The pressure exerted on the ground by a man is greatest when; (1) he stands with

Question

The pressure exerted on the ground by a man is greatest when; (1) he stands with both feet at on the ground, (2) he stands at on one foot, (3) he stands on the toes of one foot, (4) he lies down on the ground, (5) all of the above yield the same pressure (Oscillation) In simple harmonic motion, the magnitude of the acceleration is: (1) constant, (2) proportional to the displacement, (3) inversely proportional to the displacement, (4) greatest when the velocity is greatest, (5) never greater than g (Waves) The displacement of a string is given by y(x, t) = y_m sin(kx + omega t). The wavelength of the wave is: (1) 2 pi k/omega, (2) k/omega, (3) omega k, (4) 2 pi/k, (5) k/2 pi (Waves) Take the speed of sound to be 340m/s. A thunder clap is heard about 3 s after the lightning is seen. The source of both light and sound is: (1) moving overhead faster than the speed of sound, (2) emitting a much higher frequency than is heard, (3) emitting a much lower frequency than is heard, (4) about 1000m away, (5) much more than 1000m away (Temperature) Fahrenheit and Kelvin scales agree numerically at a reading of: (1) -40, (2) 0, (3) 273, (4) 301, (5) 574 (Kinetic theory of gases) A sample of an ideal gas is compressed by a piston from 10m^3 to 5m'^3 and simultaneously cooled from 273 degree C to 0 degree C. As a result there is: (1) an increase in pressure, (2) a decrease in pressure, (3) a decrease in density, (4) no change in density, (5) an increase in density (Charges) Two electrons (e1 and e2) and a proton (p) lie on a straight line, as shown, the directions of the force of e2 on e1, the force of p on e1, and the total force on e1, respectively, are:

Explanation / Answer

14). We know that Pressure= Force/ Area

where Area= Only the area upto which Force is acting

Now in all the options given, force acting will be same which will be the weight of the person. Only the area upton which the force is acting is changing. Then for the 3rd option, area upto which Force is acting is minimum(which is the toes of one foot) and according to above equation, Pressure is inversely proportional to the Area. Thus for 3rd option Pressure will be Maximum.

Hence correct option: 3). he stands on the "toes of one foot"

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