As a body falls through air starting from rest, its velocity
a. stays constant.
b. continuously decreases.
c. continuously increases.
d. gets larger and larger, eventually reaching a constant value.
e. gets smaller and smaller, eventually approaching zero.
d
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Where are red giants on the H-R diagram?
A. upper left B. lower right C. lower left D. upper right
A 100-m long transmission cable is suspended between two towers. If the mass density is 2.01 kg/m and the tension in the cable is 3.00 × 10^4 N, what is the speed of transverse waves on the cable?
a. 60 m/s b. 122 m/s c. 244 m/s d. 310 m/s e. 1500 m/s
This image shows the velocity of gas moving toward or away from us on the Sun's surface, as measured through Doppler shifts; the key indicates the measured velocity, with negative velocities indicating gas moving toward us and positive velocities away from us. What do the small-scale changes in the shading represent in this map?
A) vibrations of gas moving up or down at the solar surface B) variations in the altitude of the solar surface C) variations in the temperature of the photosphere D) Nothing; this is an artist's rendering of the sun.
How long does it take an O-type star to form, compared to the time for a solar-type star to form?
A) 1/300 as long B) 1/30 as long C) about the same time D) 30 times longer E) 300 times longer