A fixed crane has a mass of 1000 kg and is used to lift a 2400 kg crate. It is held in place by a pín at A and a rocker at B as shown 2400 kg 1.5 m 2 m- 4 m Ture or False: At point A the contacting body is preventing the Crane truss from moving in both the horizontal and vertical directions. Select one: O True False

Determine the magnitudes of all pin reactions for the frame loaded as shown. Assume F- 860 N, a - 695 mm, b - 350 mm, 0 = 32°, and o = 56° |F A Answers: A- i N В- N D- i N

The bobcat loader (Figure Q3) has a mass of 1200-kg, shows the center of mass is at G1. If there is a 200-kg pebble in the bucket, with center of mass at G2 determine the reactions of each pair of wheels A and B on the ground and the force in the hydraulic cylinder CD and at the pin E. There is a similar linkage on each side of the loader. L0.5 m E 0.1 m_ D 0.2 m G2 0.18 m G1 0.6 m 0.5 m В 0.45 m 1.2 m 0.15 m 0.2 m 0.05 m Figure Q3

A 65 kg beef carcass (k-0.47 w/mk and a-0.13 x10-6 m/s) initially at a uniform temperature of 37 "C is to be cooled by refrigerated air at -10 oC flowing at a velocity of 1.2 ms. The average heat transfer coefficient between the carcass and the air is 22 W/m²K. Treating the carcass as a cylinder of diameter 24 cm and the height 1.4 m and disregarding heat transfer from the base and top surfaces, Determine how long it will take for the centre temperature of the carcass to drop to 4 °C b. Also, determine if any part of the carcass will freeze during this process Hava- air -10 °C 12m/s Sider E Beef JTC