In an elastic collision, one ball has initial velocity v and strikes another, much less massive ball, that is initially at rest in a head-on collision. The velocity of the second ball after the collision is equal to:
A. v
B. 2v
C. v/2
D. -v
E. something else
B. 2v
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Free Fall: When a ball is thrown straight up with no air resistance, the acceleration at its highest point
A. is upward. B. is downward. C. is zero. D. reverses from upward to downward. E. reverses from downward to upward.
A pressure of 3.00 × 10^?7 mm of Hg is achieved in a vacuum system. How many gas molecules are present per liter volume if the temperature is 298 K? (760 mm of Hg = 1 atm, R = 0.082 1 L/atm/mol/K, and NA = 6.02 × 10^23)
a. 6.5E+10 b. 8.6E+16 c. 9.7E+12 d. 1.8E+9 e. 5.7E+14
When a 20-V emf is placed across two resistors in series, a current of 2.0 A is present in each of the resistors. When the same emf is placed across the same two resistors in parallel, the current through the emf is 10 A. What is the magnitude of the greater of the two resistances?
a. 7.2 W b. 7.6 W c. 6.9 W d. 8.0 W e. 2.8 W
On page 526 of your textbook, you learned that one gram of radium produces over a million times the radiation as does one gram of uranium. This means that a much larger fraction of radium atoms are undergoing radioactive decay each second than for uranium. How does the half-life of radium compare to the half-life of uranium?
a. The half-life of radium is much smaller than the half-life of uranium. b. The half-life of radium is the same as the half-life of uranium. c. The half-life of radium is much larger than the half-life of uranium. d. The information is insufficient to answer the question. e. The half-life of the radium is shorter at first, but gets longer as the radium sample is depleted.