A car of mass M, traveling with a velocity V, strikes a parked station wagon, whose mass is 2M. The bumpers lock together in this head-on inelastic collision. What fraction of the initial kinetic energy is lost in this collision?
A) 1/4
B) 1/9
C) 1/2
D) 2/3
E) 1/3
D
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CCDs are widely used in astronomy because the images are easily manipulated in computers, but photographic film is actually more sensitive to photons.
Answer the following statement true (T) or false (F)
What do "forbidden" lines reveal about interstellar space?
A) The density or pressure of this gas is much lower than can be produced in a laboratory. B) The laws of physics are not the same in space as they are on Earth. C) There are unknown elements in space that do not correspond to elements found on Earth. D) There are molecules found in meteorites and interstellar dust that are not found on Earth. E) All of the above are true.
The interval from new Moon to first quarter is about a(n)
A) hour. B) day. C) week. D) month. E) year.
Joe and Bill throw identical balls vertically upward. Joe throws his ball with an initial speed twice as high as Bill. Assuming there is no air resistance, the maximum height of Joe's ball will be
A) four times that of Bill's ball. B) two times that of Bill's ball. C) equal to that of Bill's ball. D) eight times that of Bill's ball. E) roughly 1.4 times that of Bill's ball.