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dexar [7]
3 years ago
14

A construction worker uses 1,000 J of work to screw two boards together. The screw does 855 J of work. Calculate the efficiency

of the screw.
PLZ HELP!!!


​
Physics
1 answer:
Dovator [93]3 years ago
7 0

Answer:

The efficiency of the screw is 85.5%

Explanation:

to calculate efficiency you have to do

efficiency=energy output/ energy input × 100%

so e=855/1000 × 100%=85.5%

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A circus acrobat is shot out of a cannon with an initial upward speed of 34 ft/s. if the acrobat leaves the cannon 4 ft above th
jok3333 [9.3K]
<h2>It will take 0.125 seconds to reach the net.</h2>

Explanation:

Initial speed, u = 34 ft/s = 10.36 m/s

Acceleration, a = -9.81 m/s²

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We have equation of motion, s = ut + 0.5 at²

Substituting

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              1.22 = 10.36 x t + 0.5 x -9.81 x t²

              4.905t² - 10.36 t + 1.22 = 0

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Minimum time is 0.125 seconds.

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6 0
3 years ago
Sometimes balance point may not be obtained on the potentiometer wire why​
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Solution
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Which law states that absolute zero cannot be reached?
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