EBK MACHINE ELEMENTS IN MECHANICAL DESI
EBK MACHINE ELEMENTS IN MECHANICAL DESI
6th Edition
ISBN: 9780134451947
Author: Wang
Publisher: YUZU
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Chapter 1, Problem 9P

For the devices described in Problems1−14, write a set of functions and design requirements in a similar manner to those in Section1−4. You or your instructor may add more specific information to the general descriptions given.

9. A crane to lift building materials from the ground to the top of a building during construction.

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A new blimp will move at 6 m/s in 20°C air, and we want to predict the drag force. Using a 1: 14-scale model in water at 20°C and measuring a 2500-N drag force on the model, determine (a) the required water velocity, (b) the drag on the prototype blimp and, (c) the power that will be required to propel it through the air. (a) Vm = i (b) Dp = i (c) Pp = i m/s N W
Drag measurements were taken for a sphere, with a diameter of 5 cm, moving at 3.7 m/s in water at 20°C. The resulting drag on the sphere was 10 N. For a balloon with 1-m diameter rising in air with standard temperature and pressure, determine (a) the velocity if Reynolds number similarity is enforced and (b) the drag force if the drag coefficient in the equation below is the dependent pi term. li ε pVI D 1 = CD = Q μ (a) Vp = i (b) Dp = i m/s N
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EBK MACHINE ELEMENTS IN MECHANICAL DESI

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