Physics problem

Question

The electric company uses a unit we will learn about later in this course, the kilowatt-hour (KWHR), to measure your electrical usage.  An average home in the US uses about 10,900 KWHR of electricity every year. If the average cost of electricity is 13.2 cents ($0.132) per KWHR, how much do we pay per day, on average, for electricity? Give your answer in dollars.

 An eight-ounce cup of Starbuck’s cappuccino has 75 mg of caffeine. How many grams of caffeine are in a 3.00 gallon container? 

I got 28,800 just making sure it right.

A delivery truck has an average fuel consumption of 12 miles per gallon (MPG). If the truck travels 60,000 miles per year, and fuel costs $2.45 per gallon, how much is the annual fuel cost for the truck in dollars? 

Answer 1

Hello, Tommy!

First you need to realize that these are not Physics, but rather Math questions by nature.

1. If an average home in the US uses 10,900 KWH a year, their daily usage will be 10,900 : 365 = 29.8 KWH/day. With a cost of $0.132 per KWH, the daily pay for electricity will be $0.132 x 29.8 = $3.9
2. With all the digits being right, your answer is still wrong - it does not contain units and it has to be expressed in grams.
3. I can bet you can do the third question yourself now.