that makes an angle of 36° with the horizontal. Mass m1 is twice mass m2
. What is the minimum coefficient of static friction required between mass m1 and the ramp to ensure equilibrium?
Force M2 exerts on tension T
T = M2 g
T = M1 g sin theta - M1 g u cos theta
Note that M1 g is exerted down the plane while the frictional force opposes this motion and will be directed in the opposite direction of M1 g
M2 g = M1 g sin theta - u M1 g cos theta
1 = 2 sin 36 - u 2 cos 36
.5 = sin 36 - u cos 36
u = (sin 36 - .5) / cos 36 = .108
Any friction less that this will result in sliding
"1.7456" would be the minimum coefficient of static friction required.
Given:
Angle,
[tex]\Theta = 30^{\circ}[/tex]Mass,
[tex]m_2 =2 m_1[/tex]To keep the system in equilibrium forces acting on mass "[tex]m_1[/tex]" must balance forces acting on "[tex]m_2[/tex]".
That's,
→ [tex]Forces \ on \ m_1 \ downward \ along \ ramp = Forces \ on \ m_2 \ downwards[/tex]
or,
→ [tex]m_1 g Sin \Theta + \mu_s m_1 g Cos \Theta =m_2 g[/tex]
Thus,
→ [tex]\mu_s = \frac{m_2 g - m_1 g Sin \Theta}{m_1 g Cos \Theta}[/tex]
[tex]= \frac{m_2-m_1 Sin \ 36^{\circ}}{m_1 Cos \Theta}[/tex]
hence,
→ [tex]\mu_s = \frac{2 m_1 - m_1 Sin \ 36^{\circ}}{m_1 Cos \ 36^{\circ}}[/tex]
[tex]= 1.7456[/tex]
Thus the above answer is right.
Learn more:
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A man pushes a 49 kg mower with a force of 650 N at a downward angle of 35° as shown in the picture to the right. If the mower experiences a frictional force of 493.249 N, find:
The acceleration of the mower.
The normal force acting on the mower.
Answer:
a = 0.8m/s^2
F = 39.28 N
Explanation:
Sum of forces in X direction = 650cos(35)N-493.249N
Sum of forces in X direction= 39.28 N
F = m*a
a = F/m
a = 39.28N/49kg
a = 0.8 m/s^2
Determine the acceleration of the block
if the coefficient of static friction is 0.343.
Answer:
a = 1.49m/s²
Explanation:
Find the diagram attached
According to Newton's second law of motion
\sum Fx = ma
Fm - Ff = ma
Fm is the moving force
Ff is the frictional force
Fm = Wsin theta
Ff = μR = μWcos theta
Wsin theta - μWcos theta = ma
W is the weight = 50.1 * 9.8 = 490.98N
theta is the angle of inclination = 27.2°
μ is the coefficient of friction = 0.343
m is the mass = 50.1kg
a is the acceleration
Substitute into the formula as shown;
Wsin theta - μWcos theta = ma
490.98sin27.2° - 0.343(490.98)cos 27.2° = 50.1a
224.423 - 149.78 = 50.1a
74.64 = 50.1a
a = 74.64/50.1
a = 1.49m/s²
Hence the acceleration of the block is a = 1.49m/s²
write the terms involved in s=ut+1\2
s = displacement; u = initial velocity; t = time of motion
A dog sled was moving to the right on an icy surface with low friction, when the connecting rope between the sled and the dogs broke. What happens to the motion of the sled? *
Answer:
The sled will slow down in speed
Explanation:
According to Newton's first law of motion, a body will continue to be at rest or uniform motion unless acted upon by an external force.
In this situation, once the connecting rope between the sled and the dogs breaks, the motion of the sled will reduce because it is no longer connected to the dog that is providing the motion, hence the source of motion is no longer connected to the sled
On Earth, friction can be _____ but not removed.
Answer:
reduced
Explanation:
The use of bearing surfaces that are themselves sacrificial, such as low shear materials, of which lead/copper journal bearings are an example
a sealed bottle of water was taken from a refrigerator and left in a warm kitchen. explain in the terms of its molecules what happened to the thermal energy and temperature of the water in a few minutes
Answer:
Explanation:
The sealed bottle serves as an open system for the water molecules, thus heat energy can be exchanged with its surroundings. When the bottle is placed in a warm environment, there would be a gradual increase in the thermal energy of the molecules of water due to a change in the temperature of its surroundings.
Thus, the molecules of water closer to the boundary of the bottle absorbs heat, becomes lighter and changes position. This gradual process continues until all molecules attains an average temperature which equals that of the surroundings of the bottle.
Therefore, both the thermal energy and temperature of the water increases.
