<problem><script type="loncapa/python">
i = random.randrange(3)
M = ["Big Mac", "Angus Bacon and Cheese", "Quarter Pounder with Cheese"][i]
C = [540, 790, 510][i]

BM = C*1000*4.2
CB = 50*12*3600
</script><startouttext/>
According to McDonald's
<a href="http://nutrition.mcdonalds.com/getnutrition/nutritionfacts.pdf">nutrition
facts</a> a \($M\) provides \($C\) kiloCalories of energy.  (1 dietitian's
calorie is 1000 physicist's calories.)  A typical automobile lead-acid
battery can supply 50 Ampere-hours at 12 Volts.  We can compare these by
converting the energy specifications to common units.  The SI unit of
energy is the Joule=1 Watt-second.  One physicist's calorie is 4.2 Joules.
<endouttext/>
<startouttext/> 
<br/>
How many Joules are there in a \($M\)?
<endouttext/>
<numericalresponse answer="$BM"><responseparam type="tolerance" default="5%" name="tol" description="Numerical Tolerance"/><textline/></numericalresponse>
<startouttext/> 
<br/>
How many Joules are there in a car battery?
<endouttext/>
<numericalresponse answer="$CB"><responseparam type="tolerance" default="5%" name="tol" description="Numerical Tolerance"/><textline/></numericalresponse>
<startouttext/> 
<br/>
Which tastes better? :-)
<endouttext/>

</problem>
