A pebble with mass m is attached to a massless cord of length L and whirled in a vertical circle of radius R.a. What is the minimum speed v at the rock’s highest point for which it stays in a circular path? (Hint: possible smallest value of tension force is zero)b. If the speed at the rock’s lowest point in its circular path is twice the value found in part [a], what is the tension in the string when the rock is at this point? 18.A pebble with mass m is attached to a massless cord of length L and whirled in a vertical circle of radius R.What is the minimum speed v at the rock's highest point for which it stays in a circular path? (Hint: possible smallest value oftension force is zero)If the speed at the rock's lowest point in its circular path is twice the value found in part Ja], what is the tension in the string whenthe rock is at this point?а.b.

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18. A pebble with mass m is attached to a massless cord length L and whirled in a vertical circle of radius R. What is the minimum speed v at the rock's highest point for which it stays in a circular path? (Hint: possible smallest value of tension force is zero) If the speed at the rock's lowest point in its circular path is twice the value found in part Ja], what is the tension in the string wher the rock is at this point? a. b.

18. A pebble with mass m is attached to a massless cord length L and whirled in a vertical circle of radius R. What is the minimum speed v at the rock's highest point for which it stays in a circular path? (Hint: possible smallest value of tension force is zero) If the speed at the rock's lowest point in its circular path is twice the value found in part Ja], what is the tension in the string wher the rock is at this point? a. b.