Two dogs, Rover and Fido, run on a level frictionless surface. Rover runs eastward with a momentum of 24 kg . m/s, and Fido runs northward with momentum 10 kg . m/s. They make a sudden perfectly inelastic collision
What is the magnitude of their combined momentum after the collision?
A) 14 kg . m/s
B) 34 kg . m/s
C) 26 kg . m/s
D) It cannot be determined without knowing the masses and velocities of the dogs.
C
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A ball player wishes to determine pitching speed by throwing a ball horizontally from an elevation 5 m above ground level. The ball lands 20 m downrange. The player's pitching speed is about
A) 5 m/s. B) 10 m/s. C) 20 m/s. D) 25 m/s. E) none of the above
Which of the following statements comparing open and globular star clusters is not true?
A) Stars in open clusters are relatively young while stars in globular clusters are very old. B) Open and globular clusters each typically contain a few hundred stars. C) For both open and globular clusters, we can assume that all the stars in a particular cluster are about the same age. D) Open clusters are found only in the disk of the galaxy while globular clusters may be found both in the disk and the halo of the galaxy.
The index of refraction of diamond is 2.42. This means that a given frequency of light travels
A) 2.42 times faster in air than it does in diamond. B) 2.42 times faster in diamond than it does in air. C) 2.42 times faster in vacuum than it does in diamond. D) 2.42 times faster in diamond than it does in vacuum. E) 2.42 times faster in vacuum than it does in air.
An AC series circuit has 8.00-W resistance, 15.00-W inductive reactance, and 10.00-W capacitive reactance. If an effective (rms) emf of 120 V is applied, what is the effective (rms) current value?
a. 26.0 A c. 9.23 A b. 5.31 A d. 12.7 A