Posted by Elizabeth on Thursday, January 17, 2008 at 6:08pm.
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'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.)
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.
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