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4 Cards in this Set
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- Back
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A gear and a pinion have a ratio of 5 to 1. If the gear is rotating at the speed of 150 revolutions per minute, the speed of the pinion is most nearly
A. 750 B. 300 rpm C. 150 rpm D. 30 rpm |
A. The gear is rotating at a speed of 150 rpm. At a ratio of 5:1 , the pinion makes 5 revolutions for each revolution of the gear. So the speed of the pinion is 150 X 5. 750
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A 3ft X 6ft tank is filled 3,600 lb of water. What is the pressure on the bottom, in lb/ft2?
A. 100 B. 200 C. 400 D. 800 |
The tank has an area of 18 square feet. Pressure = force/area. If the total weight of the water = 3,600 lbs., weight per square foot = 3600/18 = 200 lbs/ft^2
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What effort is required in a pulley system with 2 strands lifting 100 pounds?
A. 40 lbs. B. 50lbs. C. 100lbs D. 200lbs. |
B. Ratio is 2:1 So, 100 divided by 2 = 50
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A wrench uses which simple machine to turn a blot?
A. lever B. Inclined plane C. Pulley D. Wheel and axle |
D. A wrench uses a wheel-and-axele effect to move a bolt or nut.
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