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Q. Using a diesel fired boiler with an efficiency of 80%.How many liters of diesel is required to produce 1000kg of steam at 120degrees Celsius from make up water at 20 degrees Celsius.given that the enthalpy of steam at 120 degrees Celsius is 2706.3kJ/kg,enthalpy of water at 20 degrees Celsius is 83.9kJ/kg, heat of combustion of diesel is 45000J/kg and density of diesel is 850kg/m3?
Q. The emissivity of tungsten is 0.35. A tungsten sphere with a radius of 1.50cm is suspended within a large evacuated enclosure whose walls are at 290K. What power input is required to maintain the sphere at a temperature of 3000K if heat conduction along the support is neglected?
A conveyor belt at a quarry lifts 2,000 kg of sand per minute up a vertical distance of 12 meters. The sand is at first at rest, then moves at a speed of 0.20 m/s along conveyor belt. What is the instantaneous power generated by this machine .
A shell, fired from a cannon, has a muzzle speed (the speed as it leaves the barrel) of 800 ft/s. The barrel makes an angle of 45o with the horizontal and, for ease; the barrel opening is assumed to be at ground level.
A tank is in the shape of an inverted cone, having height h = 2.50 m and base radius r = 0.750 m. If water is poured into the tank at a rate of 15 L/s, how long would it take to fill the tank.
Discuss briefly centripetal acceleration, the speed and the force exerted by a ball attached to a string.
What are magnitude and direction of the force
A long wire lying along the x-axis carries a current of 2.8 A in the +x direction. There is a uniform magnetic field present, given by B=0.003i + 0.004j + 0.002k, where i, j, k are the unit vectors along the cartesian coordinate axes') in units of..
A plane flies from base camp to Lake A, 300 km away in the direction 36.9° south of east. After dropping off supplies it flies to Lake B, which is 260km at 30.0° west of north from Lake A. find out the distance and direction from Lake B to the bas..
What is the frictional force
What is the greatest angle of elevation
Two insulated wires, each 2.50 m long, are taped together to form a two-wire unit that is 2.50 m long. One wire carries a current of 7A; the other carries a smaller current I in the opposite direction. The two wire unit is placed at an angle of 78..
Galaxies form by gravitational collapse of regions that are denser than average. Noting that the present day average mass density of the universe is ρ = 3 × 10-30 g/cm-3, estimate how long it takes for a galaxy to collapse.
You're carrying a 3.6-m-long, 25kg pole to a construction site when you decide to stop for a rest. You place one end of the pole on a fence post and hold the other end of the pole 35cm from its tip.
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