An adult inhales about 6. 0×10−4 m3 of fresh air during a breath. Only 20% of fresh air is oxygen. Assume the pressure in the lungs is 1. 0×105 pa and the air is at a temperature of 300 k.

Ateacher attaches a ball to a meter long string and whirls it around in a horizontal circle at constant speed. the teacher explains that the string is what makes the ball go in a circle. why is the string necessary? a) the string is needed to apply a torque to the ball. b) the string is needed to push on the ball to get it up to speed. c) circle motion requires an inertia which is provided by the string. d) circle motion requires a force to give it a centripetal acceleratio