1.

If earth completes one revolution in 24hours,what is the angular displacement made by earth in one hour.Express your answer in both radian and degree.

Answer»

Earth completes ONE revolution in 24 hours .
it MEANS, angular displacement in 24 hours = 360°
so, angular displacement in 1 hour = 360/24 = 15° .
hence, angular displacement MADE by earth in one hour = 15°
we know, relation between RADIAN and degree,
360° = 2π radian
1° = 2π/360 radian = π/180°
15° = 15π/180 = π/12 radian.

angular displacement made by earth in one hour = π/12 radian.



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