On which of these assumptions do Ptolemy and Copernicus agree?
A) The Earth must be the center of all motion in the Cosmos.
B) All orbits must be perfect circles.
C) The Sun was bigger than the Earth.
D) Venus must always stay between us and the Sun.
E) The Sun must orbit us, but the planets do orbit the Sun.
B
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A white dwarf generates energy through fusion
a. True b. False Indicate whether the statement is true or false
The loop is entirely inside the field.
A. forward (in the +x direction). B. backward (in the -x direction). C. zero. D. some other direction (specify).
At which of the following temperatures would one liter of water weigh the most?
a. 2°C b. 4°C c. 8°C d. 90°C e. It would weigh the same at all these temperatures.
By what factor is the self-inductance of a solenoid changed if only its cross-sectional area, A, is doubled?
a. 1/2 c. 2 b. 4 d. 8