A constant volume and mass of helium gas at 77°C is heated so that the pressure of the gas doubles. What is the new temperature of the gas in Celsius degrees?
a. 154°C
b. 273°C
c. 427°C
d. 700°C
c
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The explosion of a supernova typically leaves behind
a. a planetary nebula. b. a shell of hot, expanding gas with a white dwarf at the center. c. a shell of hot, expanding gas with a pulsar at the center. d. nothing is ever left behind.
A spherical water droplet of 1.5-mm-diameter is freely falling in atmospheric air. Calculate the average convection heat transfer coefficient when the droplet has reached its terminal velocity. Assume that the water is at 50°C and the air is at 20°C. Neglect mass transfer and radiation.
GIVEN
• A spherical water droplet freely falling in atmospheric air
• Drop diameter (D) = 1.5 mm = 0.0015 m
• Water drop temperature (Td) = 50°C
• Air temperature (T?) = 20°C FIND
• The average heat transfer coefficient at terminal velocity ( h c)
SKETCH
A 400-W computer (computer plus monitor) is turned on 8.0 hours per day. If electricity costs 10 cents per kWh, how much does it cost to run the computer annually?
A) $116.80 B) $1168.00 C) $14.60 D) $16.80 E) $146.00
What is the lowest value for n of a shell that can contain a g electron?
a. 5 c. 3 b. 4 d. 6