A motor boat moves at a steady speed of 4ms-1 .water resistanceacting on it is 4000N calculatepower?

In physics, power is the rate of doing work. It is the amount of energy consumed per unit time. Having no direction, it is a scalar quantity. In the SI system, the unit of power is the joule per second (J/s), known as the watt in honour of James Watt, the eighteenth-century developer of the steam engine. en.wikipedia.org/wiki/Power_%28physics%29

4000N x 4m/s = 1.6 x 10^4 watt = 16 kw We use Shift-6 for exponents.

physics.nist.gov/cuu/Units/prefixes.html You just have to memorize this stuff, at least the ones you work with all the time. It's ok to bookmark the page so you can look up the others when you run across them. There is a prefix every three powers of ten, except for 100, 10, 1/10, and 1/100. To go from one to another you use the LARD rule: LEFT ADD RIGHT DEDUCT. When moving the decimal to the LEFT you ADD to the power of ten. When going to the RIGHT you DEDUCT from the power of ten.