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

If you touch a hot light bulb and get burned, that is an example of a. radiation b. convection c. conduction

An isolated conducting spherical shell carries a positive charge. part a which statement (or statements) about the electric field and the electric potential inside and outside the spherical shell is correct? which statement (or statements) about the electric field and the electric potential inside and outside the spherical shell is correct? electric potential inside the shell is constant and outside the shell is changing as 1/r2 both the electric potential and the electric field does change with r inside and outside the spherical shell electric potential inside and outside the shell is constant, but not zero electric potential inside the shell is constant and outside the shell is equal to zero electric field inside and outside the shell is constant (does not change with the position r), but is not equal to zero electric field inside and outside the shell is changing as 1/r (where r is the distance from the center of the sphere) electric field inside is equal to zero and outside the shell is constant, but not zero electric potential inside the shell is constant and outside the shell is changing as 1/r electric field inside and outside the shell is changing as 1/r2 electric field inside is equal to zero and outside the shell is changing as 1/r2 electric field inside and outside the shell is zero electric field inside is constant and outside the shell is changing as 1/r

When you jump from an elevated position you usually bend your knees upon reaching the ground. by doing this, you make the time of the impact about 10 times as great as for a stiff-legged landing. in this way the average force your body experiences is a) less than 1/10 as great. b) more than 1/10 as great. c) about 1/10 as great.d) about 10 times as great.