A child pulls a 3.00-kg sled across level ground at constant velocity with a light rope that makes an angle 30.0° above horizontal. The tension in the rope is 5.00 N. Assuming the acceleration of gravity is 9.81 m/s2, what is the coefficient of friction between the sled and the ground?

One of the main reasons the Hubble Space Telescope was built and launched was to measure how fast the universe is expanding. If the expansion turns out to be faster than we thought, our estimate for the age of the universe will be

A) older (more time between now and the Big Bang). B) younger (less time between now and the Big Bang). C) unaffected.

A stone is thrown straight up. What is its acceleration on the way up?

What will be an ideal response?

Orthoclase and plagioclase are the two major types of ______________

Fill in the blank(s) with correct word

This graph shows that the orbit of a binary pulsar is decaying just as general relativity predicts it should (notice the agreement between data and theory). What is the significance of this particular result?

A) It supports the prediction that orbiting stars will radiate energy outward in the form of gravitational waves. B) It tells us that time runs slower in this binary system than on Earth. C) It confirms that gravitational lensing can really occur. D) It shows that general relativity can explain all known natural phenomena.