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A device is needed to accelerate a 3000-lb vehicle into a barrier with constant velocity, to test its 5 mph bumpers. The vehicle will start at rest, move forward, and have constant velocity for the last part of its motion before striking the barrier with the specified velocity. Design a cam-follower system to do this. The vehicle will leave contact with your follower just prior to the crash.
The data listed below are claimed for power cycles operating between hot and cold reservoirs at 1000 K and 400 K, respectively. For each case determine whether such a cycle is in keeping with the first and second laws of thermodynamics.
Prove that there do not exists three irrational numbers so that no matter how we choose two of them, their sum is always rational. Let k and n be positive integers satisfying 1
If 4 W are being dissipated in circuits mounted to the back surface of the chip, what is the steady-state temperature difference between back and front surfaces?
Briefly describe the three absorption mechanisms in nonmetallic materials.
a certain ceramic has a fracture toughness of kic of 5 mnm32. a batch of samples of this material contains surface
The system is at rest in the position shown, with the 12-lb collar A resting on the spring (k = 20 lb/ft), when a constant 30-lb force is applied to the cable. What is the velocity of the collar when it has risen 1 ft? The collar is attached to th..
A hydraulic cylinder has a piston diameter of 2.2 inches, a fluid pressure of 1100 psi, a flow rate of 132 cubic inches per minute, and a stroke of 10.5 inches. Find the force and the velocity generated by the piston.
The rigid tank in the figure has a volume of 60 liters and initially contains a two-phase liquid vapor mixture of H2O at a pressure of 15 bars and a quality of 20%. As the tank contents are heated, a pressure-regulating valve keeps the pressure const..
a spring is stretched in 1.5 in. by a 4 lb weight. let the weight be pulled down 3 in. below the equilibrium level nd
considering a river flowing toward a lake which is 40 m below. it is known that the river flows at a constant velocity
Outdoor design conditions: modeling of weather conditions (temperature, wind speed, solar radiation) and convective heat transfer coefficient. Methods of using solar energy to air-conditiong
a 4-ft concrete post is reinforced with four steel bars each with a 34 in. diameter. knowing that e of steel 29x106 psi
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