A man exerts a pressure of 2.8 x 103Nm-2 on the ground and has 4 x 10-2m2 of his feet in contact with the ground. The weight of the man is
A
102N
B
70N
C
140N
D
112N
Verified Correct Answer: D.
Physical Principles & Numerical Solution
Pressure = Force / Area = Weight of the man / Area of his feet
=> 2.8 x 103 = Weight of the man / 4 x 10-2
∴ Weight of the man = 2.8 x 103 x 4 x 10-2
= 112N
Source: Myschool Past Questions Archive (Record #12945)