. What is the work done due to rotation of electric-dipole in external electric field? (a) W = pE(1 – cosθ)

(b) W = pE tanθ

(c) W = pE secθ

(d) None of these

The bar of prob. 5/82 is repeated here. the ends of the 0.4-m bar remain in contact with their re- spective support surfaces. end b has a velocity of 0.5 m/s and an acceleration of 0.3 m/s2 in the di- rections shown. determine the angular accelera- tion of the bar and the acceleration of end a.

What is the force that opposes motion and works against the downward pull? a) friction b) gravity c) weight d) acceleration

Which one of the following terms is used to indicate the natural tendency of an object to remain at rest or in motion at a constant speed along a straight line? velocity acceleration equilibrium force inertia