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Mrrafil [7]
3 years ago
12

In an area in which electricity costs 8 cents/kilowatt-hour, a 5 kW clothes dryer runs for 90 minutes to dry a load of laundry.

How much did it cost to dry these clothes?
These are the choices
$0.20
$0.30
$0.45
$0.60
Please help!!!!!!!!!!!!
Physics
2 answers:
aliya0001 [1]3 years ago
6 0
Firstly find kilowatt*hour
so you have 5*1.5(90min=1.5hours)
7.5*8 =60
so the cost is 60 cent
8cent/kilowatthour*7.5kilowatt hour
Over [174]3 years ago
5 0
$0.60
90 mins is 1.5 hrs
5 kW × 1.5 = 7.5 kWh
7.5 kWh × $0.08 = $0.60
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Refer to the diagram shown.

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Let m = the mass of the object.
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3 years ago
Ccording to coulomb's law, which pair of charged particles has the lowest potential energy? according to coulomb's law, which pa
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Coulombs law says that the force between any two charges depends on the amount of charges and distance between them. This force is directly proportional to the magnitude of the two charges and inversely proportional to the distance between them.

F=k\frac{|q_1| |q_2|}{r^2}

where q_1\hspace{1mm}and\hspace{1mm}q_2 are charges, r is the distance between them and k is the coulomb constant.

case 1:

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case 2

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case 3:

q_1=-e\\ q_2=+e\\ r=100pm\\ \Rightarrow F=k\frac{|-e||e|}{(200pm)^2}=0.25ke^2\times10^8

Comparing the 3 cases:

The maximum potential force according to coulombs law is between -1 charge and +3 charge separated by a distance of 100 pm.

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