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- Researchers from NASA performed an experiment that will carry a land rover of 900 kg on MARS at a velocity of 90 m/s using a parachute with a diameter of 100 m. How much velocity would be needed if the experiment will be performed on EARTH carrying 10 kg mass? Let the mass density of air on MARS be 0.2 kg/cu.m. The mass density of air on EARTH is 1.225 kg/cu.m.You are an astronaut exploring a new planet in a distant solar system. This planet has an atmospheric pressure of 1000 mm Hg at sea level. The oxygen content of the planet’s air is 25%. What is the partial pressure of oxygen on this planet at sea level?Mars atmosphere is only a few percent of the pressure of Earth's atmosphere. The Earth and Mars have similar surface temperatures at mid-day. Mars' atmosphere is 95% carbon dioxide, and would have an average molecular weight of about 44 AMU (atomic mass units). The Earth's atmosphere is mostly nitrogen with some oxygen, carbon dioxide, and argon. Its average molecular weight is therefore much less, at 28.9 AMU. Also on Mars the mean adiabatic index γ is about 1.1 compared to 1.4 for air on Earth. Since the speed of sound in dry air at Earth's surface is about 331 m/s, what would you expect the speed of sound to be on Mars? About 270 m/s because of Earth's atmosphere having less mass per molecule About 240 m/s because of the lower γ and higher molecular weight of Mars atmosphere. Very low because of Mars low atmospheric pressure The same as on Earth since the temperature is about the same.
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