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Physics 2001 WAEC Past Questions

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11

Which of the following statements about elastic collision is correct?

  • A. momentum is lost due to the sound produced
  • B. loss of momentim is equal to loss in kinetic energy
  • C. both kinetic energy and momentum are conserved
  • D. kinetic energy is lost while momentum is conserved
View Answer & Discuss (2) WAEC 2001
12

Electrical resistance is a property of an electrical energy to be converted into

  • A. mechanical energy
  • B. heat energy
  • C. magnetic energy
  • D. chemical energy
View Answer & Discuss (2) WAEC 2001
13
A simple machine with an efficiency of 75% lifts a load of 5000N when a force of 500N is applied to it. Calculate the velocity ratio of the machine
  • A. 10.0
  • B. 13.3
  • C. 17.5
  • D. 25.0
View Answer & Discuss WAEC 2001
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14
A screw jack with a Tommy bar of length 12cm is used to raise a car through a vertical height of 25cm by turning the Tommy bar through 50 revolutions. Calculate the approximate velocity ratio of the jack [\(\pi = 3.142\)]
  • A. 21
  • B. 38
  • C. 48
  • D. 151
View Answer & Discuss (5) WAEC 2001
15
a beam PQ pivoted at P carries a load of 80N as shown above. Calculate the effort E, required to keep it horizontal. [neglect the weight of the beam]
  • A. 32.0N
  • B. 26.7N
  • C. 16.0N
  • D. 13.3N
View Answer & Discuss (2) WAEC 2001
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