Mechanical advantage of a machine is $4$ . It is used to raise a load of $30 k g f$ . What is the effort needed?

$8 k g f$

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$7.5 k g f$

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$10 k g f$

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$4 k g f$

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Solution

The correct option is B
$7.5 k g f$

Given,

Mechanical advantage = $4$

Load = $30 k g f$

Mechanical Advantage = $\frac{L o a d}{e f f o r t}$ = $\frac{30}{e f f o r t}$

$∴$ Effort = $\frac{30}{4}$ = $7.5 k g f$

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Mechanical advantage of a machine is 4. It is used to raise a load of 30 kgf. What is the effort needed?

The correct option is B 7.5 kgf Given, Mechanical advantage = 4 Load = 30 kgf Mechanical Advantage = Loadeffort = 30effort ∴ Effort = 304 = 7.5 kgf

Mechanical advantage of a machine is $4$ . It is used to raise a load of $30 k g f$ . What is the effort needed?

The correct option is B
$7.5 k g f$

Given,

Mechanical advantage = $4$

Load = $30 k g f$

Mechanical Advantage = $\frac{L o a d}{e f f o r t}$ = $\frac{30}{e f f o r t}$

$∴$ Effort = $\frac{30}{4}$ = $7.5 k g f$