How can you make work output of a machine greater than the work input?

What is the specific heat of a substance if 130 kj of heat is needed to raise 6.6 kg of the substance from 18.0 ∘c to 37.2 ∘c?

What linear speed must an earth satellite have to be in a circular orbit at an altitude of 159 km?

How much heat per second h (=qÎ't) flows from the boiling water to the ice-water mixture? express your answer in watts?

T = mg + ma solve for a

A box of books with mass 43 kgkg rests on the level floor of the campus bookstore. The floor is freshly waxed and has negligible friction. A bookstore worker applies a constant horizontal force with magnitude 25 NN to the box.

A car travels along eastward with a constant velocity. the magnitude of the acceleration of the car is

What is the weight of a 65 kg astronaut on mars?

When lava cools, what type of Rock forms?

A uniformly charged conducting sphere of 1.1 m diameter has a surface charge density of 6.2 µC/m2. (a) Find the net charge on the sphere. (b) What is the total electric flux leaving the surface of the sphere?

A blow-dryer and a vacuum cleaner each operate with a voltage of 120 V. The current rating of the blow-dryer is 12 A, while that of the vacuum cleaner is 5.7 A. Determine the power consumed by (a) the blow-dryer and (b) the vacuum cleaner.