A hockey puck of mass m is shot across a rough floor in a straight line. The puck moves in the positive x direction, and the coefficient of friction between the floor and the puck depends on position as u(x) = a + bx, where a is a dimensionless constant and b is a constant with units of m²¹. Write an expression for the work done by kinetic friction as the puck moves from x= x₁ to x= x₂. Your answer should be in terms of m, x₁, x₂, a, b, and g (the acceleration due to gravity). W= 32 g k P₂ Р 7 b h m X1 B d J n x2 (1) 789 HOME 145 6 123 0 1 NO BACKSPACE END CLEAR
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- A cable exerts a constant upward tension of magnitude 2.70 ✕ 104 N on a 2.40 ✕ 103 kg elevator as it rises through a vertical distance of 2.90 m. HINT (a) Find the work done by the tension force on the elevator (in J). J (b) Find the work done by the force of gravity on the elevator (in J).Use g = 9.8 m/s². A force of constant magnitude pushes a box up a vertical surface, as shown in the figure. The box moves at a constant speed. If the mass of the box is 5.5 kg, it is pushed 3.8 m vertically upward, the coefficient of friction is 0.35, and the angle 0 is 30.0°, determine the following. (a) the work done (in J) on the box by F (b) the work done (in J) on the box by the force of gravity (c) the work done (in J) on the box by the normal force (d) the increase in gravitational potential energy (in J) of the system of the box and earth as the box moves up the wallA cable exerts a constant upward tension of magnitude 2.06 X 104 N on a 1.80 X 10³ kg elevator as it rises through a vertical distance of 4.10 m. (a) Find the work done by the tension force on the elevator (in J). (b) Find the work done by the force of gravity on the elevator (in J).
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