The figure below shows a graph of angular velocity as a function of time for a car driving around a circular track. Through how many radians does the car travel in the first 10 minutes?
A. 30
B. 50
C. 70
D. 90
E. 100
Answer: C
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An image is formed by a converging lens. Suppose the bottom half of the lens in covered, as shown
What happens to the image?
The amount of energy needed to move an electron from a lower energy level to a higher energy level is the ____
a. energy of the higher level b. energy of the lower level c. difference in energy between the two levels d. product of the energies of the two levels e. binding energy
What kind of thermal radiation does the Earth emit?
A) infrared light B) infrared, visible, and ultraviolet light C) infrared and visible light D) visible and ultraviolet light E) visible light
A positively charged rod is brought close to an uncharged electroscope. While the rod is close, one's finger touches the far side of the metal ball on the electroscope. The finger is removed and then the rod is taken away. The electroscope is
A. uncharged. B. positively charged. C. negatively charged.