A valid unit for momentum is which of the following?
a. kgm/s2
c. kgm/s
b. kg/m2
d. Nm
C
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Standing Sound Waves: Consider a pipe of length L that is open at both ends. What are the wavelengths of the three lowest-pitch tones produced by this pipe?
A. 4L, 2L, L B. 2L, L, L/2 C. 2L, L, 2L/3 D. 4L, 4L/3, 4L/5
A "standing wave" is a wave that
A) vibrates at zero amplitude. B) vibrates and moves from one place to another but whose shape does not change. C) doesn't vibrate. D) a wave that is in the process of reversing its direction of motion. E) vibrates but whose "loops" don't move from one place to another.
How do we know that halo stars are older, on average, than disk stars?
A) Halo stars orbit in random directions but disk stars have more ordered orbits. B) There are no blue halo stars. C) There are no red disk stars. D) Theories of galaxy formation tell us that the halo formed earlier than the disk. E) We see evidence for new stars forming in the disk today.
The unit of magnetic flux is the weber. 1 Wb equals
A. 1 V·m.
B. 1 V·s/A.
C. 
D. 