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Chapter 14: Q15 CQ (page 437)

When ski jumpers are airborne (Fig. CQ14.15), they bend their bodies forward and keep their hands at their sides. Why?

Short Answer

Expert verified

The skier bends forward in order to deflect the air stream downwards. The air stream, in turn, deflects her upward. So the pressure on his back will be less than the pressure on his front, lifting his higher and giving a longer trajectory.

Step by step solution

01

Archimedes’ principle

When an object is partially or fully submerged in a fluid, the fluid exerts on the object an upward force called the buoyant force. According to Archimedes’s principle, the magnitude of the buoyant force is equal to the weight of the fluid displaced by the object:

02

Explain the reasoning

The skier bends forward in order to deflect the air stream downwards. The air stream, in turn, deflects her upward. So the pressure on his back will be less than the pressure on his front, lifting his higher and giving a longer trajectory.

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