Question

A machine needed 1000 joule energy to raise 10 kg block at a distance of 6m. What is the machine efficiency?

Answer 1

Answer:

Hence, machine efficiency is 60%.

Answer 2

Given:

Energy = 1000J

Mass = 10kg

Distance = 6m

To find:

Machine Efficiency

Solution:

Firstly, find force

To calculate force formula used is-

       F = mg

here, F = force

        m = mass

        g = 10ms⁻¹

      F = 10 × 10

      F = 100N

so, the force will be 100N.

Now, calculate work required,

   Work required, Wr = F × d

                                   = 100 × 6

                                   = 600J

   Work done, Wd = 1000J

So, to calculate machine efficiency, we have

$efficiency = \frac{wr}{wd}$

$efficiency = \frac{600}{1000}$

$efficiency = 0.6 \times 100$

Efficiency =60%

Hence, Machine efficiency is 60%

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