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12. Why can you not stand up without leaning forward?

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12. Why can you not stand up without leaning forward?

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Because your head needs to be over, or in front of your feet in order to stand up. It is possible but you have to have a wide leg stance that allows you to bring your feet back along the sides of the chair.

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13. Why is it harder to do sit ups when your knees are bent than your legs stretched out?

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13. Why is it harder to do sit ups when your knees are bent than your legs stretched out?

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If you do a sit-up with bent knees you will have a tendency to fall backwards because most of your body weight is distributed towards your upper body, especially in men. By straightening out your legs you distribute more weight towards your legs, which will help you stay balanced when you roll upwards into a sit-up.

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(b) is more likely to be stable as the center of mass is closer to the table if not within the table.

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For Q62. the answer is correct but the unit is wrong. For Q63. the answer needs to convert to 2 significant figure.

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All correct except Q45.a , the unit must in m^2.