If you run a 3000-watt hair dryer for 30 minutes, how much electric energy do you consume?
A) 100 kW ? h
B) 6 kW ? h
C) 1.5 kW ? h
D) 90,000 kW ? h
E) None of the above.
C
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You throw a rock upward. The rock is moving upward, but it is slowing down. As we define the ground as the origin, the position of the rock is _____ and the velocity of the rock is _____
A. Positive, positive B. positive negative C. negative positive D. Negative Negative
Which of the following statements about circumpolar stars is true at all latitudes?
A) They are the stars close to the north celestial pole. B) They always remain above your horizon. C) They make relatively small circles, traveling clockwise around the north celestial pole. D) Like all other stars, they rise in the east and set in the west. E) You cannot see them from the Southern Hemisphere.
What color are most of the stars closest to the Sun?
What will be an ideal response?
The force responsible for a car moving steadily along a no-friction icy banked curve is due to
A) centrifugal effects. B) the normal force at right angles to the curved surface. C) the radial component of the normal force. D) none of the above