A 98 N ball is suspended from a cable so that it hangs 3.5 m above the earth. Find the mass of the ball and the gravitational PE of the ball.

How much work is done lifting a 9.10 kg box straight up onto a shelf that is 1.80 m high?

What causes the formation of ocean currents?

Adolphin emits ultrasound at 100khz and uses the timing of reflections to determine the position of objects in the water. part a what is the wavelength of this ultrasound? assume that temperature of water is 20 degrees c. answer in cm