Two spheres of the same material but of radius 0.01 m and 0.02 m are dropped in the same viscous fluid. Their relative velocities will be respectively
1:1
1: 2
1:4
4 : 1
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Greenhouse gases keep our planet livable by holding onto some of Earth's heat energy so that it doesn't all escape into space. This heat trapping is known as the greenhouse effect. Just as too little greenhouse gas makes Earth too cold, too much greenhouse gas makes Earth too warm
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