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     EduGorilla 
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    A hollow iron pipe is 42 cm long and its inner radius is 7 cm. If the thickness of the pipe is 1.5 cm and iron weights 10 gm/cm3, then find the mass of the pipe in kg.

    Options :-

    1. 306.9 kg
    2. 3.069 kg
    3. 30.69 kg
    4. 30 kg
    5. None of these
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