If your vessel burns 8 tons of fuel per hour...

Question 1 / 270705eccef9dbacbc34ba4d45dd9

Question 1 of 270705eccef9dbacbc34ba4d45dd9

If your vessel burns 8 tons of fuel per hour at 15 knots, how many tons per hour will it burn at 18 knots?

Question 1 of 27070

If your vessel burns 8 tons of fuel per hour at 15 knots, how many tons per hour will it burn at 18 knots?

🔍 Key Concepts

• Fuel consumption and speed relationship for displacement vessels (fuel use changes with speed, not linearly) • How power required changes when speed changes (think in terms of ratio of speeds) • Converting a known fuel rate at one speed to a fuel rate at a different speed using exponents

💭 Think About

• First, find the ratio between the two speeds (new speed divided by original speed). What number do you get? • For many exam problems on displacement hulls, power (and thus fuel burn per hour) is assumed to vary with roughly the cube of the speed. How would you use that speed ratio with an exponent to get the power (fuel) ratio? • Once you have the new fuel-burn ratio, how do you apply it to the original 8 tons/hour to get the new tons/hour, and which choice is closest?

✅ Before You Answer

• Be sure you are not assuming fuel burn changes directly in proportion to speed — the relationship is steeper. • Double-check your speed ratio calculation (18 ÷ 15) before raising it to a power. • After you compute the new tons/hour, compare it to the original 8 tons/hour and confirm that the change in fuel burn matches the direction and magnitude you’d expect for a modest speed increase.

Question 1 of 27070

If your vessel burns 8 tons of fuel per hour at 15 knots, how many tons per hour will it burn at 18 knots?

9.6 tons

13.8 tons

9.5 tons

11.5 tons

Question 1 / 270705eccef9dbacbc34ba4d45dd9

Question 1 of 270705eccef9dbacbc34ba4d45dd9

If your vessel burns 8 tons of fuel per hour at 15 knots, how many tons per hour will it burn at 18 knots?

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Question 1 of 27070

If your vessel burns 8 tons of fuel per hour at 15 knots, how many tons per hour will it burn at 18 knots?