(i) A metal rod 6.522 long at 285 k expands by 0.576 m at 363 k. find the coefficient of linear expansion of the metal.
(ii) How many electrons are passing per second in a circuit in which there is a current of 5A?

How many electrons are passing per second in a circuit in which there is a current of 5 A ?

A metal rod 6.522 m long at 285K expands by 0.576 m at 363K. Find the coefficient of linear expansion of the metal.

A copper wire of radius 0.1mm and resistance 1k(Omega) is connected across a power supply of 20 V.(a)How many electrons are transferred per second between the supply and the wire at one end?(b) Write down the current density in the wire.

(i)A man is standing between two vertical wall 680 m apart. He claps his hands and hears two distinct echoes after 0.9 seconds and 1.1 seconds respectively .What is the speed of sound in the air ? (ii) An electric heater of resistance 5 Omega is connected to an electric source .If a current of 6 A flows through the heater then find the amount of heat produced in 5 minutes.

One end of a metal rod of length 1.0 m and area of cross section 100cm^2 is maintained at 100° C. If the other end of the rod is maintained at 0°C, the quantity of heat transmitted through the rod per minute is (Coefficient of thermal conductivity of material of rod =100 W/m-K)

(a) Find the final temperature of a copper rod. Whose area of cross section changes from 10m^(2) to 11m^(2) due to heating. The copper rod is initially kept at 90K. (Coefficient of superficial expansion is 0.0021/K). (b) The far position of a myopic person is 90 cm is front of the eye. what is the nature and power of the lens required to correct the problem?