A meteor whose mass was about 1.5 * 108 kg struck the Earth AmE = 6.0 * 1024 kgB with a speed of about 25 kms and came to rest in the Earth. (a) What was the Earth’s recoil speed (relative to Earth at rest before the collision)? (b) What fraction of the meteor’s kinetic energy was trans- formed to kinetic energy of the Earth? (c) By how much did the Earth’s kinetic energy change as a result of this collision?

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 ..

The diagram shows four locations in the electric field of a positive point charge m. at which location is the electric potential the greatest.

What component of earth’s atmosphere exists entirely as a result of photosynthesis?