A container having a volume of 1.0 m3 holds 5.0 moles of helium gas at 50°C. If the helium behaves like an ideal gas, the average kinetic energy per molecule is
a. 6.7 × 10^-20 J.
b. 1.0 × 10^-21 J.
c. 1.0 × 10^-20 J.
d. 6.7 × 10^-21 J.
e. 1.3 × 10^-20 J.
D
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The theory of dark energy tells us that
A) empty space is seething with a form of energy. B) there is a force that behaves like an anti-gravity. C) there is still much to learn about this universe. D) All of the above.
Calorimetry: A 400-g block of iron at 400°C is dropped into a calorimeter (of negligible heat capacity) containing 60 g of water at 30°C. How much steam is produced? The latent heat of vaporization of water is 22.6 × 105 J/kg and its specific heat capacity is 4186 J/kg ? K. The average specific heat of iron over this temperature range is 560 J/kg ? K.
A. 22 g B. 33 g C. 42 g D. 54 g E. 59 g
The temperature of a protostar can reach 1,500 K but they are very hard to detect in visible wavelengths because of their low luminosity and because they are surrounded by dust.
Answer the following statement true (T) or false (F)
Both protons and neutrons (and their anti-particles) froze out:
A) after 10-43 seconds, at the Planck Era. B) at 1032 K, at the end of the Inflationary Era. C) at 1013 K, about .0001 seconds after the Big Bang. D) after about a minute of expansion. E) about 50,000 years after the Big Bang.