At which position would a cat on Earth have least amount of pull due to gravity?
in a cat bed on the ground
on a second floor window sill
in a plane flying above Earth
Answer:
in a plane flying above Earth
Explanation:
Gravity is the force that draws objects toward center of the earth. If you throw an object up on the earth's surface, you will notice that it will fall back to the ground due to the earth's gravitational pull on the object.
However, the further one goes from the earth's surface, the lesser the gravitational pull. Therefore the cat will experience less gravitational pull in an airplane flying at a higher altitude.
About 50,000 years ago, in an area located outside Flagstaff, Arizona, a giant 4.5 107-kg meteor fell and struck Earth, leaving a 180-m-deep hole now known as Barringer crater. If the meteor was traveling at 20,000 m/s upon impact, with what average force did the meteor hit the earth?
Answer:
[tex]F_A =5.625*10^1^6N[/tex]
Explanation:
From the question we are told that
50,000 years ago,
A giant 4.5 107-kg meteor
180-m-deep hole
20,000 m/s
Generally for this problem the energy change is given as
[tex]\triangle E=\frac{1}{2} mv^2 +mgd[/tex]
Having the potential and kinetic energy in place
Mathematically solving for Average force[tex]F_A[/tex]
[tex]\triangle E=F_a*d[/tex]
[tex]F_A =\frac{1/2* 4.5*10^7(20,000)^2-kg+4.5*10^7*9.81*160}{160}[/tex]
Therefore Average force [tex]F_A[/tex] is given by
[tex]F_A =5.625*10^1^6N[/tex]
Which of the following is an example of Kinetic to Electrical energy
conversion?
A. Toaster
B. Bicycle
C. Ceiling fan
D. Generator
Godric and Savos are a few meters apart, at one end of the football field. Peter is at the other end of the field. Godric and Savos starts moving towards Peter at a speed of 4m/s. From Savos point of view how is Godric moving?
Answer:
From Savos point of view, Gadros appear not to be moving
Explanation:
The given parameters are;
The distance between Godric and Savos = A few meters
The location of Godric and Savos = One end of the field
The location pf Peter = The other end pf the field
The speed with which Godric and Savos are moving towards Peter = 4 m/s
Let the positive x-direction be the direction in which Godric and Savos are moving
Therefore;
The speed and direction with which Godric is moving = The speed and direction with which Savos is moving = 4·i m/s
From Savos point of view, the relative speed with which Godric is moving = (The speed and direction in which Godric is moving) - (The speed and direction in which Savos is moving) = 4·i m/s - 4·i m/s = 0 m/s
Therefore, from Savos point of view, the relative speed with which Godric is moving = 0 m/s or Gadros appears stationary or not to moving.
What direction does tangential velocity point?
inward
outward in a straight line tangent to the circle
around the circle
Answer:b.outward in a straight line tangent to the circle!
Explanation:at any given point on the circle is always along the tangent line.
1. Ex. Weight lifted above your head, piston in an engine
(1 Point)
Mechanical Energy
Nuclear Energy
Sound Energy
Chemical Energy
Answer:
I think it is mechanical energy
help please I have to turn this in tonight!!
An atom has an equal number of neutrons and electrons. True or false
Answer:
True
Explanation:
i searched it up and well this thing is making me do it up till 20 characters long so yea
To boil water it requires heat , what happens to the heat when the water cools down as energy can neither be destroyed nor be created ?
Answer:
Explanation:
The water particles just flow through each other. They cannot be destroyed nor created.
Answer:
The water cooling down is due to evaporation, the heat is simply changing the state of matter of the water. Energy is being used to change it's state. Evaporation causes the cooling down of something. Think of sweat?
Explanation:
A car covers 100 km in 2 h , what is the speed of the car. I want full answer
Answer:
Distance = 100kmTime = 2hoursSpeed = Distance/Time = 100km 2hrSpeed= 50km/ hrI hope it helps ❤❤How many DAYS occur between a new moon and a first quarter moon?
Answer:
About 29.5
Explanation:
Answer:
7 days or a week
Explanation:
An object is place 30.5 cm from a convex lens that has a focal length of 8.0cm.where is the image ?
Answer:
Image is between F and 2F. And the exact location is:
q = 10.84 cm
Explanation:
The convex lens form different kinds of images with different sizes and locations, for the different positions of an object. In this case, the object is placed 30.5 cm from the convex lens with a focal length of 8 cm. This means that it is the case of the object placed beyond 2F. In this case, the image formed has the following characteristics:
1. Image is real.
2. Image is inverted
3. Image is diminished
4. Image is located between F and 2F
For exact location we use the thin lens formula:
[tex]\frac{1}{f} = \frac{1}{p} + \frac{1}{q}[/tex]
where,
f = focal length = 8 cm
p = object distance = 30.5 cm
q = image distance = ?
