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
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