Jessie exerted a force of 400N to move a box across the floor to a distance of5m in 4sec. What is his power is kilowatts? Megawatts? Horsepower?

P = F * d/t = 400 * 5/4 = 500 Watts =

0.500 Kw = 5*10^-4 Megawatts.

Hp = 500Watts/746Watts/Hp = 0.67.

To find Jessie's power, we need to use the formula:

Power = Force x Distance / Time

First, let's convert the force to kilonewtons (kN) since the power unit we need is kilowatts (kW). Remember that 1 kilonewton is equal to 1000 newtons.

Force = 400 N = 400/1000 kN = 0.4 kN

Next, we can substitute the values in the formula:

Power = 0.4 kN x 5 m / 4 s

Power = 0.2 kN m/s

To convert kilonewtons multiplied by meters per second to kilowatts, we divide by 1000. Additionally, to convert kilowatts to megawatts, we divide by another 1000:

Power in kilowatts (kW) = 0.2 kN m/s / 1000 = 0.0002 kW

Power in megawatts (MW) = 0.0002 kW / 1000 = 0.0000002 MW

To convert kilowatts to horsepower, we divide by the conversion factor, which is approximately 0.73549875:

Power in horsepower (hp) = 0.0002 kW / 0.73549875 ≈ 0.0002715 hp

Therefore, Jessie's power is approximately 0.0002 kilowatts, 0.0000002 megawatts, and 0.0002715 horsepower.