À Force of 10 N is applied for 5 m to a 10 kg box at an angle of 40 degrees with respect to the displacement. J. Submit Answer Tries 0/2 What is the sign of the work done by gravity for an elevator in Free fall? Positive Negative Zero insufficient information Submit Answer Tries 0/2 In the example below, provide the Sign of the Net work An Elevator moving upward with decreasing speed has O Negative O Positive net work being done to it. Zero insufficient information

À Force of 10 N is applied for 5 m to a 10 kg box at an angle of 40 degrees with respect to the displacement. J. Submit Answer Tries 0/2 What is the sign of the work done by gravity for an elevator in Free fall? Positive Negative Zero insufficient information Submit Answer Tries 0/2 In the example below, provide the Sign of the Net work An Elevator moving upward with decreasing speed has O Negative O Positive net work being done to it. Zero insufficient information

Name: A Force of 10 N is applied for 5 m to a 10 kg box at an angle of 40 d
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Description: A Force of 10 N is applied for 5 m to a 10 kg box at an angle of 40 degrees with respect to the displacement.J.Submit AnswerTries 0/2What is the sign of the work done by gravity for an elevator in Free fall?PositiveNegativeZeroinsufficient informati

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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Which of the statements below is true when you catch a baseball that comes at you horizontally? a. The work that you do is positive. b. The work that you do is negative. c. Work is not a vector and cannot be referred to as positive or negative. d. Work is a scalar product expressed in terms of magnitudes, so it is never negative. e. Work is expressed in terms of kinetic energy, which must be positive.
Question 1 The first question does not require the coefficient of friction. Doesn't all the work being performed by the system = friction? Friction is the only thing that is performing work?
A cart for hauling ore out of a gold mine has a mass of 443 kg, including its load. The cart runs along a straight stretch of track that climbs a shallow 4.01° incline. Track -.Rope A Track incline Horizontal ground Find the work Wa that the donkey performs on the cart during this process. Find the work Wg that the force of gravity performs on the cart during this process. Calculate the work Wf done on the cart by friction during this process. A donkey, which is trudging along and to the side of the track, has the unenviable job of pulling the cart up the slope with a 389 N force for a distance of 157 m by means of a rope that is parallel to the slope but makes an angle of 13.5° with the track. Model the rolling resistance of the cart as though it were sliding on the track with a coefficient of friction of 0.0171. Use g = 9.81 m/s², and note that angle A in the image is the angle of the incline while angle B is the angle the rope makes with the track. Wa = J J W% = W₤ = J
A box slides down a plank of length d that makes an angle of θ with the horizontal as shown. μk is the kinetic coefficient of friction and μs is the static coefficient of friction. 1.Enter an expression for the minimum angle θ (in degrees) the box will begin to slide. 2.Enter an expression for the nonconservative work done by kinetic friction as the block slides down the plank. Assume the box starts from rest and θ is large enough that it will move down the plank. 3.For a plank of any length, at what angle θ (in degrees) will the final speed of the box at the bottom of the plank be 0.85 times the final speed of the box when there is no friction present? Assume μk = 0.39.
Problem 8 A chain 25 feet long whose weight is 99 pounds is hanging over the edge of a tall building and does not touch the ground. How much work is required to lift the entire chain to the top of the building?
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For a constant force, work is defined as the: Cross product between the force and the displacement. O Magnitude of the force multiplied by the distance travelled. O The squared product between the force and the distance O Scalar product between the force and the displacement
Which of the following statements are true? Select all correct. Question 3 options: If an object speeds up, then the total work done on the object was positive. If an object moves at a constant speed, then the work done by each individual force is zero A force must be parallel to the displacement to do any work. If a force is perpendicular to displacement, it does zero work. If a force has a component in the opposite direction of the displacement, it does positive work. If an object doesn't move, then the work done by every individual force must be zero.
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QUESTION 16 A crate of mass, m, slides down a plane inclined at an angle, 0, to the horizontal for a distance x down the incline. If the coefficient of kinetic friction between the inclined surface and the crate is µk. what is the work done by friction? a. -Hkmgxcose b. -mgxcose C. -mgxcose/µk d. -µkmgxtane e. -mgxsin0