A body moves in a circle of radius 4 m with constant speed 8m/s experiences centripetal force 128N. What is the mass of body?
Correct answer: B. 8Kg
- A. 2Kg
- B. 8Kg
- C. 4Kg
- D. 16Kg
Explanation
The correct answer is option B: 8Kg. When applying the formula Fc=mv2/r with the given values, the calculation results in a mass of 8Kg. This aligns with option B. Options A, C, and D are incorrect because their respective mass calculations do not match the correct value obtained through the formula.Fc=mv2/r m=Fc*r/v2m = (128 N × 4 m) / (8 m/s)² m = 512 / 64 m = 8Kg
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Rotational motion relates angular displacement, angular velocity and angular acceleration to linear displacement, tangential velocity and tangential acceleration through the radius. Questions use radians, v equals r omega and tangential acceleration, while distinguishing tangential velocity from centripetal acceleration and angular quantities from their linear counterparts.
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