What does mechanical advantage describe regarding simple machines?
2 answers:
Answer:
They multiply the input force.
Explanation:
Mechanical Advantage is the multiplication of the input force to give an increased output by a <em>simple machine </em>due to the difference in the length of load arm and the effort arm.
It is based upon the law of conservation of moments as to force applied at the farther point from a hinge or a pivot needs to be balanced by a greater force counteracting at a shorter distance from the pivot.
<u>Lever is a simple machine which consists of a bar pivoted or supported at a point (called fulcrum) about which it can rotate.</u>
..............................................(1)
where:
force applied on the end of effort arm
force due to load on the end of load arm
L = length of load arm
E = length of effort arm
Equation (1) is known as the law of levers, it was proven by <em>Archimedes </em>using geometric reasoning.
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Answer:
4.163 m
Explanation:
Since the length of the bridge is
L = 380 m
And the bridge consists of 2 spans, the initial length of each span is
Due to the increase in temperature, the length of each span increases according to:
where
is the initial length of one span
is the temperature coefficient of thermal expansion
is the increase in temperature
Substituting,
By using Pythagorean's theorem, we can find by how much the height of each span rises due to this thermal expansion (in fact, the new length corresponds to the hypothenuse of a right triangle, in which the base is the original length of the spand, and the rise in heigth is the other side); so we find: