You use a 1200-watt hair dryer for 10 minutes each day. a. How many minutes do you use the hair dryer in a month? (Assume there are 30 days in the month.) b. How many hours do you use the hair dryer in a month? c. What is the power of the hair dryer in kilowatts? d. How many kilowatt-hours of electricity does the hair dryer use in a month? e. If your town charges $0.15/kWh, what is the cost to use the hair dryer for a month?
Answers
Data;
- Power = 1200W
- Time/day = 10 mins
Power
The is the rate of energy used to time. It is the measure of expedience of energy.
a). How many minutes is the dryer used in a month.
Assuming there 30 days in a month;
This shows that the dryer is used 300 minutes in a month.
b). How many hours is the dryer used in a month.
To solve this problem, we simply need to convert the value of (a) from minutes to hours.
The dryer was used for a total of 5 hours in a month.
c). The power of the dryer in kilowatt.
To convert the power in watt to kilowatt, we divide by 1000.
The power in kilowatt is 1.2kw
d). How many kilowatt/hr of electricity used in a month.
The dryer consumes 6kw/h in a month.
e). If the town charges $0.15/kwh, the cost in a month
The cost of the dryer in a month is $0.9.
Learn more on power here;
5 hours
1.2 killowatt
6 killowatt hour
6*0.15=0.9
$0.9
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i had this question before.
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A, magnetic force is always perpendicular to the magnetic field. The direction of the magnetic force is perpendicular to both the direction of the velocity and the direction of the magnetic field.
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The magnetic force is always perpendicular to the direction of the magnetic field, according to the Right-Hand Rule in Physics. Neither parallel nor antiparallel statements are correct.
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Answers
a=F/m=300/25=12 m/s^2