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2 years ago

When calculating the mechanical advantage of a lever, what two pieces of information are needed?

2 answers:

4 0

From the items on this list, the only one that allows calculation
of the mechanical advantage is 'B' ... the lengths from the fulcrum
to the effort and the resistance.

The MA can also be calculated when you know the two forces ...
the effort and the resistance ... when the lever is just balanced.

Shkiper50 [21]2 years ago

3 0

Answer:

Option B)

the length of the effort arm and the length of the resistance arm

Explanation:

A lever is a simple machine with a point fulcrum known also as a hinge. The lever helps to rotate the body and vary the input force and output force to get maximum mechanical advantage.

Mechanical advantage of a lever is the ratio of the output force to input force.

When there is no friction or other forces this mechanical advantage can also be calculated as the ratio of length of effort arm to length of resistance arm.

Hence option B is right.

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A body covers a semicircle of radius 7cm in 5s .find its linear speed

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Ok so we are given the radius of 7cm and time of 5 seconds.

From the data we got we can calculate speed, frequency, perimeter and area of the semicircle.

Let's start with perimeter.

We know that perimeter of circle is $2\pi r$ so the perimeter of semicircle is $\dfrac{2\pi r}{2}$ or simply $\pi r$

So the perimeter is equal to:

$\pi r=\pi\cdot7\approx\boxed{22cm}$

So this is the length of a curve or let's say the distance.

Now let's look at the linear speed $s=\dfrac{d}{t}$ where d is distance and t time.

We know the distance and we know the time.

So let's calculate it.

$s=\dfrac{d}{t}=\dfrac{22}{5}=\boxed{4.4\dfrac{cm}{s}}$

Hope this helps.

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PLS ANSWER ASAP!!

Molodets [167]

b) between poles M1 and M2

Explanation:

From the expression, we can deduce that r is the distance between two magnetic poles M1 and M2.

The law of attraction between two magnetic poles states that:

<em> the force of attraction or repulsion between two magnetic poles is a function of the product of the strength of the magnetic poles and the square of the distance between the pole</em>s

Mathematically:

FM = K $\frac{M1 M2}{r^{2} }$

here r is the distance between the poles

FM is the magnetic force between the poles

M1 is the strength of the first magnetic pole

M2 is the strength of the second pole

K is the magnetic field constant

learn more:

magnetic pole brainly.com/question/2191993

#learnwithBrainly

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