CBSE Class 9 Answered
A block of wood is kept on a table top . The mass of wooden block is 5kg and its dimension are 40cm*25cm*10cm. Find pressure extended
Asked by srivathchava15 | 14 Mar, 2015, 09:07: PM
Expert Answer
Given:
Mass of the wooden block= 5 kg
Dimensions = 40 cm x 25 cm x 10 cm
The weight of the wooden block applies a thrust on the top of the table.
Thrust = F = m x g
= 5 kg x 9.8 m s-2
= 49 N
Considering the sides of dimensions,
(a) 25 cm x 10 cm
(b) 40 cm x 25 cm
(a) When the block lies on its sides of dimensions 25 cm x 10 cm
Area of a side = length x breadth
= 25 cm x 10 cm = 250 cm2 = 0.025 m2
Therefore,
The pressure exerted by 25 cm x 10 cm is 1960 N m-2.
(b) When the block lies on its sides of dimensions 40 cm x 25 cm
Area of a side = length x breadth
= 40 cm x 25 cm = 1000 cm2 = 0.1m2
Therefore,
The pressure exerted by 40 cm x 25 cm is 490N m-2.
Answered by Faiza Lambe | 14 Mar, 2015, 10:04: PM
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