"Seeds" around which galaxies, clusters and walls grew may have been ___________ before inflation and recombination
a. caused by hot dark matter
b. caused by baryons
c. the result of the separation of the electromagnetic and weak forces
d. the result of freezing water molecules shortly after the Universe became transparent to photons
e. caused by initially tiny quantum mechanical fluctuations in space-time
e
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Vision Problems: A nearsighted person has a near point of 12 cm and a far point of 17 cm. If the corrective lens is 2.0 cm from his eye, (a) what lens power will enable this person to see distant objects clearly, and (b) what then will be the new near point of his eye?
What will be an ideal response?
Suppose you discovered a galaxy with a mass-to-light ratio of 0.1 solar mass per solar luminosity. What would this measurement say about the nature of the stars in this galaxy?
What will be an ideal response?
3.00 moles of an ideal gas at a pressure of 250 kPa are held in a container of volume of 25.0 L. The ideal gas constant is R = 8.314 J/mol•K = 0.0821 L ? atm/mol ? K, and 1 atm = 1.01 x 105 Pa
The temperature of this gas is closest to A) 240°C. B) -1.0°C. C) 480°C. D) -180°C. E) -22°C.
A metal bar is used to conduct heat. When the temperature at one end is 100°C and at the other is 20°C, heat is transferred at a rate of 32 J/s. The bar is then stretched uniformly to twice its original length. If again it has ends at 100°C and 20°C, at what rate will heat be transferred between it ends?
a. 4 J/s c. 16 J/s b. 8 J/s d. 32 J/s