A person rolls a barrel up an inclined plane with a length of 6m and a height of 3m / How much force is needed to roll up the barrel the length of the inclined plane if the barrel weighs 500N? How much work is done on the barrel?

What are the Units of resistance?

Which statement best explains why nonpolar substances have low solubility in water? a) They are much larger than water. b) They are much denser than water. c) They have strong mutual attractions. d) They cannot form hydrogen bonds to water.

5. The moon's gravity is one-sixth that of the earth. What is the period of a 0.50 m long pendulum on the moon?

What color of light has the most energy? A. Blue B. Red C. Green

Which jet stream affects weather in the United States?

What causes day and night on earth?

A yo-yo can be thought of as a solid cylinder of mass m and radius r that has a light string wrapped around its circumference (see below). One end of the string is held fixed in space.

Why is time an independent variable and position is a dependent variable in a position versus time graph

A geologist estimates that a large boulder weighs 7840 N. What should he estimate the mass of this boulder to be? A. 650 kg B. 740 kg C. 780 kg D. 800 kg

Two objects have the same momentum. Do the velocities of these objects necessarily have (a) the same directions and (b) the same magnitudes? Give your reasoning in each case.