Planets do not move in precise ellipses, as had been thought by Kepler, because of
A) dust grains and other material that disturbs the orbits.
B) influences due to the other planets.
C) Both of the above.
D) Nonsense--the planets actually do move in precise ellipses.
C
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The photoelectric effect supports a
A) wave nature of light. B) particle nature of light. C) both of these D) none of these
Why didn't a planet form where the asteroid belt is now located?
A) Gravitational tugs from Jupiter prevented material from collecting together to form a planet. B) There was not enough material in this part of the solar nebula to form a planet. C) There was too much rocky material to form a terrestrial planet, but not enough gaseous material to form a jovian planet. D) The temperature in this portion of the solar nebula was just right to prevent rock from sticking together.
Dropped objects on the Moon fall at a slower rate than on Earth because of a smaller ______________
Fill in the blank(s) with correct word
An air sample is contaminated with 15O, which has a half-life of 2.03 min. One possible way to minimize its hazard is to pass it through a long pipe to allow it to decay inside the pipe until it can be safely released into the atmosphere
If the oxygen moves at a speed of 1.1 m/s in the pipe, how long must the pipe be for the sample to have decayed to 3.0% of its original activity just as it leaves the pipe? A) 680 m B) 8.0 m C) 7.0 m D) 2.0 m