A crane lifts a piano weighing 9,000 N to the roof of a 7-story building. The height of each floor (story) of the building is 3 m. How much work is done by the crane?

Atrain departs from its station at a constant acceleration of 5 m/s. what is the speed of the train at the end of 20s?

Africtionless piston-cylinder contains 50 l of saturated liquid r-134a. the piston has a mass and an area resulting in an applied pressure of 500 kpa on the refrigerant. the refrigerant is now heated until its temperature rises to 70∘c. calculate the work (in kj) done during this process.

A2k pendulum has a speed of 1 m/s at a height of 1/2 meter