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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 (105) JAMB 1999

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 (51) JAMB 1999

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 (33) JAMB 1999

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 (18) JAMB 1999

When temperature of a liquid increases, its surface tension

A. Decreases
B. Increases
C. Remain Constant
D. Increases then decreases

View Answer & Discuss (43) JAMB 1999

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