Asquare plate has an area of 29.00 cm2 at 20.0 ? c. it will be used in a low temperature experiment at t = 10.0 k where it must have an area of 28.00 cm2. what area must be removed form the plate at 20.0 °c for it to have the correct area at 10.0 k? (the coefficient of linear expansion is 10 10-6(° c)-1 .)

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