The neutron is radioactive and can beta decay to form a proton. This can occur primarily because:
a. the neutron is neutral.
b. of the binding energy of hydrogen.
c. the proton has less mass than a neutron.
d. there are several hydrogen isotopes.
C
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The pressure of an interstellar gas cloud depends on the cloud's ____________________ and ____________________
Fill in the blank(s) with correct word
The three principal types of mountain building are fold, volcanic, and ______________
Fill in the blank(s) with correct word
In the arrangement shown, a conducting bar of negligible resistance slides along horizontal, parallel, frictionless conducting rails connected as shown to a 2.0-? resistor. A uniform 1.5-T magnetic field is perpendicular to the plane of the paper. If L = 60 cm, at what rate is thermal energy being generated in the resistor at the instant the speed of the bar is equal to 4.2 m/s?
a.
8.6 W
b.
7.8 W
c.
7.1 W
d.
9.3 W
e.
1.8 W
One reason the planets near the Sun are composed mainly of rock and iron may be that
A. the Sun is made mostly of iron, so the planets nearest it are formed of iron. B. the Sun's heat made it difficult for ices and gases to condense near it. C. the Sun's gravity sucked in iron and heavy material and the lighter materials floated farther away. D. the Sun's magnetic field attracted all the iron into the region around the Sun.