Answer:
The average power is 15.26 W.
Explanation:
Given that,
Force = 29 N
Radius = 0.27 m
Time = 1.9 s
We need to calculate the power
Using formula of power



Here, 
Where, F = force
t = time
r = radius
Put the value into the formula


Hence, The average power is 15.26 W.
Answer:
The force in question is friction. There is also friction between the ground and part of the ball that touches the ground as it rolls. The friction force acts in the opposite direction to the motion of the ball, slowing it and eventually stopping it.
Explanation:
The refractive index is used to measure how much light bends as it goes from one medium to another the refractive index of air =1 as light doesn’t bend in it
When looking into a glass of water with a straw the straw may appear bent or morphed as the water has a different refractive index to air (and the light is passing from air to glass of water)
Answer:
A
Explanation:
Energy is stored inside the batteries. Thus it is chemical potential energy