Two waves travel simultaneously through the same medium. The first wave is described by y1(x,t) = (2.00 cm)cos[kx-?t] and the second wave by y2(x,t) = (3.00 cm)cos(kx-?t+?). If the resulting wave has an amplitude 4
00 cm, what is a possible value of ?? A)
0.782 rad
B)
0.250 rad
C)
0.644 rad
D)
0.833 rad
E)
1.32 rad
E
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Identify a true statement about Venus
A) It is the largest planet in the Solar System. B) It is the least luminous object in the sky. C) It is more than 60 million miles away from the Sun. D) It generates its own energy by nuclear fusion.
The horizontal cross section of an industrial chimney is shown in the accompanying sketch. Flue gases maintain the interior surface of the chimney at 300°C and the outside is exposed to ambient temperature of 0°C through a heat transfer coefficient of 5 W/(m2 K). The thermal conductivity of the chimney is k = 0.5 W/(mK). For a grid spacing of 0.2 m, determine the temperature distribution in the chimney and the rate of heat loss from the flue gases per unit length of the chimney.
GIVEN
Chimney with hot flue gases inside, ambient temperature outside
FIND
(a) Temperature distribution in the chimney
(b) Rate of heat loss from the flue gases per unit length
ASSUMPTIONS
Steady state conditions
Neglect radiation heat transfer
SKETCH
Time Dilation: Observer A sees a pendulum oscillating back and forth in a relativistic rocket and measures its period to be TA. Observer B moves along with the rocket and measures the period of the pendulum to be TB. What is true about these two time measurements?
A. TA > TB B. TA = TB C. TA < TB D. TA could be greater or smaller than TB depending on the direction of the motion.
If the average density of the universe is less than the critical density, the Universe is open
a. True b. False Indicate whether the statement is true or false