is the person’s apparent weight? (Use g = 9.8 m/s2.) A) 900 N B) 760 N C) 620 N D) 960 N Answer: A Var: 35 4) A 80 N force is needed to slide a 50.0 kg box across a flat surface at a constant velocity. What is the coefficient of kinetic friction between the box and the floor? (Use g = 9.8 m/s2.) A) 0.16 B) 0.13 C) 0.15 D) 0.18 Answer: A Var: 50+ 5) A piano mover raises a 100 kg piano at a constant rate using a frictionless pulley system‚ as shown in the figure. With roughly what
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Questions What are the two ways that friction affected the performance of your vehicle? Friction affected my vehicle by either not pushing it far enough‚ or pushing it very far. The friction of the ground would also stop my vehicle from going farther then it could’ve. My car also needed a bit of momentum to start so the friction did not help my care move at all. What problems related to friction did you encounter and how did you solve them? The friction did not help my car move. My car needed
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particle. However‚ the most widely used version is the singleface design. ABOUT ELECTROMAGNETIC CLUTCH These electromagnetic clutches are designed to have a very high torque to size ratio. They include longlife friction materials‚ are corrosion protected and require little or no maintenance after installation. Typical applications include copiers and printers‚ packaging and labelling machinery‚ medical equipment‚ conveyors‚ document feeders and textile machinery
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Chapter 9 Problems 1‚ 2‚ 3 = straightforward‚ intermediate‚ challenging Section 9.1 Linear Momentum and its Conservation 1. A 3.00-kg particle has a velocity of [pic]. (a) Find its x and y components of momentum. (b) Find the magnitude and direction of its momentum. 2. A 0.100-kg ball is thrown straight up into the air with an initial speed of 15.0 m/s. Find the momentum of the ball (a) at its maximum height and (b) halfway up to its maximum height. 3. How fast can you set the Earth
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Journal of Manufacturing Systems Vol. 16/No. 5 1997 A Systems Model and Simulation of the Vibratory Bowl Feeder Gary P. Maul and M. Brian Thomas‚ The Ohio State University‚ Columbus‚ Ohio ture of a vibratory bowl feeder is the maximum speed at which it can convey parts. Though not the first to research vibratory feeders‚ he worked independently of other investigators to develop a basic theory of operation. He defined the essential parameters for bowl analysis and with these defined the
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3.2.1 Study: Therein Lies the Rub Study SheetStudy Sheet Physical Science (S2541215) Claire Hasenoehrl Date: ____________ Use the spaces below to take notes on the key concepts presented in this study. Main idea: Friction is the force that opposes motion when two surfaces rub together. The force that opposes motion when two materials touch each other. causes object to accelerate downward The force between two objects at rest that opposes their sliding relative to each other. The frictional
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Introduction Super-hydrophobic surfaces‚ as well as‚ low adhesion and friction are desirable for various industrial applications. Hydrophobic (water-repellent) surfaces can be constructed either by using low surface energy materials or by chemically treating surfaces with materials such as polytretafluoroethylene‚ silicon‚ or wax. Another technique that can be used to increase the hydrophobic properties of a hydrophobic surface is to increase the surface area by increasing surface roughness. If
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FIRST MID-QUARTER ASSESSMENT IN SCIENCE (8th Grade – Candid Puffin) Name: _____________________ Date: ________________ I. KNOWLEDGE A. Identification. Identify the law/concept that explains each of the given phenomena. Write only the letter of the correct answer on the space provided. A – Law of Inertia B – Law of Acceleration C – Law of Interaction _____ 1. Recoil of a gun when fired _____ 2. Two men find a car harder to push than a tricycle _____ 3. A body moves backward
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kg from the floor to a height of 1.98 m. How much work does he do? W=FΔd=Eg Eg=mgΔh m=254 kg Δh=1.98 m Eg=(254)(9.8)(1.98) Eg=49528.62 J W=49528.62 J A child drags a 20-kg box across a lawn for 10 m and along a sidewalk for 30 m the coefficient of friction is 0.25 for the first part of the trip and 0.55 for the second. If the child always pulls horizontally‚ how much work does the child do on the box? WTotal=F1Δd1+F2Δd2 F1=FN=μmg Δd1=10 m m=20 kg μ=0.25 W1=(0.25)(20)(9.8)(10)
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PHYS 1401 College Physics I Test 2 Page 1 of 6 Houston Community College System PHYS 1401 Test # 2 PHYS 1401 College Physics I Test 2 Page 2 of 6 Name ______________________________________________________ Date ____________ PHYSICS 1401. Test 1 Chapters 3‚ 4 and 5 _____________________________________________________________________________ INSTRUCTIONS: Answer all questions from Section I (2 points per question). And Solve at least four problems from Section II (20 points
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