Which planet has the highest average surface temperature, and why?
a. mercury, because of its dense carbon dioxide atmosphere.
b. venus, because of its dense carbon dioxide atmosphere.
c. mercury, because it is closest to the sun.
d. jupiter, because it is so big mars, because of its red color.

The substances that are necessary for producing of certain hormones and that store and transport vitamins

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

With physics question #5? for any !