Hydrogen should be a more useful coolant than water because its specific heat is greater. Explain why this is not the case in practice
What will be an ideal response?
What is really important for the coolant is the heat capacity. The specific heat is
important because that allows us to distinguish more useful materials that can act as
coolants. The mass of hydrogen is so much less than that of water, say, that hydrogen is not
very good as a practical coolant.
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What is the name of the brown disk rotating around the protostar in the following image?
Choose one: A. stellar disk B. planetary disk C. protoplanetary disk D. protostellar disk
A vertical pipe, closed at the bottom end, is filled to a depth of 1.00 m with water and then an amount of oil of density 
is added to make the total depth 2.00 m. The oil and water don't mix with the oil floating on top of the water. What is the increase in pressure at the bottom end of the pipe as a result of adding the fluids?
What will be an ideal response?
Intensity: A light source radiates 60.0 W of single-wavelength sinusoidal light uniformly in all directions. What is the amplitude of the electric field of this light at a distance of 0.400 m from the bulb? (?0 = 8.85 × 10-12 C2/N ? m2, ?0 = 4? × 10-7 T ? m/A, c = 3.00 × 108 m/s)
A. 162 N/C B. 212 N/C C. 82.1 N/C D. 150 N/C E. 52.9 N/C
Where do the photons in the cosmic background radiation originate?
A) the moment of the Big Bang B) the end of the Planck era C) during the era of nucleosynthesis D) the end of the era of nuclei E) during the era of galaxy formation