Why is Saturn almost as big as Jupiter, despite its smaller mass?
A) Jupiter's greater mass compresses it more, thus increasing its density.
B) Saturn's rings make the planet look bigger.
C) Saturn is further from the Sun, thus cooler, and therefore less compact.
D) Saturn has a larger proportion of hydrogen and helium than Jupiter, and is therefore less dense.
E) Jupiter's strong magnetic field constrains its size.
A
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Astronauts are weightless inside the International Space Station because
A) the station and the astronauts are constantly falling toward Earth. B) the station has rockets that fire to counteract Earth's gravity. C) there is no gravity in space. D) the station is too far from Earth for gravity to be noticeable. Answer: A
Given that there are several hundred billion stars in the Milky Way Galaxy and preliminary data from exoplanet studies suggest that as many as one in five star systems may have one or more habitable planets, then a reasonable estimate for the number
of habitable planets could be about A) 100 billion or more B) 1 billion or more C) 100 million or more D) 10 million or more
During an adiabatic process, an ideal gas does 25 J of work. What is the change in the internal (thermal) energy of the gas during this process?
A) -25 J B) 25 J C) 0.00 J D) 50 J E) -50 J
Consider a situation where you carry a 20 N box up a flight of stairs, raising its elevation by 5 m. The increase of potential energy of the box is __________
Fill in the blank(s) with correct word