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Mechanical Engineering Questions and Answers December 04, 2019

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A man is found dead in a room at 16C. The surface temperature on his waist is measured to be 23C and the heat transfer coefficient is estimated to be 9 W/m2 C. Modeling the body as 28-cm diameter, 1.80-m-long cylinder, estimate how long it has been since he died. Take the properties of the body to be k = 0.62 W/m C and = 0.15 10-6 m2/s, and

A pump supplies oil at 20 gpm to a 2- in. diameter double-acting hydraulic cylinder. If the load is 1000 lbs (extending and retracting) and the rod diamerter is 1 in., find: a. The hydrualic pressure during the extending stroke b. The piston velocity during the extending stroke c. The cylinder horsepower during the extending stroke d. The

2. A sign of dimensions 2.0 m x1.2 m is supported by a hollow circular pole having outer diameter 220mm and inner diameter 180 mm (see figure). The sign offset 0.5 m from the centerline of the pole and its lower edge is 6.0m above the ground. 0.5 m A B 2.0 m Bills Bookstore 1.2 m 6.0 m Determine the principal stresses and maximum shear stresses
2. A sign of dimensions 2.0 mx1.2 m supported by a hollow circular pole having mis outer diameter 220mm and inner diameter 180 mm 0.5 m (see figure). The sign offset 0.5 m from the centerline of the pole and its lower edge is 6.0m above the 2.0 m ground Determine the principal stresses and maximum shear Bills stresses at points A and B at the base of the pole due Bookstore 1.2 m to wind load, W of 4.8 KN against the sign. Assume that W acts at the midpoint of the sign. Consider the effects of transverse shear stresses. (30 pointsO 6.0 m 180 mm 220 mm

A small metal object, initially at T, 1000 K, is cooled by radiation in a lowtemperature vacuum chamber. One of two thin coatings can be applied to the object so that spectral hemispherical emissivities vary with wavelength as shown. For which coating will the object most rapidly reach a temperature of T 500 K 1.0 Coating B Coating A 0.5 100 10

The graph of f(x) is shown below. The domain of the function is [5, 5], the range of f is [5, 5]. Use the graph below to choose the graph of the function h and state the domain and range of h. h (x) = f(x) + 2 A. B. C. D.

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