The potential energy in an elastic string of force constant K which has been extended by X metres is expressed as
A. ½kX² B. kX² C. ½kX D. kX Correct Answer: Option A A. ½kX²Which of the following statements about the mouthpiece of a telephone is correct? It converts sound energy into?
A. acoustic energy B. mechanical energy C. electrical energy D. heat energy Correct Answer: Option C C. electrical energyA stone of mass 2.0kg is thrown vertically upward with a velocity of 20.0 ms‾¹, calculate the initial kinetic energy of the stone.
A. 200J B. 400J C. 800J D. 1600J Correct Answer: Option B B. 400J Explanation K.E = ½Mv²=12×2×20² = 400JWhich of the following source of energy is renewable?
A. petroleum B. charcoal C. hydro D. nuclear Correct Answer: Option C C. hydroProducts
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