A piece of a metal having a mass of 150.0000 grams is heated to 99.3 9C. When the hot metal is submerged in 50.000 grams of water originally at 21.3 oC, the final temperature of the water and metal is 48.4 pC. Determine the heat flow (q) of the water in Joules Record your answer to the correct number of significant figures

Explanation:

q = heat added to water = mass x specific heat of water x rise in temperature

= 50.0000 x 1 x ( 48.4 - 21.3 )

= 1355.0 cals

= 1355.0 x 4.2 J

= 5691.0 J

q = 5691

= 5690 J  ( rounding off to significant no of  3 )

a gas, having a molecular weight of 13 kg/kmol and a kinematic viscosity of 0.25 cm2/s, flows through a pipe 0.25 m internal diameter and 5 km long at the rate of 0.4 m3/s and is delivered at atmospheric pressure.