How do ultraviolet rays affect skin

The basic speed law means you should

An object travels 20 m in 4 a what is its speed

What type of energy increases when friction does work on an object

If the atmospheric pressure at 30.0 km is 28.0 torr and the temperature is - 39.0 °c, what is the volume of the balloon when it bursts?

If two people standing on a scooter board push off of each other what happens (Newton's 3rd law)

A ball is being rolled by a normal push of 1000N. it is opposed by friction which has a force of 0.3kN and air resistance which has a force of 23N. Calculate the resultant force.

What was the change in internal energy (chemical energy plus thermal energy) of the person pulling the block?

One of the longer sides of a kite is 39 feet. one of the shorter sides is 25 feet. half the length of the shorter diagonal is 15 feet. what is the area of the kite?

As the width of an opening in a barrier increases, how will the amount of diffraction of the planar waves change as they pass through the opening? A. It will increase. B. It will decrease. C. It will remain the same.

Two forces whose resultant is 100N, are perpendicular to each other. if one of them makes an angle of 60° with the resultant, calculate it's magnitude Calculate the absolute pressure of an ocean depth of 1200atm.