What is the scale height of Earth's atmosphere if you assume it is all nitrogen molecules and take the temperature to be 300 K? This is of course a rough estimate, but with it describe what happens to the atmosphere the farther out it is from Earth's surface. Is the definition of the edge of space at 100 km reasonable?
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5. What is the scale height of Earth's atmosphere if you assume it is all nitrogen molecules and take the temperature to be 300 K? This is of course a rough estimate, but with it describe what happens to the atmosphere the farther out it is from Earth's surface. Is the definition of the edge of space at 100 km reasonable?
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- 1. Would air at the same temperature feel the same? Why or why not? 2. Would your perceptions have changed if the cold water was 0° C and the warm water was 80°C? 3. . Why would it be important to be able to perceive the difference between 45°C and 80°C?For this problem, we want to estimate the answer, so our assumptions may be a little unrealistic. Suppose we want to estimate how much air we need to send to a space station, assuming we cannot recycle air. Suppose four astronauts are in a spherical space station. If each of them typically breathes about 500 cm³of air with each breathe, and take 15 breathes per minute (average resting value): a. What is the volume of air you would need in the space station if these four astronauts stayed for a full year? b. If the density of air is 1.25 kg/m³ and it costs (thanks to SpaceX) a mere $100/kg to send objects to the space station, how much money would the astronaut air supply cost?2. An aluminum pot is left outdoors in the hot sun. As the pot’s temperature increases, which of the following statements about the inner and outer circumferences of the pot is true? A. Both the outer and the inner circumferences will increase. B. The outer circumference will increase, but the inner circumference will not change. C. The outer circumference will increase, but the inner circumference will decrease. D. The outer circumference will not change, but the inner circumference will decrease.
- HW1. Due: 02/08/2024. 1. The density of dry air at p = 1.0 bar and T =300 K is 1.161 kg/m³. Assuming it consists entirely of N₂ and O₂ and using the ideal gas law, determine the amount of each gas in moles in a volume of 1 m³ and their mole fractions. 2. (a) Calculate the amount of gas in moles per cubic meter of atmosphere at p = 1 atm and T = 298 K using the ideal gas equation. (b) The atmospheric content of CO₂ is about 360 ppmv (parts per million by volume). Assuming a pressure of 1.00 atm, estimate the amount of CO₂ in a 10.0 km layer of the atmosphere at the surface of the earth. The radius of the earth is 6370 km. (The actual amount of CO₂ in the atmosphere is about 6.0 x 1015 mol.) 3. The van der Waals parameter b is a measure of the volume excluded due to the finite size of the molecules. Estimate the size of a single molecule from the data given below. STATES OF MATTER AND THE VAN DER WAALS EQUATION Table 1.1 Van der Waals constants a and b and critical constants T.. p, and V…1. Which of the following do you expect to be periodic? Explain why in each case. a) The rhythm of the human heart, at rest, over time. b) The number of passenger cars purchased annually in Ontario from 1990 to 2000. c) The rise and fall of sea levels created by low and high tide, respectively. d) The average monthly temperature in your community, recorded each month for five years.#5. RUSH
- 5) In the Swiss Alps, the air pressure is relatively low due to the high elevation. Assuming an air pressure of 75 kPa and a temperature of 4°C, how many air molecules will there be in a 1 liter (10-3 m³) bottle? a) 1 x 1022 b) 2x 1022 c) 3 x 1022 d) 4 x 1022 e) 5 x 1022 f) 6 × 1022 6) An alphorn plays a sustained tone at 29 Hz. A second, smaller alphorn produces 120 beats per minutes when played with the 29 Hz instrument. What is the frequency of this second alphorn? a) 2 Hz b) 27 Hz c) 29 Hz d) 31 Hz e) 120 Hz f) 149 Hz Short Answer Question Model an alphorn as an open-closed pipe with a first harmonic (m=1) frequency of 29 Hz. . Sketch the first (m=1) harmonic showing it at two different times. ⚫ Determine the wavelength (in m) of the first harmonic. . What is the length of the pipe (in m)? ⚫ Calculate the frequency (in Hz) of the next two harmonics.Q4: When you are sick your body temperature may be 39.0oC, compared to normal body temperaturegiven by 36.8oC. It was observed that body increased 0.525 MJ of heat energy. Calculate your mass? Takespecific heat of human body as Chaman=3470 J/kgoC. Human body cannot survive without sufficient watercontent in body. Justify your opinion based on scientific knowledge. If you replace water content of bodywith some other liquid, what changes you can observe?2. A thermometer is removed from a room where the temperature is 70°F and is taken outside, where the air temperature is 10°F. After half a minute the thermometer reads 50°F. What is the reading of the thermometer at t = 1 minute? How long will it take for the thermometer to reach 15°F?