a golf ball of mass 50g travels at 70 m/s hits a persons head (stopping in 0.05 second), what is the impact force

Whose atomic theory explains how atoms emit and absorb light

Explain why sound energy is not a type of potential energy

If a creature cats Ferrari, with an initial speed of 10 m/s, accelerate at a rate of 50 m/s/s for 3 seconds, what will it's final speed be?

Nick pulls into a gas station and fills up his tank. He then starts his car, turns on his headlights, and drives away. Beginning with the gasoline, list and explain the energy conversions taking place as he drives away.

What happens to the resistance of a wire as it gets wet

A block of mass 1.3 kg is resting at the base of a frictionless ramp. A bullet of mass 50 g is traveling parallel to the ramp surface at 250 m/s. It collides with the block, enters it, and exits the other side at 100 m/s.

Metals are good thermal conductors - that is, when there is a temperature difference across their ends, they transfer energy very efficiently from the higher temperature end to the lower temperature end.

Some stars are so far away that their light hasn't reached Earth yet. A million years in the future, will the sources of light we see when we look up at night be the same? Why or Why not?

A sound wave travels through water. What best describes the direction of the water particles?

After heavy rains, the floodplain of a river can deposit sediment. The newly deposited soil is nutrient rich and would be good A. to use in a construction area. B. for growing vegetation and crops. C. for holding objects in the ground. D.