The frost line of the solar system was located approximately between
A) the Sun and the present-day orbit of Mercury.
B) the present-day orbits of Mercury and Venus.
C) the present-day orbits of Mars and Jupiter.
D) the present-day orbits of Venus and Earth.
E) the present-day orbits of Uranus and Neptune.
C) the present-day orbits of Mars and Jupiter.
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A heat exchanger wall consists of a copper plate 2 cm thick. The heat transfer coefficients on the two sides of the plate are 2700 and 7000 W/( m2 K), corresponding to fluid temperatures of 92 and 32°C, respectively. Assuming that the thermal conductivity of the wall is 375 W/ ( m K), (a) compute the surface temperatures in °C, and (b) calculate the heat flux in W/ m2.
GIVEN
• Heat exchanger wall, thickness (L) = 2 cm = 0.02 m
• Heat transfer coefficients
? hc1 = 2700 W/(m2 K)
? hc2 = 7000 W/(m2 K)
• Fluid temperatures
? Tf1 = 92°C
? Tf2 = 32°C
• Thermal conductivity of the wall (k) = 375 W/( m K) FIND (a) Surface temperatures (Tw1, Tw1) in °F (b) The heat flux (q/A) in W/m2. ASSUMPTIONS
• One dimensional heat transfer prevails
• The system has reached steady state
• Radiative heat transfer is negligible
SKETCH
Which of the following correctly describes how light will be affected as it tries to escape from the vicinity of a massive object like a black hole?
A) Light doesn't have mass; therefore, it is not affected by gravity. B) The light will be redshifted. C) The light will be blueshifted. D) The visible light will be redshifted, but higher frequencies, such as x-rays and gamma rays, will not be affected.
The colorful effects that we see when viewing a compact disc (CD) are due to
A. The different colors embedded in the CD B. The absorption of certain colors C. The close spacing of the tracks which act as a diffraction grating
The slope of a velocity vs. time graph is the acceleration
a. True b. False Indicate whether the statement is true or false