An ionized gas is a state of matter called a __________
Fill in the blank(s) with correct word
plasma
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Conduction: A solid concrete wall has dimensions 4.0 m × 2.4 m and is 30 cm thick. The thermal conductivity of the concrete is 1.3 W/m ? K, and it separates a basement from the ground outside. The inner surface of the wall is at 18°C, and the outside surface is at 6°C. How much heat flows through the wall every hour?
A. 1.8 MJ B. 1.8 kJ C. 500 J D. 5.0 MJ E. 5.0 kJ
Liquid sodium is to be heated from 500 K to 600 K by passing it at a flow rate of 5.0 kg/s through a 5-cm-ID tube whose surface is maintained at 620 K. What length of tube is required?
GIVEN
FIND
The length of tube (L) required
ASSUMPTIONS
Surface temperature is constant and uniform
SKETCH
PROPERTIES AND CONSTANTS
for liquid sodium at the average bulk temperature of 550 K
Molecular Speeds: What is the total translational kinetic energy of the gas in a classroom filled with nitrogen at 1.01 × 105 Pa at 20.7°C? The dimensions of the classroom are 4.60 m × 5.20 m × 8.80 m. The Boltzmann constant is 1.3806503 × 10-23 J/K, R = 8.31 J/mol ? K, and NA = 6.022 × 1023 molecules/mol.
Fill in the blank(s) with the appropriate word(s).
A European sports car dealer claims that his product will accelerate at a constant rate from rest to a speed of 100 km/hr in 9.00 s. What distance will the sports car travel during the 9.00 s acceleration period? (Hint: First convert speed to m/s.)
a. 55.5 m c. 111 m b. 125 m d. 250 m