10. (15points total) At some altitude above the Earth's surface, the density of air molecules is...
Forty miles above Earth's surface the temperature is -23 °C, and the pressure is only 0.20 mm Hg What is the density of air (molar mass - 29.0 g/mol) at this altitude?
At a height of 302 km above the Earth's surface, an astronaut finds that the atmospheric pressure is about 1.22E-8 mmHg and the temperature is 416 K. How many molecules of gas are there per milliliter at this altitude? (Enter the number of molecules, with no units.)
A 600 kg satellite is in a circular orbit at an altitude of 475 km above the Earth's surface. Because of air friction, the satellite eventually falls to the Earth's surface, where it hits the ground with a speed of 2.50 km/s. How much energy was transformed into internal energy by means of air friction? 1.88e10
1. For the earth, an estimate of the variation of pressure with altitude above the surface of the earth is made for a gas of molecular weight, M, assuming the atmosphere is isothermal, the variation of g with altitude is negligible, and that the atmosphere behaves like an ideal gas. A significant error in this estimate arises from the assumption that the temperature of the atmosphere, T, is isothermal instead of decreasing with altitude. This decrease with altitude y in...
Calculate the mean free path of air molecules at a pressure of 4.50×10−13 atm and a temperature of 292 K. (This pressure is readily attainable in the laboratory.) Model the air molecules as spheres with a radius of 2.00×10−10 m. λλ = m
At what frequency would the wavelength of sound in air be equal to the mean free path of oxygen molecules at 1.3 atm pressure and -2.0°C? Take the diameter of an oxygen molecule to be 5.7 × 10-8 cm and the speed of sound to be 320 m/s.
At what frequency would the wavelength of sound in air be equal to the mean free path of oxygen molecules at 1.3 atm pressure and -0.75°C? Take the diameter of an oxygen molecule to be 4.8 x 10-8 cm and the speed of sound to be 350 m/s.
A and B Part A At the surface of Mars the atmosphere has average pressure 6.0 x 10' Pa and average temperature -63°C. What is the mean free path of atmospheric molecules (assumed to be spheres of radius 2.0 x 10m ) at the surface of Mars? Express your answer with the appropriate units. x = 468 K Submit Previous Answers Request Answer X Incorrect; Try Again; 5 attempts remaining Part B How many times greater is your answer in...
A bubble forms on the ocean floor far away from the coast. Assume the density of the salt water is 1.05 g/cm3, and that the ocean is 0.600 km deep at this point. The pressure in the bubble is equal to the pressure in the surrounding water. a) What is the absolute pressure (in Pa) in the water at this depth? Assume that the air above the Ocean is at a pressure of 1.013 x 105 Pa. Be careful with...
An air bubble has a volume of 1.6 cm when it is released by a submarine 120 m below the surface of a freshwater lake. What is the volume of the bubble (in cm) when it reaches the surface? Assume that the temperature and the number of air molecules in the bubble remain constant during the ascent. (The density of water is 1,000 kg/m”.) Hint V= cm3