A force of 8 N acts on a 2 kg object as it is displaced along the x-axis. The speed of the object when it is at x= 2m is 5 m/s.

a) what is the net work done by F(x) on the object as it is displaced from x=2m to x=8m?

sol) 8m - 2m = 6m; 6m * 8N = 48 J

b) What is the object's kinetic energy at x= 8m?

sol) Kf= Ki - W(net)
= 25J + 48 J
= 73 J (a bit too much ??)

c) what is the instantaneous power delivered by Fx when the object is at x=8m?

sol) P = F * v
= 8N * 73m/5 (?)

(a) correct
(b) E = (1/2) M V^2 + Work = 25 J + 48 = 73 J. Correct
V = sqrt(2E/m) = 8.54 m/s
(c) F*V = 8N * 8.54 m/s = 63.4 W

(Friction has been assumed negligible)

Similar Questions
  1. 6.Archimedes' principle states that the buoyant force of an object is equal to which of the following? the volume of the fluid
    1. answers icon 1 answer
  2. true or falseIf a net force acts on an object, the object's speed will change. An object's velocity will change if a net force
    1. answers icon 3 answers
    1. answers icon 1 answer
    1. answers icon 1 answer
more similar questions