Learning Goal: To learn to use images of an object in motion to determine velocity and acceleration.
Two toy rockets are traveling in the same direction (taken to be the x axis). A diagram is shown of a time-exposure image where a stroboscope has illuminated the rockets at the uniform time intervals indicated.
http://session.masteringphysics.com/problemAsset/1…
1) At what time(s) do the rockets have the same velocity?
at time t = 1 only
at time t = 4 only
at times t = 1 and t = 4
at some instant in time between t = 1 and t = 4
at no time shown in the figure
2) At what time(s) do the two rockets have the same acceleration?
at time t = 1 only
at time t = 4 only
at times t = 1 and t = 4
at some instant in time between t = 1 and t = 4
at no time shown in the figure
3) The motion of the rocket labeled A is an example of motion with uniform (i.e., constant) __.
and nonzero acceleration
velocity
displacement
time
4) The motion of the rocket labeled B is an example of motion with uniform (i.e., constant) __.
and nonzero acceleration
velocity
displacement
time
5) At what time(s) is rocket A ahead of rocket B?
before t = 1 only
after t = 4 only
before t = 1 and after t = 4
between t = 1 and t = 4
at no time(s) shown in the figure
2 Answers
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(1) At t = 1 and t = 4
(2) Never
(3) Uniform acceleration
(4) Velocity
(5) Before t = 1, after t = 4
Source(s): Not too shabby at these problems. -
1)at times t = 1 and t = 4
2)at no time shown in the figure
3)and nonzero acceleration
4)velocity
5)before t = 1 and after t = 4