In a pa projection of the chest being used for cardiac evaluation, the heart measures 15.2 cm between its widest points. if the magnification factor is known to be 1.3, what is the actual diameter of the heart?

a. 9.7 cm
b. 11.7 cm
c. 19.7 cm
d. 20.3 cm

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