Polar molecules have attractive dipole-dipole interactions when the dipoles are arranged in which of the following geometries? select all that apply:
a) head-to-tail: →→
b) head-to-head: →←
c) side-to-side, antiparallel: ↑↓
d) side-to-side, parallel: ↑↑

An athlete swings a ball, connected to the end of a chain, in a horizontal circle. the athlete is able to rotate the ball at the rate of 8.13 rev/s when the length of the chain is 0.600 m. when he increases the length to 0.900 m, he is able to rotate the ball only 6.04 rev/s. (a) which rate of rotation gives the greater speed for the ball? 6.04 rev/s 8.13 rev/s (b) what is the centripetal acceleration of the ball at 8.13 rev/s? m/s2 (c) what is the centripetal acceleration at 6.04 rev/s? m/s2