The graph shows 
versus t for an object moving along straight line. What is the average velocity from t = 0 to t = 11 s?
A. 25 
B. 36
C. 30
D. 21
A. 25
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A sinusoidal electromagnetic wave is propagating in vacuum. At a given point P and at a particular time, the electric field is in the +x direction and the magnetic field is in the -y direction. (a) What is the direction of propagation of the wave?
(b) If the intensity of the wave at point P is what is the electric field amplitude at that point? (c = 3.00 × 108 m/s, ?0 = 4? × 10-7 T ? m/A, ?0 = 8.85 × 10-12 C2/N ? m2) What will be an ideal response?
A guitar string is fixed at both ends. If you tighten it to increase its tension
A) the frequencies of its vibrational modes will increase but its wavelengths will not be affected. B) the wavelength increases but the frequency is not affected. C) both the frequency and the wavelength increase.
The shortest-daylight day for people in the Northern Hemisphere at latitudes greater than 30°N occurs at the
a. summer solstice. b. vernal equinox. c. winter solstice. d. autumnal equinox.
The volume holding 0.63 mole of an ideal gas is compressed to 1/4 of its original volume by a piston. At the same time the pressure of the gas triples. If the original absolute temperature of the gas was T, that is the new temperature after compression?
a. 4/3T c. 0.63(3/4T) b. 3/4T d. 0.63(4/3T)