Which of the following results shows the validity of the relativistic effect of time dilation?
A) the detection of gravity waves
B) bending of light near the Sun
C) the decay of muons
D) red shift in distant galaxies
E) blue shift in distant galaxies
C
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A 25.0kg propeller may be considered a 4.5m-long rod spun about its center. What final angular velocity does the propeller have if a torque of 1100Nm is applied for 1.2s?
A. 31 rad/s B. 26 rad/s C. 7.8 rad/s D. 2.6 rad/s
The voltage 8.00 sin (400t) is applied to a series RLC circuit, with R = 200 ?, L = 0.100 H, and C = 1.00 ?F. What are the impedance Z and the phase angle ??
A. 200 ?, ?37.0° B. 566 ?, +87.0° C. 2470 ?, ?85.4° D. 2540 ?, ?88.8° E. 393 ?, ?63.0°
A wiggle in time is a
A) vibration. B) wave. C) both of these D) none of the above
Estimate the surface area of an adult human’s head.
A. 0.05 
B. 0.1
C. 0.05
D. 0.01