Give reasons for the following.
1. A machine cannot be 100% efficient.
2. A pulley has a groove cut along its rim.
3. A second class lever always increases
the
effect of effort applied.
4. Mechanical advantage of a third class lever
is always less than one.
5. It takes less effort to insert a screw into
wood than to insert a nail.
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Answer:ok someone else will answer
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