QUESTION: Why is loud sound heard at RESONANCE?
ANSWER: Loud sound is heard at RESONANCE because amplitude increases when external frequency is equal or integral multiple of the natural frequency of vibrating body.
Which is always constant for a machine of given design: MA or VR ? Ans: VR remains constant for a machine of given design as it depends on the distances moved by the load and effort but MA can vary due to the friction developed between the moving parts of the machine.
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