A 20-g bullet moving at 1000 m/s is fired through a one-kg block of wood emerging at a speed of 200 m/s. If the block had been originally at rest and is free to move, what is its resulting speed?
a. 800 m/s
c. 16 m/s
b. 80 m/s
d. 8 m/s
C
You might also like to view...
LC Circuits: What capacitance is needed in series with a 3.7-mH inductor so the circuit will oscillate at a frequency of 1000 Hz?
A. 0.15 mF B. 15 ?F C. 6.8 ?F D. 0.015 ?F
The greenhouse effect makes Earth warmer than it would be otherwise by about
A) 30 K. B) -16 K. C) 15 K. D) There is no greenhouse effect.
The four visible colors emitted by hydrogen atoms are produced by electrons:
a. that start in the ground state. c. that end up in the level with n = 2. b. that end up in the ground state. d. that start in the level with n = 2.
A weak acid is added to a concentrated solution of hydrochloric acid. Does the solution become more or less acidic?
A) More acidic, since there are more hydronium ions being added to the solution. B) Less acidic, since the solution becomes more dilute with a less concentrated solution of hydronium ions being added to the solution. C) No change in acidity, since the concentration of the hydrochloric acid is too high to be changed by the weak solution. D) Less acidic since the concentration of hydroxide ions will increase.