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Mumz [18]
3 years ago
15

Which refers to the ratio of output work to input work of a machine expressed as a percent?

Physics
2 answers:
luda_lava [24]3 years ago
8 0

Answer:

wattage

Explanation:

Vika [28.1K]3 years ago
3 0

Answer: C.) Efficiency

Explanation: Edge 2020 good luck ^__^

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If you exert 250J of work onto a lever that is 5m long, what amount of force are you applying?
maks197457 [2]
From the formula of W = F·d , becuase we have the values for W and d we can find F

W = F·d 
F= W/d
  = 250/5
  = 50 N

40 N of force was applied
7 0
3 years ago
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3) A 15.0kg cannonball is ascending after being launched. Neglect drag.
WINSTONCH [101]

Answer:

c

Explanation:

3 0
3 years ago
A 45 N girl sits on a bench 0.6 meters off the ground. How much work is done on the bench?
ycow [4]

Answer: 27 joules

Explanation:

Work is done when force is applied on the bench over a distance. it is measured in joules.

Workdone = force x distance

= 45 N x 0.6 metres

= 27 joules

Thus, 27 joules of work is done on the bench.

6 0
3 years ago
Ran 300 meter in 40 seconds, what is the speed?
nignag [31]

Answer:

7.5

Explanation:

Speed= distance/ time

Speed= 300m/40sec

Speed= 7.5m/s

5 0
3 years ago
Why air pollution is a problem?
Strike441 [17]
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2. </span><span>The air we breathe has a very exact chemical composition; 99 percent of it is made up of nitrogen, oxygen, water vapor and inert gases. Air </span>pollution occurs<span> when things that aren't normally there are added to the air. A common type of air </span>pollution<span>happens when people release particles into the air from burning fuels.
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4. Why is it so important to have clean air? 
8 0
3 years ago
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