Two carbon cylinders have radii 2r and r and the first has length 2L, while the second has length L. What is the resistance of the first if the resistance of the second is 12 
A. 48 
B. 6
C. 12
D. 24
D. 24
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An observer in the Northern Hemisphere watches the sky for several hours. Due to the motion of Earth, this observer notices that the stars near the north celestial pole appear to move
a. counter-clockwise around the celestial pole. b. clockwise around the celestial pole. c. from left to right. d. from right to left. e. nearly vertically upward.
Heat Engines: A certain automobile engine takes in 4.00 kJ of heat and performs 1.10 kJ of mechanical work in each cycle.(a) Calculate the engine's efficiency.(b) How much heat is "wasted" in each cycle?
What will be an ideal response?
What would happen if a small piece (say the size of a paper clip) of neutron star material struck Earth?
What will be an ideal response?
The Mesozoic era began about how many million years ago?
a. 3 b. 545 c. 245 d. 65