In a game of pool, the white cue ball hits the #5 ball and stops, while the #5 ball moves away with the same velocity as the cue ball had originally. The type of collision is
A) elastic.
B) elastic or inelastic, depending on the mass of the balls.
C) completely inelastic.
D) inelastic.
A
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Consider two identical and symmetrical wave pulses on a string. Suppose the first pulse reaches the fixed end of the string and is reflected back and then meets the second pulse. When the two pulses overlap exactly, the superposition principle predicts that the amplitude of the resultant pulses, at that moment, will be what factor times the amplitude of one of the original pulses?
a. 0 c. 2 b. 1 d. 4
The 21-cm line of hydrogen is strongly absorbed by interstellar dust
Indicate whether the statement is true or false
The most important properties of polymers are their low ______________and their high corrosion resistance. 22. In high-strength
Fill in the blank(s) with the appropriate word(s).
If a galaxy has a radial velocity of 8000 km/sec and the Hubble constant is 70 km/sec/Mpc, what is the distance to this galaxy?
a. 8.75 x 103 Mpc b. 2.4 x 109 Mpc c. 5.6 x 105 Mpc d. 114 Mpc e. 8.75 x 10-3 Mpc