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Which will stay cooler in sunlight?

If you rub a balloon on your head stripping electrons off your hair, your hair becomes

I spin my son on the merry-go-round at the playground. When he walks inward towards the center of the merry-go-round, the rotational inertia of the system will_____.

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