In our solar system, terrestrial planets are
A) small, made mostly of rock and iron with high densities, and found close to the Sun
B) large, made mostly of gases and liquids with low densities, and found far from the Sun
C) large, made of pure gases with low densities, and found far from the Sun
D) small, made of pure rock with high densities, and found close to the Sun
A
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Relative Velocity: A plane has an eastward heading with an airspeed of 156 m/s. A 20.0 m/s wind is blowing southward at the same time as the plane is flying. The velocity of the plane relative to the ground is
A. 157 m/s at an angle 7.31° south of east. B. 157 m/s at an angle 7.31° east of south. C. 155 m/s at an angle 7.36° south of east. D. 155 m/s at an angle 7.36° east of south. E. 157 m/s at an angle 7.36° south of east.
How fast do the fastest pulsars spin?
A: About 1200 times per second (twice as fast as a blender can go) B: About 600 times per second (fastest speed on a blender) C: About 300 times per second (half the top speed of a blender) D: About 60 times per second E: Exactly once per second, like clockwork
Which of the following light rays is drawn incorrectly?
A. a
B. b
C. c
D. d
E. e
The resistance of a wire can be increased by
a. making the wire longer. b. lowering the temperature of the wire. c. making the wire thinner. d. making the wire shorter.