(b) Figure 4 shows the 70 kg concrete block is pull by electric motor. The force or tension in cable is about F = (120r2) N, that the t is in seconds. By using Principle of Newton Law, determine the concrete block's velocity for t = 6 s. Assuming it is originally at rest and the coefficient of static and kinetic friction between the concrete bock and the floor surface are about us = 0.5 and uk = 0.4, respectively. [Rajah 4 menunjukkan blok konkrit 70 kg ditarik oleh motor elektrik. Daya atau tegangan dalam kabel adalah F = (120t2) N, yang mana t adalah dalam saat. Dengan menggunakan Prinsip undang-undang Newton, tentukan halaju blok konkrit untuk t = 6 s. Anggap keadaan asal blok konkrit adalah dalam keadaan rehat dan pekali geseran statik dan kinetik di antara blok konkrit dan permukaan lantai masing- masing adalah µs = 0.5 dan uk = 0.4.] Cable Concrete Block Motor Figure 4 [Rajah 4]

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answer question b) & c)
(c) Referring to Figure 5, the hoist machine has a mass of 800 kg and the counterweight
C has a mass of 130 kg. At a given instant, the hoist machine motion upward with
velocity of 2 m/s an acceleration of 1.5 m/s. The tension in cable to draw the hoist
machine by the motor can withstand a maximum tension of 4500 N. Power input to the
motor is about 22 kW. Based on Figure 5, if the motor has not operated at its maximum
efficiency and the efficiency of motor needs to be increased by 10%, suggest a suitable
parameter that should be changed on the system. Justify your answer with calculation.
(Merujuk Rajah 5, mesin angkat mempunyai jisim 800 kg dan keseimbangan berat berjisim 130 kg. Pada
kedudukan tersebut, mesin angkat bergerak ke atas dengan halaju 2 m/s dan pecutan 1.5 m/s. Tegangan
dalam kabel untuk menarik mesin angkat oleh motor boleh menahan maksimum ketegangan 4500 N.
Input kuasa motor adalah lebih kurang 22 kW. Berdasarkan Rajah 5 tersebut, jika kecekapan motor
pada masa itu tidak berada pada kecekapan maksimum dan ia perlu dinaikkan sebanyak 10 %,
cadangkan parameter yang sesuai yang perlu ditukar pada sistem tersebut. Justifikasikan jawapan anda
dengan bantuan pengiraan.]
Figure 5
[Rajah 5]
Transcribed Image Text:(c) Referring to Figure 5, the hoist machine has a mass of 800 kg and the counterweight C has a mass of 130 kg. At a given instant, the hoist machine motion upward with velocity of 2 m/s an acceleration of 1.5 m/s. The tension in cable to draw the hoist machine by the motor can withstand a maximum tension of 4500 N. Power input to the motor is about 22 kW. Based on Figure 5, if the motor has not operated at its maximum efficiency and the efficiency of motor needs to be increased by 10%, suggest a suitable parameter that should be changed on the system. Justify your answer with calculation. (Merujuk Rajah 5, mesin angkat mempunyai jisim 800 kg dan keseimbangan berat berjisim 130 kg. Pada kedudukan tersebut, mesin angkat bergerak ke atas dengan halaju 2 m/s dan pecutan 1.5 m/s. Tegangan dalam kabel untuk menarik mesin angkat oleh motor boleh menahan maksimum ketegangan 4500 N. Input kuasa motor adalah lebih kurang 22 kW. Berdasarkan Rajah 5 tersebut, jika kecekapan motor pada masa itu tidak berada pada kecekapan maksimum dan ia perlu dinaikkan sebanyak 10 %, cadangkan parameter yang sesuai yang perlu ditukar pada sistem tersebut. Justifikasikan jawapan anda dengan bantuan pengiraan.] Figure 5 [Rajah 5]
(b) Figure 4 shows the 70 kg concrete block is pull by electric motor. The force or tension
in cable is about F = (120z2) N, that the t is in seconds. By using Principle of Newton
Law, determine the concrete block's velocity for t = 6 s. Assuming it is originally at
rest and the coefficient of static and kinetic friction between the concrete bock and the
floor surface are about us = 0.5 and uk = 0.4, respectively.
[Rajah 4 menunjukkan blok konkrit 70 kg ditarik oleh motor elektrik. Daya atau tegangan dalam kabel
adalah F = (120t2) N, yang mana t adalah dalam saat. Dengan menggunakan Prinsip undang-undang
Newton, tentukan halaju blok konkrit untuk t = 6 s. Anggap keadaan asal blok konkrit adalah dalam
keadaan rehat dan pekali geseran statik dan kinetik di antara blok konkrit dan permukaan lantai masing-
masing adalah µs = 0.5 dan uk = 0.4.]
Cable
Concrete
Block
Motor
Figure 4
[Rajah 4]
Transcribed Image Text:(b) Figure 4 shows the 70 kg concrete block is pull by electric motor. The force or tension in cable is about F = (120z2) N, that the t is in seconds. By using Principle of Newton Law, determine the concrete block's velocity for t = 6 s. Assuming it is originally at rest and the coefficient of static and kinetic friction between the concrete bock and the floor surface are about us = 0.5 and uk = 0.4, respectively. [Rajah 4 menunjukkan blok konkrit 70 kg ditarik oleh motor elektrik. Daya atau tegangan dalam kabel adalah F = (120t2) N, yang mana t adalah dalam saat. Dengan menggunakan Prinsip undang-undang Newton, tentukan halaju blok konkrit untuk t = 6 s. Anggap keadaan asal blok konkrit adalah dalam keadaan rehat dan pekali geseran statik dan kinetik di antara blok konkrit dan permukaan lantai masing- masing adalah µs = 0.5 dan uk = 0.4.] Cable Concrete Block Motor Figure 4 [Rajah 4]
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