If you draw a spacetime diagram, the worldline of an object that is traveling by you at constant speed is
A) vertical.
B) horizontal.
C) slanted.
D) curved.
E) a circle.
C
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What spectral type of star that is still around formed longest ago?
A) O B) A C) F D) K E) M
Determine the work done by 5 moles of an ideal gas that is kept at 100°C in an expansion from 1 liter to 5 liters
a. 2.5 × 10^4 J b. 1.1 × 10^4 J c. 6.7 × 10^3 J d. 2.9 × 10^3 J e. 8.4 × 10^3 J
A stationary siren emits sound of frequency 1000 Hz and wavelength 0.343 m. An observer who is moving toward the siren will measure a frequency f and wavelength ? for this sound such that
A) f > 1000 Hz and ? > 0.343 m. B) f > 1000 Hz and ? = 0.343 m. C) f > 1000 Hz and ? < 0.343 m. D) f = 1000 Hz and ? < 0.343 m.
Compared to the velocity of a 400 Hz sound, the velocity of a 200 Hz sound through air is
A) twice as great. B) the same. C) one-half as great. D) one-fourth as great. E) none of the above