My professor doesn\'t post worked out solutions. THANK YOU in advance! 7). A for

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My professor doesn't post worked out solutions. THANK YOU in advance!

7). A force F acts on an object undergoing a displacement s, the force being oriented at an angle with respect to the displacement. Which one of the following correctly describes ALL of the circumstances under which the work done by the force is zero? A). The force is zero, or the displacement is zero, or the angle is 90°. B). The force is zero, or the angle is 90°. C). The force is zero, or the displacement is zero, or the angle is 180°. D). The force is zero, or the displacement is zero 8). A force F(x)-(4x-3r)i N acts on an object at it moves along the x-axis from the origin to x = 2 m. The work done by this force on the object is: A). 9J B). 18J C). -20J D). Zero

Explanation / Answer

7] option A is correct. work = F s cos theta

8] W = integral Fdx = 2x^2 - x^3, now putting x =2,

= 2*2^2 - 2^3 = 0

option d is correct

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