A 15,000lb freight car is pulled along a horizontal track.

Ifthe car starts from rest and attains a velocity of 40ft/s

aftertraveling a distance of 300ft.

determine the total work done on the car by the towing forcein

this distance if the rolling frictional force between the carand

the track is 80lb.

Question

Engineering

Laci Patrick

9 April, 17:16

A 15,000lb freight car is pulled along a horizontal track.

Ifthe car starts from rest and attains a velocity of 40ft/s

aftertraveling a distance of 300ft.

determine the total work done on the car by the towing forcein

this distance if the rolling frictional force between the carand

the track is 80lb.

+4

Answers (1)

Know the Answer?

Elle Liu · Answer 1

12024000 lb*ft

Explanation:

The total work will be the sum of the energy consumed by friction plus the kinetic energy the car attained.

L = Ek + Lf

Lf = Ff * d

Ek = 1/2 * m * v^2

Therefore:

L = Ff * d + 1/2 * m * v^2

L = 80 * 300 + 1/2 * 15000 * 40^2 = 12024000 lb*ft

THe total work done on the car is of 12024000 lb*ft

A 15,000lb freight car is pulled along a horizontal track.Ifthe car starts from rest and attains a velocity of 40ft/saftertraveling a distance of 300ft.determine the total work done on the car by the towing forceinthis distance if the rolling frictional force between the carandthe track is 80lb.