A satellite of mass m1 circles a planet of mass m2 and radius r in an orbit at a height 2r above the surface of the planet. What minimum energy is required to change the orbit to one for which the height of the satellite is 3r above the surface of the planet?
A.
B.
C.
D.
E.
Answer: A
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The hydrogen in the universe was formed by the energy of the Big Bang
Indicate whether the statement is true or false
If the Moon sets at 10 A.M. today, approximately what time did the Moon set yesterday?
A. 10:50 A.M. B. 9:10 A.M. C. 9:56 A.M. D. 10:04 A.M.
A long linear charge distribution of charge density 1.35 nC/m is surrounded by a concentric cylindrical surface of length 1.60 m and radius 23.6 cm. What is the electric flux through the surface of the cylinder?
A. 0.00
B. 160 
C. 244
D. 280
E. 316
The statements below are all true. Some of them represent important reasons why the giant impact hypothesis for the Moon’s formation is taken seriously, and some of them are not relevant to deciding between this and other hypotheses. Sort the statements into the correct bin according to whether or not they provide important support to the giant impact hypothesis.
