Physics 213 Quiz # 2 5
points each Wednesday
9-13-2006
1. Define average velocity using a formula
2. Define average accleration using a
formula.
3. Draw A + B and A -B for each pair of vectors in problems 7 &
8.
Remember, the vectors on this page are
real vectors, meaning you can redraw them elsewhere, but you cannot change
their direction or magnitude.
Make certain you make it absolutely clear to me what you mean by A + B
and A - B .
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4.
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5.
Use the position vs time graph above to calculate the average velocity of the object from
t = 0 s to t = 5 s.
6.
A train car moves along a long straight track. The graph below shows a
position vs. clock reading of the motion of this train.
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The graph shows that the train: a.
speeds up all the time b.
slows down all the time c.
speeds up part of the time and slows down part of the time d.
moves at constant velocity |
7.
Fred drops a ball from the top of a flag pole. Henrietta measures the time it takes the ball to reach the
ground to be 10 seconds. How tall
is the flag pole?
8.
A jet plane lands with a speed of 100 m/s and can accelerate at maximum
rate of - 5 m/s2 as it comes to rest.
From the instant it touches the runway
what is the minimum time interval needed
to bring it to rest and what length of runway does it take?
Martha is riding in a hot air balloon,
rising at a constant 5 m/s. George watches nervously from the ground. At 30 m
according to her altimeter, she releases a bouquet of flowers for George to
catch.
9.
Draw a sketch of this situation.
10. Draw a motion diagram for the bouquet
starting the instant Martha releases it.
5 points bonus!
How long does it take
the bouquet to reach the ground?
(Use 10 m/s2 for the acceleration
due to gravity.)