Home
Class 9
PHYSICS
A man whose mass is 90 kg stands on his ...

A man whose mass is 90 kg stands on his feet on a floor. The total area of contact of his two feet with the floor is `0.036 m^(2) ("Take," g = 10 ms^(-2))`. How much is the pressure exerted by him on the floor?

Text Solution

Verified by Experts

The weight of the man (thrust),
`F = mg = 90 kg xx 10 ms^(-2) = 900 N`
Pressure, ` P = F/A = (900 N)/(0.036 m^(2)) = 25000 ` Pa
Doubtnut Promotions Banner Mobile Dark
|

Topper's Solved these Questions

  • FLUIDS

    FULL MARKS|Exercise ADDITIONAL QUESTIONS I. Answer the following.|9 Videos
  • FLUIDS

    FULL MARKS|Exercise Activity|1 Videos
  • FLUIDS

    FULL MARKS|Exercise EXERCISE IX. HOTS|4 Videos
  • ELECTRIC CHARGE AND ELECTRIC CURRENT

    FULL MARKS|Exercise ADDITIONAL QUESTIONS (LONG ANSWERS QUESTIONS)|4 Videos
  • HEAT

    FULL MARKS|Exercise Additional Questions (Long Answer)|4 Videos

Similar Questions

Explore conceptually related problems

A man whose mass is 90 kg stands on his feet on a floor. The total area of contact of his two feet with the floor is 0.036m^(2) . (Take, g= 10 ms^(-2) ). How much is the pressure exerted by him on the floor?

An object of mass 1 kg is falling from the height h = 10 m. Calculate The total energy of an object at h = 10 m (Assume g = 10 ms^(-2) )

A person (40 kg) is managing to be at rest between two verticle walls by pressing one wall A by hi hands and feet and the other wall B by his back figure. Assume that the friction coefficient between his body and the walls is 0.8 and that limiting friction acts at all the contacts. a. show that the person pushes the two walls with equal force. b. find the normal force exerted by either wall on the person Take g=10 m/s^2 .

The body of mass 400 g slides on a rough horizontal surface. If the frictional force is 3.0 N, find the angle made by the contact force on the body with the vertical. Take g=10 m/s^2

Figure shows water in a container having 2.0-mm thick walls made of a material of thermal conductivity 0.50Wm^(-1)C^(-1) . The container is kept in a melting-ice bath at 0^(@)C . The total surface area in contact with water is 0.05m^(2) . A wheel is clamped inside the water and is coupled to a block of mass M as shown in the figure. As the goes down, the wheel rotates. It is found that after some time a steady state is reached in which the block goes down with a constant speed of 10cms^(-1) and the temperature of the water remains constant at 1.0^(@)C .Find the mass M of the block. Assume that the heat flow out of the water only through the walls in contact. Take g=10ms^(-2) .

The ladder shown in figure has negligible mass and rests on a frictionless floor. The crossbar connects the two legs of the ladder at the middle. The angle between the two legs is 60^0 . The fat person sitting on the ladder has a mas of 80 kg. Find the contact force exerted by the floor on each leg and the tension in the cross bar.

An object of mass 2 kg falls from a height of 5 m to the ground. What is the work done by the gravitational force on the object? (Neglect air resistance, Take g = 10 ms^(-2) ).

A heavy particle of mass 0.50 kg is hanging from a string fixed with the roof. Find the force exerted by the string on the particle. Take g = 9.8 m/s^2 .

The blocks shown in figure have equal masses. The surface of A is smooth but that of B has a friction coefficient of 0.10 with the floor. Block A is moving at a speed of 10 m/s towards B which is kept at rest. Find the distance travelled by B if a. the collision is perfectly elastic and b. the collision is perfectly inelastic. Take g=10 m/s^2 .

A boy (30 kg) sitting on his horse whips it. The horse speeds up at an average acceleration of 2.0 m/s^2 . A. If the boy does not slide back, what is the force of friction exerted by the horse on the boy? b.If the boy slides back during the acceleration, what can be said about the coefficient of static friction between the horse and the boy. Take g = 10 m/s^2