A piece of copper, of mass 120g is heated in a enclosure to a temperature of 125°c. It's den taken out of the enclosure and held in air for half a minutes & dropped carefully into a copper calorimeter of mass 100g containing 20g of H20 at 20°c. The temperature of the water rising to 25°c. calculate the rate at which heat is being 100t 46m the piece of cu, won it's held in air (side of H2o =4200 Jkg-1k-1, STC of cmu =4000 jkg-1k-1​

It may seem strange that the selected velocity does not depend on either the mass or the charge of the particle. (for example, would the velocity of a neutral particle be selected by passage through this device? ) the explanation of this is that the mass and the charge control the resolution of the device--particles with the wrong velocity will be accelerated away from the straight line and will not pass through the exit slit. if the acceleration depends strongly on the velocity, then particles with just slightly wrong velocities will feel a substantial transverse acceleration and will not exit the selector. because the acc