Two persons manage to push a motorcar of mass 1200 kg at a uniform velocity along a level road. The same motorcar can be pushed by three persons to produce an acceleration of 0.2 m s². With what force does each person push the motorcar? (Assume that all persons push the motorcar with the same muscular effort.)
From the top of a building 50 m high the angles of depression of the top of the bottom of a tower observed to be 30 degrees and 60 degrees find the height of the tower and distance between the building and the tower take √3 is equals to 1.73
How many cubic centimetres of iron are there in an open box whose external dimension and 36 cm, 25 cm and 16.5 cm,the iron and being 1.5 cm thick throughout? If 1 cm cube of iron weight 15 gram find the weight of the empty box in kilograms
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