Physics · Circular Motion & Momentum
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An angular displacement of 90o is equal to:
- A
One-fourth revolution
- B
One-third revolution
- C
One-half revolution
- D
One complete revolution
An angular displacement of 90 degrees represents a quarter of a full circle, as a complete revolution is 360 degrees. Therefore, when you divide 90 by 360, you get 1/4, indicating that 90 degrees is one-fourth of a revolution. The other options do not accurately represent this fraction:
One-third revolution (120 degrees) is incorrect as it exceeds 90 degrees.
One-half revolution (180 degrees) is also incorrect as it is greater than 90 degrees.
One complete revolution (360 degrees) is incorrect because it represents the full circle, not just the quarter indicated by 90 degrees.
This is correct because 90 degrees is one-fourth of 360 degrees, which represents a full revolution.
This option is incorrect because one-third of a revolution would be 120 degrees (360/3), not 90 degrees.
This option is incorrect since one-half of a revolution is 180 degrees (360/2), which is greater than 90 degrees.
This option is incorrect because one complete revolution corresponds to 360 degrees, while the question refers to only 90 degrees.
Tagged under Physics · Circular Motion & Momentum · 2025