Due to Earth s rotation celesaa objects Ur the moon and the

Due to Earth s rotation. celesaa] objects U.r the moon and the stars ippcai to move across the sky. nsmg in the cast and strong in the west As a result if a telescope in Earth remans suttotuat hie vsewing a celestial object, the object will slowly move outadr the ssewvg field of the telescope For the teascn. a mota a often attached to telescopes so that the telescope rotates at the same rate as Earth Drtermne hen long it sbculd take die motor to turn the telescope through an angle of mil a a tkrecnon perpendk-tfar to Earth s axis

Solution

Eart rotates 360 deg in 24 hrs and telescope rotatesat same speed as that of earth.

Now to rotate 360 deg ----it takes 24*60*60 seconds

To rotate 1 deg ---- it takes 24*60*60/360 seconds

Therefore, to rotate 7 min( 7/60 deg) ---it takes {24(60*60)/360}*7/60 seconds

----- 28 seconds

It takes 28 seconds for the motor attached to telescope to rotate it through an angle of 7 min.