In an experiment 4.5 kg of a fuel was completely burnt. The heat produced was measured to be 180,000 KJ. Calculate the calorific value of a the fuel.

In a Young.s slit experiment, the slits are separated by 0.24 mm and the screen is kept 160 cm from the slits. If the fringe width is measured to be 0.4 cm, calculate the wavelength of light used experiment. What would be the new value of the .fringe width., if for the same set up or the same wavelength light, the screen is moved, .inwards., i.e., towards the slits by 40 cm?

A cubical ice box of thermocol has each side 30 cm and thickness 5 cm , 4 kg of ice is put in the box , if outside temperature is 45^(@)C and coefficient of thermal conductivity is 0.01 J s^(-1) m^(-1) K^(-1) . Calculate the mass of ice left after 6 hrs . Take latent heat of fusion of ice as 335 xx 10^(3) JK^(-1)

When 0.5 g of sulphur is burnt to SO_(2):4.6 kJ of heat is liberated. What is the enthalpy of formation of sulphur dioxide ?

For complete combustion of ethanol, C_(2)H_(5)OH(l) + 3O_(2)(g) rarr 2CO_(2)(g) + 3H_(2)O(l) the amount of heat produced as measured in bomb calorimeter is 1364.47 kJ mol^(-1) at 25^(@)C . Assuming ideality the enthalpy of comustion, Delta_(c)H for the reaction will be ( R = 8.314 kJ mol^(-1) )

A block of wood of mass 0.5 kg is suspended by means of a thin wire. A bullet of mass 0.020 kg is fired horizontally in the plane of the block with a velocity of 100ms^(-1) . If the bullet gets stuck inside the block, then calculate the height by which the system rises (g=9.8ms^(-2)) . Calculate the amount of heat produced in the block.