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### Mechanical Comprehension

Using the knowledge that you gained from Chapter 7, “Mechanical Comprehension,” choose one answer.

 81 A man is using 60 lbs. of effort to lift a 240 lb. crate. What is the mechanical advantage in this situation? A. MA=14400B. MA=4C. MA=0.25D. MA=1 82 How much work does a 5 hp engine do per minute? A. 33,000 ft_lb per minuteB. 110 ft_lb per minuteC. 2,750 ft_lb per minuteD. 165,000 ft_lb per minute 83 What force must you exert (vertically) on the handles of a wheelbarrow 4 feet from the axle of the wheel in order to lift a weight of 250 lbs. that is concentrated at a point 2 feet from the axle? A. 75 lbs.B. 125 lbs.C. 250 lbs.D. 4 lbs. 84 What is the pressure, in psi, of a tank of water that measures 8 feet square by 14 feet ...

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