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
Answer: A. Positive, positive
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Ten lbm of carbon dioxide gas are cooled from 150ºF to 80ºF. The specific heat at
The principal advantage of ac power over dc power is that
A) more energy is dissipated during transmission. B) ac voltage oscillates while dc voltage does not. C) ac voltage can be transformed via conventional transformers. D) ac circuits multiply power more easily. E) ac circuits are safer.
An object is placed a distance d in front of a plane mirror. The size of the image will be
A) dependent on the distance d. B) half as big as the size of the object. C) twice the size of the object. D) dependent on where you are positioned when you look at the image. E) the same size as the object, independent of the distance d or the position of the observer.
In Figure 9.1, the time t, when P returns to the original position on the x-axis, is closest to:
A) 13 s B) 18 s C) 25 s D) 35 s E) 50 s