| Physics Help.asap?

Physics Help.asap?

asa a asked:


I just found out that the hw I thought was due after Spring Break is due today! Please help! Anything you can explain will really help (not just answers please)!!!

A small air compressor operates on a 29 hp
(horsepower) electric motor for 9.8 hours a
day.
How much energy is consumed by the motor
daily? 1 hp equals about 750 watts. Answer
in units of J.
I keep getting answers like 460212244. Can anyone show me how to do this asap?

Also,
If electricity costs 17 cents per kilowatt-hour,
how much does it cost to run the compressor
each day? Answer in units of cents.

What energy is produced by a 300 W light-
bulb lit for 5 hours? Answer in units of J.

Normally the rate at which you expend energy
during a brisk walk is 3:5 calories per minute.
(A calorie is the common unit of food energy,
equal to 0:239 Joules.)
How long do you have to walk in order to
produce the same amount of energy as in a
candy bar (approximately 280 cal)? Answer
in units of min.

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One Response to “Physics Help.asap?”

  1. T R on June 6th, 2009 8:48 pm

    A) Convert 29 hp to Watts, which is also equal to Joules per second. Multiply that by the number of seconds in a day, and that will be the answer in Joules

    B) Convert the answer above to kW-hrs. 29 * 0.750 * 24 = energy used in kW-hrs. Multiply that by 17 cents per kW-hr.

    C) 300 W = 300 Joules per sec, and multiply by the time (5 hours * 3600 sec/hour) to get Joules

    D) You should be well prepared to answer this kind of problem after you’ve done the above.