Which of the following is true of planet Earth?
A) It has an atmosphere rich in water vapor.
B) It has an atmosphere that is mainly composed of oxygen.
C) It is the fourth largest planet of the Solar System.
D) It is half the size of Jupiter.
A
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Two parallel plates of infinite extent perpendicular to the page are situated relative to each other as shown in the figure. The upper plate is at 300°C and the lower plate is at 100°C. Determine the net rate of radiation heat transfer from the upper and lower plate assuming the environment is at a temperature below 100°C. Assume that both the lower surface of the upper plate and the upper surface of the lower plate are black.
GIVEN
• Two parallel plates of infinite extent perpendicular to the page.
• Upper plate temperature (T2) = 3000C
• Lower plate temperature (T1)= 1000C
• Length of the plates L1 = L2 = 2 m
• Distance between the plates (R) = 1 m
FIND
(a) Net rate of radiation heat transfer from upper and lower plate.
ASSUMPTIONS
• Lower surface of upper plate and upper surface of lower plate are black.
SKETCH
PROPERTIES AND CONSTANTS
The Stephan-Boltzmann constant (?) = 5.67 × 10–8 W/(m2 K4)
If the interplanar spacing of NaCl is 2.814 × 10?10 m, what is the predicted angle at which X-rays of wavelength 0.140 nm will be diffracted in a first-order maximum?
A. 31.3° B. 7.20° C. 20.5° D. 14.4° E. 29.8°
If WIMPs really exist and make up most of the dark matter in galaxies, which of the following is not one of their characteristics?
A) They travel at speeds close to the speed of light. B) They are subatomic particles. C) They can neither emit nor absorb light. D) They tend to orbit at large distances from the galactic center.
A 10-g bullet moving horizontally with a speed of 2.0 km/s strikes and passes through a 4.0-kg block moving with a speed of 4.2 m/s in the opposite direction on a horizontal frictionless surface. If the block is brought to rest by the collision, what is the kinetic energy of the bullet as it emerges from the block?
a. 0.51 kJ b. 0.29 kJ c. 0.80 kJ d. 0.13 kJ e. 20 kJ