A skateboarder with a mass of 72 kg traveling at 2.8 m/s approaches a hill and rides down it The hill is 17 m high. Assuming a complete transformation of mechanical energy into kinetic energy, what is the skateboarders velocity at the bottom of the hill2

How would doubling the made of an object change the objects potential energy

An electron and a proton have the same kinetic energy upon entering a region of constant magnetic field and their velocity vectors are perpendicular to the magnetic field. suppose the magnetic field is strong enough to allow the particles to circle in the field. note: you'll need to look up the masses for an electron and proton. 1) what is the ratio of the radii of their circular paths rp/re?

Using a wheel and axle, a farmer is trying to lift a bucket of water from the bottom of a well. the larger wheel has a radius of 40 cm compared to the axle that has a radius of 10 cm. if a bucket of water is 50 n, then how much effort is required to raise it? 12.5 n 200 n 2 n 500 n