Physics problems. Need help please urgent?

Posted on 2016-10-12 18:39:00 in Physics by JEFF

3. A force has components (in newtons) of 8i + 8j + 8k moves an object through a displacement (in meters) of 8.3i + 12.5j + 0k, to lthe nearest tenth of a Joule, what is the work done by the force? 

4. If the displacement vector in the previous problem is 1.4i + 4.6j + 0k, what angle does it make with the x-axis? 

6. A force F = (cx - 3.61x2) i acts on a particle as the particle moves along an x axis with F in newtons, x in meters and c a constant. At x = 0,the particle's kinetic energy is 21.4 J; at x = 3.00 m, it is 12.8 J. To the nearest hundredth of a N/m find c.

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