Quiz 28-Version W showing a 1.02-kg box resting on a flat plane. A hor- the plan
ID: 1731795 • Letter: Q
Question
Quiz 28-Version W showing a 1.02-kg box resting on a flat plane. A hor- the plane, ,, 0.6 and .-04. C. aeaning leaves a layer of adsorbed active molecules; the vacuam remaoves the oxides ions 1 though 7 refer to the following figure, string is attached to the box. For the box on D. Cleaning resoves asperities; the vacuan in creases diffusicn and creep. 102 kg D. 1. To the nearest newton, what is the magnitude of the gravitational force on the box 2. What is the magnitude of the mormal force F that the surface exerts on the box? 3. What is the magnitude of the force that the box exerts on the surface? 4. If there is no tension in the string (Fr ON) what is the magnitude of the frictional force on the box? 5. Suppose Fr 2N. What is the magnitude of 6. Suppose the horizostal tension is increased un 7. After the box begins sliding, what Fr will keep the frictional force? til the box is about to start sliding. What is Fr? it sliding at a constant speed of 0.8 m/st 8. What is the term for the removal of material from a surface by mechanical action? A. Thread rolling B. Friction 11. Why is t fos most materials? TA. SEding surfaces allow less time for atom- D. Shot peening E. Nitriding to-atom bonding at asperity junctions than B. Sliding surfaces create less adhesive wear of C. Sliding surfaces create less abrasive wear than D. Sliding surfaces have a greater contact area stationary surface asperity junctions than stationary surfaces. stationary surfaces. than stationary surfaces 9. In the context of the current chapter, what is an asperity? A. Harsh precipitate B. Acidic D. Dendrite E. Vacancy 12. Which of the following is not a surface treat- ment to increase hardness or reduce friction? 10. Why do clean metal surfaces under a vacuum . Boriding tend to have high friction coefficients ( > 5)? A. Cleaning flattens asperities; the vacuum in- B. Nitriding C. Carburizing creases the normal force at the junction. B. Cleaning removes the surface oxide film; the. Annealing prevents the cxide from re-forming. E. Ceramic deposition by a plasmaExplanation / Answer
10.clening removes the surface oxide film so adhesion force is strong so tangential stress deform the surface so friction increases.
vacuum prevents from this oxide layer to be re-form.
so ootiin B is correct
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.