1) In figure 10-25, the ice-skater changes her angular velocity when she spins b
ID: 2099409 • Letter: 1
Question
1) In figure 10-25, the ice-skater changes her angular velocity when she spins by starting the spin with her arms stretched out and then drawing her arms in. By drawing her arms in, she is changing her...torque.
moment of inertia.
angular momentum.
linear momentum.
None of the above.
2) In the above question about the ice-skater, which of the following does NOT change when she draws in her arms?
Her angular velocity.
Her angular acceleration.
Her moment of inertia.
Her angular momentum.
None of the above.
3) The change in linear momentum with time is equal to the net force applied to an object. The change in angular momentum with time is equal to...
the net torque applied to the object.
the net force applied to the object.
the angular kinetic energy of the object.
the linear kinetic energy of the object.
4) The direction of the angular momentum vector of an object about a particular point is
perpendicular to a line connecting the object to the point..
parallel to a line connecting the object to the point.
perpendicular to the linear velocity of the object.
parallel to its linear velocity.
(a) and (c)
(b) and (c)
(a) and (d)
5) You look down on a old spin record album and is that is it turning in the clockwise direction. The direction of the angular momentum vector for the album is
clockwise
counterclockwise
up
down
right
left
6) In Example 10-4, the author suggests we CHECK our answer by noting that
if I2 <<< I1, then ?f ? ?i.
if I2 >>> I1, then ?f ? ?i.
both (a) and (b)
neither (a) or (b)
7) In Example 10-6, the angular momentum of the running child about the center of the merry-go-round before she jumps on to it and starts rotating is
I?1
mgvgR
mgR2?2
Rmvi
zero
8) An object is moving in a straight line with constant linear velocity. The magnitude of its angular momentum about a point not on its axis of travel is...
constant.
always zero.
increasing.
decreasing.
may be increasing, may be decreasing.
9) In Example 10-8, the net torque on the particle is equal to
zero
mv.
mv2/r
mvr
dF/dt
10) The cross product of two vectors is
constant.
zero.
a scalar.
a vector.
Explanation / Answer
1) Moment of inertia
2) Angular momentum
3)The net torque applied to the object.
4) a) and c)
5)down
7)Rmvi
8)may be increasing, may be decreasing.
10) A vector
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