Answer :

Final answer:

The power developed in pushing a 145-kg mass horizontally with a 300.0 N force over 30.0 m in 3.00 s is 3000 watts or 3 kilowatts.

Explanation:

To calculate the power developed by pushing a 145-kg mass horizontally, you need to use the formula for power, which is the work done over time. The work done can be found by multiplying the force by the displacement, as long as the force and displacement are in the same direction. Since a horizontal force of 300.0 N is applied over a distance of 30.0 m, the work done (W) is given by:

W = force × displacement = 300.0 N × 30.0 m = 9000 N·m = 9000 J (joules) since 1 N·m is equivalent to 1 joule.

The time taken to do the work is 3.00 seconds. Therefore, the power (P) can be calculated using:

P = W / t = 9000 J / 3.00 s = 3000 W (watts)

The average power developed by the force in pushing the mass is 3000 watts or 3 kilowatts (kW).

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Rewritten by : Barada

Answer:

3 * 10³J/s

Explanation:

Given :

Force applied, F = 300 N

Distance, d = 30 m

Time, t = 3 seconds

Power, P = Workdone / time

Recall :

Workdone = Force * distance

Workdone = 300 N * 30 m = 9000 Nm

Workdone = 9 * 10³ J

Power = (9 * 10³ J) / 3s

Power = 3 * 10³J/s