1. 1. Calculate the weight (in newtons) of an astronaut (mass of 100 kg) on a planet where the acceleration due to gravity is 6.63 meters per second squared.  Round your answer to two decimal places. 
2. 2. A rubber ball with a mass of 0.20 kilograms is attached to a string and whirled around in a circle. If the string is 1.09 meters long (measured from the center of the ball to the far end of the string) and the ball's speed is 13.62 meters per second, what is the centripetal force (in newtons) acting on this ball?  Round your answer to two decimal places.