A 50kg hiker is standing on the edge of a cliff. Find the hiker's gravitational potential energy if the cliff is 30m high. (Show the equation, show your work and answer with units.)

An early submersible craft for deep-sea exploration was raised and lowered by a cable from a ship. When the craft was stationary, the tension in the cable was 7500 N.

How is a full moon different from a new moon?

Technician A says that when a fuse has popped, it just needs to be replaced, since it performed its job. Technician B says that when a fuse has blown, the circuit needs to be diagnosed because the fuse was probably not the problem. Who is correct? A.

Brass is an alloy of copper and zinc the two metals are melted mixed and then solidified how would you best classify brass

During which changes of state do atoms that cannot move past one another become free to move

Two football players collide on the field. Before the collision, their total momentum was 450 kgm/s to the north. What is their total momentum after the collision? A. More than 450 kgm/s north B. 450 kgm/s north C. Less than 450 kgm/s north D.

Jane and John Doppler effect

If you combine 430.0 ml of water at 25.00 °c and 140.0 ml of water at 95.00 °c, what is the final temperature of the mixture? use 1.00 g/ml as the density of water. s

While working out, a man performed 200 j of work in 3 seconds. What was his power?

A funnel-shaped low pressure closure