Untitled Section 19. How much energy is required to melt 450 g of ice if the Lf=3.33 x 105 1 point J/kg? a. 1498.5 kJ ( b. 1.4985 kJ C. 149.85 KJ d. None of the choices 20. How much heat is required to raise the temperature of 0.15 kg of water 1 point from 20 OC to 55 0C. a. 22 KJ b. 42 KJ c. 45.8 KJ O d. None of the choices21. How much energy is required to convert 3kg of ice at DEC to water at 1 point EDGE. 0 3.15315 to O b. so ooo Lu 0 c.13?5.?4kJ 0 d. None of the choices 22. What is the rate of heat flow through a glass window that is 2 m x 3 m x 1 point 1.4 cm thick if the outside temperature is 2201': and the inside temperature is 250C ? K=CL84 M m DC 0 21.25.32 kw O b.1133 too O c.4116 kW 0 d. None of the choices 23. If 10780 J of heat energy is transferred though the window every 1 point second, how much energy will be transferred in a 30 day month? a. 1.36 x 10 9 J b. 2.799 x 109 J O C. 4.36 x 109 J O d. None of the choices 24. The R-value for a certain building material that is 2.4 mm thick is 1.5 . 1 point What is the R-value if the thickness is increased to 4.8 mm. a. 2.4 O b. 2.7 O c. 3 O d. None of the choices 25. A sphere (e=0.42) of radius 25 cm is at 270C. It is placed in a room with 1 point a temperature of 20C. what is the rate of heat energy leaving the sphere? a. 245.36 W O b. 151.4 W O C. 121.65 W O d. None of the choices