Which of the following is true of redshift?
A) Radiation that comes from great distance has tremendous redshift.
B) Radiation from the hot gas of the big bang is calculated to have a redshift of about 10.
C) The redshifts of different galaxies imply that these galaxies are moving toward each other.
D) The redshifts of the most faint and distant galaxies known to date are about 1100.
A
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A damped oscillator is released from rest with an initial displacement of 10.00 cm. At the end of the first complete oscillation the displacement reaches 9.05 cm. When 4 more oscillations are completed, what is the displacement reached?
A. 7.41 cm B. 6.71 cm C. 6.07 cm D. 5.49 cm E. 5.25 cm
The Doppler effect due to motion of excited atoms in a glowing gas tends to make the spectral lines slightly
A) thicker. B) thinner. C) more numerous. D) none of the above
As the air cools at night the relative humidity usually __________
Fill in the blank(s) with correct word
A machine part consists of 0.10 kg of iron (of specific heat 470 J/kg ? K ) and 0.16 kg of copper (of specific heat 390 J/kg ? K). How much heat must be added to the gear to raise its temperature from 18°C to 53°C?
A) 3800 J B) 4400 J C) 4000 J D) 910 J