In the process of nuclear fusion,
A) two or more nuclei fuse or stick together to form a heavier nucleus that has exactly the same mass as the original nucleus
B) a heavy nucleus breaks apart into a number of smaller nuclei whose combined mass is less than the original nucleus
C) two or more nuclei fuse or stick together to form a heavier nucleus whose combined mass is slightly less than the original nucleus
D) two or more nuclei fuse or stick together to form a heavier nucleus whose combined mass is slightly greater than the original nucleus
C
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Which of the following statements regarding the H-R diagrams of star clusters is NOT correct?
A. A very young cluster will have stars that lie in the right-hand side and a little above the main sequence. B. A very young cluster will not show a turn-off point. C. A very old cluster will have many stars in the upper left corner of the H-R diagram. D. A very old cluster will show a turn-off point and will have many red and yellow giant stars. E. A very young cluster will not have all its stars on the main sequence.
Atmospheric pressure at an altitude of 10,000 m is exactly half of what it is at 5,000 m
Indicate whether the statement is true or false
When Portland cement and aggregate are mixed with water, _________reactions bond the Portland cement to the aggregate, thereby forming solid concrete.
Fill in the blank(s) with the appropriate word(s).
A brass wire (d 5 2.0 mm, E 5 110 GPa) is pretensioned to T 5 85 N. The coefficient of thermal expansion for the wire is 19.5 3 1026/°C. The temperature change at which the wire goes slack is approximately:
(A) 15.7 °C
(B) 212.6 °C
(C) 112.6 °C
(D) 218.2 °C