Physics
07.10.2021 19:31
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What is the efficiency of a machine that lifts a load of 12.0 kg a vertical distance
What is the efficiency of a machine that lifts a load of 12.0 kg a vertical distance of 5.00
m in 30.0 s after being supplied with 70.0 W of power? Explain the steps you take to get the answer.
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Kiki18love
4,9(14 marks)
Efficency = 28%
Explanation:
We have the load has a weight of:
![w =m*g\\w =12*9.81\\w = 117.72 [N]](/tpl/images/1010/8274/3cacb.png)
Work in physics is defined as the product of force (weight) by distance.
where:
W = work [J]
w = weight = 117.72[N]
d = distance = 5 [m]
![W=117.72*5\\W=588.6[J]](/tpl/images/1010/8274/692a7.png)
Now power is defined as the relationship of work at a certain time.
where:
P = power [W]
W = work = 588.6[J]
t = time = 30[s]
![P=588.6/30\\P=19.62[W]](/tpl/images/1010/8274/4d98c.png)
Now the efficiency of a machine is defined as the power output over the power input to the machine. The power input should always be greater than the power output.
SKYBLUE1015
4,8(79 marks)
It’s movement i believe :)
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