When it comes near a heavy nucleus, a gamma ray, which is a high energy photon, can "disappear," and in its place there will be produced an electron and a positron, which both have mass. According to special relativity, this pair production is an example of __________
Fill in the blank(s) with correct word
the equivalence of mass and energy
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My 5.0 hp mower would be equivalent to an electric mower rated at what power?
A) 2.8 W B) 0.25 KW C) 2.8 KW D) 3.7 KW E) 0.78 KW
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Answer the following statement true (T) or false (F)
A horizontal 2.5-cm-OD tube is maintained at a temperature of 27°C on its outer surface. Calculate the average heat transfer coefficient if saturated steam at 12 kPa is condensing on this tube.
GIVEN
? Saturated steam condensing on a horizontal tube
? Tube outside diameter (D) = 2.5 cm = 0.025 m
? Tube outer surface temperature (Ts) = 27°C
? Steam pressure (p) = 12 kPa
FIND
? The average heat transfer coefficient (hc)
ASSUMPTIONS
? Steady state
? Film condensation occurs
SKETCH
PROPERTIES AND CONSTANTS
From Appendix 2, Table 13, for saturated water at 12 kPa
Radio telescopes which use dishes to gather radio waves are _______ telescopes
a. reflecting b. refracting c. deflecting d. compound e. retracting