Valles Marineris is a
A) large valley on the Moon.
B) vast plain on Mars.
C) huge series of cliffs on Mercury.
D) large canyon on Mars.
E) large canyon on Venus.
D
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The places where the Sun crosses the equator are called the
A) annalemmas. B) prime meridians. C) zeniths. D) equinoxes. E) solstices.
A violinist discovers while tuning her violin that her string is flat (has a lower frequency). She should
A. tighten the string. B. loosen the string. C. play faster.
Exhibit 11-1
Two birds of prey hurtling after the same mouse collide in mid-air and grab each other with their talons. Each 250-g bird is flying at 30 m/s at a 60° angle to the ground.
?
?
Use this exhibit to answer the following question(s).
Refer to . What is the magnitude of their velocity, in m/s, immediately after the collision?
a.
0
b.
13
c.
15
d.
26
e.
30
A heat engine has an efficiency of 35.0% and its power output is 600 W. What is the rate of heat input?
A. 1.8 kW. B. 2.0 kW. C. 2.4 kW. D. 3.0 kW.