The average size of a white dwarf is about the same size as the Earth
Indicate whether the statement is true or false
T
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Radioactive Decay: Americium-243 has a decay constant of 9.39 × 105 years-1. How long will it take for a sample of americium-243 to lose one-third of its nuclei?
A. 2960 s B. 10.6 × 103y C. 4.32 × 103 y D. 6.44 × 103 y E. 7.84 × 103 y
Determine the rate of heat transfer per meter length to a light oil flowing through a 2.5 cm-ID, 60 cm-long copper tube at a velocity of 0.03 m/s. The oil enters the tube at 16°C and the tube is heated by steam condensing on its outer surface at atmospheric pressure with a heat transfer coefficient of 11.3 kW/( m2 K). The properties of the oil at various temperatures are listed in the accompanying tabulation
GIVEN
• Oil flowing through a copper tube with atmospheric pressure steam condensing on the outer surface
• Oil properties listed above
• Inside diameter (D) = 2.5 cm = 0.025 m
• Tube length (L) = 60 cm = 0.6 m
• Oil velocity (V) = 0.03 m/s
• Inlet oil temperature (Tb,in) = 16°C
• Heat transfer coefficient on outside of pipe ( ,c o h )= 11.3 kW/(m2 K)
FIND
• The rate of heat transfer (q) to the oil
ASSUMPTIONS
• Steady state
• The thermal resistance of the copper tube is negligible
• Constant wall temperature
• The tube wall is thin
SKETCH
PROPERTIES AND CONSTANTS
At atmospheric pressure, steam condenses at a temperature (Ts) of 100°C.
You are holding your physics book, pushing upwards on it with the palm of your hand. The reaction to the weight of the book is the force on __________ by __________
Fill in the blank(s) with correct word
The number density of conduction electrons in a metal can be found from the density ? of the metal, the mass per mole M of the metal, the number of conduction electrons per metal atom, and Avogadro's number NA. If we assume one conduction electron per atom, which of the following gives the number density of conduction electrons for a given metal?
a. NA ?M b. NA ? /M c. NA M /? d. NA /?M