How do you separate the mixture of rocks and sand

you are standing directly above a fish in a water filled aquarium. the actual depth of the fish is one-half the distance from the surface to the bottom. as you look down at it, where does the fish appear to be?

Which is the best example of refraction

If a balloon is left in a closed car on a hot day, what will happen to it?

What are 2 important statements about physical properties?

A proton (rest mass 1.67*10-27kg) is moving at 0.905 c. Find the momentum of the proton. Express your answer with the appropriate units.

A car travels 35.0 mph north for 1.00 hour, then 40.0 mph east for 0.0500 hour, and finally 50.0 mph northeast for 2.00 hours. Calculate the average speed.

A 500 lb steel beam is lifted up by a crane to a height of 100 ft and is held there. A) How much work is being done to hold the beam in place? B) How much work was done to lift the beam?

If Light is shone through the slits of a card onto a sheet of white paper describe what is seen.

When you break a magnet in half, how many poles does each piece have? Explain.

What can you use to unscrew a tiny screw?