Which of these has the greatest mass?
A) proton
B) electron
C) both of these
D) neither of these
Answer: A
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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
Free Fall: A toy rocket is launched vertically from ground level at time t = 0.00 s. The rocket engine provides constant upward acceleration during the burn phase. At the instant of engine burnout, the rocket has risen to 64 m and acquired an upward velocity of 60 m/s. The rocket continues to rise with insignificant air resistance in unpowered flight, reaches maximum height, and falls back to the ground. The time interval during which the rocket engine provided the upward acceleration, is closest to
A. 2.1 s. B. 2.3 s. C. 1.9 s. D. 1.7 s. E. 1.5 s.
A 300-g glass thermometer initially at 25°C is put into 200 cm3 of hot water at 95°C. Find the final temperature (in °C) of the thermometer, assuming no heat flows to the surroundings. (The specific heat of glass is 0.2 cal/g/°C.)
a. 52 b. 68 c. 89 d. 79 e. 36
A schematic of a simple laser is shown here. Which of the following are characteristics of light produced by a laser?
a. Very narrow range of wavelengths. b. Highly directional beam. c. Very intense beam. d. Light that is coherent. e. All of the above.