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The work done by a friction force is:
a) Always positive
b) Always negative
c) Always zero
d) Either positive or negative depending upon the situation.
Ans: The work done by a friction force is always negative.
what do you mean by banking of roads?why is it done?a train has to negotiate a curve of radius 400m.by how must the outer rail is raised as compared with the inner rail for a speed
A stack emitting 85 g/s of NO has an effective stack height of 100 m. The wind speed is 3 m/s at 10 m, and it is a cloudy summer day. Estimate ground level NO concentration:
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The opposition offered to the circular motion of bodies like sphere, disc, ring, cylinder etc. on another surface is known as rolling friction.
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#question.give the constraint relation between .
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concave grating and rowland''s mounting theory
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