Assuming that the entirety of the force is opposite the static friction, then the couch should begin sliding as the applied force overcomes the couch's static friction with what it's making contact with.
Answer:
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Explanation:
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No, light does not have mass because a photon does not way anything.
Answer:
Part a)

Part b)
v = 3.64 m/s
Part c)

Part d)

Explanation:
As we know that moment of inertia of hollow sphere is given as

here we know that

R = 0.200 m
now we have


now we know that total Kinetic energy is given as





Part a)
Now initial rotational kinetic energy is given as



Part b)
speed of the sphere is given as
v = 3.64 m/s
Part c)
By energy conservation of the rolling sphere we can say




Part d)
Now we know that




Answer:
Acceleration will be 
So option (D) will be correct answer
Explanation:
We have given angular speed of the electrical motor 
We have to change this angular speed in rad/sec for further calculation
So 
Armature radius is given r = 7.165 cm = 0.07165 m
We have to find the acceleration of edge of motor
Acceleration is given by 
So acceleration will be 
So option (D) will be correct answer