A block of iron of mass 7.5kg and of dimensions 12cm x 8cm x 10cm is kept on a tabletop on its base of side 12cm x 8cm. Calculate (a) thrust and (b) pressure exerted on the tabletop. Take 1kgf = 10N.
(a) To calculate thrust
Force = mass x acceleration due to gravity
= 7.5 x 10
= 75N
Area of the base = 12 x 8 = 96 \mathrm{cm}^{2} \text { or } 0.0096 \mathrm{m}^{2}
(b) To calculate pressure exerted
Pressure = thrust/area
= 75/0.0096
= 7182.5 Pa
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