Asked by Elizabeth
Jillian wants to buy candles for winter, in case her electricity and furnace fail. Each candle she plans to use, burns at a rate of 5 mL of was per 15 cm. How many HOURS will it take the candle to burn down completely?
Express the answer to the NEAREST WHOLE NUMBER. (Note: 1mL = 1 cm cubed)
(Hint: A candle is a cylinder; use 3.14 as an estimate for pi.)
I have no idea how to start this. Please show me. Thanks!
Express the answer to the NEAREST WHOLE NUMBER. (Note: 1mL = 1 cm cubed)
(Hint: A candle is a cylinder; use 3.14 as an estimate for pi.)
I have no idea how to start this. Please show me. Thanks!
Answers
Answered by
drwls
You need to restate the question and look for additional information. 5 ml of WAX per 15 cm is NOT a rate. You need ml per unit time and you also need to know the radius of the candle.
I supect you left out some words by mistake, like the length of time it takes to burn 5 ml, and the radius (which might be what the 15 cm is supposed to be).
I supect you left out some words by mistake, like the length of time it takes to burn 5 ml, and the radius (which might be what the 15 cm is supposed to be).
Answered by
Elizabeth
I'm so sorry, i messed up my spelling.
Each candle she plans to use, burns at a rate of 5 mL of wax per 15 min. One of these candles has a diameter of
8 cm and a height of 15 cm. How many hours will is take the candle to burn down completely? Express your answer to the NEAREST WHOLE NUMBER. (Note: 1mL = 1 cm cubed) (Hint: A candle is a cylinder; use 3.14 as an estimate for pi.)
Each candle she plans to use, burns at a rate of 5 mL of wax per 15 min. One of these candles has a diameter of
8 cm and a height of 15 cm. How many hours will is take the candle to burn down completely? Express your answer to the NEAREST WHOLE NUMBER. (Note: 1mL = 1 cm cubed) (Hint: A candle is a cylinder; use 3.14 as an estimate for pi.)
Answered by
drwls
The candle burns at a rate of 5/15 = 1/3 cm^3 (cubic cm) per minute. A candle with the dimensions you described has a volume of
V = (pi*D^2/4)*Height = 753.6 cm^3
The time that it takes to burn is
(Volume)/(burn rate)
= 753.6 cm^3/(1/3 cm^/min)
= 2261 minutes = 37.6 hours. They want you to round that off to 38 hours.
V = (pi*D^2/4)*Height = 753.6 cm^3
The time that it takes to burn is
(Volume)/(burn rate)
= 753.6 cm^3/(1/3 cm^/min)
= 2261 minutes = 37.6 hours. They want you to round that off to 38 hours.
Answered by
Elizabeth
how did you get the 2261 min?
Answered by
Elizabeth
when I divide the volume by the burn rate, i get the answer 251.2 min.
There are no AI answers yet. The ability to request AI answers is coming soon!
Submit Your Answer
We prioritize human answers over AI answers.
If you are human, and you can answer this question, please submit your answer.