One morning you discover that a tire on your auto is in need of air. As you add air to the tire, which of the following statements is true?
A. The density of the air in the tire gets smaller
B. The number of atoms of air in the tire stays the same
C. The pressure of the air in the tire increases
D. All of these statements are true
Answer: C
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Figure 4–53 shows a block (mass mA) on a smooth horizontal surface, connected by a thin cord that passes over a pulley to a second block which hangs vertically.
(a) Draw a free-body diagram for each block, showing the force of gravity on each, the force (tension) exerted by the cord, and any normal force.
(b) Apply Newton’s second law to find formulas for the acceleration of the system and for the tension in the cord. Ignore friction and the masses of the pulley and cord.
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Answer the following statement true (T) or false (F)
The angular momentum of a rotating body is conserved when
A. when the body has a constant angular acceleration. B. the shape of the body does not change. C. no net force acts on the body. D. no net torque acts on the body.
While standing at a crosswalk, you hear a frequency of 540 Hz from an approaching police car. After the police car passes, its frequency is 480 Hz. What is the speed of the police car? (speed of sound = 340 m/s)
a. 13.1 m/s c. 20.0 m/s b. 17.4 m/s d. 26.2 m/s