Homework Help: physics

Posted by dan on Thursday, May 10, 2012 at 11:54am.

In the 1950s, an experimental train that had a mass of 3.30 104 kg was powered across level track by a jet engine that produced a thrust of 4.90 105 N for a distance of 600 m.
(a) Find the work done on the train.
1 J
(b) Find the change in kinetic energy.
2 J
(c) Find the final kinetic energy of the train if it started from rest.
3 J
(d) Find the final speed of the train if there was no friction.
4 m/s

-how do you find KE?
-whats the "work formula?"
-calculating no friction? isnt that impossible?

physics - Elena, Thursday, May 10, 2012 at 4:51pm
1) Work = force • distance
Work = F2•3s = 4.9•105•600 =2.94•10^8 J.

2) work done = energy gained
Kinetic energy gained = 2.94•10^8 J It had 0 Ke to start, so this is its change in KE
3) This is also the final KE of the train
4) KE = m•v²/2
2.94•10^8 = 0.5•3.3•10^4• v²
V = sqrt (2.94•10^8/0.5•3.3•10^4) = 133.5 m/s

Answer this Question

Related Questions

Physics - In the 1950s, an experimental train that had a mass of 3.30 104 kg was...
physics - In the 1950s, an experimental train that had a mass of 3.30 104 kg was...
Physics - In the 1950s, an experimental train that had a mass of 2.65 104 kg was...
Physics - In the 1950’s, an experimental train that had a mass of 41000 kg ...
AP Physics - 27. a)In the 1950’s, an experimental train that had a mass of ...
Physics - An experimental train has a mass of 1.70e4 kg and is powered across a ...
physics - Part 1 In the 1950’s, an experimental train that had a mass of ...
physics - A toy train track is mounted on a large wheel that is free to turn ...
physics - A railroad car containing explosive material is initially traveling ...
Physics - a track is mounted on a large wheel that is free to turn with ...

For Further Reading

First Name:
School Subject:
Answer: