While you are sounding a tone on a toy whistle, you notice a friend running toward you. If you want her to hear the same frequency that you hear even though she is approaching, you must
a. stay put.
b. run towards her at the same speed. c. run away from her at the same speed. d. stay put and play a note of higher frequency.
e. run towards her and play a note of higher frequency.
C
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A block is supported on a compressed spring, which projects the block straight up in the air at velocity 
. The spring and ledge it sits on then retract. You can win a prize by hitting the block with a ball. When should you throw the ball and in what direction to be sure the ball hits the block? (Assume the ball can reach the block before the block reaches the ground and that the ball is thrown from a height equal to the release position of the block.)
A. At the instant when the block leaves the spring, directed at the block B. At the instant when the block leaves the spring, directed at the spring C. At the instant when the block is at the highest point, directed at the block D. At the instant when the block is at the highest point, directed at the spring E. When the block is back at the spring's original position, directed at that position
In A.D. 1054, Chinese astronomers observed the appearance of a new star, whose location is now occupied by
a. a pulsar. b. a neutron star. c. a supernova remnant. d. all of the above
Thin Lenses: When a flower petal is 4.0 cm in front of a converging lens, the inverted image is half the height of the petal. What is the focal length of this lens?
A. 1.3 cm B. 2.0 cm C. 4.0 cm D. 5.3 cm
If the net flux through a closed surface is zero, then there can be no charge or charges within that surface
Indicate whether the statement is true or false