One kilowatt·hour (kW·h) is the amount of work orenergy generated when one kilow

Question

One kilowatt·hour (kW·h) is the amount of work orenergy generated when one kilowatt of power is supplied for a timeof one hour. A kilowatt·hour is the unit of energy used bypower companies when figuring out your electric bill. Determine thenumber of joules of energy in one kilowatt·hour.
1_________ J

In 2.0 minutes, a ski lift raises 3 skiersat constant speed to a height of 190 m.The average mass of each skier is 65 kg. What is the average powerprovided by the tension in the cable pulling the lift?
1_________ W

Explanation / Answer

1 kW – h = 10^ 3 W * 3600 s

              = 3600 * 10 ^ 3 W s

             = 36 * 10 ^ 5 J

(b). time t= 2 min

               = 120 s

Height h = 190 m

Mass m = 65 kg

Mass of three skiers M ‘ = 3m = 195 kg

Average power = M’ gh / t

                         = 3025.75 W

Related Questions

Navigate

• Browse (All)
• Browse O
• Subjects

---

---

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