Phase Angles: In the circuit shown in the figure, the 60-Hz ac source has a voltage amplitude of 120 V, the capacitive reactance is 800 ?, the inductive reactance is 300 ?, and the resistance is 560 ?. What is the phase angle?
A. -42°
B. +42°
C. -69°
D. +69°
E. -21°
Answer: A
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Work-Energy Theorem: A 4.0 kg object is moving with speed 2.0 m/s. A 1.0 kg object is moving with speed 4.0 m/s. Both objects encounter the same constant braking force, and are brought to rest. Which object travels the greater distance before stopping?
A. the 4.0 kg object B. the 1.0 kg object C. Both objects travel the same distance. D. It cannot be determined from the information given.
Which of the following types of Universe has no center and no edge?
a. closed b. flat c. open d. All of the other choices are correct.
What do we call the tendency of a body at rest to remain at rest or a body in motion to remain in motion?
A. gravity B. inertia C. the tendency of a person to stay in bed in the morning D. the "action-reaction" law
If energy is released when the parts of a system are allowed to disperse to infinity, its binding energy is
A. Positive. B. Negative. C. Zero. D. Not defined in such a case.