A 4 kW resistance heater in a water heater runs for 2 hours to raise the water temperature to the desired level. The amount of electric energy used is 28800 kJ OBJ O 30 kJ O 4 kW Question 3 1 pts The equation Q = kA(AT/L) solves for the total heat transfer rate Q [W] during conduction within a solid of length L. The cross section of the solid is represented by the area A. And the temperature difference between the two sides is represented by T. k is a material property of the solid. The units of k in metric unit system are O W/m.K O W/mK O kg/m.K Om/W Question 4 1 pts Lift force FL of an airfoil is calculated using FL = 0.5p2 ACL. Where p is the density of air, v is the velocity of air and A is the area of the wing. The units of lift coefficient Clare unitless ON.s/ke Om^2/s ON Question 5 1 pts Volumetric flow rate of a liquid is given by the volume of flow per unit time, while mass flow rate th of a liquid is given by the quantity of mass flowing per unit time. What must fluid property must be multiplied with volumetric flow rate to convert it to mass flow rate? In other words, m F V. the property is? O density O velocity O brea time