Compare the densities of water at the surface and bottom of a lake 100 m deep, given that the compressibility is `(10^-3)/(22)` per atm and 1 atm ` = 1.015 xx 10^5 Pa`.

What is the density of water at a depth where pressure is 80.0 atm, given that its density at the surface is 1.03 xx 103 kg m^-3 ?

Compute the bulk modulus of water from the following data: Initial volume = 100.0 litre, Pressure increase = 100.0 atm (1 atm = 1.013 xx 10^5 Pa). Final volume = 100.5 litre. Compare the bulk modulus of water with that of air (at constant temperature). Explain in simple terms why the ratio is so large.

The average depth of Indian ocean is 3 km. Find the fractional compression of water at the bottom of the ocean, given that bulk modulus of water id 2.2 xx 10^9 Nm^-2 .

The number density of electron in copper is 8.5 xx10^(28)m^(-3) . Find the current flowing through a copper wire of length 20 cm, area of cross section 1 mm square,when connected to a battery of 3 V. Given the electron mobility = 4.5xx10^(-6)m^(2)V^(-1) s^(-1) and electron charge = 1.6 xx 10^(-19)C.

Calculate the De-Brogile wavelength of an electron and proton if their 10^5 m//s given mass of electron is 9.1 xx 10^(-31) kg (kilogram). Mass of proton 1.67 xx 10^(-27) kg . Plank.s constant h=6.625 xx 10^(-34) JS (Joule Second).

What is the absolute and gauge pressure of the gas above the liquid surface in the tank shown in the following figure? Density of oil = 820 kg m^-3 , density of mercury = 13.6 xx 10^3 kg m^-3 , 1 atmosphere pressure = 1.01 xx 10^5 pa .

The inner diameter of a circular well is 3.5 m. It is 10 m deep. Find its inner curved surface area.

What is the pressure inside the drop of mercury of radius 3.00 mm at room temperature ? Surface tension of mercury at that temperature ( 20^@C ) is 4.65xx10^-1 N m^-1 The atmospheric pressure is 1.01xx 10^5Pa . Also give the excess pressure inside the drop.