| 21. |
| What is the resultant of the two
vectors to the right? Answer
A. 15.0 N 17.5o counterclockwise
from purple vector.
B. 28.7 N 13.9o
Clockwise from Red Vector
C. 24.1 N 28.4o counterclockwise
from purple vector.
D. 30.0 N 17.5o clockwise from
the red vector.
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| 22. |
| Two students represented
by the diagram to the right collide and grab hold of each other to
avoid falling. The surface becomes frictionless after the
collision. What is their velocity after the collision.
Answer
A. 1170 kg m/s at 22.2o below the
light purple line
B. 1170 kg m/s at 22.2o above the
light purple line
C. 1120 kg m/s at 14.2o above the
light purple line
D. 1120 kg m/s at 14.2o below the
light purple line
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| 23. |
| How fast must the 1.50 x 10 3
kg car to the left be moving on the track which has a radius of 2.00
km for no friction being necessary to keep it on the track.
Answer
A. 3.72 m/s
B. 13.9 m/s
C. 118 m/s
D. 177 m/s |
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| 24. |
| What is the acceleration of the 20.0
kg mass?
A. 2.37 m/s2
B. 3.27 m/s2
C. 4.90 m/s2
D. 9.80 m/s2
Answer |
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| 25. |
| What is the tension on the rope
between the 10.0 kg and 15.0 kg masses? (Assume no
Friction) Answer
A. 49.0 N
B. 98.0 N
C. 120. N
D. 147 N |
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| 26. |
| The 15.0 kg block to the right is
sliding down the inclined plane at a constant velocity. What
is the kinetic coefficient of friction?
A. 0.0282
B. 0.423
C. 0.466
D. 0.906
Answer |
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| 27. |
The coefficient of friction of a box on a level table is 0.054. If a
10.0 kg box is moving to the right at
30.0 m/s, how far does the box slide before it stops? Answer
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A. |
45.9 m |
C. |
456 m |
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B. |
91.8 m |
D. |
851 m |
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| 28. |
A 5.00 kg ball is
dropped from the top of the Systel Building in downtown
Fayetteville. How long does it take the ball to hit the sidewalk if the
building is 45.0 m tall? Answer
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A. |
2.14 seconds |
C. |
4.29 seconds |
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B. |
3.03 seconds |
D. |
9.18 seconds |
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| 29. |
| An airplane has a velocity compared to
air of 850. km/h at 90.0o. The air has a velocity
compared to ground of 120. km/h at 300.o. What is
the airplane's velocity compared to the ground. Answer
A. 730 km/h at 90o
B. 642 km/h at 60o
C. 753 km/h at 82.1o
D. 870 km/h at 90o |
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| 30. |
| How far from the base of the cliff
does the cannon ball shot from the top of the cliff travel before it
hits the ground. The cannon ball leaves the cannon 100.0 m
above the ground. It has a velocity of 150. m/s at an
inclination of 15.0o. Answer
A. 296 m
B. 306 m
C. 1450 m
D. 1496 m |
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