Question

1.A box of mass 10 kg has a base area of 1 m2. find the pressure
exerted by it on the ground. (take one kg-wt=10N)

Answer 1

Answer:

20000 pa

Explanation:

Solution -

Given : Mass of iron block, m = 10 kg

Acceleration due to gravity, g = 10 m/s2

so , weight of iron block, W = m x g

= 10 x 10 = 100 N

so we can say force exerted by the iron block on the table top = 100 N

a ) 1st case - F = 100 N

Area = 20 cm x 10 cm

= 20 /100 m x 10 / 100 m

= .02 m2

we know, Pressure = Force /Area

= 100 / .02 Pascal

= 5000 pa

b) 2nd case - F = 100 N

Area = 10 cm x 5cm

= 10 /100 m x 5/ 100 m

= .005 m2

we know, Pressure = Force /Area

= 100 / .005 Pascal

= 20000 pa