A gramophone record takes 5s to reach its constant angular velocity of 4π rads‾¹ from rest. Find its constant angular acceleration.
A. 0.4π rads‾² B. 0.8π rads‾² C. 1.3π rads‾² D. 20.0π rads‾² Correct Answer: Option B = 0.8π rads‾² Explanation From the radiation: V = +at, and if it starts from N & T, U = 0 And for angular motion, W = O + at 4R = aχ5 ∴ a = (4a)/5 = 0. 8π...
The unit of moment of a couple can be expressed in?
A. Nm‾¹ B. Nm‾² C. Nm D. Nm² Correct Answer: Option C = Nm Explanation The unit of a couple is Newton-meter (Nm)
If a convex lens of focal length 12cm is used to produce a real image four times the size of the object, how far from the lens must the object be placed?
A. 10 cm B. 15 cm C. 20 cm D. 25 cm Correct Answer: Option B = 15 cm Explanation Magnifications = V/U = 4 ∴ V = 4U 1/V + 1/U = 1/f 1/4u + 1/U = 1/12 5/4U = 1/12 4U = 12 x 5 = 60 ∴ U = 15...
A body of mass 4 kg resting on a smooth horizontal plane is simultaneously acted upon by two perpendicular forces 6N and 8N. Calculate the acceleration of the motion
A. 2.5 ms¯¹ B. 3.0 ms¯¹ C. 4.0 ms¯¹ D. 4.5 ms¯¹ Correct Answer: Option A = 2.5 ms¯¹Products
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