A quantity which is conserved in the collision of a car and a truck is
A. kinetic energy.
B. total momentum.
C. potential energy.
D. momentum of the truck.
E. momentum of the car.
Answer: B
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Suppose you hear a car approaching and its horn is heard as a 3037. Hz tone. After passing, you hear 2430. Hz
(a) What was the Mach number of the car? (b) What is the speed of sound if the outside temperature is 19.°C? (c) How fast was the car moving, in meters per second?
A bumper car is moving at constant velocity when another bumper car starts to push on it with a constant force at an angle of 60 degrees with respect to the first car's initial velocity. The second bumper car continues pushing in exactly that direction for some time. What is most likely to happen is that
a. the first car will stop moving. b. the first car will move in the direction of the force. c. the first car's velocity will increase in magnitude but not change direction. d. the first car's velocity will gradually change direction more and more toward that of the force while increasing in magnitude. e. the first car's velocity will gradually change direction more and more toward that of the force while decreasing in magnitude.
Red giant stars are I. more luminous than the Sun. II. larger in diameter than the Sun. III. cooler than B stars. IV. located above the main-sequence stars in the H-R diagram
a. I & II b. II & IV c. I, II, & IV d. II, III, & IV e. I, II, III, & IV
RC Circuits: An uncharged capacitor is connected in series with a resistor, a dc battery, and an open switch. At time t = 0 s, the switch is closed. Which of the graphs below best describes the potential difference V across the capacitor as a function of time t?
A. A B. B C. C D. D E. E