A 75.0-kg firefighter climbs a flight of stairs 28.0 m high. How much work does he do?

Green light has a lower frequency than blue light. Which color of light has a longer wavelength?

How could you increase the kinetic thermal energy of a water

Joseph put water, sugar, and yeast into a balloon. Then he put the balloon in a warm place for 1 hour. which is most likeley to happen to the balloon

What are the four factors that determine weather?

What are organelles? Describe the role of two organelles within the cell.

The engine that powers a crane burns fuel at a temperature of 1500 oC. It is cooled by air at a temperature of 20 oC. The crane is used to lift a 1000 kg steel girder 30 m into the air.

The portion of a light ray that falls on a surface is a/an

Give the definition for diffusion. (A) gas molecules mix unequally average distance between collisions (B) gas molecules escape from a container into a vacuum through a small hole (C) gas molecules mix equally (D) gas molecules spread out in a

As resistance goes up, what happens to the current?

1. A 0.828-nm photon collides with a stationary electron. After the collision, the electron moves forward and the photon recoils backwards. a) Find the momentum of the electron. b) Find the kinetic energy of the electron.