Using 1000 j of work, a toy elevator is raised from the ground floor to the second floor in 20 s. how much power does the elevator use?

What color of light can plants "see"?

The resistance of a circuit is doubled. How is the value of the current affected? A. The current decreases by a factor of 1/4 B. The current decreases by a factor of 1/2 C. The current increases by a factor of 2. D.

if a laboratory balance accurately measures mass on the earth, can it accurately measure it on the moon?

A green dot in the middle of 4 concentric circles. The first away from the green dot is labeled n = 1. The second circle away from the green dot is labeled n = 2.

Calculate the wavelength λ1 for gamma rays of frequency f1 = 7.50*1021 hz.

How are water bottles recycled?

The electromagnetic waves that have the lowest frequency is called

A bullet is fired horizontally with an initial velocity of 144.7 m/s from a tower 11 m high. if air resistance is negligible, what is the horizontal distance the bullet travels before hitting the ground?

A 0.2 kg conductor of length 0.8 m carries 2 ampere current to the right in a magnetic field. What is the magnitude and the direction of the magnetic field acting on the conductor if the net force on the rod is zero?

A model rocket with a mass of 0.181 kg is launched into the air with an initial speed of 92 m/s. How much kinetic energy will the rocket have at a height of 164 m? Assume there is no wind resistance.