A gasoline engine absorbs 2 500 J of heat and performs 1 000 J of mechanical work in each cycle. The amount of heat expelled in each cycle is
a. 1 000 J
b. 1 500 J
c. 2 000 J
d. 500 J
e. 3 000 J
b
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A simple pendulum, 2.0 m in length, is released with a push when the support string is at an angle of 25° from the vertical. If the initial speed of the suspended mass is 2.0 m/s when at the release point, what is its speed at the bottom of the swing? (g = 9.8 m/s2)
a. 2.3 m/s c. 2.8 m/s b. 2.6 m/s d. 0.5 m/s
Why doesn't a brown dwarf become a star?
A) It does not have enough mass for its core to get hot enough to start fusion reactions before degeneracy pressure prevents further collapse. B) It always has a companion star that is hotter, and therefore, the brown dwarf is more like a planet than a star. C) It does not have enough heavy elements to start fusion reactions. D) Its luminosity is not high enough to qualify as an official star.
The Big Bang produced all the observed helium that we see today.
Answer the following statement true (T) or false (F)
The Lewis symbol •X• would be characteristic of which group?
a. 2A b. 4A c. 6A d. 1A