Answer:
b
Explanation:
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Answer:
Divide the change in velocity by the time interval
Explanation:
Acceleration is defined as the rate of change of velocity.
mathematically it is the change in velocity divided by the time taken for that change.
i.e Divide the change in velocity by the time interval.
Answer:
Explanation:
The man is moving on a circular path . The reaction of wall is providing centripetal force .so
R = mv² / r
Frictional force = μR where μ is coefficient of friction
= μ x mv² / r
Frictional force = μ x mv² / r
Answer:
43,555 W
Explanation:
Since the speed is constant, this means that the force applied to lift the equipment is equal to the weight of the equipment. So we can write:

where
m = 1000 kg is the mass
is the acceleration due to gravity
So,

Then the work done in lifting the equipment is:

where
d = 200 m is the displacement of the equpment
Substituting,

Finally, the power used to lift the equipment is the ratio between the work done and time taken:

where

t = 45 s is the time taken
Solving,
