Simple Harmonic Motion: A guitar string is set into vibration with a frequency of 512 Hz. How many oscillations does it undergo each minute?
A. 30,700
B. 8.53
C. 26.8
D. 1610
E. 512
Answer: A
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Force F (see figure) is applied at C and is directed toward A. Its magnitude is F = 15 N. A unit vector along line CA is:
(A) -0.49i + 0.81j + 0.32k
(B) -0.5li + 0.73j + 0.39k
(C) 0.58i - 0.79j + 0.49k
(D) -0.65i + 0.22j + 0.43k
The hole for a bolt in a brass plate has a diameter of 1.200 cm at 20°C. What is the diameter of the hole when the plate is heated to 220°C? The coefficient of linear thermal expansion for brass is 19 × 10-6/C°
(Express your answer to 4 significant figures.) A) 1.195 cm B) 1.125 cm C) 1.210 cm D) 1.200 cm E) 1.205 cm
Stellar paralax proves that Earth is
a. rotating. b. revolving. c. precessing. d. an oblate spheroid.
If the velocity of a bicycle rider decreases from 37.0 mi/h to 7.0 mi/h in 5.0 min, his average acceleration is
a) -6.0 mi/h/min b) -8.3 mi/h/min c) 1.7 mi/h/min d) -6.7 mi/h/min