Question

1. A see-saw of length 4 m is supported at its
centre. A boy weighing 4 N sits at a distance
of 1 m from the centre of the see-saw. Where
should a girl weighing 2 N sit on the other
side of the see-saw) so as to balance the
weight of the boy?
2. A man can crack a nut by applying a force
of 100 N on a lever of length 0.5 m. What
should be the length of the lever if he wants
to use a force of 75 N to crack the nut?
3. The fulcrum of a crowbar of length 1.25 m is
at a distance of 25 cm from load. Determine
the mechanical advantage of the crowbar
4. The blades of a pair of scissors are 23 cm
long, while its handles are 10 cm long. Find
its mechanical advantage




please answer all these numericals​

Answer 1

Answer:

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Explanation:

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Answer 2

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