# Mastering In Physics

Thank you

Don't use plagiarized sources. Get Your Custom Essay on
Mastering In Physics
From $10/Page MASTERING IN PHYSICS Ch-07 Question-1. A box of mass m is sliding along a horizontal surface. Part A The box leaves position x=0 with speed v0. The box is slowed by a constant frictional force until it comes to rest at position x=x1. Find the magnitude of the average frictional force that acts on the box. (Since you don’t know the coefficient of friction, don’t include it in your answer.)Express the frictional force in terms of m, v0, x1 Part B After the box comes to rest at position x1, a person starts pushing the box, giving it a speed v1. When the box reaches position x2(wherex2 > x1), how much work has the person done on the box? Assume that the box reaches x2 after the person has accelerated it from rest to speedv1.Express the work in terms of m, v0, x1, x2, v1 Question-2 Understand that conservative forces can be removed from the work integral by incorporating them into a new form of energy called potential energy that must be added to the kinetic energy to get the total mechanical energy. The first part of this problem contains short-answer questions that review the work-energy theorem. In the second part we introduce the concept of potential energy. But for now, please answer in terms of the work-energy theorem.(PART-A to PART E) Work-Energy Theorem The work-energy theorem state Question-3. Part A Consider a uniform gravitational field (a fair approximation near the surface of a planet). Find U(yf)−U(y0)=−∫yfy0F⃗ g⋅ds⃗ , where F⃗ g=−mgj^ and ds⃗ =dyj^. Express your answer in terms of m, g, y0, and yf. U(yf)−U(y0) = SubmitHintsMy AnswersGive UpReview Part Part B Consider the force exerted by a spring that obeys Hooke’s law. Find U(xf)−U(x0)=−∫xfx0F⃗ s⋅ds⃗ , where F⃗ s=−kxi^,ds⃗ =dxi^, and the spring constant k is positive. Express your answer in terms of k, x0, and xf. U(xf)−U(x0) = SubmitHintsMy AnswersGive UpReview Part Part C Finally, consider the gravitational force generated by a spherically symmetrical massive object. The magnitude and direction of such a force are given by Newton’s law of gravity: F⃗ G=−Gm1m2r2r^, where ds⃗ =drr^; G, m1, and m2 are constants; and r>0. Find U(rf)−U(r0)=−∫rfr0F⃗ G⋅ds⃗ . Express your answer in terms of G, m1, m2, r0, and rf. U(rf)−U(r0) = SubmitHintsMy AnswersGive UpReview Part Question 4. Suppose our experimenter repeats his experiment on a planet more massive than Earth, where the acceleration due to gravity is g=30 m/s2. When he releases the ball from chin height without giving it a push, how will the ball’s behavior differ from its behavior on Earth? Ignore friction and air resistance. (Select all that apply.) Question 5. While a roofer is working on a roof that slants at 41.0 ∘ above the horizontal, he accidentally nudges his 95.0 N tool box, causing it to start sliding downward, starting from rest. Part A If it starts 5.00 m from the lower edge of the roof, how fast will the toolbox be moving just as it reaches the edge of the roof if the kinetic friction force on it is 21.0 N? Question 6. A force parallel to the x-axis acts on a particle moving along the x-axis. This force produces a potential energy U(x) given by U(x)=α x4where α=1.16 J/m4 . Part A What is the force when the particle is at position x = -0.660 m ? Question 7 As you are trying to move a heavy box of mass m, you realize that it is too heavy for you to lift by yourself. There is no one around to help, so you attach an ideal pulley to the box and a massless rope to the ceiling, which you wrap around the pulley. You pull up on the rope to lift the box. (Figure 1) Use g for the magnitude of the acceleration due to gravity and neglect friction forces. Part A Once you have pulled hard enough to start the box moving upward, what is the magnitude F of the upward force you must apply to the rope to start raising the box with constant velocity? Express the magnitude of the force in terms of m, the mass of the box. Part BConsider lifting a box of mass mto a height husing two different methods: lifting the box directly or liftingthe box using a pulley (as in the previous part). What is {W_{\rm d}}/{W_{\rm p}}, the ratio of the work done lifting the box directly to the work done lifting the box with a pulley? Express the ratio numerically. Question 8 To be able to interpret potential energy diagrams and predict the corresponding motion of a particle. Potential energy diagrams for a particle are useful in predicting the motion of that particle. These diagrams allow one to determine the direction of the force acting on the particle at any point, the points of stable and unstable equilibrium, the particle’s kinetic energy, etc. Consider the potential energy diagram shown. (Figure 1) The curve represents the value of potential energy U as a function of the particle’s coordinate x. The horizontal line above the curve represents the constant value of the total energy of the particle E. The total energy E is the sum of kinetic ( K) and …. part A The force acting on the particle at point A is __________. part B The force acting on the particle at point Cis __________. par C The force acting on the particle at point Bis __________. part D The acceleration of the particle at point Bis __________. part E If the particle is located slightly to theleft of point B, its acceleration is __________. part F If the particle is located slightly to theright of point B, its acceleration is __________. part G Name all labeled points on the graphcorresponding to unstable equilibrium. List your choices alphabetically,with no commas or spaces; for instance, if you choose points B, D,and E, type your answer as BDE. part H Name all labeled points on the graphcorresponding to stable equilibrium. List your choices alphabetically,with no commas or spaces; for instance, if you choose points B, D,and E, type your answer as BDE part I Name all labeled points on the graph wherethe acceleration of the particle is zero. List your choices alphabetically,with no commas or spaces; for instance, if you choose points B, D,and E, type your answer as BDE part J Name all labeled points such that when aparticle is released from rest there, it would accelerate to theleft. List your choices alphabetically,with no commas or spaces; for instance, if you choose