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webassign physics

webassign physics - Work Energy Chap.6-7 Part 1 A constant...

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A constant 85 -N force acts on a 5.00 kg box. The box initially is moving at 20 m/s in the direction of the force, and 3.0 s seconds later the box is moving at 71 m/s. Determine both the work done by this force and the average power delievered by the force during the 3.0-second interval. By what factor does the kinetic energy of a car change when its speed is quadrupled ? Consider the following. (a) Find the force F x associated with the potential-energy function U = Ax 7 , where A is a constant. (b) At what value(s) of x does the force equal zero? A 4 kg object is given a displacement s = 1 m + 1 m - 1 m along a straight line. During the displacement, a constant force = 4 N - 4 N + 3 N acts on the object. (a) Find the work done by for this displacement. (b) Find the component of in the direction of the displacement. Find the power input of a force acting on a particle that moves with a velocity for each of the following situations. (a)

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webassign physics - Work Energy Chap.6-7 Part 1 A constant...

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