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If the distance between two suspended masses 10kg each is tripled, the gravitational force of attraction between them is reduced by
A wheel and axle is used to raise a load of 500 N by the application of an effort of 250N. If the radii of the wheel and the axle are 0.4cm and 0.1cm respectively, the efficiency of the machine is
A ray of light which strikes a glass slab from air at normal incidence passes through the slab
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