Question

what effort is needed to balance a load of 800 Newton in a wheel and axle with efficiency 80%. if radus of the wheel is 8cm and that of axe is 2cm
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Answer 1

Answer:

refer the attachment

Explanation:

refer this above picture

Answer 2

Answer:

250N

Explanation:

Given,

Radius of the wheel (R) = 8cm

Radius of the axle (r) = 2cm

Efficiency (ñ) = 80%

Load (L) = 800N

Effort (E) = ?

By the formula,

VR = R/r

=8/2

=4

Now,

ñ = MA/VR × 100%

or, ñ = L/E ÷ 4 ×100%

or, 80 = 800/4E ×100%

or, 320E = 80000

or, E = 80000/320

:. Effort = 250N

Hence, 250N effort is needed to balance .