OUR CHANGING EARTH

Our Planet Earth

Introduction|Identifying A change|Changes In Our Body|Think And Discuss|Let Us Observe|Undesirable Changes|Exercise Question|OMR

Assertion : If radius of earth suddenly shrinks to half its present without changing its mass value, then the period of an earth's satellite will not change Reason : Time period of a satellite does not upon the mass of earth.

STATEMENT-1 : When tall builidings are constructed on earth, the duration of day and night change. STATEMENT-2 : If our earth shrinks to half of the present radius then the time period will become 12 hrs. STATEMENT-3 : When a rotating disc is placed on a rough horizontal surface its angular momentum is conserved about the centre of disc.