The average heat transfer per unit area is 100 W/m2 between saturated vapor R-134a and a tube. The R-134a is at 50ºC and flows at 0.5 kg/s through a 1-cm-diameter horizontal tube having average surface temperature of 20ºC. The R-134a is to be completely condensed when it leaves the tube. Estimate the tube length required, using hnfg = 205.9 kJ/kg for R-134a at 500C.
What will be an ideal response?
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An ideal spring with a spring constant of 15 N/m is initially compressed by 3.0 cm from its uncompressed position. How much work is required to compress the spring an additional 4.0 cm?
A) 0.0068 J B) 0.012 J C) 0.024 J D) 0.030 J
There are three types of collapsed, burned-out stars: black holes, neutron stars, and
A) supernova. B) quasars. C) red giants. D) X-ray stars. E) white dwarfs.
From the point of view of a muon produced high in the atmosphere, the reason it can get to the ground before it decays is because
a. relativity gives it extra time to get there. b. of the uncertainty principle. c. it is a short distance to the ground. d. relativity shortens the distance to the ground.
The bottom of a flat–bottomed aluminum boat has an area of 4.0 m2, and the boat's mass is 120 kg. When set afloat in water, how far below the water surface is the boat bottom? (water density = 1.0 × 10^3 kg/m3)
a. 0.060 m c. 0.030 m b. 0.015 m d. 0.075 m