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Motion in a Plane :: Discussion
| 21. | A stone tied to the end of string 80cm long is whirled in horizontal circle with a constant speed. If the stone makes 14 revolutions in 25 sec, what is the magnitude of acceleration of the stone? | |
| A. | 680 cm/s2 | |
| B. | 860 cm/s2 | |
| C. | 720 cm/s2 | |
| D. | 990 cm/s2 | |
| Answer: Option D | |
| Explanation: | |
|
a = rω2 = r(2πn/t)2 a = (80×4×(22/7)2×142 )/142 = 990cm/s2 . |
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