What causes earthquakes?

if a rock has a speed of 12 m/s as it hits the ground, from what height did it fall assuming the speed was zero. its mass is 50 kg

How do you think Earth's affects what is happening on the surface?

Earths inner core is

Acceleration can be a change in speed or what

A 946.4 kg (2083 lb) car is moving at 14.8 m / s (33.0 mph). Calculate the magnitude of its momentum.

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.