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Just before it lifts off, a 10,500 kg airplane is traveling at 60 ft/s. What is the power actually tranferred by the plane knowing that the plane is the object being accelerated?
if the coefficient of kinetic friction between the package and the floor is .3, determine: energy stored in the spring when the object stops.
What is the CW, when i=10% per year, of $1,500 per year, starting in year one and continuing forever; and $10,000 in year five, repeating every four years thereafter, and continuing forever?
Determine the number of automobiles with PremAir catalyst treated radiators needed to reduce the ozone concentration in an urban area by 10%.
A system consists of 2 kg of carbon dioxide gas initially at state 1, where P1 = 100 kPa, T1 = 300 K. Calculate the heat transfer for each process in kJ
Estimate the land area required to grow willow that would provide 1 GW of power in a region where the annual solar radiation is 1500 kW-h/m2.
India has a land area of 2.97 x 106 km2, 57% of which is cropland. If 5% of the cropland were dedicated to producing jatropha plants, estimate the annual production of biodiesel.
The mass flow rate of the refrigerant is 450 kg/hr. A separate stream of air enters the heat exchanger at 17°C, 1 bar and exits at 42°C, 1 bar. Determine the mass flow rate of the air.
Determine (a) the rate of steam production, (b) the rate of exergy destruction in the heat exchanger, and (c) the second-law efficiency of the heat exchanger.
Sketch the cycle on a T-s diagram with respect to saturation lines and determine (a) the rate of the heat input to the working fluid, in kW, (b) the rate of the heat rejected from the working fluid,
Determine the total exergy destruction associated with the Brayton cycle, assuming a source temperature of 1800 K and a sink temperature of 310 K.
The operating reflux ratio is 3.0. Assume that Raoult's law applies and use vapor-pressure data from Problem 11.7-3. Calculate the following: Composition and amounts of distillate and bottoms for a
If the mass is displaced by 10mm from its equilibrium position and released, for the resulting vibration, calculate the frequency of vibration and maximum velocity of mass during the vibration.
Estimate the screw torque erquired to raise the load. If collar friction is eliminated, what minimum value of thread coefficient of friction is needed to prevent the screw from overhauling.
A pressure gauge measures a pressure downstream from the contraction of P2=100kPa. What force does the water exert on the area of pipe contraction?
You are requiredto heat treat samples of Al 2024 to a T6 condition but you don't know what heat treating schedule to use.
Determine the total electrical work the heat pump can consume on that day. If the heat pump consumes 6.6kW of power while operating, how long the heat pump ran on that day?
Estimate the design-stage uncertainty in determining the voltage drop across an electric heating element. The heater has a nominal resistance of 30 Ohms and a power rating of 500 W.
Stoichiometrically, how many kg of methanol are required for each kg of vegetable oil. If the methanol were directly as fuel energy would be released.
How wide must the canal be at harvesting end How long must the canal be? How much energy is harvested per day (express this in GJ and in barrels of oil)?
Velocity at the moment is V=5.18 m/s, density p=6.13 kg.m^3. Assume air inside the container is uniform everywhere, calculate the density change rate at the moment.
Absolute Pressure is known at both inlet and outlet , P1=168,600 Pa, P2=121,700 Pa. Calculate the force on the flange that mounts the horizontal section of the pipe.
Cconstant specific heats for air at room temperature, determine (a) the velocity of the exhaust gases, (b) the propulsion power developed, and (c) the rate of fuel consumption.
The air is now heated to a final state of 0.45 m^3 and 800 kPa. Determine (a) the total work done by the air and (b) the work done against spring.
If the temperature of the balls drops to 850 degrees celcius propr to quenching, determine the rate of heat transfer from the balls to the air.