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6

A car of mass 800kg attains a speed of 25m/s in 20 secs. The power developed in the engine is

  • A. 1 . 25 x 104 W
  • B. 2 . 50 x 104 W
  • C. 1 . 25 x 106W
  • D. 2 . 50 x 106 W
View Answer & Discuss (89) JAMB 1999
7
When the brakes in a car are applied, the frictional force force on the tyres is
  • A. is a disadvantage because it is in the direction of the motion of the car
  • B. is a disadvantage because it is in the opposite direction of the motion of the car
  • C. is an advantage because it is in the direction of the motion of the car
  • D. is an advantage because it is in the opposite direction of the motion of the car
View Answer & Discuss (48) JAMB 1999
8
If the stress on a wire is 107NM-2 and the wire is stretched from its original length of 10.00 cm to 10.05 cm. The young's modulus of the wire is
  • A. 5 . 0 x 104 Nm-2
  • B. 5 . 0 x 105 Nm-2
  • C. 2 . 0 x 108 Nm-2
  • D. 2 . 0 x 109 Nm-2
View Answer & Discuss (29) JAMB 1999
9
A solid weigh 10 .00 N in air, 6 N when fully immersed in water and 7 . 0 N when fully immersed in a liquid X. Calculate the relative density of the liquid, X.
  • A. 5/3
  • B. 4/3
  • C. 3/4
  • D. 7/10
View Answer & Discuss (16) JAMB 1999
10
When temperature of a liquid increases, its surface tension
  • A. Decreases
  • B. Increases
  • C. Remain Constant
  • D. Increases then decreases
View Answer & Discuss (37) JAMB 1999
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