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PoP5 Ex5.7mod
At what speed will a car negotiate a turn of radius r that is banked at an angle θ above horizontal even when the road is so icy that the force of static friction is zero?
Walker4e Example 6-9 car on banked road
A.
B.
C.
D.
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Walker4e
Two children ride on a merry-go-round, with child 1 at a greater distance from the axis of rotation than child 2. The angular speed of child 1 is _____ the angular speed of child 2. Walker4e CC 10-1
A. greater than
B. less than
C. the same as
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PoP5 10.11b
A disk 8.00 cm in radius rotates at a constant rate of 1200 rev/min about its central axis. What is the linear speed of a point 3.00 cm from its center?
A. 60 cm/s
B. 3.77 m/s
C. 10.5 m/s
D. 23.2 m/s
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PoP5 10.8
A centrifuge rotates at an angular speed of 3600 rev/min. When switched off, it rotates through 50.0 revolutions before coming to rest. Find the constant angular acceleration α of the centrifuge.
A. −7.54 rad/s2
B. −1420 rad/s2
C. −377 rad/s2
D. −226 rad/s2
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PoP5 OQ 10.08
Four particles are joined by light, rigid rods as shown. Assume a = b and M is larger than m. About which of the coordinate axes does the depicted system have the smallest and largest moment of inertia? Serway PoP5 Figure 10.OQ8
A. Ix is smallest, Iy is largest.
B. Ix is smallest, Iz is largest.
C. Iz is smallest, Ix is largest.
D. Iy is smallest, Iz is largest.
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klm
What is the moment of inertia of System 2 as shown? Walker 4e Conceptual Checkpoint 10-2 p.315
A. ½mR2
B. mR2
C. 2mR2
D. 4mR2
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sb5 10.30
What is the moment of inertia of a solid sphere about an axis tangent to its surface?
A. 2MR2/5
B. 3MR2/5
C. MR2
D. 7MR2/5
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answer

Walker4e Example 6-9 car on banked road
B.
solution equation



















answer

C. the same as


Because the merry-go-round rotates as a single solid object, the angular speed of every point on its surface is exactly the same. The linear speed of child 1, however, is greater than the linear speed of child 2.



















answer

B. 3.77 m/s




















answer

D. −226 rad/s2




















answer

Serway PoP5 Figure 10.OQ8
B. Ix is smallest, Iz is largest.

When the axis of rotation passes through a particle, that particle's r is zero and it does not contribute to the moment of inertia. Therefore, Iz is largest because all four masses contribute, and Ix is smallest because only the smaller masses m contribute. In fact, Ix = 2ma², Iy = 2Ma², and Iz = 2(m+M)a².



















answer


D. 4mR2
solution equation



















answer

D. 7MR2/5
solution equation







































 
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