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A 30-ton engine exerts a constant horizontal force of 40(10^3)-lb on a train having three cars that have a total weight of 250-tons. If the rolling resistance is 10-lb per ton for both the engine and cars, Determine how long it takes to increase the speed of the train from 20 ft/s to 30 ft/s. What is the driving force exerted by the engine wheels on the tracks?
To make strawberry jam, crushed strawberries and sugar are mixed in a 45:55 mass ratio, and the mixture is heated to evaporate water until the residue contains one-third water by mass. Calculate how many pounds of strawberries are needed to make a..
a compressor pressurizes air from 1 atm to 2.38 atm at steady state. at the entry the airs temperature is 70f whereas
a rigid tank contains 7.5 kg of saturated water mixture at 400 kpa. a valve at the bottom of the tank is now opened and
consider the ocean thermal energy conversion system given in the lecture notes. also take into consideration that
the motion of the uniform slender rod of length l0.5 m and mass m 3 kg is guided by pins at a and b that slide freely
How would you calculate the sensible heat, the latent heat, and determine the latent heat of vaporization of the water vapor in this air stream as the air is cooled from 170 F to 48 F?
a heat exchanger is a device in which heat flows between two fluid streams brought into thermal contact through a
Refrigerant R-134a vapor in a piston-cylinder assembly undergoes a constant-pressure process from saturated vapor at 800 kPa to 50 ºC.
a stationary gas turbine power plant operates on a simple ideal brayton cycle with air as the working fluid. the air
What is the force P to keep the system in equilibrium for the angles specified?
a hole in an aluminum roof panel is 2.748 cm2 in area at 0.000degc. what is the magnitude of the change to its area
a cylindrical drill with radius r1 is used to bore vertically a hole through the centre of a sphere of radius r2.a find
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