13.A mass of 2 kg suspended with thread AB (figure). Thread CD of the same type is attached to the other end of 2 kg mass. Lower thread is pulled gradually, harder and harder in the downward direction, so as to apply force on AB. Which of the threads will break and why?
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Explanation:
Thread AB breaks down we pull the lower thread slowly then upper thread would break . This is because already the upper thread is having tension due to weight of the 2 kg mass . Addition tension is applied to this thread by pulling . Hence chances are more for upper thread to get broken first .
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