Q.1
A body with a definite shape that doesn't change is:
  • period
  • angular acceleration
  • rigid body
  • radius of gyration
Q.2
A dancer on ice spins faster when she folds here arms. This is due to
  • Increases in energy and increase in angular momentum
  • Decrease in friction at the skates
  • Constant angular momentum and increase in kinetic energy
  • Increase in energy an decreases in angular momentum
Q.3
Two circular discs A and B have equal masses and uniform thickness but have densities ρ1 and ρ2 such that ρ1 >ρtheir moment of inertia is
  • I1 > I2
  • I1 >> I2
  • I1 < I2
  • I1 = I2
Q.4
Centripetal acceleration is directed
  • directed away from the center of the circle
  • directed towards the center of the circle
  • it is perpendicular to the radius at that point
  • It has no direction
Q.5
The relation between linear velocity and angular velocity
  • r = v⍵
  • ⍵ = vr
  • v = r⍵
  • a = v⍵
Q.6
A Ferris wheel starts at rest and builds up to a final angular speed of 0.rad/s while rotating through an angular displacement of 4.9 rad. What is its average angular acceleration?
  • 0.01 rad/s/s
  • 0.05 rad/s/s
  • 1.8 rad/s/s
  • 2.6 rad/s/s
Q.7
What is the angular speed about the rotational axis of the Earth for a person standing on the surface?
  • 7.3 x 10-5 rad/s
  • 3.6 x 10-5 rad/s
  • 6.28 x 10-5 rad/s
  • 3.14 x 10-5 rad/s
Q.8
A 0.12-m-radius grinding wheel takes 5.5 s to speed up from 2.0 rad/s to 11.0 rad/s. What is the wheel's average angular acceleration?
  • 9.6 rad/s/s
  • 4.8 rad/s/s
  • 3.1 rad/s/s
  • 1.6 rad/s/s
Q.9
Which of the following is the unit for centripetal force?
  • J
  • m/s2
  • kg⋅m/s
  • N
Q.10
Centripetal acceleration is ...
  • Acceleration toward the center of a curved or circular path
  • Acceleration toward the outside of a circle
  • Vertical motion instead of horizontal motion
  • All of above
0 h : 0 m : 1 s