Which planet has no atmosphere, which prevents erosion?

A. Neptune

B. Uranus

C. Mars

D. Mercury

A teacher performing demonstration finds that a piece of cork displaces 23.5 ml of water. The piece of cork has a mass 5.7 g. What is the density of the cork?

What's the mass of a bag of apples

A 18.0-kg rock is sliding on a rough, horizontal surface at 7.10 m/s and eventually stops due to friction. the coefficient of kinetic friction between the rock and the surface is 0.175. what average power is produced by friction as the rock stops?

If the velocity of a runner changes from - 2 m/s to - 4 m/s over a period of time, the runner's kinetic energy will become: (a) four times as great as it was. (b) half the magnitude it was. (c) energy is conserved. (d) twice as great as it was.

1000 kg has 50, 000 joules of kinetic energy. what is it's speed?

For a vacation, you and your family fly east to west from Boston, Massachusetts, to Seattle, Washington. You notice that your flight back home to Boston is shorter than your flight to Seattle. Which phenomenon causes your flight home to be shorter?

You spy on an anchor on the bottom of a lake. What is the direction and amount of force the water exerts on it: a) zero b) up, equal to the weight of the anchor. c) up, less than the weight of the anchor d) down, equal to the weight of the anchor.

How are electromagnetic waves different from matter waves?

A dc generator is the same as a (n) a. electric motor. b. ac generator. c. armature. d. electric current.

Which of the following best describes scientific knowledge A.) Durable B.) Absolute and never changing C.) Frequently varies