# physics

At 7.35 cents per kiloway hr, A. what does it cost to operate a 10.0 hp motor for 8.00 hr? B. What does it cost to leave a 75W light burning 24 hr a day?

1. Just multiply by conversion factors to change from what you have to what you want:

You have

10.0 hp * 8.00 hr = 80.00 hp-hr * 0.0735$/kw-hr = 1088.435$-hp/kw * 1.0 kw / 1.341 hp = $811.66 posted by Steve 2. A. I get a different answer 10 hp = 7460 W = 7.46 kW Energy used (in kW-h) = 7.46*8 = 59.68 Cost = (59.68 kW-h)*(0.0735$/kW-h)
4. ### physics

How much will it cost you (in cents) to operate a 29 Ω electric skillet on a standard 120 V outlet for 5 hours and 36 minutes? The unit price for electrical energy in this case is 7.350 cents/kWh.
5. ### MATH

I am new to this site. I am not sure if my last post went thru, with my calculations for review, so I will copy and paste my entire query. Thanks for your assistance. === Additional questions: this is for a form I need to fill out
6. ### Science grd 9

The estimated average energy that I used to operate a cloths dryer for a year is is kW•h. If the average rate to operate the dryer is 7.15 cents/kW•h, what is the average cost per year.

10. ### Physics

An electrical motor is designed to operate on 34 V at 1.3 A. How much resistance must be connected in series to this motor, if you wish to plug it in to a 120 V outlet?

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