A 3. kg ball of putty moving at 1 m/s collides and sticks to a 2 kg ball initially at rest. The putty and ball then move with a momentum of
A) 1 N-s.
B) 2 N-s.
C) 4 N-s.
D) 3 N-s.
E) 0 N-s.
D
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A boxcar of mass 200 tons at rest becomes uncoupled on a 1.5° grade. If the track is considered to be frictionless, what speed does the boxcar have after 10 seconds?
a. 0.37 m/s c. 2.6 m/s b. 0.59 m/s d. 4.3 m/s
A chemical reaction generally has a great effect on an atom's
a. nuclear structure. b. mass. c. nuclear binding energy. d. electron configuration.
Marcia places a lead block and an iron block on the table, and hits both of them with the same force. The lead block is twice as massive as the iron block. The acceleration of the lead block is
A) half that of the iron block. B) a quarter of that of the iron block. C) equal to that of the iron block. D) two times that of the iron block. E) four times that of the iron block.
If you were to inhale a few breaths from a helium gas balloon, you would probably experience an amusing change in your voice. You would sound like Donald Duck or Alvin the Chipmunk. What is the cause of this curious high-pitched effect?
A) The helium causes your vocal cords to tighten and vibrate at a higher frequency. B) For a given frequency of vibration of your vocal cords, the wavelength of sound is less in helium than it is in air. C) Your voice box is resonating at the second harmonic, rather than at the fundamental frequency. D) Low frequencies are absorbed in helium gas, leaving the high frequency components, which result in the high, squeaky sound. E) Sound travels faster in helium than in air at a given temperature.