An object has traveled 20 meters in 40 seconds what is its average speed

Satellite 1 revolves around a planet at the altitude equal to one-half the radius of the planet. The period of revolution of satellite 1 is.

If the voltage across a circuit of constant resistance is doubled, how is the current in the circuit affected? If the voltage across a circuit of constant resistance is doubled, how is the current in the circuit affected?

A hair's form and structure is known as what?

Explain how electromagnetic waves can be used to measure distances of components in the universe.

If you had 8 basketballs and 1 of them weighed more than the others but you didn't know which one it was, you have a basic 2 sided scale but you can only use it twice, how do you find the ball that weights the most?

The sources of the heat inside Earth

A microwave is rated at 750 watts. How long will it take the microwave to do 5700 J of work on a cup of water? Assume 100% efficiency. A) 0.13s B) 2s C) 7.6s D) 4,275,000 s

A block hangs at rest from the ceiling by a piece of rope. Consider the forces acting on the block. Is gravity present or absent?

A nurse counts 66 heartbeats in one minute. What is the period of the hearts oscillation? In minutes

A room is 16 ft x 12 ft x 12 ft. would air enter or leave the room if the temperature changed from 27°c to - 3°c while the pressure remained constant? Determine the volume of the air which moved in or out of the room.