An object is moving with a velocity of 5ms−¹. At what height must a similar body be situated to have a potential energy equal in value with kinetic energy of the moving body?
A. 25.0m B. 20.0m C. 1.3m D. 1.0m Correct Answer: Option C – 1.3m Explanation P.E = K.E Therefore, h = v²/2g=5²/2×10 = 1.25; Approx 1.3m
A piece of cork floats in a liquid. What fraction of its volume will be immersed in the liquid? [Density of the cork = 0.25 x 10³kgm−³, Density of the liquid = 1.25 x 10³kgm−³]
A. 0.8 B. 0.5 C. 0.2 D. 0.1 Correct Answer: Option C = 0.2 Explanation 0.25×10³/1.25×10³ = 0.2
Calculate the apparent weight loss of a man weighing 70kg in an elevator moving downwards with an acceleration of 1.5ms−² [g = 10ms−²].
A. 686N B. 595N C. 581N D. 105N Correct Answer: Option D – 105N Explanation Wt loss = mg – m (g – a) = 70 x 10 – 70 (10 – 1.5) = 105N
A train with an initial velocity of 20ms−¹ is subjected to a uniform deceleration of 2m−². The time required to bring the train to a complete halt is?
A. 5s B. 10s C. 20s D. 40s Correct Answer: Option B = 10s Explanation t = v−u/a = 0−20/−2 = 10sProducts
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