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746
In the diagram above, AB represents a uniform rod of length 1.50m which is in equilibrium on a pivot at P, If AP = 40cm, calculate the mass of the rod. [g = 10ms-2]
  • A. 0.280kg
  • B. 0.400kg
  • C. 0.613kg
  • D. 0.800kg
View Answer & Discuss (9) WAEC 2002
747

Which of the following statements correctly defines quantitatively the work done by a force? the product of the force and the distance moved

  • A. parallel to the line of action of the force from a reference point
  • B. perpendicular to the line of action of the force from a reference point
  • C. on a line through the reference point
  • D. by the object
View Answer & Discuss (1) WAEC 2002
748
a load of mass120kg is raised vertically through a height of 2m in 30s by a machine whose efficiency is 100%. Calculate the power generated by the machine. [g = 10ms-2]
  • A. 60W
  • B. 80W
  • C. 100W
  • D. 120W
View Answer & Discuss (3) WAEC 2002
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749

A block and tackle system has 6 pulleys. If the efficiency of the machine is 60%, determine its mechanical advantages

  • A. 12.0
  • B. 10.0
  • C. 3.6
  • D. 1.8
View Answer & Discuss (6) WAEC 2002
750
Which of the following actions will improve the efficiency of the pulley system?
  • A. reducing the mass of the pulley
  • B. increasing the friction force between the string and the pulley
  • C. increasing the mass per unit length of the string of the pulley
  • D. increasing the mass of the pulley
View Answer & Discuss (3) WAEC 2002
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