A bird, accelerating from rest at a constant rate, experiences a displacement of 22 m in 10 s. What is the average velocity?
a. 1.2 m/s
b. 2.2 m/s
c. 2.4 m/s
d. 0 m/s
e. 0.5 m/s
b
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Hydrogen lines are weak in the spectra of hot O-type stars because ____
a. most of the hydrogen has been converted to helium b. a good spectrum of these stars is difficult to obtain c. these stars have no atmosphere d. gravitational pressure pushes all the hydrogen lines out of the visible spectrum e. most of the hydrogen is ionized to high energy levels
Mercury's _______________ are marked by meteorite craters less than 15 km in diameter, in addition to secondary craters
Fill in the blank(s) with correct word
Consider the loop of flexible wire shown below. If we pass a current through the loop, will it tend to expand (becoming more circular), scrunch up even more tightly, or do nothing?
A. Expand
B. Scrunch up
C. Do nothing
D. The answer depends on the current’s direction.
How do we measure stellar masses?
A) We measure their apparent brightness and distance (from parallax). B) We don't really know: stellar masses are based on an informed guess. C) We measure the orbital periods and velocities of stars in binary systems. D) We measure their density and radius.