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As part of the new Bicycle Corps, a solider is pedaling down the road at 25 km/h, holding a missile launcher on his shoulder. The combined mass of the bicycle and the solider is 8o kg, and the singl
The data listed below are claimed for a power cycle operating between hot and cold reservoirs at 1000 K and 300 K, respectively. For each case, determine whether the cycle operates reversibly, irrev
A small bucket of water is swinging above a persons head at a constant angular speed of 10rad/s. The rope is 1 m long, and the combined mass of the bucket and the water is 4kg.
Compute the number of kilograms of hydrogen that pass through a 5-mm thick sheet of palladium having an area of 0.20 m2 at 500 oC.
In order to maintain the same values for Q and change in pressure, by what ratio should the design diameter be increased over its original value to allow for scaling and corrosion?
Assuming complete combustion and the pressure of the products is 90 kPa, determine (a) the percentage of theoretical air used and (b) the dewpoint temperature of the products.
Air contained in a piston-cylinder assembly contains air, initially at 2 bar, 300 K and a volume of 2 m^3. The air undergoes a process to a state where pressure is 1 bar, during which the pressure-v
Steel is coated with thin layer pf ceramic to help protect against corrosion. what do you expect to happen to the coating when the temperature of the steel is increased significantly? Explain.
Explain why the modulus of elasticity of simple thermoplastic polymers, such as polyethylene and polystyrene, is expected to be low compared with that of metals and ceramics.
The outlet area and velocity are 0.001 m^2 and 30m/s and the inlet velocity is 15 m/s. Determine the mass flow rate and the inlet area.
The partition is now removed, and the water expands to fill the entire tank. Determine the entropy change of water during this process if the final pressure in the tank is 40kPa.
Boron has a much lower coefficient of thermal expansion than aluminum, even though both are in the 3 B column of the periodic table. Explain, base on bonding energy, atomic size, and the energy wel
Water is sprayed radially outward over 180 degrees. the jet is in the horizontal plane. if the jet velocity at the nozzle exit is 30 ft/s, determine the direction and magnitude of hte resultant hori
The unit cells of several orthorhombic crystals are described below. What is the Bravais lattice of each and how do you know?
A tank whose volume is 0.01 m^3, initially evacuated. A pinhole develops in the wall, and the air from the surroundings at 21 degrees C, 1 bar enters until the pressure in the tank is 1 bar. If the
Cutting speed is 60m/min, chip load is 0.25mm/tooth, and depth of cut is 6.50mm. Determine (a) machining time of the operations and (b) maximum material removal rate during the cut.
A feedwater heater extracts steam from a turbine at 600 kPa and 250°C which it combines with 0.3 kg/s of liquid at 600 kPa and 150°C. The exhaust is saturated liquid at 600 kPa. Determine t
Consider an infinitely large homogeneous mixture of 235U and a moderating material. Determine the ratio of fuel-to-moderator density that will render this system critical for the moderators.
A man pushes on a 60-lb crate with a force F.The force is always directed down at a 30 degrees from the horizontal and its magnitude is increased until the crate begins to slide.
A 120 lbm base jumper (extreme parachutist) leaps from El Capitan in Yosemite National park (3000 ft vertical drop) head first. What is her terminal velocity? She plans to open her chute 350 ft from
A person weighs 180lbs at sea level. the radius of the earth is 3960 mi. what force is exerted on the person by the gravitational attraction of the earth if he is in a space station in near-earth o
A wind tunnel made of circular duct consists of a contracting nozzle, a test section in which experiments are conducted, a system of piping to recirculate the flow, and a fan to drive the air (see f
Determine the weight and cost of prepeg required to produce a hollow composite tube (Outside Diameter = 50mm, wall thickness = 5mm and, length = 4m).
A rigid, well insulated container with a volume of 2 ft^3 holds 0.12 lb of ammonia initially at a pressure of 20 lbf/in^2. The ammonia is stirred by a paddle wheel, resulting in an energy transfer t