A billiard ball is moving in the x-direction at 30.0 cm/s and strikes another billiard ball moving in the y-direction at 40.0 cm/s. As a result of the collision, the first ball moves at 50.0 cm/s, and the second ball stops. What is the change in kinetic energy of the system as a result of the collision?
a. 0
b. some positive value
c. some negative value
d. No answer above is correct.
a
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You note that a particular star is directly overhead. It will be directly overhead again in:
A) 1 hour. B) 12 hours. C) 23 hours 56 minutes. D) 24 hours. E) 24 hours 4 minutes.
Sound waves in the interstellar medium
A) cannot exist at all. B) travel so slowly that they are undetectable. C) cannot be heard by human ears, but do indeed travel through the gas. D) travel extremely quickly and are therefore very loud.
A gas expands as shown in the graph. If the heat taken in during this process is 1.02 × 106 J and 1 atm = 1.01 × 105 N/m2, the change in internal energy of the gas (in J) is how much?
?
?
A. ?2.42 × 106 B. ?1.40 × 106 C. ?1.02 × 106 D. 1.02 × 106 E. 1.40 × 106
Suppose that a voltage surge produces 140 V for a moment in a 115-V line. What will temporarily be the output of a 100-W light bulb assuming its resistance does not change?
a. 170 W b. 122 W c. 67.5 W d. 148 W e. 74.1 W