The lowest A on a piano has a frequency of 27.5 Hz. If the tension in the 2.00-m string is 308 N, and one-half wavelength occupies the string, what is the mass of the wire?
A. 0.025 kg
B. 0.049 kg
C. 0.051 kg
D. 0.081 kg
E. 0.037 kg
Answer: C
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Single-Slit Diffraction: Light of wavelength 610 nm is incident on a slit 0.20 mm wide and the diffraction pattern is viewed on a screen that is 1.5 m from the slit. What is the width on the screen of the central maximum?
A. 0.34 cm B. 0.68 cm C. 0.92 cm D. 1.2 cm E. 1.5 cm
Two flanged shafts are connected by eight 18-mm bolts. The diameter of the bolt circle is 240 mm. The allowable shear stress in the bolts is 90 MPa. Ignore friction between the flange plates. The maximum value of torque T0 is approximately:
(A) 19 kN?m
(B) 22 kN?m
(C) 29 kN?m
(D) 37 kN?m
A volume of air that is compressed with no heat entering or leaving becomes
A) cooler. B) remain unchanged. C) warmer. D) none of the above
A rock attached to a string swings in a vertical circle. Which free-body diagram could correctly describe the force(s) on the rock when it is at the highest point, where
is the normal force, 
is weight, and 
is tension?
a.
b.
c.
d.
e.