A car drives over a hilltop that has a radius of curvature 0.120 km at the top of the hill. At what speed would the car be traveling when it tires just barely lose contact with the road when the car is at the top of the hill?
A) 45.5 m/s
B) 41.8 m/s
C) 34.3 m/s
D) 22.2 m/s
E) 27.6 m/s
Answer: C
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A. 20 days B. 80 days C. 160 days D. 320 days E. 5 days
Over 20,000 stars are visible to the naked eye on the darkest, clearest nights
Indicate whether the statement is true or false
Which of the following best explains why nuclear fusion requires bringing nuclei extremely close together?
A) Nuclei are attracted to each other by the electromagnetic force, but this force is only strong enough to make nuclei stick when they are very close together. B) Fusion can proceed only by the proton-proton chain, and therefore requires that protons come close enough together to be linked up into a chain. C) Nuclei normally repel because they are all positively charged and can be made to stick only when brought close enough for the strong force to take hold. D) Nuclei have to be very hot in order to fuse, and the only way to get them hot is to bring them close together.
Why are we unlikely to find Earth-like planets around halo stars in the Galaxy?
A) Halo stars formed from gas containing lots of heavy elements and few of the light elements needed to create terrestrial planets like the Earth. B) Halo stars formed from gas containing few heavy elements, the elements needed to create terrestrial planets like the Earth. C) Planets around stars are extremely rare in our Galaxy. D) Halo stars formed directly from gas in the halo without forming a planetary disk. E) Halo stars are all very low mass stars that cannot hold onto planets.