Three individuals stand with all of their weight on the heel of one foot, a man

Question

Three individuals stand with all of their weight on the heel of one foot, a man of weight 600 N and a heel area of 100 cm^2, a child of weight 200 N and a heel area of 25 cm^2, and woman of weight 450 N and a heel area of 2 cm^2. The one exerting the least pressure on the ground is A the man B the child. C. the woman D All exert the same A hydraulic jack is used to lift a load of weight 4000 N The load-bearing cylinder has a radius of 4 cm, and the other piston has a radius of 1 cm. What force must be exerted on the smaller piston to support the load? A 100N B 250 N C 1000 N O 4000 N E. 10.000 N A gas originally occupies a volume of 0 5 m^3 at a pressure of 100 kPa. It s slowly allowed to expand until the volume is 2 5 m^3. Assuming the temperature is kept constant the final pressure will be A 500 kPa B 100 kPa C 50 kPa. D. 20 kPa E 10 kPa The density of ice is about 900 kg/m^3, and the density of water is about 1000 kg/m^3. A cubic block of ice one meter on a side floats in water. Assuming that the lowest square face of the cube is horizontal, the height of the block above the water line is A 0.9 m B 0.8 m. C. 0.5 m D 0.2 m E 0.1m. One section of a pipe carrying water has a cross-sectional area of 16 cm^2; in this section the water has now velocity of 1.0 m/s. Another section of this pipe has a constricted cross-sectional area of 4 cm^2. If the flow is steady, what is the water velocity in the constricted section? A 4.0 m/s B. 2.0 m/s C. 1.0 m/s D 0.50 m/s E 025 m/s A gas originally occupies a volume of 0.5 m^3 at a pressure of 100 kPa. It is slowly allowed to expand until the volume is 2 5 m^3. Assuming the temperature is kept constant, the final pressure will be A 500 kPa B 100 kPa C 50kPa D 20kPa E 10kPa Two equal charges repel one another with a force of 4 0 times 10^-4 N when they are 10 cm apart. (Coulomb s constant is k = 9 0 times 10^9 N m^2/C^2) If they are moved until the separation is 5 cm, the repulsive force will be A. 0 25 times 10^-4 N B. 1.0 times 10^-4 N. C. 4.0 times 10^-4 N D. 16 times 10^-4 N E. 64 times 10^-4 N

Explanation / Answer

here,

1)

the preesure of heel of man , Pm = 600 /100 N/cm^2 = 6 N/cm^2

the preesure of heel of child , Pc = 200 /25 N/cm^2 = 8 N/cm^2

the preesure of heel of woman , Pw = 450 /2 N/cm^2 = 225 N/cm^2

so, the least pressure is on ground is A) the man

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