Galileo stated that a ball rolled along a level surface it would
A. keep rolling without slowing down if no friction acted upon it.
B. roll as long as its inertia nudged it along.
C. eventually roll in the opposite direction.
D. slow down due to its natural tendency to come to rest.
Answer: A
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Just after an alpha particle leaves the nucleus, would you expect it to speed up? Why?
A. Yes. Once the alpha particle leaves the nucleus, there are no more forces acting on it and it therefore accelerates. B. No. As the alpha particle leaves the nucleus, it is slowed by the constant attraction of the electrons surrounding the nucleus. C. Yes. Once the alpha particle leaves the nucleus, it accelerates because of mutual electric repulsion with the nucleus from which it escaped. D. No. Once the alpha particle leaves the nucleus, it is slowed by the repulsion of the next closest atom's nucleus.
A rock exposure consists of layers of fine-grained, rounded particles that are cemented together. Which type of rock is it: igneous, metamorphic, or sedimentary?
What will be an ideal response?
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a. Barbados b. Belize c. Bahamas d. Argentina