1. By how much would you need to heat a 10 foot bar of zinc to make it expand by one inch? The coefficient of linear expansion of zinc is 30 x 10^-6 per degree C.
2. A metal bar changes in length by 1 meter with a 150 degree C change in temperature. It's coeffieceint of linea expansion is 25 x 10^-6 per degree Celsius.
what is the metal bar's original length?