Which of the following stars has a spectrum that peaks at the highest frequency?
A) a blue star B) a red star C) a yellow star
A
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Slanting Surfaces Without Friction: A 7.5-kg stone moves up frictionless hill that slopes upward at 41° above the horizontal. If the stone has an initial velocity of 8.5 m/s at the bottom, how far (as measured along the surface of the hill) will it go before stopping?
Fill in the blank(s) with the appropriate word(s).
Most of the injuries caused by the Chelyabinsk event in 2013 were caused by
A) smoke inhalation B) UV radiation from the fireball C) glass shattered by the shock wave D) the sonic boom as the object passed through the Earth's atmosphere
Heat is added to a 2.0 kg piece of ice at a rate of 793.0 kW. How long will it take for the ice to melt if it was initially at 0.00°C? (The latent heat of fusion for water is 334 kJ/kg and its latent heat of vaporization is 2260 kJ/kg.)
A) 0.84 s B) 530,000 s C) 4.7 s D) 670 s
If the total resistance between the steam and the air (including the pipe wall and scale on the steam side) in Problem 7.36 is 0.05 m2 K/W, calculate the temperature difference between the outer surface of the inner pipe and the air. Show the thermal circuit.
GIVEN
Atmospheric flow through an annulus with steam condensing in inner tube
Diameters Inside
(Di) = 25 cm = 0.25 m
Outside (Do) = 38 cm = 0.38 m
Steam temperature (Ts) = 149°C
Air velocity (V) = 6 m/s
Total resistance between the steam and air (At Rtot) = 0.05 (m2 K)/W
Air bulk temperature (Tb) = 38°C
From Problem 7.36 heat transfer coefficient on the outer surface of the inner pipe (c h) = 25.4 W/(m2 K)
FIND
The temperature difference between the outer surface of the inner pipe and the air (?T)
ASSUMPTIONS
Steady state
Steam temperature is constant and uniform
Heat transfer to the outer surface is negligible
Air temperature given is the average air temperature
Thermal resistance of inner tube wall and condensing steam is negligible (Inner tube wall surface
temperature = Ts)
SKETCH
