A lever has an input arm which is 2m long and an output arm which is 0.1m long. The lever pivots on an extremely rusty hinge, so its mechanical effciency is only 50%. Pushing down on the input arm with a force of
10 newtons will yield a force at the output arm of
(A) 10N.
(B) 20N.
(C) 100N.
(D) 200N.
A lever has an input arm which is 2m long and an output arm which is 0.1m long. The lever pivots on an extremely rusty hinge, so its mechanical effciency is only 50%. Pushing down on the input arm with a force of
10 newtons will yield a force at the output arm of
(A) 10N. --- No.
It's not that rusty. Notice that the output arm
moves only one tenth of a meter.
A lever has an input arm which is 2m long and an output arm which is 0.1m long. The lever pivots on an extremely rusty hinge, so its mechanical effciency is only 50%. Pushing down on the input arm with a force of
10 newtons will yield a force at the output arm of
(B) 20N. --- No.
Notice that the output arm moves
only one tenth of a meter.
A lever has an input arm which is 2m long and an output arm which is 0.1m long. The lever pivots on an extremely rusty hinge, so its mechanical effciency is only 50%. Pushing down on the input arm with a force of
10 newtons will yield a force at the output arm of
(C) 100N. --- Yes. Work in = (10N)(2m) = 20 J.
Work out = (0.5)(Work in) = 10J.
(force)(0.1m) = 10J. ===> force = (10/0.1)N.
A lever has an input arm which is 2m long and an output arm which is 0.1m long. The lever pivots on an extremely rusty hinge, so its mechanical effciency is only 50%. Pushing down on the input arm with a force of
10 newtons will yield a force at the output arm of
(D) 200N. --- No.
That would only happen for 100% efficiency.
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