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3 years ago

What does mechanical advantage describe regarding simple machines?

Physics

2 answers:

raketka [301]3 years ago

8 0

Answer:

they are manufactured

miss Akunina [59]3 years ago

8 0

Answer:

They multiply the input force.

Explanation:

Mechanical Advantage is the multiplication of the input force to give an increased output by a simple machine 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.

Lever is a simple machine which consists of a bar pivoted or supported at a point (called fulcrum) about which it can rotate.

$MA=\frac{F_L}{F_E}= \frac{E}{L}$ ..............................................(1)

where:

$F_E=$ force applied on the end of effort arm

$F_L=$ 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 Archimedes using geometric reasoning.

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murzikaleks [220]

Answer:

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(b) $V=9.76\ V$

Explanation:

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Suppose we have a resistive-only electric circuit. The relation between the current I and the voltage V in a resistance R is given by the Ohm's law:

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$V=11.86\ V$

(b) If the starter motor is operated, taking an additional 35 Amp from the battery, then the total load current is 2.28 A + 35 A = 37.28 A. Thus the output voltage of the battery, that is the voltage that the bulbs have is

$V=\varepsilon -i.R_i=12\ V-37.28\ A\cdot 0.06\ \Omega=9.76\ V$

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