posted by Micah

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. Steve

    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

  2. drwls

    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)
    = $4.38

  3. Elvis Rabohale

    1 hp = 0.745699872 kilowatts
    10hp X 0.745699872 X 8 = 59.66 kWh
    Cost = 59.66 X 0.0735 = R4.38472

    75W/1000 X 24 X 0.0735 = R0.1323

Respond to this Question

First Name

Your Answer

Similar Questions

  1. Word Problem Cost minimization

    Don Garcia needs at least 24 units of vitamin A per day. Each green pill provides 4 units and each red pill provides one unit. Green pills cost 3.5¢ each and red pills cost 1¢ each. How many of each kind of pill should he take to …
  2. Physics - electricity

    An incandescent lamp is marked '120v,75W' a)what is the current in the lamp under normal condition of operation?
  3. Physics

    At 7.65 cents per kilowatt-hour, what does it cost to operate a 10.0 hp motor for 6.00 hr?
  4. physics

    A small motor draws a current of 1.76 A from a 110 V line. The output power of the motor is 0.20 hp. (a) At a rate of $0.060/kWh, what is the cost, in cents, of operating the motor for 4.0 h?
  5. Physics

    At 7.65 cents per kilowatt-hour, what does it cost to operate a 8.00 hp motor for 7.00 hr?
  6. Physics

    A 60 W light bulb at 120 V is left on in your house to prevent burglary, and the power charges 10 cents per kilowatt-hour, how much will it cost to leave the bulb on for 30 days?
  7. physics

    At 7.15 cents per kilowatt-hour, what does it cost to leave a 75.0W light burning 24.0 hours a day?
  8. AP Physics 1

    If electrical energy costs 12 cents, or $0.12, per kilowatt-hour, how much does it cost to operate an electric over for 5.0 h if it carries a current of 20.0 A at 220 V?
  9. 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 …
  10. math

    it cost a company 15,000 per day to operate a plant no matter how much product they produce. in addition, it cost 75 per unit produced. write an equation that represents the total cost to operate the plant each day. use the variable …

More Similar Questions