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I have no idea: David drove a distance(d) of 187km, to 3 sig.fig. He used 28 litres of petrol(p), to 2 sig.fig. The petrol consumption(c)in km per litre is given by the formula:…
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I have no idea: David drove a distance(d) of 187km, to 3 sig.fig. He used 28 litres of petrol(p), to 2 sig.fig. The petrol consumption(c)in km per litre is given by the formula:…
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Mar 12, 2019
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I have no idea:
David drove a distance(d) of 187km, to 3 sig.fig. He used 28 litres of petrol(p), to 2 sig.fig.
The petrol consumption(c)in km per litre is given by the formula: c= d/p
By considering bounds, work out the value of c, to a suitable degree of accuracy. You must show your working and give a reason for your answer.
Thank You!
Mathematics
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Michael Burr
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So we have the formula:
where
is the distance in kilometers
is the petrol in liters
is the petrol consumption in kilometers per liter
We now for our problem that
David drove a distance of 187 km, so
. We also know that he used 28 liters of petrol, so
. Lets replace those values in our formula to find the petrol consumption:
Now, remember that are some rules to determine the number of significant figures in a number:
1. Non-zero digits are always significant figures.
2. A zero between tow significant figures is always a significant figure.
Applying those tow rules we realize that
has 6 significant figures, whereas
has three significant figures and
only two. In mathematical operations with significant figures, the answer should be given with the same significant figures as the number with least significant figures involved in the operations. In our case, that number is
, and
has two significant figures, so our answer should have 2 significant figures. To give our answer with 2 significant figures, we are going to round it:
We can conclude that the patrol consumption of David's vehicle is
6.7 kilometers per liter
.
Isaac Rosado
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Mar 17, 2019
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Isaac Rosado
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