It takes 23 seconds to hoist a rescue diver of mass 80 kg from the ocean surface to a helicopter hovering 23.9 meters above the ocean surface using a motor-driven cable. How much power (in Watts) was supplied by the motor to hoist the diver into the helicopter at a constant speed

While goofing off at the ice skating rink, a student takes off her shoes and places each of them on the ice. her friend, a hockey player, then shoots a hockey puck at each shoe. the first puck immediately comes to rest after it collides with the left shoe. the second puck rebounds after it collides with the right shoe. if each hockey puck has the same incoming speed, which shoe has greater speed after the collision? the right shoe. both shoes have the same speed. the left shoe.

What property of an object determines its inertia?

In a classical model of the hydrogen atom, the electron moves around the proton in a circular orbit of radius 0.053 nm. what is the electron's orbital frequency? what is the effective current of the electron?