Fission is used in
a. atomic bombs
b. power plants
c. energy for stars
d. hydrogen bombs
e. a tokamak reactor
A, B
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LMC X-3 is a binary system that is believed to contain a black hole
a. True b. False Indicate whether the statement is true or false
For water to have been stable on Mars in the past,
A) temperature must have been higher and the atmospheric pressure lower B) temperature must have been lower and the atmospheric pressure higher C) both the temperature and the atmospheric pressure must have been higher D) both the temperature and the atmospheric pressure must have been lower
The distribution of stars in the Galactic Bulge reminds us of the distribution of objects in the solar system's ________ Belt beyond Neptune
A) Oort B) Shapley C) Hubble D) Kuiper E) Kepler
The vector sum of three co-planar forces
a. must be zero. b. must be perpendicular to one of the three. c. must be parallel to one of the three. d. must be perpendicular to the plane. e. may have any direction in the plane.