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686
An object R leaves a platform XY with a horizontal velocity of 7m-1 and lands at Q. lf it takes the same object 0.3s to fall freely from Y to P, calculate the distance PQ.(Take g = 1Oms2)
  • A. 7.30m
  • B. 2.55m
  • C. 2.10m
  • D. 1.65m
  • E. 0.45m.
View Answer & Discuss (4) WAEC 1990
687
A simple pendulum makes 50 oscillations in one minute. What is its period of oscillation?
  • A. 0.02s
  • B. 0.20s
  • C. 0.83s
  • D. 1.20s
  • E. 50.00s
View Answer & Discuss (11) WAEC 1990
688
The body P shown in the diagram above is in equilibrium. If the mass Q of the body is 10kg, calculate the tension T in the string. (Take g = 10ms2)
  • A. 20/√3N
  • B. 20N
  • C. 50N
  • D. 200√3N
  • E. 200N
View Answer & Discuss (6) WAEC 1990
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689
An object weighs 10.0 N in air and 7.0 N in water. What is its weight when immersed in a liquid of relative density 1.5?
  • A. 4.50N
  • B. 4.67N
  • C. 5.50N
  • D. 6.67N
  • E. 8.50N
View Answer & Discuss (5) WAEC 1990
690
The absolute zero temperature is defined as the temperature at which
  • A. thermal motion ceases
  • B. the temperature of a gas is 273oC
  • C. ice melts
  • D. the volume of a real gas is maximum
  • E. the pressure of a real gas is maximum
View Answer & Discuss WAEC 1990
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