The kitchen in your house measures 16 ft by 16 ft. You need to have 50 footcandles of illumination in the room. How many 100 watt bulbs will be required if one bulb emits 1740 lumens. (1 footcandle = 1 lumen/sq. ft). If this bulb is replaced by 23-Watt CFL bulbs to get same illumination, what would be energy cost savings in a year if the bulb operated for for 800 hours in a year with CFL bulbs? The electricity cost is 0.13/kWh in that region. a. $64.06 b. $8.01 c. $58.45 d. $75.92

Aflask with vinegar in it has a mass of 160 grams. a balloon with baking soda in it has a mass of 40 grams. the balloon is attached to the flask to seal the opening and the vinegar and baking soda mixes. the balloon inflates to a large volume. what will the total mass of the balloon and flask be after the balloon inflates? explain. a) less than 200 grams because the solid baking soda disappears. b) 200 grams, because all the atoms remain in the balloon or flask. c) more than 200 grams because the size of the balloon is so much larger. d) less than 200 grams because gases such as the one in the balloon are lighter than solids and liquids.