A stone is whirled in a vertical circle at the end of an inelastic string. When the stone is at the highest position, the tension in the string will be
Correct answer: A. Minimum.
- A. Minimum.
- B. Maximum.
- C. Less than the mass of the stone.
- D. Equal to the weight of the stone.
Explanation
At the highest position, the tension in the string is T=mv2/r-mgIt is minimum at the top of the circle, and can be zero if the speed is just enough to maintain circular motion. Options A, C, and D incorrectly describe tension as being insufficient to maintain circular motion.
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About Angular Velocity
Angular velocity describes how quickly angular displacement changes with time, with ω = Δθ/Δt and units of radians per second. Questions relate angular and linear motion through v = rω, use the direction given by the right hand rule, and distinguish angular velocity from angular acceleration and ordinary frequency.
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