If a heavy barrel is rolled up a plane inclined at 30° to the horizontal. its velocity ratio will be?
A. 3.0 B. 3.1 C. 3.2 D. 2.0 Correct Answer: Option D = 2.0 Explanation V.R = (1)/sinθ = (1)/sin 30 = (1)/(1)/2 = 2
An object of mass 80kg is pulled on a horizontal rough ground by a force of 500N. Find the coefficient of static friction. [g = 10 ms‾²]
A. 0.8 B. 0.4 C. 1.0 D. 0.6 Correct Answer: Option D – 0.6 Explanation coefficient of friction = (F)/R = (F)/ mg = (500)/80 x 10 = 0.625
If a cage containing a truck of coal weighing 750 kg is raised to a height of 90m in a minute. What is the total power expended? [g = 10 ms‾²]
A. 11.50 kw B. 12.60 kw C. 11.25 kw D. 12.10 kw Correct Answer: Option C – 11.25 kw Explanation Power = (work done)/time taken = (mgh)/t = (750 x 10 x 90)/60 = 11250w = 11.25kw
Which of the motions below is simple harmonic?
I. The motion of the tyres of a moving car. II. The motion of a loaded test tube oscillated vertically. III. The beating of the heart. IV. A stone tied to a string and whirled round. V. The motion of the pistons in a gasoline engine. A. III, IV and V only B. II, III...
A bullet fired vertically from upward from a gun held 2.0m above the ground reaches its maximum height in 4.0s. calculate its initial velocity. [g = 10ms‾²]
A. 10 ms‾¹ B. 8 ms‾¹ C. 40 ms‾¹ D. 20 ms‾¹ Correct Answer: Option C – 40 ms‾¹ Explanation At maximum height, the final velocity, v = 0 thus from v = u + at 0 = u – at ∴ U = at = 10 x 4 = 40...Products
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