61. As a pilot comes out of a dive in a circular arc, she experiences an upward acceleration of 9.0 gs. a) If the pilot's mass is 60 kg, what is the magnitude of the force applied to her by her seat at the bottom of the arc? b) If the speed of the plane is 330 km/h, what is the radius of the plane's arc? 62. Earth is a satellite of the Sun with an orbit radius of approximately 1.5 x 10" m. a) What is the Sun's mass? b) If the Sun's radius is 6.96 X 10 m, how does the Sun's density compare with Earth's density