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Question: machine design by timothy h wentzell question 7...

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Machine Design by Timothy H Wentzell

Question 7

a. What force can be applied to the road at these two ratios? b. If the truck weighs 40,000 pounds, ignoring any friction, what is the maximum rate of acceleration on a flat road? 7. A hydraulic elevator has a weight of 4,500 pounds for the moving parts, including passengers, and the hydraulic cylinder has an effective piston diameter of eight inches a. Calculate the pressure needed in the fluid when the elevator is not moving b. If the elevator goes up 20 feet in 10 seconds (ignore accelera- tion), calculate the work done. c. Determine the average power required. in the first second, the elevator accelerates to a speed of 2 ft/ sec, calculate the force required and the power required during this first second. e. In part d, what was the pressure in the fluid during this acceleration? f. If, during the last second, the elevator decelerates at the same rate as it accelerated, what was the total work done? 8. The moving parts of a hydraulic elevator have a mass of 1,000 kg and the hydraulic cylinder has an effective piston diameter of 25 cm. Cululato tha nressure needed in the fluid when the elevator is


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