Question

A disk can rotate about its central axis like a merry-go-round. Which of the following pairs of values for its initial and final angular positions, respectively, give a negative angular displacement: (a)-3 rad, +5 rad,(b)-3 rad,-7 rad, (c) 7 rad,-3 rad?
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Answer 1

Answer:

b and c

Explanation:

For posterity, please make sure that questions of this kind go under the "physics" or "science" category and not under "English" as doing so might get you a better guide.

As for your question, angular displacement is essentially the angle between the initial and final angular configurations. To put it simply,

angular displacement = final angular position - initial angle position.

Find which pair(s) give you a negative value.

(b) and (c) both give negative values and display anticlockwise rotation, hence, they're the pairs you're looking for.

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