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Questions on Pressure

Q3.An oil jet is used at a factory making chocolate bars with honeycombed candy centres. The candy sheets are cut to size using a high pressure jet of oil.

The jet cuts through a brittle sheet of candy without causing it to crumble.

The oil jet is circular and has a diameter of 0.15 mm.

It hits the sheet with a pressure of 18 000 000 N/m2

Calculate the force produced by the jet on the sheet of candy.

P = F/A
So F = PA
Area = πr2 

Area = π (0.075 x 10-3)2
F = 18000000 x π (0.075 x 10-3)2

F = 0.32 N

 

Maximum 4 marks