gaitons
Set 4, Due Tue, Feb 26, 2008 at 23:59
1.
1
. [1 point, 10 tries]
A 55.0 g tennis ball with an initial speed of 27.4 m/s hits a wall and rebounds with the same speed. The
figure below shows the force of the wall on the ball during the collision. What is the value of
F
max
, the
maximum value of the contact force during the collision, if the force is applied for t
i
=16.8 ms?
Answer:
2.69e+02 N
2.
2
. [1 point, 10 tries]
Far in space, where gravity is negligble, a 464.0 kg rocket travelling at 93.5 m/s fires its engines. The
thrust force is shown as a function of time below. The mass lost by the rocket during the t
i
=30.0 s is
negligible. What impulse does the engine impart to the rocket if the maximum thrust force is 1422.0 N?
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Answer:
2.13e+04 N*s
3.
3
. [1 point, 10 tries]
At what time does the rocket reach its maximum speed?
Answer:
3.00e+01 s
4.
4
. [1 point, 10 tries]
What is the maximum speed of the rocket?
Answer:
1.39e+02 m/s
5.
5
. [1 point, 10 tries]
A 114.0 g ball is dropped from a height of 2.03 m, bounces on a hard floor, and rebounds to a height of
1.86 m. The impulse received from the floor is shown below. What maximum force does the floor exert
on the ball if it is exerted for 6.00 ms?
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 Winter '08
 HUGHES
 mechanics, Force, m/s, Spacecraft propulsion, Multistage rocket, tries

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