The focal length is the distance from the middle of the lens to the what?

An object with a positive velocity and a negative acceleration will ...

A block of wood 3 cm on each side has a mass of 27 g. what is the density of the block

An air compressor takes normal air and pushes more and more of it in a rigid steel tank. The number of gas particles in the tank is increased. What happens to the temperature as more and more air is pushed into a tank which does not change size? A.

if it takes 3.5 hours for the hogwarts express moving at a speed of 120 mi/hr to make it from platform 9 and 3/4 to hogwarts how far apart are they?

The tides on earth are caused mainly by Earth's gravitational interactions with which of the following? a) sun and mars b) sun and moon c) moon and Jupiter d) mars and moon

A golfer strikes a golfball on the ground

Amy walks 32 m right and then 12 m left. She turns and walks another 28 m right and then turns and walks 7 m left. What is Amy's displacement?

When a bow is stretched back and an arrow is shot what type of energy conversion has occured

Does the sun sun traces shortest path across local sky on june solstice

You are on earth, and have an object with a mass of 7 kg. with how much force does the earth's gravity pull the object downward?