Explain how some stars form in binary systems
What will be an ideal response?
As a molecular cloud contracts, it breaks up into fragments and can form many protostars. Gravity can pull two neighboring protostars closer together but conservation of angular momentum prevents them from directly crashing into each other and instead they can end up orbiting each other as a binary.
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After stage 3 in star formation, the protostar develops a surface better known as a(n) ________
Fill in the blank(s) with correct word
Almost all elements heavier than hydrogen and helium were made inside stars
Indicate whether the statement is true or false
Which planets exhibit retrograde motion, that is, periodically appear to reverse their direction of motion across the sky?
A. Only Mars, Mercury, and Venus B. Only Venus, Saturn, and Jupiter C. Only Mars, Jupiter, and Saturn D. Only Mars, Jupiter, and Venus E. All of the planets show retrograde motion
All things being practically equal, if the energy content in gasoline were doubled, then the distance a car should travel per liter of gasoline should
1) be no different. 2) double. 3) quadruple. If the low-energy and high-energy fuels are burned in the same time, then compared to the POWER produced by combustion of the low-energy gasoline, the power produced by the combustion of the higher-energy gasoline should 4) be no different. 5) double. 6) quadruple.