A steel rod 55 cm long has a diameter of 30 cm. The compressive strength (the maximum stress it can support without breaking) of this steel is 500 × 106 N/m2. What is the compression force that would break the rod?
A) 3.5 × 107 N
B) 2.4 × 107 N
C) 1.4 × 108 N
D) 4.7 × 108 N
E) 8.9 × 108 N
A
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An amount of a monatomic ideal gas is taken around the process shown. The amount of heat extracted during process B-C is:
1.10 J
2.20 J
3.15 J
4.45 J
5.60 J
6.none of the above
7.cannot be determined
According to observations, which type of galaxy was much more common when the universe was 2 billion years old than it is today?
A) irregular galaxies B) elliptical galaxies C) spiral galaxies D) We can't say because humans were not alive at that time.
The period of the Moon's rotation on its axis is
A. much shorter than its revolution around the Earth. B. much longer than its revolution around the Earth. C. the same as its revolution around the Earth. D. longer or shorter depending on what part of the year we are in.
The fact that the binding energy per nucleon does not depend very strongly on the volume of the nucleus indicates that
a. the strong nuclear force saturates. b. nucleons don't move throughout the nucleus. c. all nuclei have the same volume. d. the radius of a nucleus is directly proportional to the number of nucleons.