Question

An elevator car has a mass of *1500 kg* carry 3
passengers with a total mass of *330 kg*. The lift operates
with a constant frictional force of *2 700 N* working
against the motion of the elevator.

How much power must the motor deliver to the elevator cart to
keep it moving at a constant speed of *2.4
m**s**-1* ?

How much power would need to be supplied by the motor if it was 70% efficient?

Answer #1

An elevator car has a mass of 1600 kg and is carrying passengers
having a combined mass of 300 kg. A constant friction force of 4000
N retards its motion.
How much power must a motor deliver to lift the elevator car and
its passengers at a constant speed of 3.00 m/s _____.
a. 4.39e4 W
b. 6.79 e4 W
c. 5.02e4 W
d. 2.62e4 W

An elevator has a mass of 2,000 kg and is carrying a load of
passengers with a combined mass of 250 kg. A constant friction
force of 3,000 N retards the motion of the elevator. recall; P =
dW/dt
a) How much power must the motor provide to lift the car at a
constant speed of 4 m/s?
b) How much power is required to provide the elevator car with
9.8 m/s^2 of acceleration at 1 m/s vs 4 m/s?

An elevator car including the passengers has a mass of 1100 kg
and travels downwards at constant speed of 4.000 m/s for 32.00 m.
The force of friction averaging 80.00 N acts on the elevator. The
work done by the force of gravity; the work done by the force of
friction; and the work done by the cable supporting the elevator
during the 32.00 m excursion were (in that order, in kJ):
Answer: 345.0; -2.560; -342.4

An elevator filled with passengers has a mass of 1583 kg.
(a) The elevator accelerates upward from rest at a rate of 1.20
m/s2 for 2.00 s. Calculate the tension in the cable (in
N) supporting the elevator.
(b)The elevator continues upward at constant velocity for 9.22
s. What is the tension in the cable (in N) during this time?
(c)The elevator decelerates at a rate of 0.600 m/s2
for 4.00 s. What is the tension in the cable (in...

A loaded ore car has a mass of 950 kg and rolls on rails with
negligible friction. It starts from rest and is pulled up a mine
shaft by a cable connected to a winch. The shaft is inclined at
28.5° above the horizontal. The car accelerates uniformly to a
speed of 2.05 m/s in 12.5 s and then continues at constant
speed.
(a) What power must the winch motor provide when the car is
moving at constant speed?
kW...

ch 6
1:
It is generally a good idea to gain an understanding of the
"size" of units. Consider the objects and calculate the kinetic
energy of each one.
A ladybug weighing 37.3 mg
flies by your head at 3.83 km/h
.
×10
J
A 7.15 kg
bowling ball slides (not rolls) down an alley at 17.5 km/h
.
J
A car weighing 1260 kg
moves at a speed of 49.5 km/h.
5:
The graph shows the ?-directed force
??...

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