Therefore,
[tex]\frac{1}{8\ cm} = \frac{1}{30.5\ cm} + \frac{1}{q} \\\frac{1}{8\ cm} - \frac{1}{30.5\ cm} = \frac{1}{q}[/tex]
q = 10.84 cm
Why cloth and leather are used to make safety clothing for people who work with heat. A.they are both good sources of heat. B they both can produce electrical energy C they both can absorb light energy. D they are both poor conductors of heat
Answer: D
Explanation:
Which of these is one of six most common elements found in the human body??
Answer: Oxygen
Explanation: Oxygen is the most common element in the human body. It makes up 65% of the body.
If the air pressure measures is 3 atm. How many mb of pressure is in the air?
Answer:
3
Explanation:
If there is 3 at the moment (atm) is the same as might be (mb) in the air.
PLEASE HELP Due Today!
When the motion energy of an object changes, energy is being transferred. How do you know that's true?
Answer: The statement when the motion energy of an object changes, energy is being transferred is true.
Explanation:
Motion energy is also called mechanical energy and it is the summation of kinetic energy and potential energy stored in an object required for work.
As kinetic energy is the energy acquired due to motion of an object and potential energy is the energy acquired by an object due to its position.
For example, when a moving ball strikes another ball causing it to move then energy is being transferred from one ball to another.
Therefore, the statement when the motion energy of an object changes, energy is being transferred is true.
The average diameter of an atom is ________
(a) 10“8 m
(b) 1 m
(c) 1A°
(d) 10
Answer
0.1 - 0.5 nano meters
Explanation:
Here ya go buddy! :D
A coastline on Earth experiences tides according to the graph below.
A graph showing a high tide at approximately 12 hours and 24 hours with a low tide occurring 6 hours before each high tide.
What type of tide is cycling in this location?
AWNSER CHOICES:
A: Diurnal tides
B: Mixed dinural tides
C: Mixed semidiurnal tides
D: Semidiurnal tides
If I can figure out how to mark brainliest I will if the awnser provided is correct
Answer:
Most coastal areas, with some exceptions, experience two high tides and two low tides every lunar day (Ross, D.A., 1995). Almost everyone is familiar with the concept of a 24-hour solar day, which is the time that it takes for a specific site on the Earth to rotate from an exact point under the sun to the same point under the sun. Similarly, a lunar day is the time it takes for a specific site on the Earth to rotate from an exact point under the moon to the same point under the moon. Unlike a solar day, however, a lunar day is 24 hours and 50 minutes. The lunar day is 50 minutes longer than a solar day because the moon revolves around the Earth in the same direction that the Earth rotates around its axis. So, it takes the Earth an extra 50 minutes to “catch up” to the moon (Sumich, J.L., 1996; Thurman, H.V., 1994).
the answer is C
Mixed semidiurnal tides is the type of wave that coastline on Earth experiences.
What is meant by Mixed semidiurnal tides?An area has a mixed semidiurnal tidal cycle if it experiences two high and two low tides of different size every lunar day. Some areas, such as the Gulf of Mexico, have only one high and one low tide each day.Many areas on the western coast of North America experience these tidal cycles.Mixed semidiurnal tides is the type of wave that coastline on Earth experiences.
To learn more about Mixed semidiurnal tides refer:https://brainly.com/question/14681092
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Someone please help me I’m begging you
[tex] \large{ \text{Hii, Hope \: you \: are \: fine!}}[/tex]
4321 is the answer
Why is it important for cornea of the eye to be transparent?
Answer:
More than 60% of the total refractive power of the eye is attributed to the cornea making it vital to focusing light onto the retina for visual processing 115.
Explanation:
For optimal vision, the cornea must efficiently transmit incident light by maintaining its transparency.
14. The design for a rotating spacecraft below consists of two rings. The outer ring with a radius of 30 m holds the living quarters and mimics the surface gravity of Earth, approximately 9.80 m/s'. The inner ring is designed to help the astronauts become accustom to the surface gravity of a new planet: 5.35 m/s. Calculate the spacecraft's period of rotation for the outer ring.
Answer:
[tex]T= 11.0003[/tex]s
Explanation:
From the question we are told that
The outer ring with a radius of 30 m
inner Gravity Approximately 9.80 m/s'
Outer Gravity Approximately 5.35 m/s.
Generally the equation for centripetal force is given mathematically as
Centripetal acceleration enables Rotation therefore?
[tex]\omega ^2 r =Angular\ acc[/tex]
Considering the outer ring,
[tex]\omega ^2 r = 9.8[/tex]
[tex]\omega ^2= \frac{9.8}{30}[/tex]
[tex]\omega = \sqrt{\frac{9.8}{30}}[/tex]
[tex]\omega= 0.571 rad/s[/tex]
Therefore solving for Period T
Generally the equation for solving Period T is mathematically given as
[tex]T= \frac{2\pi}{\omega}[/tex]
[tex]T= \frac{2\pi}{0.571 rad/s}[/tex]
[tex]T= 11.0003[/tex]s