A copper rod with a mass of 0.220 kg slides on parallel horizontal iron rails, 0.560 m apart, and carries a current of 15.0 A. The coefficient of friction between the rod and rails is 0.290. What vertical, uniform magnetic field is needed to keep the rod moving at a constant speed? (Enter the magnitude in mT.) mT

A spring has a natural length of 4 m. If a 32-N force is required to keep it stretched to a length of 6 m, how much work W is required to stretch it from 4 m to 12 m? (Round your answer to two decimal places.)

How much power does it require to raise a car with mass of 1890kg at the rate of 45 meter per minute? In (W).

By definition, when is mechanical work done?

How does an arrow shoot from a bow get energy?

What is the work done pushing a box 3 m with a constant force of 100 N? What if the box moves 6 m?

You lift a 2N rock by 4 m, in 2 seconds. How much work did you do? 8 J 6 J O 12 J O 16 J

Show that 24 J of work is done when a 3.0-kg block of ice is moved from rest to a speed of 4.0 m/s.