Two spanners X and Y of lengths 15cm and 20cm respectively are used in turn to give a screw of pitch 2mm one complete rotation. If Rx and Ry are the respective velocity ratios of the spanners then the ratio Rx : Ry is

  • A 1 : 50
  • B 3 : 20
  • C 3:4
  • D 4:3
  • E 20:3
waec 1996physics

The correct answer is C. 3:4

Rx = 15/0.2 = 75

Ry = 20/0.2 = 100

Rx : Ry = 75 : 100 = 3 : 4

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