A hall has a volume of `10000 m^(3)`. Its total absorption is equivalentto 400sq. M of an open window. What will be the effect ona reverberation time if audience fills the hall and increases the absorption by another 400sq. Metre of an open window?

An auditorium has volume of 10^5 m^3 and surface area of absorption 2xx10^4 m^2 . Its average absorption coefficient is 0.2. The reverberation time of the auditorium is second is

A tank has a hole of area 2 cm^(2) at its bottom and in this hole a conical cork is placed and water is filled up. The water level is made to fall slowly by means of another orifice in the tank. When the water level come to a height of 'H' cm , the conical cork just comes out from the hole. Given, volume of water displaced by the cork =80 cm^(3) , mass of the cork =40 gm , Area of hole =2 cm^(2) , density of water =1 gm//cm^(3) . Area of circular cross-section of conical cork =8cm^(2) , Height of cork submerged in water =(120)/(7) cm . Take g=10m//s^(2) , pi=(22)/(7) and P_(0)=10^(5)N//m^(2) . The total force exerted by all the fluids on the conical cork in the vertical direction is

An open container has dimensions of 4.0 m xx5.0 m and height of 3.0 m. (i) Find the weight of the air in the container at 20^(@)C . (ii) What is the weight of an equal volume of water ? Also find pressure at the base of container due to this weight pof water. (iii) What is the total downward force on the base of the container due to air pressure of 1.0 atm ? Take the denities of air and water as 1.2 kg//m^(3) and 10^(3) kg//m^(3) respectively.

An open container has dimensions of 4.0 m xx5.0 m and height of 3.0 m. (i) Find the weight of the air in the container at 20^(@)C . (ii) What is the weight of an equal volume of water ? Also find pressure at the base of container due to this weight pof water. (iii) What is the total downward force on the base of the container due to air pressure of 1.0 atm ? Take the denities of air and water as 1.2 kg//m^(3) and 10^(3) kg//m^(3) respectively.

Water is filled to a height of 2.5 m in a container lying rest on a horizontal surface as shown in the figure. The bottom of the container is square shaped of side sqrt(3) and its top is open. There is a very small hole in the vertical wall of the container near the bottom. A small cap closes the hole. The hole gets opened when pressure near the bottom becomes more than 4 xx 10^(4) pascal a, What minimum acceleration can be given to the container in the positive x -direction so that the cap will come out of the hole? Assume water does not spill out of container when the container accelerates. Find the velocity of efflux as soon as the container starts moving with the acceleration calculated in part a. of the question.

Water is filled to a height of 2.5 m in a container lying rest on a horizontal surface as shown in the figure. The bottom of the container is square shaped of side sqrt(3) and its top is open. There is a very small hole in the vertical wall of the container near the bottom. A small cap closes the hole. The hole gets opened when pressure near the bottom becomes more than 4 xx 10^(4) pascal a, What minimum acceleration can be given to the container in the positive x -direction so that the cap will come out of the hole? Assume water does not spill out of container when the container accelerates. Find the velocity of efflux as soon as the container starts moving with the acceleration calculated in part a. of the question.