Some homes that use baseboard heating use copper tubing. hot water runs through and heats the copper tubing, which in turn heats aluminum fins. it is actually the aluminum fins that heat the air rising through the fins. how much energy would it take to heat a section of the copper tubing that weighs about 715.0 g , from 13.65 ∘c to 26.60 ∘c ? copper has a specific heat of 0.3850 j/(g⋅∘c).

Adiver in midair has an angular velocity of 6.0 rad/s and a moment of inertia of 1.2 kg·m2. he then pulls is arms and legs into a tuck position and his angular velocity increases to 12 rad/s. the net external torque acting on the diver is zero. what is his moment of inertia in the tuck position?

Select all the correct answers. which three statements about electromagnetic radiation are true?

Ahair dryer is basically a duct in which a few layers of electric resistors are placed. a small fan pulls the air in and forces it through the resistors where it is heated. air enters a 1200 w hair dryer at 100 kpa and 22°c and leaves at 47°c. the cross-sectional area of the hair dryer at the exit is 60 cm2. neglecting the power consumed by the fan and the heat losses through the walls of the hair dryer, determine (a) the volume flow rate of air at the inlet and (b) the velocity of the air at the exit.