Is this the answer for the question or is there a question for us?
A heat pump? it might be furnace but i think its heat pump
Answer:
Because the forces acting on the student are creating a net force.
Explanation:
I took the test and that was the answer
I don’t know how air would be an insulator so I’m guessing that one isn’t
Answer:
a) 
Explanation:
a) Let consider that disk accelerates and decelerates at constant rate. The expression for angular acceleration and deceleration are, respectively:
Acceleration

Deceleration

Since angular acceleration and deceleration have same magnitude but opposite sign. Let is find the maximum allowed angular speed from maximum allowed centripetal acceleration:




Maximum magnitude of acceleration/deceleration is:

The least time require for rotation is:

