hiro walks up a flight of stairs in his apartment building. later in the day, he runs up the same flight of…

hiro walks up a flight of stairs in his apartment building. later in the day, he runs up the same flight of stairs. which statement about work and power describes hiros actions? he did more work running than walking. he did more work walking than running. he had more power running than walking. he had more power walking than running.

hiro walks up a flight of stairs in his apartment building. later in the day, he runs up the same flight of stairs. which statement about work and power describes hiros actions? he did more work running than walking. he did more work walking than running. he had more power running than walking. he had more power walking than running.

Answer

Explanation:

Step1: Recall work formula

Work (W = Fd\cos\theta). Here, force (F) is Hiro's weight, distance (d) is the height of the stairs, and (\theta = 0^{\circ}) (force and displacement are in the same - direction). Since weight and height of stairs are the same for walking and running, work done is the same ((W_{walk}=W_{run})).

Step2: Recall power formula

Power (P=\frac{W}{t}). Running takes less time ((t_{run}<t_{walk})) than walking for the same work (W). Since (P) is inversely proportional to (t) when (W) is constant, (P_{run}>P_{walk}).

Answer:

He had more power running than walking.