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?
power = work energy/time
= 400 * 5 / 4 = 500 watts
= .5 Kw
= .5*10^-3 = 5 * 10^-4 Megawatts
.5 kw * 1.34 hp/kw = .67 hp
To calculate the power exerted by Jessie, we can use the formula:
Power = Work / Time
First, let's calculate the work done by Jessie using the formula:
Work = Force × Distance
Given that the force is 400N and the distance is 5m, we can substitute these values into the formula:
Work = 400N × 5m = 2000Nm
Now, let's calculate the power using the formula:
Power = Work / Time
Given that the time is 4 seconds, we can substitute these values into the formula:
Power = 2000Nm / 4s = 500W
To convert this power into kilowatts (kW), we divide by 1000:
Power (kW) = 500W / 1000 = 0.5 kW
To convert this power into megawatts (MW), we divide by 1,000,000:
Power (MW) = 500W / 1,000,000 = 0.0005 MW
To convert this power into horsepower (hp), we can use the conversion factor 1 horsepower = 746 watts:
Power (hp) = 500W / 746 = 0.67 hp (approximately)
Therefore, Jessie's power is 0.5 kilowatts (kW), 0.0005 megawatts (MW), and approximately 0.67 horsepower (hp).