Posted by **howard** on Friday, July 12, 2013 at 12:19am.

Three forces act on a moving object. One force has a magnitude of 83.4 N and is directed due north. Another has a magnitude of 47.2 N and is directed due west. What must be (a) the magnitude and (b) the direction of the third force, such that the object continues to move with a constant velocity? Express your answer as a positive angle south of east.

- physics -
**Steve**, Friday, July 12, 2013 at 3:57pm
if the object moves with constant velocity, there must be no acceleration, hence no net force.

If the two known forces are u and v, we need w = -(u+v) so that u+v+w = 0.

So, convert to rectangular components, add them up, and take the negative sum for the 3rd force.

- physics -
**Henry**, Thursday, December 24, 2015 at 4:11pm
F1+F2+F3 = M*a = M*0 = 0.

83.4i - 47.2 + F3 = 0.

F3 = 47.2 - 83.4i = 95.83 N.[60.5o] S. of E.

## Answer This Question

## Related Questions

- PHYSICS - Three forces act on a moving object. One force has a magnitude of 81.2...
- physics - Three forces act on a moving object. One force has a magnitude of 62.6...
- physics - Three forces act on a moving object. One force has a magnitude of 83.4...
- physics - Three forces act on a moving object. One force has a magnitude of 61.9...
- PHY 131 - three forces act on a moving force object. one cforce has a magnitude ...
- PHYSICS - 3 FORCES ACT ON MOVING OBJECT.FIRST FORCE HAS MAGNITUDE OF 80.0N AND ...
- Physics - A 301-kg boat is sailing 16.5° north of east at a speed of 2.08 m/s. ...
- physics - A 301-kg boat is sailing 16.5° north of east at a speed of 2.08 m/s. ...
- physics - A 316-kg boat is sailing 12.0° north of east at a speed of 1.60 m/s. ...
- Physics - A 343-kg boat is sailing 16.2° north of east at a speed of 1.98 m/s. ...

More Related Questions