When Jim and Rob ride bicycles, Jim can only accelerate at three quarters the acceleration of Rob. Both start from rest at the bottom of a long straight road with constant upward slope. If Rob takes 5.0 minutes to reach the top, how much earlier should Jim start to reach the top at the same time as Rob?
a. 25 s
b. 40 s
c. 46 s
d. 55 s
e. 75 s
c
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A stone is thrown vertically upward with a speed of 24.0 m/s.
(a) How fast is it moving when it reaches a height of 13.0m? (b) How much time is required to reach this height?
Assuming all the atoms exhaled by Julius Caesar in his last dying breath are still in the atmosphere, we breathe in at least one of them each
A) single breath. B) day. C) month. D) ten years. E) can't say for some people breathe a few of Caesar's atoms daily, while others never.
The mass range for neutron stars is
A) 0.08 to 0.4 solar masses. B) 0.4 to 3 solar masses. C) 1.4 to 3 solar masses. D) 3 to 8 solar masses. E) 6 to 11 solar masses.
The warming of the lower atmosphere (the greenhouse effect) results from the
A) absorption of long-wave solar radiation. B) reflection of long-wave terrestrial radiation. C) absorption of long-wave terrestrial radiation by atmospheric gases. D) release of atmospheric gases into the ozone layer.