The number of significant figures in 10001 is
A) two.
B) three.
C) five.
D) six.
C
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Conservation of Momentum: A small car meshes with a large truck in a head-on collision. Which of the following statements concerning the magnitude of the momentum change during the collision is correct? (There could be more than one correct choice.)
A. The truck experiences the greater magnitude momentum change. B. The small car experiences the greater magnitude momentum change. C. The small car and the truck experience the same magnitude momentum change. D. The magnitude of the momentum change experienced by each one is inversely proportional to its mass. E. The magnitude of the momentum change experienced by each one is directly proportional to its mass.
A reversible engine takes in heat at a rate of 555 W and exhausts heat at 482 W
(a) How much power does it produce? (b) What is its efficiency? (c) If operated in reverse as a refrigerator, what would be its performance coefficient (COP)?
Suppose that a symmetry argument of some kind tells us that the electric field in a certain region points directly away from the nearest point on the y axis and has a magnitude that depends only on r, the distance to that nearest point. For which of the gaussian surfaces listed, would it be easiest to calculate the net flux of the electric field through that surface?
A. A cubical surface oriented so that two opposite faces are perpendicular to the y axis. B. A spherical surface. C. A cylindrical can-like surface oriented with its central axis perpendicular to the y axis. D. A cylindrical can-like surface oriented with its central axis parallel to the y axis. E. A cone-like surface oriented with its central axis parallel to the y axis.
What characteristic of sound determines the "pitch" of a musical note?
A) amplitude B) wavelength C) frequency D) phase E) intensity