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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
Discharges heat to the atmosphere (20°C). For operation at steady state, calculate the theoretical minimum solar collector area required.
An airplane heading eastward is observed to be in a 20degree climb at a speed of 1200km/h. At this instant its acceleration components are 2g eastward, 5g northward, and 1.5g.
A bullet of mass 81gm and moving with a velocity of 300m/sec is fired into a log of wood and it penetrates to a depth of 10cm. If the bullet moving with the same velocity were fired into a similar p
After going through steps you got the final diameter. By drawing the rod into smaller & smaller dimensions then annealing. What should be the starting diameter of the wire be for the last step?
Determine the maximum possible volume flow rate for this pump. Neglect any changes in kinetic energy. Assume that water is an incompressible substance with a density of 1000 kg/m^3.
A sample is introduced into the chamber at 760 torr while the isolated pumps are maintained at 10-6 torr. For a 15 cm diameter opening, what force acts on the valve plate to seal it?
Two steel I-beams, each with a mass of 100 kg, are welded together at right angles and lifted by vertical cables so that the beams remain in a horizontal plane. Compute the tension in each of the c
Determine the power input, the rate of heat transfer from the compressor, and the isentropic efficiency of the compressor.
A steel pipe of 12-in outer diamer is fabricated from 1/4-in-thick plate by welding along a helix that forms an angle of 25 degrees with a plane perpendicular to the axis of the pipe.
The partition is now removed, and the water expands to fill the entire tank. Determine the entropy change of water during the process, if the final pressure in the tank is 25 kPa.
Cooling water circulates through a water jacket enclosing a housing filled with electronic components. At steady state, water enters the water jacket at 20oC and exits with a negligible change in pr