6. Your 60-watt light bulb is plugged into a 110-volt household outlet and left on for 3 hours. The utility company charges you $0.11 per kiloWatt•hr. Calculate the cost of such a mistake

$0.0198

Explanation:

Commercial power is consumed in kilowatt-hours (kWh).

kWh is the energy supplied by a rate of working of 1000 W in 1 hours.

Most utility company sells electric energy in units of kWh

From the question,

Total energy consumed by the light bulb when for 3 hours = (60×3/1000) kWh = 0.18 kWh.

If the utility company charges $0.11 for 1 kWh.

I.e,

1 kWh = $0.11

Then, 0.18 kWh = 0.11(0.18) = $0.0198

Hence the cost of such mistake is = $0.0198

c)as speed changes, wavelength and frequency change.

everything changes!

electric field is a function of 1/r^2

yes, the force per unit charge for a point charge is inverse square law.