Question

**(13%)** **Problem 8:**
An elevator motor lifts a 2300-kg load a height of 38 m
in 13.5 s.

**Part (a)** Find the useful power output of the
elevator motor, if it also increases the speed from rest to 3.9
m/s. Assume that the total mass of the counterbalanced system is
10,000 kg — so that only 2300 kg is raised in height, but the full
10,000 kg is accelerated.

**Part (b)** How much does it cost, in dollars per
hour, if the electricity cost is $0.085 per kW⋅h?

Answer #1

change unit carefully. Hope you got. Rate my answer please

(a) Find the useful power output of an elevator motor that lifts
a 2400-kg load a height of 35.0 m in 12.0 s, if it also increases
the speed from rest to 4.0 m/s. Note that the total mass of the
counterbalanced system is 10000 kg—so that only 2400 kg is raised
in height, but the full 10000 kg is accelerated.
(b)What does it cost, if electricity is $0.09 per kW ⋅ h ?
Thank you

(a)
Find the useful power output (in W) of an elevator motor that
lifts a 2600 kg load a height of 45.0 m in 12.0 s, if it also
increases the speed from rest to 4.00 m/s. Note that the total mass
of the counterbalanced system is 10,000 kg—so that only 2600 kg is
raised in height, but the full 10,000 kg is accelerated.
W
(b)What does it cost (in cents), if electricity is $0.0900 per
kW · h?
cents

(a) Find the useful power output (in W) of an elevator motor
that lifts a 2700 kg load a height of 25.0 m in 12.0 s, if it also
increases the speed from rest to 4.00 m/s. Note that the total mass
of the counterbalanced system is 10,000 kg—so that only 2700 kg is
raised in height, but the full 10,000 kg is accelerated.
W
(b) What does it cost (in cents), if electricity is $0.0900 per
kW · h?...

(a) How high a hill can a car coast up (engine disengaged) if
friction is negligible and its initial speed is 106 km/h? 44.18
Correct: Your answer is correct. m
(b) If, in actuality, a 750 kg car with an initial speed of 106
km/h is observed to coast up a hill to a height 20.0 m above its
starting point, how much thermal energy was generated by friction?
177.87 Incorrect: Your answer is incorrect. J
(c) What is the...

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