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kitttimothy55
05.11.2019 •
Physics
Workers do 8000 j of work on a 2000-n crate to push it up a ramp. if the ramp is 2 m high, what is the efficiency of the ramp?
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Ответ:
50%
Explanation:
Efficiency = work out / work in
e = Fd / W
e = (2000 N) (2 m) / (8000 J)
e = 0.5
Ответ:
50% efficiency
Explanation:
The efficiency is calculated with the following formula:
this can also be:
which is more intuitive for the present problem.
the work required, using the definition of work as
where
is force in newtons, and
is distance in meters.
in this case
, and
, so the work required is:
And the work done according to the problem is:
Thus, the efficiency is:
And since
%
⇒the answer is that the efficiency of the ramp is 50%
Ответ:
Explanation:yes