The position of a 0.64-kg mass undergoing simple harmonic motion is given by x = (0.160 m) cos (pt/16). What is its position at t = 6.0 s?
a. 0.160 m
c. 0.061 m
b. 0.159 m
d. 0.089 m
C
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The model we have constructed in this chapter neglects feedback effects that might accelerate or brake the warming. Scientists now predict that the Arctic Ocean will be ice-free in the summer by as early as 2020 (due to increased temperatures in the Arctic). Less ice will mean that the Arctic will reflect less visible light back into space. Will this accelerate or brake the warming compared to the predictions of the model in the text?
A. Accelerate B. Brake C. No change
Suppose you throw an apple horizontally. Neglecting air resistance, just after you release the apple from your hand, the net force on the apple is
A) zero. B) directed horizontally forward. C) directed horizontally backward. D) directed downward. E) directed upward.
What is resonance and the conditions for resonance? Give examples
What will be an ideal response?
Suppose you sound a 1056-Hz tuning fork when you strike a note on the piano and hear 2 beats/second. You tighten the piano string very slightly and now hear 3 beats/second. What is the frequency of the piano string?
A) 1053 Hz B) 1054 Hz C) 1056 Hz D) 1058 Hz E) 1059 Hz