12:55 pm Wed 28 Aug Engineering 5th year Q Home Insert Draw View A Text Mode Lasso Select Insert Space ICS 03: The temperature of air inside a hot air balloon can reach up to 100°C. This temperature change causes the density of air inside the balloon to be 0.95 kg/m³. If the air outside the balloon is 20°C with Pair = 1.204 kg/m³ What is the required volume of balloon to lift a 2 kN carriage + canvas and 4 kN worth of people? HINT: Draw a FBD and include the weight of air inside the hot air balloon.

31. A uniformly heated square plate of 2 ft × 2 ft is exposed to cold air at 80 F. The heater output remains at a constant value of 1 kW. Air, at atmospheric pres- sure, flows over the plate at a velocity of 16.5 ft/s. Find the average temperature of this plate. [Ans.: - 513 F].

Consider a column of a planet's atmosphere. The planet's atmosphere is a compressible ideal gas at rest that obeys the polytropic relation Po %3D 3/2 Po 3/2 where pis pressure and pis density. Here, p, and P, are the values of pressure and density, respectively, at the planet's surface. Take z (altitude) to be positive upward with z=0 at the surface, take R to be the gas constant for the planet's atmosphere, and take g to be the downward acceleration due to gravity. a) Starting from hydrostatic balance and the polytropic relation above, derive an expression for the pressure field, p(z), in terms of the given parameters. Leave all parameters except the polytropic index as algebraic. b) Derive an expression for the density field, p(z), in terms of the given parameters. Leave all parameters except the polytropic index as algebraic. c) Derive an expression for the temperature field, T(z), in terms of the given parameters. Leave all parameters except the polytropic index as algebraic.

/Asman/Downloads/Energy%20Methods%201%20CHALLENGE.pdf - CD A @Y The 200-mm-diameter gas gun is evacuated on the right of the 8-kg projectile. On the left of the projectile, the tube contains gas with pressure po = 1 x 105 Pa (N/m²). The force F is slowly increased, moving the projectile 0.5 m to the left from the position shown. The force is then removed and the projectile accelerates to the right. If you neglect friction and assume that the pressure of the gas is related to its volume by PV = constant, what is the velocity of the projectile when it has returned to its original position? Gas Projectile F 1 m

thermodynamics

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Q2 please

Calculate the mass of air (in kg) contained within a room 10 m long, 8 m wide, and 3 m high. Assumeatmospheric pressure and temperature of 79,501 N/m2 and 20°C, respectively.

thermodynamics