Calculate the work done by friction as a 3.7 kg box is slid along a floor from point A to point B in the figure along paths 1, 2, and 3. Assume that the coefficient of kinetic friction between the box and the floor is 0.19. (Figure 1) Enter your answers numerically separated by commas. Express your answers using two significant figures.   W1,W2,W3= ______ J

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Please only answer D and E with work shown please, thank you.

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 A new type of force was discovered by physicists with the following expression:   where alpha & beta are constants, and x is the position. The expression above was obtained from the interaction of a massless Higgs Boson (a type of particle) and a black hole. Quantum physicists then decides to design and build a machine that is able to move the Higgs Boson from x2 to x1. How much work should the machine do to achieve this feat? (For simplicity, consider that no energy is lost in the process) Solution To determine the work done we apply the following W = dx Evaluating the above, we get W = |     |  +  e  +  x              for the limits from xi to xf substituting x1 and x2 as the limits, the work done is expressed as W = |   /   |   +   (      x1    -            )          +          (      x15   -    x25   )

Indicate (with a T of F) whether the statement is true or false. If false, change the underlined word or phrase to make the statement true. A bicycle moving at 5.0 m/s at sea level has more potential energy than a motionless bicycle at the top of a mountain. Mechanical work is calculated by multiplying the magnitude of a force times the amount of time it is applied. The SI unit for work is the joule. One joule is equivalent to 1N: m in SI units 5 tv MacBook Pro

Maddie is pulling on a rope to drag her backpack to school, across the ice. She pulls with a force of 427 N at an angle of 35 degrees above the horizontal. She drags her backpack a horizontal distance of 221 meters to the right. Determine Maddie's work done upon the backpack. Round your final answer to a whole number.

An external force is acting on a system, the work done on the system is change in its kinetic energy. a) True b) False

A student slides a 2,50 kg textbook across a table, and it comes to rest after travelling 1.15 m. The friction coefficient between the table and the book is 0.35. How much is the initial speed of the book?If wewanted the book to slide a distance of 3.50 m, how much should be the friction coefficient between the table and the book?

Problem A new type of force was discovered by physicists with the following expression:   where alpha & beta are constants, and x is the position. The expression above was obtained from the interaction of a massless Higgs Boson (a type of particle) and a black hole. Quantum physicists then decides to design and build a machine that is able to move the Higgs Boson from x2 to x1. How much work should the machine do to achieve this feat? (For simplicity, consider that no energy is lost in the process) Solution To determine the work done we apply the following W = ___ dx Evaluating the above, we get W = ___ | ___ |  +  ___ e ____ +  ___ x ____              for the limits from xi to xf Substituting x1 and x2 as the limits, the work done is expressed as W = ___ | ___ / ___ |   +  ___ ( ___ x1 - ___ )  + ___ (  x15  -  x25  )