Answer to Question 5

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 Radius = 0.5 10-2 m2

Area = p (0.5 10-2)2 = 7.85 10-5 m2

Force= pressure area = 5.10 107 Pa 7.85 10-5 m2 = 4006 N

You did remember to halve the diameter to get the radius, didn't you?