Consider the freight train in the figure. Suppose that 15 boxcars pass by in a time of 11.0 s and each has a length of 13.0 m.
Hz
(b) What is the speed of the train?
m/s
Homework Answers
the frequency at which each boxcar passes is 15 / 11 = 1.36 boxcars
per sec.
speed = distance travelled / time = 15 *13/11 = 17.73 m/s
a)
frequency=number of boxcars passes/time taken to pass these boxcars
=15/11
=1.3636 Hz
b)
speed=distance travelled/time taken
here,
distance travelled is =number of boxes*length of each box
=15*13
= 195 m
now,
speed=195/11
=17.7272 m/sec
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