The only way to make sound travel faster in air is to change the air's ____________
Fill in the blank(s) with correct word
temperature
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Two infinitely large black plane surfaces are 0.3 m apart and the space between them is filled by an isothermal gas mixture at 811 K and atmospheric pressure consisting of 25% CO2, 25% H2O, and 50% N2 by volume. If one of the surfaces is maintained at 278 K and the other at 1390 K respectively, calculate
(a) the effective emissivity of the gas at its temperature
(b) the effective absorptivity of the gas to radiation from the 1390 K surface
(c) the effective absorptivity of the gas to radiation from the 278 K surface
(d) the net rate of heat transfer to the gas per square meter of surface area
GIVEN
Two infinitely large black plane surfaces with an isothermal gas mixture between them
Distance between surfaces (s) = 0.3 m
Gas mixture temperature (Tm) = 811 K
Gas mixture pressure = 1 atm
Gas contents: 25% CO2, 25% H2O, 50 % N2 by volume
Surface temperatures
T1 = 278 K
T2 = 1390 K
FIND
(a) The effective emissivity of the gas at its temperature (? mix)
(b) The effective absorptivity of the gas to radiation from A1
(c) The effective absorptivity of the gas to radiation from A2
(d) The net rate of heat transfer to the gas per square meter of surface are (qm/A)
ASSUMPTIONS
Steady state
Convection is negligible
SKETCH
Electrical forces inside a nucleus contribute to nuclear
A) stability. B) instability. C) both of these D) neither of these
A 15-turn rectangular loop of wire of width 10 cm and length 20 cm has a current of 2.5 A flowing through it. Two sides of the loop are oriented parallel to a uniform magnetic field of strength 0.037 T,
and the other two sides are perpendicular to the magnetic field. (a) What is the magnitude of the magnetic moment of the loop? (b) What torque does the magnetic field exert on the loop?
What is the kinetic energy of a 200-kg satellite as it follows a circular orbit of radius 8.0 × 10^6 m around the Earth? (Mass of Earth = 6.0 × 10^24 kg.)
a. 5.0 × 10^9 J b. 1.0 × 10^10 J c. 1.5 × 10^10 J d. 2.0 × 10^10 J e. 2.5 × 10^9 J