A bat, flying at 3.00 m/s toward a wall, emits a chirp at 50.0 kHz. If the wall reflects this sound pulse, what is the frequency of the echo received by the bat? (vsound = 340 m/s)
a. 51.5 kHz
c. 40.8 kHz
b. 51.2 kHz
d. 50.9 kHz
D
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A sled weighs 160 N. It is held in place on a frictionless 25.0° slope by a rope attached to a stake at the top; the rope is parallel to the slope. What is the normal force of the slope acting on the sled?
a. 145 N b. 67.6 N c. 177 N d. 379 N e. 74.6 N
What is a major selecting factor for astronomers looking to place a telescope atop a mountain?
a. non-turbulent airflow b. percentage of tree-coverage c. amount of precipitation d. the country it is located within e. the economics of the location
Suppose that you are isolated and "floating" in outer space and that you hold a wooden block and a lead block, one in each hand, and that the two blocks look and feel identical. How could you tell which one is the lead block?
A) Give each one a light tap with your finger; the one that accelerates the least is the lead block. B) Let go of them; the one that falls the fastest is the lead block. C) Give each one a light tap with your finger; the one that accelerates the most is the lead block. D) None of the above methods could tell you which block is the lead block.
Which of the following is NOT an active galaxy?
A. Seyfert galaxies B. QSO's C. radio galaxies D. Attractor voids E. None of these choices is an active galaxy.