A 72.7 kg steel box is being pushed along the concrete ground. It goes from zero to a speed of 41.7 m/s in 7.5 s. How hard (in newtons) is the box being pushed? Use the coefficient values found in Table 5.1 from your text (page 133). Table 5.1 Coefficients of Friction (u)MaterialStatic FrictionKinetic FrictionSteel on steel0.580.20Steel on steel (lubricated)0.130.13Glass on glass0.950.40Hardwood on hardwood0.400.25Steel on concrete0.30Aluminum on aluminum1.9Rubber on dry concrete2.01.0Rubber on wet concrete1.50.97Aluminum on wet snow0.40.02Steel on Teflon0.040.04

mass of steel box = 72.7 kg Initial velocity =0 m/s Final velocity = 41.7 m/s time taken = 7.5…

Answered: A 72.7 kg steel box is being pushed…

A 72.7 kg steel box is being pushed along the concrete ground. It goes from zero to a speed of 41.7 m/s in 7.5 s. How hard (in newtons) is the box being pushed?

College Physics

1st Edition

ISBN:9781938168000

Author:Paul Peter Urone, Roger Hinrichs

Publisher:Paul Peter Urone, Roger Hinrichs

Chapter12: Fluid Dynamics And Its Biological And Medical Applications

Section: Chapter Questions

Problem 41PE: A layer of oil 1.50 mm thick is placed between two microscope slides. Researchers find that a force...

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Question

100%

A 72.7 kg steel box is being pushed along the concrete ground. It goes from zero to a speed of 41.7 m/s in 7.5 s. How hard (in newtons) is the box being pushed? Use the coefficient values found in Table 5.1 from your text (page 133).

Table 5.1 Coefficients of Friction (u)
Material
Static Friction
Kinetic Friction
Steel on steel
0.58
0.20
Steel on steel (lubricated)
0.13
0.13
Glass on glass
0.95
0.40
Hardwood on hardwood
0.40
0.25
Steel on concrete
0.30
Aluminum on aluminum
1.9
Rubber on dry concrete
2.0
1.0
Rubber on wet concrete
1.5
0.97
Aluminum on wet snow
0.4
0.02
Steel on Teflon
0.04
0.04

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