The least energy required to produce forced vibrations in an object occurs
A) below its natural frequency.
B) at its natural frequency.
C) above its natural frequency.
D) none of the above
Answer: B
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In what way is electric charge related to photons?
A) Photons are electrically-charged particles. B) They are not related at all. C) Electrically-charged particles interact by exchanging photons. D) Photons interact by exchanging electrically-charged particles. E) Electrically-charged particles are made of photons.
The momentum of an object remains the same unless an unbalanced force acts on it.
a. true b. false
Motion in a circle at constant speed is motion with
a. constant acceleration. b. constant velocity. c. both of the above d. none of the above
A balloon of negligible mass is filled with 300 m3 of helium. How big a payload can the balloon lift? (The density of air is 1.29 kg/m3; the density of helium is 0.18 kg/m3.)
a. 150 kg c. 333 kg b. 300 kg d. 444 kg