Four students run up a flight of stairs. Below are their masses, time it takes t

Question

Four students run up a flight of stairs. Below are their masses, time it takes to run, and the total height of the stairs they run. (Not the length of stairs) Rank in order from smallest to largest, their power outputs : A. 80kg, 8 seconds, 1 flight= 10m B. 64kg, 20 seconds, 3 flight= 30m C. 80kg, 25 seconds, 2 flight= 20 m D. 64kg, 8 seconds, 1 flight= 10m Four students run up a flight of stairs. Below are their masses, time it takes to run, and the total height of the stairs they run. (Not the length of stairs) Rank in order from smallest to largest, their power outputs : A. 80kg, 8 seconds, 1 flight= 10m B. 64kg, 20 seconds, 3 flight= 30m C. 80kg, 25 seconds, 2 flight= 20 m D. 64kg, 8 seconds, 1 flight= 10m Rank in order from smallest to largest, their power outputs : A. 80kg, 8 seconds, 1 flight= 10m B. 64kg, 20 seconds, 3 flight= 30m C. 80kg, 25 seconds, 2 flight= 20 m D. 64kg, 8 seconds, 1 flight= 10m

Explanation / Answer

given

the power is P = W/t = mgh /t W

PA = 80*9.8*10 /8 w = 980 W

PB = 64*9.8*30 /20 w = 940.8 W

PC = 80*9.8*20/25 W = 627.20 W

PD = 64*9.8*10/8 W = 784 W

now the ranking from smallest to largest is  

Pc < PD < PB < PA

Related Questions

Navigate

• Browse (All)
• Browse F
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.