5.A freight train consists of two 7.00 x 105 kg engines and 49 cars withaverage masses of 5.00 x 105 kg.(a) What force (in N) must each engine exert backward on the track toaccelerate the train at a rate of 8.00 x 10-2 m/s2 if the force of friction is7.50 x 105 N, assuming the engines exert identical forces? This is not alarge frictional force for such a massive system. Rolling friction for trainsis small, and consequently trains are very energy-efficient transportationsystems. (Enter the magnitude.)N(b) What is the magnitude of the force (in N) in the coupling between the37th and 38th cars (this is the force each exerts on the other), assumingall cars have the same mass and that friction is evenly distributed amongall of the cars and engines? (Assume both engines are at the front of thetrain.)NAdditional MaterialsO Reading6.Consider the 70.0 kg mountain climber in the figure.31°Fegs15(a) Find the tension in the rope (in N) and the force that the mountainclimber must exert with her feet (in N) on the vertical rock face toremain stationary. Assume that the force is exerted parallel to her legs.Also, assume negligible force exerted by her arms.tension in ropeforce on feetN(b) What is the minimum coefficient of friction between her shoes and thecliff?

Answered: Image /qna-images/answer/9c292e86-46b4-48bc-ac2e-4cd2f3a54a46.jpg

A freight train consists of two 7.00 x 10° kg engines and 49 cars with average masses of 5.00 x 105 kg. (a) What force (in N) must each engine exert backward on the track to accelerate the train at a rate of 8.00 x 10-2 m/s2 if the force of friction is 7.50 x 105 N, assuming the engines exert identical forces? This is not a large frictional force for such a massive system. Rolling friction for trains is small, and consequently trains are very energy-efficient transportation systems. (Enter the magnitude.) N

A freight train consists of two 7.00 x 10° kg engines and 49 cars with average masses of 5.00 x 105 kg. (a) What force (in N) must each engine exert backward on the track to accelerate the train at a rate of 8.00 x 10-2 m/s2 if the force of friction is 7.50 x 105 N, assuming the engines exert identical forces? This is not a large frictional force for such a massive system. Rolling friction for trains is small, and consequently trains are very energy-efficient transportation systems. (Enter the magnitude.) N

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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Concept explainers

Newton’s Third Law of Motion

The horse pulls the cart and the cart pulls the horse in response as per Newton third law. So the big question is, “Don’t the two forces cancel each other? How does the cart accelerate?”

Question

5.
A freight train consists of two 7.00 x 105 kg engines and 49 cars with
average masses of 5.00 x 105 kg.
(a) What force (in N) must each engine exert backward on the track to
accelerate the train at a rate of 8.00 x 10-2 m/s2 if the force of friction is
7.50 x 105 N, assuming the engines exert identical forces? This is not a
large frictional force for such a massive system. Rolling friction for trains
is small, and consequently trains are very energy-efficient transportation
systems. (Enter the magnitude.)
N
(b) What is the magnitude of the force (in N) in the coupling between the
37th and 38th cars (this is the force each exerts on the other), assuming
all cars have the same mass and that friction is evenly distributed among
all of the cars and engines? (Assume both engines are at the front of the
train.)
N
Additional Materials
O Reading
6.
Consider the 70.0 kg mountain climber in the figure.
31°
Fegs
15
(a) Find the tension in the rope (in N) and the force that the mountain
climber must exert with her feet (in N) on the vertical rock face to
remain stationary. Assume that the force is exerted parallel to her legs.
Also, assume negligible force exerted by her arms.
tension in rope
force on feet
N
(b) What is the minimum coefficient of friction between her shoes and the
cliff?

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