The pressure exerted on the ground by a man is greatest when: A) he stands with

Question

The pressure exerted on the ground by a man is greatest when: A) he stands with both feet flat on the ground B) he stands flat on one foot C) he stands on the toes of one foot D) he lies down on the ground E) all of the above yield the same pressure A certain object floats in fluids of density 1. 0.9_rho 0 2. 0.9_rho 0 3. 1.1rho 0 Which of the following statements is true? A) the buoyant force of fluid 1 is greater than the buoyant forces of the other two fluids B) the buoyant force of fluid 3 is greater than the buoyant forces of the other two fluids C) the three fluids exert the same buoyant force B) the object displaces the same volume of all three fluids E) none of these arc true

Explanation / Answer

11. Pressure = Force/Area , so lesser the area more the pressure.Force is constant in all the cases given i.e F=mg but Area is least when he stands on toes on one foot. So the pressure is maximum in that case.

So Ans - C)

12. Buoyancy force on an object is the weight of fluid the object displaces,

B=(density of fluid * Volume of object in fluid), So when fluid has more density it exerts more buoyant force, in this case in option 3 the fluid has the most density and therefore that fluid exerts the greatest buoyancy force.

Ans - B).

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