Aheater uses 20 amperes when connected to a 110-volt electric outlet. if electric power costs 10 cents per kilowatt-hour, the cost of running the heater for 10 hours

$ 2.2

Explanation:

Current, i = 20 A

Voltage, V = 110 V

time, t = 10 hours

Cost of 1 KWh = 10 cents

Energy cosumed in 10 hours

E = V x i x t

E = 110 x 20 x 10 Wh

E = 22 KWh

Cost of 1 KWh = 10 cents

Cost of 22 KWh = 10 x 22 = 220 cents = $2.2

Thus, the ost of heater running for 10 hours is $ 2.2

$2.2

Explanation:

Electric power in watts = Voltage times amparage

P=VI

V=110 V

I= 20 A

P= 110×20= 2200 W

Power consumed in 10 hours = 2200×10= 22000 Wh= 22kWh

total cost of 22kWh consumption= 22×0.10= $2.2

two charges are fixed in place on the x-axis as shown. the charge at x = 0 is negative and has magnitude q = 2 μcoulombs (1 μcoulomb = 10-6 coulombs). the charge at x = d, (d = +12 cm), is positive and has magnitude q = 4 μcoulombs. find a point x = xo along the x-axis at which the electric field is zero.