A kayaker paddles with a power output of 490 W to maintain a steady speed of 1.50 m/s. What is the resistive force exerted by the water on the kayak?

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A kayaker paddles with a power output of 490 W to maintain a steady speed of 1.50 m/s. What is the resistive force exerted by the water on the kayak?

2 Answers

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Answer 1 · 2015-12-07T21:45:11

$326.6"N"$

Explanation:

Using dimensional analysis:

Watts = $"N"."m.s"^(-1)$

$:.("N".cancel("m.s"^(-1)))/(cancel("m.s"^(-1)))="N"$

$:.F=490/1.5=326.6"N"$

Answer 2 · 2015-12-07T23:44:15

I found $163.3N$ but check my method (whether it makes sense or not!).

Explanation:

Have a look:
enter image source here
I considered the fact that the kayaker has to put energy to push the kayak and to overcome water resistance...I think.

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A kayaker paddles with a power output of 490 W to maintain a steady speed of 1.50 m/s. What is the resistive force exerted by the water on the kayak?

2 Answers

Explanation:

Explanation:

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