Answer:
The value is 
Explanation:
From the question we are told that
The rate at which the plate rotates is 
Generally the revolution per second is mathematically represented as

=> 
Answer:
DO NO KNOW AND I HOPE YOU CAN FIND IT
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Explanation:
<span>The work output of a machine divided by the work input is the "Efficiency" of the machine.
Hope this helps!</span>
If it starts at rest the initial velocity is 0.
For an acceleration, a, and time, t, the velocity is v=at. Since at t=4, v=7, then a=7/4=1.75m/s^2