Ahorse pulls a cart along a flat road. they start from rest and as time goes on their speed increases. consider the following four forces:

the force of the horse pulling on the cart;

the force of the cart pulling on the horse;

the force of the horse pushing on the road

the force of the road pushing on the horse.

which of the following statements is true concerning these forces?

force 2 exceeds force 4.

force 2 is less than force 3.

force 3 exceeds force 4.

forces 1 and 2 cannot have equal magnitudes.

force 1 exceeds force 2.

Which of the following represents a virtual image?

Dinate system, and a charge q = - 2.00 nc is placed s2 10 n> c. (a) what is the change in electric potential energy when the dipole moment of a molecule changes its orientation with respect to es from parallel to perpendicular? (b) at what absolute temperature t is the average translational kinetic energy 32 kt of a molecule equal to the change in potential energy calculated in part(: abovethistemperature, thermalagitationprevents the dipoles from aligning with the electric field.) placed in a uniform electric field e with magnitude 1.6 * 6 on the positive x-axis at x = 4.00 cm. (a) if a third charge q3 = +6.00 nc is now placed at the point x = 4.00 cm, y = 3.00 cm, find the x- and y-components of the total force exerted on this charge by the other two. (b) find the magnitude and direction of figure p21.62 ll uu 21.55 . torque on a dipole. an electric dipole with dipole moment ps is in a uniform external electric field es. (a) find the orientations of the dipole for which the torque on the dipole is zero. (b) which of the orientations in part (a) is stable, and which is unstable? (hint: consider a small rotation away from the equi- librium position and see what happens.) (c) show that for the stable orientation in part (b), the dipole’s own electric field tends to oppose the external field. 21.62 ..

Most short-period comets do not have randomly oriented orbits because