An electric generator
A) can create enough energy to light cities.
B) can convert mechanical energy to electric energy.
C) needs no energy source.
D) all the above
E) none of the above
Answer: B
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A string on a guitar is stretched between two points 35.0 cm apart with a tension of 65.0 N. The mass/length of the string is 0.00400 kg/m. The frequency of the mode of vibration with the lowest frequency is
A. 315 Hz. B. 276 Hz. C. 250 Hz. D. 205 Hz. E. 182 Hz.
The one theory of the early universe before the Recombination Epoch and after the Planck Epoch that was developed to resolve a conflict between observation and theory is
A) the Grand Unified Theory. B) the theory of inflation. C) the theory of nucleosynthesis. D) the theory of recombination. E) the quantum quark theory.
A series LCR AC circuit is at resonance. It contains a resistor of 16 W, a capacitor of 0.35 mF, and an inductor of 90 mH. If an effective (rms) voltage of 150 V is applied, what is the effective (rms) current when the circuit is in resonance?
a. 9.4 A c. 5.0 A b. 3.3 A d. 16.1 A
John and Linda are arguing about the definition of density. John says the density of an object is proportional to its mass. Linda says the object's mass is proportional to its density and to its volume. Which one, if either, is correct?
A. They are both wrong. B. John is correct, but Linda is wrong. C. John is wrong, but Linda is correct. D. They are both correct. E. They are free to redefine density as they wish.