Energy Conservation With Nonconservative Forces: On a planet where g = 10.0 m/s2 and air resistance is negligible, a sled is at rest on a rough inclined hill rising at 30° as shown in the figure. The object is allowed to move and it stops on a rough horizontal surface, at a distance of 4.0 m from the bottom of the hill. The coefficient of kinetic friction on the hill is 0.40. What is the coefficient of kinetic friction between the horizontal surface and the sled?
A. 0.10
B. 0.20
C. 0.31
D. 0.40
E. 0.60
Answer: C
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Which of these is the correct definition for an ellipse?
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Consider a situation where a skater pulls her arms inward, causing her rotation rate to speed up. Angular momentum
a. is definitely conserved b. is definitely not conserved c. may or may not be conserved d. none of the above
The large planetesimals would have grown faster than the smaller planetesimals because
a. they were moving faster in their orbits than the smaller planetesimals. b. their stronger gravity would pull in more material. c. there was more material located near them that could be accreted. d. the smaller planetesimals were covered by a layer of material that was lost during collisions. e. All of the other choices are correct.
What is meant by the Astronomical Unit?
What will be an ideal response?