# 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?

Dec 7, 2015

$326.6 \text{N}$

#### Explanation:

Using dimensional analysis:

Watts = ${\text{N"."m.s}}^{- 1}$

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

$\therefore F = \frac{490}{1.5} = 326.6 \text{N}$

Dec 7, 2015

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