points B, D,and E, type your answer as BDE. part K Consider points A, E, and G. Of these threepoints, which one corresponds to the greatest magnitude ofacceleration of the particle? part L What point on the graph corresponds to themaximum kinetic energy of the moving particle? part M At what point on the graph does the particlehave the lowest speed? Question 9 A roller coaster car may be approximated by a block of mass (m) . The car, which starts from rest, is released at a height (h) above the ground and slides along a frictionless track. The car encounters a loop of radius (R), as shown. Assume that the initial height (h) is great enough so that the car never loses contact with the track. Find an expression for the kinetic energy of the car at the top of the loop. Express the kinetic energy in terms of m,g,h and R Find the minimum initial height (h) at which the car can be released that still allows the car to stay in contact with the track at the top of the loop. Express the minimum height in terms of R Question 10 If a fish is attached to a vertical spring and slowly lowered to its equilibrium position, it is found to stretch the spring by an amount d. If the same fish is attached to the end of the unstretched spring and then allowed to fall from rest, through what maximum distance does it stretch the spring? (Hint: Calculate the force constant of the spring in terms of the distance d and the mass m of the fish.) Express your answer in terms of d.To continue with the answer check on mycoursewriter.com/ Order NOW For A 35% Discount! Pages (550 words) Approximate price: - Why Choose Us Quality Homework Writing Do you need to ace your test? We have qualified writers to assist you in writing 100% quality homework writing. Mycoursewriter offers students unique and personalized custom papers that help them in getting good grades. Our academic experts will assist you with your dissertation papers, thesis writing, research papers, term papers, and case study homework help. Our writers are experienced and have perfected the art of crafting the best essay writing papers regardless of your academic level. Order now and get our superb homework writing services. Expert Academic Writers A student needs professional assistance outside class time. Before hiring our writers, they undergo thorough tests and strict educational backgrounds. After passing a test, our writers undergo training to ensure they deliver expert professional papers to our customers. We ensure they meet the timely delivery of papers and follow our customers' provided instructions. Every writer is an ENL writer and is from the USA, Canada, UK, or Australia. Our experts approach papers effectively depending on their area of specialization. Affordable Price Guarantees Is the deal too good to be true? Mycoursewriter is the most affordable assignment help website on the market. We consider students' daily needs for academic help. Our paper costs are reasonably priced to approximately 90% of students around the globe. Our main aim is to ensure students achieve academic excellence, and we believe inconsiderable prices should not hinder students from getting quality homework writing help. In case of any dissatisfaction, we offer unlimited revisions and rewrites without extra charges. Timely delivery of papers Tight deadline? Is your paper due in the next few hours? Worry no more. Our writers are here for your rescue. Many college students find it hard to balance their social and academic life and get caught up with academic deadlines. Drafting your paper at the last minute does not allow you to conduct extensive research and craft the correct answers. We have expert writers ready to work on your assignment writing. Urgent writing services are the ultimate solutions you need. We guarantee you timely delivery of papers at your convenience and specified time delivery of the customer. 100% Original Tasks The ultimate deal-breaker in achieving good grades is submitting imitative papers. Plagiarism is a breach of examination standards and has serious consequences. Students need to deliver papers written in their understanding by paraphrasing their research findings and relevant citations. Our expert's primary consideration is providing free plagiarized papers that meet the lecturers' requirements. Our editors will proofread your paper before delivery ad ensure your papers will not be substandard. We guarantee extreme originality, and in case of any customer concerns, we offer a plagiarism report. All Round the clock Customer Support Our website is user-friendly and super useful! Mycoursewriter is the most trusted online writing website always available to provide you with assignment writing services that you need. Our primary concern is meeting customer need specifications by our friendly customer support team that Is available all the time. Our website usability is self-learnable but in case of any problem, feel free to contact us directly through our website email: support@mycourserwiter.com. We have diligently satisfied thousands of students, and you can witness this on our sites' review page. Try it now! ## Calculate the price of your order We'll send you the first draft for approval by at Total price:$0.00

How it works?

Fill in the order form and provide all details of your assignment.

Proceed with the payment

Choose the payment system that suits you most.

Advantages of Using Our Assignment writing Services

Mycoursewriter welcomes you for superb essay writing services. We are a legit site offering help with your most challenging homework writing assignments at affordable prices. Your essay paper will be assigned to a professional writer who will craft the paper from scratch according to your provided instructions.

## Essay Writing and Proofreading Services

Essay writing is a common assignment writing for most college students. It takes a lot of time to craft a complete perfect essay. Mycourserwiter offers the best essay writing and proofreading services for most college students. Your paper is assigned to an expert writer who does thorough research on fresh ideas and personalizes your essay paper according to your assignment writing guidelines. Our essays are entirely exceptional and undergo a strict procedure that includes papers free from plagiarism and thorough proofreading.