The presence of breccias among the lunar rock samples shows that
a. volcanism did not occur on the Moon.
b. molten lava once flowed over the lunar surface.
c. the crust must have been made of anorthosite.
d. water once existed on the Moon in the form of small lakes and streams.
e. the lunar surface was fragmented by meteorite impacts.
e
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Thermal efficiency (non-Carnot) is
A) Q/T. B) Q/m. C) 1 – Qcold/Qhot. D) Q - W. E) 1 - Tcold/Thot.
An 80-kg football player travels to the right at 8 m/s and a 120-kg player on the opposite team travels to the left at 4.0 m/s. The total momentum is
A. 240 kg m/s to the left. B. 160 kg m/s to the right. C. zero. D. 1120 kg m/s to the right. E. 160 kg m/s to the left.
A ball of mass 5 kg attached to a string is swung in a horizontal circle of radius 0.5 m. If the tension in the string is 10 N, the work done by the tension in one revolution is ________ J.
Fill in the blank(s) with the appropriate word(s).
How is the geometry of an ellipse described?
What will be an ideal response?