7. Which free-body diagram in Figure 3 describes the relative size of the forces that the passengers on the plane experience when they are 15 seconds into the flight maneuver? a. Diagram A Ob. Diagram B c. Diagram C Od. Diagram D Which free-body diagram in Figure 3 describes the relative size of the forces that passengers on the plane experience when they are at an elevation of about 34000 feet? O a. Diagram A Ob. Diagram B Oc. Diagram C Od. Diagram D *2 pointi *2 pointi sensations that are experienced. Figure 2 The sensation of weightlessness is due to the absence of support forces. Normally, an 80-kg astronaut would experience about 800 Newton of upward force. This upward force balances the downward force of gravity. It is the presence of the upward force that gives an astronaut a sensation of weight. When in a zero-G environment as shown in Figure 2, this upward force is absent and the astronaut has no sensation of having weight, they feel weightless. Sensations of heaviness are experienced when the support force is greater than the downward force of gravity. This sensation occurs when a downward moving astronaut is slowing down. If the support force is three times greater than the force of gravity, then the astronaut is said to be experiencing three G's of force. The diagrams in Figure 3 are free-body diagrams. The arrows represent the two forces Figure 3: Sensations of Weight acting upon an astronaut under normal conditions (A), partially weightless conditions (B), perfectly weightless conditions (C), and heavier-than- normal conditions (D). support A grav B support GLO F support T D grav