While steaming at 12 knots, your vessel...

Question 1 / 2707066636eea28f7522a1c51b60d

Question 1 of 2707066636eea28f7522a1c51b60d

While steaming at 12 knots, your vessel burns 45 tons of fuel per day. What will be the rate of fuel consumption if you decrease speed to 11.5 knots?

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Question 1 of 27070

While steaming at 12 knots, your vessel burns 45 tons of fuel per day. What will be the rate of fuel consumption if you decrease speed to 11.5 knots?

🔍 Key Concepts

• Relationship between speed and fuel consumption (approximately proportional to the cube of speed for many displacement vessels) • Setting up a ratio/proportion between old and new fuel consumption using speeds • Converting the relationship into an equation to solve for new tons/day

💭 Think About

• How does fuel consumption change when speed changes slightly—does it change linearly with speed, or faster/slower than that? • Can you express the new fuel consumption as: old consumption × (new speed ÷ old speed) raised to some power? • Once you find the factor by which fuel use changes, which choice is closest to the adjusted value?

✅ Before You Answer

• Be clear what stays constant (same vessel, same conditions) and what changes (only speed). • Make sure you use the same units for both speeds (knots) and both consumptions (tons/day). • After calculating, check whether the new fuel consumption should be slightly less than 45 tons/day, not drastically different.

Question 1 of 27070

While steaming at 12 knots, your vessel burns 45 tons of fuel per day. What will be the rate of fuel consumption if you decrease speed to 11.5 knots?

36 tons/day

31 tons/day

43 tons/day

40 tons/day

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