Saturday

March 28, 2015

March 28, 2015

Posted by **Matt** on Tuesday, March 13, 2007 at 8:41am.

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)

**Answer this Question**

**Related Questions**

College Physics - The graph shows the force exerted on an object versus the ...

physics - true or false If a net force acts on an object, the object's speed ...

physics - A,1.5kg,object,moves,up,the,y,axis,at,a,constant,speed.When,it,reaches...

physics - a 1.5-kg object moves up the y-axis at a constant speed. When it ...

physics - An object in the vacuum of space orbits the earth at a fixed speed in ...

physics - An object in the vacuum of space orbits the earth at a fixed speed in ...

physics - An object in the vacuum of space orbits the earth at a fixed speed in ...

physics - An object in the vacuum of space orbits the earth at a fixed speed in ...

physics - An object in the vacuum of space orbits the earth at a fixed speed in ...

physics - An object in the vacuum of space orbits the earth at a fixed speed in ...