Water is heated at a rate of 10 kg/s from a temperature of 15°c to 35°c by passing it through five identical tubes, each 5.0 cm in diameter, whose surface temperature is 60.0°c. estimate (a) the steady rate of heat transfer and (b) the length of tubes needed to accomplish this task.

Two objects of different mass start from rest, are pulled by the same magnitude net force, and are moved through the same distance. the work done on object 1 is 900 j. after the force has pulled each object, object 1 moves twice as fast as object 2. how much work is done on object 2?