800 joules of work was done lifting a 200 newton box to a shelf directly above the box. How many meters high was the shelf?

To test the quality of a tennis ball, you drop it onto a floor from a height of 4.00m. It rebounds to a height of 2.00 m. If the ball is in contact with the floor for 12.

A hypothesis is? close agreement by competent observers of observations of the same phenomena. a guess that has been tested over and over again and always found to be true. an educated guess that has yet to be proven by experiment.

Do two electrons placed near each other repel or attract each other?

How does a longshore current change the beach

A 1400 kg car at rest at a stop sign is rear ended by a 1860 kg truck traveling at a speed of 19.1 m/s. After the collision, the two vehicles are locked together.

The muscles of a runner transform chemical potential energy into what?

Compare how your weight, mass, and the normal force exerted by the floor change when you are in an elevator that starts from rest and accelerates upward.

When experiencing loss in your life, you are likely to experience grief, but not stress True or False

What is the specific heat of wood?

A certain wave motion has a frequency of 10 cycles / s and a wavelength of 3 m. so its propagation speed is