Page 13 - TRIAL 2

a) Determine the power requirement of the
escalator in order to move this number of

passengers in this amount of time.
6. A motor lifting a weight 600 g to a height of 15
m in 5 s. The input energy supply to the motor

in one second is 30 J. Determine:

a) Power of the motor

b) Find the power in if the efficiency of the

escalator is 92 %

b) The efficiency of the motor

9. The velocity of a 2 kg trolley is increased from
-1
-1
16 ms to 20 ms over a distance of 15 m. Find:
a) The change in the kinetic energy of trolley.
7. The first asteroid to be discovered is Ceres. It is

the largest and most massive asteroid in our
solar system’s asteroid belt, having an
estimated mass of 3.0 x 1024 g and an orbital
velocity of 17900 m/s. Determine the amount of

kinetic energy possessed by Ceres.

b) The force that acts on the trolley.

10. During the circuit training exercise, Kevin Zahri
runs up the stairs, elevating his 60 kg body a
8. An escalator is used to move 15 passengers vertical distance of 2290 millimeters in a time of
every minute from the first floor of a 0.02 minutes at a constant speed.
department store to the second. The second
floor is located 6 meters above the first floor. a) Determine the work done by Kevin Zahri in
The average passenger's mass is 66.5 kg. climbing the stair case.

12