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3846

A spiral spring has a length of 14cm when a force of 4N is hung on it. A force of 6N extends the spring by 4cm. Calculate the unstretched length of the spring

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3847

(a) State two factors on which surface tension depends.

(b) How can mosquito larvae be made to sink in stagnant water?

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3848

 List three advantages of fluorescent tubes over filament bulbs.

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3849

List three advantages of p - n junetion diode over diode valve.

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3850

(a) State two deductions that can be made from a displacement-time graph.

(b) If the distance beween two equal masses is doubled and their individual masses are also doubled, what would happen to the force between them? Support your answer quantitatively.

(c) State two factors that affect the maximum height attained by a bullet fired from a gun.

(d) State two practical examples of mechanical resonance. A body is released from rest at the top of a plane inclined at 30° to the horizontal and 4.0 m high. If the coefficient of friction between the body and the plane is 0.3, calculate the time the body takes to reach the bottom of the plane.

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