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.