A bumper car is moving at constant velocity when another bumper car starts to push on it with a constant force at an angle of 60 degrees with respect to the first car's initial velocity. The second bumper car continues pushing in exactly that direction for some time. What is most likely to happen is that
a. the first car will stop moving.
b. the first car will move in the direction of the force.
c. the first car's velocity will increase in magnitude but not change direction.
d. the first car's velocity will gradually change direction more and more toward that of the force while increasing in magnitude.
e. the first car's velocity will gradually change direction more and more toward that of the force while decreasing in magnitude.
[Ques. 2] The figure shows a snapshot of four different waves in identical ropes stretched with the same force.
The waves with the largest amplitude are _________ and _________.
[Ques. 3] A juggler throws two balls up to the same height so that they pass each other halfway up when A is rising and B is descending. Ignore air resistance and buoyant forces. Which statement is true of the two balls at that point?
a. There is an residual upward force from the hand on each ball.
b. There is a greater residual force from the hand on A than there is on B.
c. Only gravity acts on B but there is an additional residual force from the hand on A.
d. There is an additional downwards force besides gravity on each ball.
e. The only force acting on each ball is the gravitational force.
[Ques. 4] The figure shows a snapshot of four different waves in identical ropes stretched with the same force.
The waves with the largest wavelength are waves __________ and ___________.
[Ques. 5] The vector sum of three co-planar forces
a. must be zero.
b. must be perpendicular to one of the three.
c. must be parallel to one of the three.
d. must be perpendicular to the plane.
e. may have any direction in the plane.
[Ques. 6] The apparent weight of a fish in an elevator is greatest when the elevator
a. moves downward at constant velocity.
b. moves upward at constant velocity.
c. accelerates downward.
d. accelerates upward.
e. is not moving.
[Ques. 7] The figure shows a snapshot of four different waves in identical ropes stretched with the same force.
The wave with the largest frequency is
a.
I.
b.
II.
c.
III.
d.
IV.
e.
all of the above.
[Ques. 8] A book is placed on a chair. Then a videocassette is placed on the book. The floor exerts a normal force
a. on all three.
b. only on the book.
c. only on the chair.
d. upwards on the chair and downwards on the book.
e. only on the objects that you have defined to be part of the system.
[Ques. 9] Only two forces act on a 3.0-kg mass. One of the forces is 9.0 N east, and the other is 8.0 N in the direction of 62 north of west. What is the magnitude of the acceleration of the mass?
a. 2.0 m/s2
b. 2.4 m/s2
c. 3.3 m/s2
d. 2.9 m/s2
e. 5.7 m/s2
[Ques. 10] The figure shows a snapshot of four different waves in identical ropes stretched with the same force.
The wave with the largest amplitude is
a.
I.
b.
II.
c.
III.
d.
IV.
e.
all of the above.
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