Which of the following represents a chemical change to matter? A. digestion of food B. melting an ice cube C. shredding paper D. crushing an ice cube

People living in the Amazon Rain Forest want to clear the forest of vegetation and create farmland so they can grow crops. How will clearing away vegetation affect soil erosion

Name two instruments that are based on the law of flotation

Which of the following statement about biofuels is NOT true? a. Biofuel is a fuel made from living things. b. Products previously considered waste can finding new life as biofuel. c. Cooking waste oil is not considered as a biofuel. d.

Explain how the density of a submarine changes so that it can sink

Protons are made up of ___ up quark (s) and ___ down quark (s). a. 1, 1 b. 1, 2 c. 2, 1 d. 2, 2

You need to raise a heavy block by pulling it with a massless rope. You can either (a) pull the block straight up height h, or (b) pull it up a long, frictionless plane inclined at a 15∘ angle until its height has increased by h.

A 320-m length of wire stretches between two towers and carries a 120-a current. determine the magnitude of the force on the wire due to the earth's magnetic field of 5.0 * 10-5t which makes an angle of 60 ∘ with the wire.

Light acts like a. a wave. b. a particle. c. neither a wave nor a particle. d. both a wave and a particle.

A uniform rope of length L and negligible stiffness hangs from a solid fixture in the ceiling. The free lower end of the rope is struck sharply at time t=0.

A 62 pound box is on an incline. Determine the minimum force P that would result in the box starting to slide up the incline. (include units with answer)