A ball of mass 0.1 𝑘𝑔. Is whirled in a horizontal circle of radius 1 𝑚. By means of a string at an initial speed of 10 𝑅. 𝑃. 𝑀. Keeping the radius constant, the tension in the string is reduced to one quarter of its initial value. The new speed is

April 18, 2022

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Physics Problems

Question : A ball of mass 0.1 𝑘𝑔. Is whirled in a horizontal circle of radius 1 𝑚. By means of a string at an initial speed of 10 𝑅. 𝑃. 𝑀. Keeping the radius constant, the tension in the string is reduced to one quarter of its initial value. The new speed is

(A) 5 𝑟. 𝑝. m

(B) 10 𝑟. 𝑝. m

(D) 14 𝑟. 𝑝. m

Answer : option (A)

Solution :

A ball of mass 0.1 𝑘𝑔. Is whirled in a horizontal circle of radius 1 𝑚. By means of a string at an initial speed of 10 𝑅. 𝑃. 𝑀. Keeping the radius constant, the tension in the string is reduced to one quarter of its initial value. The new speed is