Which explains why a gas does not have a fixed shape?
select one:
a. the particles have very high speeds.
b. the particles are not compressible.
c. the particles are charged.
d. the particles vibrate.

Aball has an initial velocity of 3 m/s. if there is no friction, what is the highest it could roll?

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

Am i correct on these two physics questions?