physics of human body

1. What is momentum? How does it affect football and rugby players?
2. What is drag and how does it affect swimmers?
3. Why does a skater spin faster when he or she bring their arm in close?
4. Without going into detail briefly describe the two ways x-rays are produced
5. Very briefly, without detail, describe the four ways x-rays interact with the tissues in the body and note which ways image the body and which ways are used to kill cancer.

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