A device that converts mechanical energy into electrical energy is?
A. a dynamo B. an electric motor C. an induction coil D. a transformer Correct Answer: Option A A. a dynamoThe period of a simple pendulum X is 5s. What is the period of a simple pendulum Y which makes 50 vibrations in the same time it takes X to make 20 vibrations?
A. 12.5s B. 2.5s C. 2.0s D. 1.2s Correct Answer: Option A A. 12.5s Explanation Tx=20/5=4s Ty=50/4=12.5sThe diagram above illustrates a uniform metre rule which is balanced on a pivot by some masses. Calculate the value of M
A. 500.0g B. 400.0g C. 44.4g D. 25.0g Correct Answer: Option D D. 25.0g Explanation clockwise moment = Anti-clock wise moment = M x 40 = 100 x 10 M = 1000/40 = 25gA car starts from rest and covers a distance of 40m in 10s. Calculate the magnitude of its acceleration?
A. 0.25 ms‾² B. 0.80 ms‾² C. 3.20 ms‾² D. 4.00 ms‾² Correct Answer: Option B Explanation S = ut + 12at² 40 = 0 x 10 + ½ x a x 10² 50a = 40 a = 40/50 = 0.8 ms‾²A body is projected vertically upwards with a speed of 10 ms‾¹ from a point 2m above the ground. Calculate the total time taken for the body to reach the ground. [g = 10ms‾²]
A. 1.00s B. 2.00s C. 2.18s D. 3.00s Correct Answer: Option B B. 2.00s Explanation T = 2u/g = 2×10/10 = 2sProducts
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