The simple lifting machine shown below is used to raise a series of loads. These loads with their corresponding require efforts are shown in the table below.

Load

$250$N

$500$N

$750$N

Effort

$72$N

$142$N

$212$N

Determine the following:

$3\mathrm{.}1$ The velocity ratio of the machine in the sketch

$3\mathrm{.}2$ The formula to be used for this arrangement

$3\mathrm{.}3$ The mechanical advantage and the efficiency of this machine when lifting $250$N load.

$3\mathrm{.}4$ The maximum efficiency attainable by the machine.

$3\mathrm{.}5$ The maximum load that can be lifted if the maximum effort that can be applied is $700$N$.$