Unformatted text preview: 4 rad/s and its moment of inertia is 125 kg∙m2. A 40.0-kg person
climbs onto the carousel near its outer edge. What is the angular speed of the carousel after
the person climbs aboard?
[A] 1.41 rad/s [B] 1.57 rad/s Angular momentum is conserved, so [C] 1.83 rad/s [D] 2.26 rad/s with and Then (f) [4pt] A plane flies at a velocity of 70 m/s relative to the
ground, in a direction 35o east of north. The wind blows toward
the north at 50 m/s. What is the plane’s air speed (relative to
the wind)? [A] 20 m/s [B] 41 m/s The desired speed is the magnitude
Then [C] 99 m/s plane wind
35o [D] 120 m/s in the figure. Addition of velocities gives with
You may recognize this as the Law of Cosines for
the triangle formed by the three vectors. Then 10 (g) [4pt] A block with mass is being pushed
by a constant force that makes an angle of
with the horizontal as shown. The block is
moving with constant velocity on a level
surface. The coefficient of kinetic friction
between the block and the surface is .
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This document was uploaded on 03/09/2014 for the course PHYS 221 at Ohio Northern University.
- Fall '12