Consider a Cessna 172 flying at a standard altitude of 25,587 ft with a velocity of 989 ft/s. To experience the same dynamic pressure at sea level, how fast must the airplane be flying?
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Consider a Cessna 172 flying at a standard altitude of 25,587 ft with a velocity of 989 ft/s. To experience the same dynamic pressure at sea level, how fast must the airplane be flying?
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- Billboards are large outdoor hoardings that are used by advertisers. However, their large surfaces at heights off the ground means they have to withstand strong winds during their useful life span. There is a need to model and analyze a billboard stand that must be capable of supporting a 5- meter x 2-meter billboard at a height of 4 meters above the ground. The billboard will have to withstand crosswinds with speeds up to 10 m/s. Please show calculations to acquire the correct intended results for an upvote...thanks.Typical cruising speeds and altitudes for three commercial aircraft are: 1. Dash 8: Cruising speed: 500 km/h at an altitude of 4570 m. 2. Boeing 747: Cruising speed: 978 km/h at an altitude of 9150 m. 3. Concorde: Cruising speed: 2340 km/h at an altitude of 16 600 m. Find the Mach number of these three aircraft when flying at these cruise conditions. Use the properties of the standard atmosphere. In the U.S. Standard Atmosphere, the temperature in the inner portion of the atmosphere is defined by the following equation: For altitudes, H, of from 0 m (sea-level) to 11019 m: T = 288.16 – 0.00657H Above an altitude, H, of 11 019 m: T = 216.66 The altitude, H, is measured in meters and the temperature, T, in K.b)As the air sinks down, it is channeled through narrow valleys and so speeds up. In the desert the wind blows at about 5 miles per hour across an area of 100 square miles (width x height in the atmosphere). It is then squeezed into an area of just 20 square miles as it blows through narrow valleys in the mountains around Los Angeles. Assume that airflow must stay constant, what would the velocity of the air be? (2) Airflow = area * velocity c) Vegetation has to be heated up to 330 oC in order to ignite. Can you explain, using the physics we learned in class, why vegetation that contains more water does not ignite as easily as dry/dead vegetation? (2)
- Calculate the fractional decrease in volume ( ΔV/ V0 ) for seawater at 5.00 km depth, where the force per unit area is 5.00×107N/m2 .Two sites are being considered for wind power generation. In the first site, the wind blows steadily at 7 m/s for 3000 hours per year, whereas in the second site the wind blows at 10 m/s for 2000 hours per year. Assuming the wind velocity is negligible at other times for simplicity, determine which is a better site for wind power generation. Hint: Note that the mass flow rate of air is proportional to wind velocity. kWh (per m² flow area), Emax,2 yr kWh (per m² flow area) yr Emax1 = 643 = 1250Neglecting air resistance, determine to what height a vertical jet of water could rise if projected with a velocity of 30 m/s at an angle of 35º with the horizontal.
- Two sites are being considered for wind power generation. In the first site, the wind blows steadily at 7 m/s for 3000 hours per year, whereas in the second site the wind blows at 10 m/s for 1500 hours per year. Assuming the wind velocity is negligible at other times for simplicity, determine which is a better site for wind power generation. Hint: Note that the mass flow rate of air is proportional to wind velocity.Atmospheric pressure on Earth at its surface is 101 KPa (101 kilopascals or 101,000 N/m2). Which of these statements is true. If we pump out the gas in a closed container leaving only 1 billionth of the original gas, there will only be about 1000 atoms left in the container. The number of atoms or molecules in the container depends on what the gas is composed of. If we pump out the gas in a closed container leaving only 1 millionth of the original gas there will still be more than 1013 (10,000 billion) atoms per cm3 in the container. The number of atoms or molecules in the container does not depend on temperature.The record for the deepest free-dive (diving without an oxygen tank) is 253 m. What is the absolute pressure (atmospheric + water) on a diver at that depth? How many times greater is the water pressure at that depth than air pressure at sea level?
- An airplane has a mass of 2.1×106 kgkg , and the air flows past the lower surface of the wings at 81 m/sm/s . If the wings have a surface area of 1100 m2m2 , how fast must the air flow over the upper surface of the wing if the plane is to stay in the air? Express your answer to two significant figures and include the appropriate units.find Q2) is(70kpa)(h1=0.2,h2=0.4,h3=0.6)(Pig =13600kg/m3,poil=850kg/m3) the pressure at point (1) if the atmospheric pressure AIR WATER MeuryThe highest altitude ever reached by a glider is 15460m. What is the approximate air pressure at that altitude?