The fact that you can see stars in the nighttime sky is evidence that
A) our atmosphere is transparent to visible light.
B) light can travel in a vacuum.
C) both of these
D) neither of these
Answer: C
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The average mass of the atoms of an element in naturally occurring samples is called the ______________ mass of the element
a. atomic b. average c. relative d. molecular
A small sphere attached to a light rigid rod rotates about an axis perpendicular to and fixed to the other end of the rod. Relative to the positive direction of the axis of rotation, the angular positions of the sphere are negative, its angular velocity is negative, and its angular acceleration is positive. The sphere is
a. rotating clockwise and slowing down. b. rotating counterclockwise and slowing down. c. rotating clockwise and speeding up. d. rotating counterclockwise and speeding up. e. first rotating counterclockwise and then clockwise.
When the Moon is on the horizon, it appears larger than when it is high in the sky. Why?
A. Its angular size is larger on the horizon. B. This is an optical illusion. C. When it is on the horizon, it is closer to us. D. The brightness of the Moon makes it seem larger. E. Earth's atmosphere acts like a lens, magnifying it.
A steady horizontal force lasting for 2.10 s gives a 1.25 kg object an acceleration of 3.20 m/s2 on a frictionless table. What impulse does this force give to the object?
A) 25.7 kg m/s B) 10.9 kg m/s C) 8.40 kg m/s D) 4.00 kg m/s E) 2.63 kg m/s