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Question 3.5: A defibrillator gives a high-energy shock of 360 J. What is ...

A defibrillator gives a high-energy shock of 360 J. What is this quantity of energy in calories?

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STEP 1   State the given and needed quantities.

ANALYZE THE PROBLEM Given Need Connect
360 J calories energy factor

STEP 2   Write a plan to convert the given unit to the needed unit.

joules  \boxed{\begin{array}{l}Energy \\factor\end{array}} \rightarrow   calories

STEP 3   State the equalities and conversion factors.

\boxed{\begin{array}{l}             1  cal = 4.184  J \\ \frac{4.184  J}{1  cal}         and        \frac{1  cal}{4.184  J}\end{array}} \rightarrow

STEP 4   Set up the problem to calculate the needed quantity.

360  \cancel{J}   \times   \overset{Exact }{\underset{Exact }{\boxed {\frac{1  cal}{4.184  \cancel{J}}} }}   =   \underset{Two  SFs }{86  cal}  

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