____ about 130 km above Earth's surface near the polar regions when energy in the solar wind guided by Earth's magnetic field excites gases in the upper atmosphere
a. Coronas occur
b. Flares occur
c. Auroras occur
d. Coronal holes occur
e. Nuclear fission occurs
C
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How would our view of our galaxy be different if we were located in the central bulge? What about if we were located in a halo globular cluster?
What will be an ideal response?
A 2000 kg car is traveling on a banked curved icy road. The road is banked at an angle of 12.0 degrees and has a radius of curvature of 500 m. The velocity of the car necessary to travel on the icy road without sliding is
A. 32.3 m/s. B. 40.5 m/s. C. 42.8 m/s. D. 49.5 m/s. E. 50.2 m/s.
A certain star is 1000 light years from Earth. According to the theory of relativity, is it physically possible for Mort to travel from Earth to this star during Mort's normal lifetime?
A) No, because Mort cannot travel faster than light. B) No, because the relativity of time will cause Mort to age too rapidly. C) No, because Mort's aging process is normal as measured in their own reference frame. D) Yes, by traveling at nearly lightspeed. E) Yes, by traveling much faster than lightspeed.
The planet COROT-14b is only slightly larger than Jupiter, but is several times as massive. Which is the most plausible explanation for its similar size to Jupiter?
A) The mass measurement is mistaken, and it is actually about 10 times more massive than Jupiter. B) Planets that are close to a star are hotter, causing them to puff up. C) It is made of elements other than hydrogen and helium which do not compress under their own gravity. D) The hydrogen and helium gas compressed under their own gravity to a higher density than Jupiter.