Which of the following is true of stony meteorites?
A) They are silicate masses.
B) They are a type of achondrite.
C) They are mainly composed of iron.
D) They are mainly composed of nickel.
A
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Compute the average emittance of anodized aluminum at 100°C and 650°C from the spectral curve. Assume ?? = 0.8 for ? > 9 ?m
GIVEN
The spectral curve for anodized aluminum
FIND
The average emittance (?) at (a) 100°C = 373 K, and, (b) 650°C = 923 K
SKETCH
PROPERTIES AND CONSTANTS
the Stephan-Boltzmann constant (?) = 5.67 10–8 W/(m2 K4)
A photon of wavelength 18.0 pm is scattered through an angle of 120° by a stationary electron. What is the wavelength of the scattered photon? (mel = 9.11 × 10-31 kg, h = 6.626 × 10-34 J ? s, c = 3.00 × 108 m/s)
A) 21.6 pm B) 22.9 pm C) 20.4 pm D) 19.2 pm E) 24.1 pm
Astronomers believe that many satellites of the Jovian planets were ________.
A. formed by collisions with other objects B. formed by fission C. formed from planetesimals orbiting the growing planet and accreting into larger bodies D. formed elsewhere in the Solar System and were later captured by Jupiter's gravitational pull
Jack rides a bicycle northward at 12 mph. Jill rides southward on the same road at 12 mph. As they pass each other
A) their speeds are identical and their velocities are identical. B) their speeds are identical but their velocities are different. C) their speeds are different but their velocities are identical. D) their speeds are different and their velocities are different. E) theoretical physics predicts, surprisingly enough, that they will turn into giant frogs.