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A 30 kg boy sits at a distance of 2 m from the center of a see-saw. What mass is his sister if she sits at the 1.5 meter mark to balance him?

A coin and a ring of the same mass and diameter roll down an incline starting at the same time. The one to reach the bottom first will be the

How much time would it take a 60 Watt light bulb to consume 300 Joules of energy?

Which has a greater kinetic energy, a 5 kg mass traveling at 30 m/s or a 2.5 kg mass traveling at 60m/s?

My sister at a height of 25 m has a potential energy of 22,500 Joules. What is her mass?

The mass of a lamb that weights 110 N is about

A car traveling at 100 km/hr strikes an unfortunate bug and splatters it. The force of impact is greater on the

A 10 kg brick and a 1 kg book are dropped in a vacuum. The force of gravity on the 10 kg brick is

A person is attracted toward the center of the earth by a 500 N gravitational force. The force of attraction of the earth toward the person is

A bullet is fired horizontally with an initial velocity of 300 m/s from a tower that is 20 m high. If air resistance is negligible, the horizontal distance the bullet travels before hitting the ground is