Homework Help: physics

Posted by ally on Friday, February 25, 2011 at 8:18pm.

Part 1
In the 1950’s, an experimental train that had a mass of 32800 kg was powered across a level track by a jet engine that produced a thrust of 4.37 × 10^5N for a distance of 465 m.
Find the work done on the train.
Answer in units of J.

Part 2
Find the change in kinetic energy.
Answer in units of J.

Part 3
Find the ﬁnal kinetic energy of the train if it
started from rest.
Answer in units of J.

Part 4
Find the ﬁnal speed of the train assuming no
friction.
Answer in units of m/s.

physics - drwls, Friday, February 25, 2011 at 8:32pm
A) Start with the definition of Work.
Force x Distance

B) Work = change in KE. This assumes negligible friction. They should have told you a value to assume for friction, or to neglect it.

C) Same as B

D) Use KE definition to get V. The "no friction assumption" had to be made already, in B. This problem was not well thought out by the instructor

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