A 300-N sled is pulled up a 28° slope at a constant speed by a force of 250 N. What is the coefficient of kinetic friction between sled and slope?
a. 0.21
b. 0.41
c. 0.11
d. 1.55
e. 2.95
b
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Saturn has several enduring major storm systems similar to Jupiter's Great Red Spot
Indicate whether the statement is true or false
If the Moon rises around 3 A.M., its phase must be
A) full. B) first quarter. C) third quarter. D) waning crescent. E) waxing crescent.
A situation known as "population inversion" is needed for lasing action. What does "population inversion" mean?
A. Electrons are in the -1/2 state. B. Excited atoms must be at the top of the laser tube. C. Excited atoms must be at the bottom of the laser tube. D. The number of excited states that are to emit photons are in greater number than the lower states at which the transition is ending. E. The number of lower states are in greater number than the upper states participating in the lasing action.
Approximately how many extrasolar planets have been discovered to date?
A) tens B) hundreds C) thousands D) millions E) billions