circular motion

1. Calculate the angular speed of earth about its own axis

• 3.14/43200 rad/s
• 22/43200 rad/s
• 11/43200 rad/s
• none of these

2. An aircraft executes a horizontal loop of radius 500m with a steady speed of 600km/h , compare its centripetal acceleration with the acceleration due to gravity.

• 1.5
• 2.6
• 5.6
• 9.6

3. if w=t ^2 +1 , Find angular acceleration in 0-2 sec

• 1 rad/s 2
• 2 rad/s 2
• 3 rad/s 2
• 4 rad/s 2

4. Relation between linear speed and angular speed is

• v=wt
• v=wr
• v=d/t
• w=d/t

5. A scooter is going round a circular road of radius 100m at a speed of 10m/s , The angular speed of the scooter will be

• 0.01 rad/s
• 0.001 rad/s
• 0.1 rad/s
• 10 rad/s

6.The length of second hand of watch is 10mm , what is the change in angular speed of watch after 15 seconds

• zero
• 3.14/60 rad/s
• 3.14/90 rad/s
• 3.14/ 100 rad/s

7. If v=4t and r=2m , Find centripetal acceleration, tangential acceleration and net acceleration at t=1 sec

• a c =8m/s 2 a t =4m/s 2 a net =√80m/s 2
• a c =4m/s 2 a t =6m/s 2 a net =√40m/s 2
• ac =9m/s 2 at =14m/s 2 anet =√80m/s 2
• ac =18m/s 2 at =24m/s 2 anet =√80m/s 2

8. The Time rate of change of angular velocity is called

• angular displacement
• angular velocity
• angular acceleration
• all of these

9. Centrifugal force acts radially outward

• True
• False

10. What provide the centripetal force to a car taking a turn on a level road

• centrifugal force
• centripetal acc.
• Force of friction
• none of these