A bracket, as shown in Fig., is fixed to a vertical steel column by means of five tandard bolts. Determine: 1. the diameter of the fixing bolts, and 2. the thickness (t) of the rm of the bracket. If the maximum allowable tensile stress in the bolt and bracket naterial is ots and Otb MPa respectively. y

You’re using a system of multiple simple machines to move a 1500 N load up a height of 2 meters. You have a wheel barrow which is a combination of a lever and a wheel/axle, and you’ll be using a ramp (inclined plane).a. If you want to apply a maximum effort force of 50 N – what does the actual mechanical advantage of the compound machines need to be? b. The wheel barrow in problem above has the following dimensions Wheel axle radius: 7.5 cmWheel outer radius: 25 cmLoad distance to fulcrum: 55 cm Handle distance to fulcrum: 200 cmWhat is the wheel barrow’s total ideal mechanical advantage? c. Due to a rusty wheel axle, the wheel-barrow in problem above only has an efficiency of 65%. What is the actual mechanical advantage of the wheel barrow?

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b) Figure Q1b shows a compound gear train with Gear A as the pinion (or driver) with an input Power (Pin) of 600 W at Gear A. If Gear A rotates at 139.70 rpm and engages with Gear B, calculate the angular velocity (w) in rad/s for Gears B, C & D; and the input torque (Tin) in at Gear A and output torque (Tout) at Gear D. The number of teeth (N) for gears A, B, C & D are 62 teeth, 34 teeth, 42 teeth and 22 teeth, respectively. Assume 100% efficiency and no frictional losses; and give your answers to two decimal places. GEAR A GEAR C GEAR B GEAR D