Beats of frequency 4hz are heard when a tuning fork of, Ask an Expert

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Q. Beats of frequency 4Hz are heard when a tuning fork of frequency 1000Hz and a vibrating wire are sounded together. What is frequency of the wire?

Q. A 550g ball swings in a vertical circle at the end of a 1.3 m long string. When the ball is at the bottom of the circle, tension in the string is 13N. What is the speed of the ball at that point?

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