Question

A freight elevator in the Burj Khalifa tower in Dubai is lifted from rest by a cable and accelerated to its maximum climb speed in a distance of 3.00 m and within a time interval of 1.73 s. Assume this "lift-off" phase is at constant acceleration.

a) If the average power associated with the tension in the cable is 82.0 kW during the acceleration phase, what is the magnitude of the tension in the cable during this phase?

b) What is the instantaneous power (in kilowatts) associated with the tension in the cable at the moment the elevator has reached its maximum speed?

c) What is the mass of the elevator and its contents?

Answer #1

Q1. The elevators at Burj Khalifa in Dubai are able to
move with a constant velocity of 40 km/hr and are able to lift up
to 2000 kg from ground level to the top floor which is 800 meters
above the ground. Calculate the power required by the elevator
motors to do this. *
Q2. At a show during the Muscat festival a showman who
has a mass of 80 kg, jumps from a height of 12 meters onto a...

A(n) 603 kg elevator starts from rest. It moves upward for 3.88
s with a constant acceleration until it reaches its cruising speed
of 1.78 m/s. The acceleration of gravity is 9.8 m/s 2 . Find the
average power delivered by the elevator motor during this period.
Answer in units of kW.

A 643-kg elevator starts from rest and moves upward for 3.80 s
with constant acceleration until it reaches its cruising speed,
1.69 m/s. (a) What is the average power of the elevator motor
during this period? . hp (b) How does this amount of power compare
with its power during an upward trip with constant speed? (Give the
power during an upward trip with constant speed.) hp

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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