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The operation of this garage door is assisted using two springs AB and side members BCD, which are pinned at C. Assuming the springs are unstretched when the door is in the horizontal (open) position and ABCD is vertical, determine each spring stiffness k so that when the door falls to the vertical (closed) position, it will slowly come to a stop. Use appropriate numerical values to explain your result.
a stationary gas turbine plant operates on the brayton cycle and delivers 20000 kw to an electric generator. the
A mass of 2 kg of acetylene is in a 0.045 m3 rigid container at a pressure of 4.3 MPa. Use the generalized charts to estimate the temperature. (This becomes trial and error).
a carnot refrigerator is used for making ice. water freezing at 32 f is the cold reservoir. heat is rejected to a river
a thin-walled cylindrical gas vessel has a mean radius of 3 ft and a wall thickness of 12 in. the yield stress of the
the elevator e has a mass of 500kg and the counterweight at a has a mass of 150kg. if the motor supplies a constant
steam flows steadily through an adiabatic turbine. the inlet conditions of the steam are 10 mpa 450 c and 80 ms and the
consider a homogenous spherical radioactive material of radius ro 0.075 m that is generating heat at a constant rate of
the atmospheric pressure at a location is usually specified at standard conditions but it changes with the weather
A golf ball is driven off a tee that is elevated 30 ft above the fairway and hits the ground that is below 30 ft from the tee. The initial velocity of the ball is 120 ft/s at an angle of 40 degrees from the horizontal.
a shaft is to be designed to support the spur pinion and helical gear shown in the figure on two bearings spaced 700 mm
determine the location Yc of the centroid C of the beam cross sectional area . then compute the moment of inertia of the area about the x axis.
Space stations don't need to be round to have artificial gravity. The tethered spacecraft in the diagram to the right represents an alternative design. Put the astronauts in a passenger capsule. (Put the "spam in a can" as they say.) Tether it to a h..
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