A metal ball with initial temperature of 30o C is dropped into a large tank filled with water that is kept at the constant temperature of 90o C.

23. A metal ball with initial temperature of 30o C is dropped into a large tank filledwith water that is kept at the constant temperature of 90o C. If the temperature ofthe ball increases 2o C in the first minute, give the temperature of the ball 30minutes later.

Temperature increased by 20C in first minute.So, in 30 minutes, Temperature increased by 30 x 2 = 600CAfter 30 minutes, temperature of ball = 60 +30 = 900C