A moving bicycle exhibits less stability when the angular momentum of the wheels is less, which means
A. the inverse of the forward speed equals the torque.
B. its forward speed is also slower.
C. its forward speed is faster.
Answer: B
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Which characteristic of Earth explains why we have an ultraviolet-absorbing stratosphere?
A) the existence of photosynthetic life B) the existence of plate tectonics C) the moderate surface temperature D) the existence of oceans
Global warming
a. has not yet been observed b. has been caused by increasing levels of carbon dioxide in the atmosphere c. has led to a depletion of the ozone layer in the atmosphere d. has no serious consequences
In the chemical formula for water, H2O, what does the "2" mean?
a. There are two oxygen (O) atoms in a molecule of water. b. There are two hydrogen (H) atoms in a molecule of water. c. The hydrogen in water is actually deuterium. d. none of the above
A batter hits a 0.140-kg baseball that was approaching him at 30 m/s and, as a result, the ball leaves the bat at 40 m/s in the reverse of its original direction. The ball remains in contact with the bat for 2.0 ms
What is the magnitude of the average force exerted by the bat on the ball?