Assignment 2 - Page 88, #1 The orbits of the planets around...

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Page 88, #1 The orbits of the planets around the Sun and the orbits of satellites around these planets are always ellipses rather than perfect circles. Why? The planets orbit around the sun, and the satellites that orbit around the planets, are affected by gravity from the sun and other celestial objects (such as empty space). The effects of gravity at different locations during their orbits prevent their orbits from being perfect circular, and they become elliptical. Page 88, #2 When riding in a car, we can sense changes in speed or direction through the forces the car applies on us. Do we wear seat belts in cars to protect us from speed or from acceleration? Explain your answer. We wear seat belts in cars to protect us from acceleration. Acceleration means how fast change in velocity can happens. When we go from 0 to 100 km in 5 seconds we feel the back of our seat shoving our body forward, causing us to accelerate alone with the car. Same as, when we break or turn, we are experiencing of acceleration. To protect us from hitting the cars steering wheel or
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This note was uploaded on 10/19/2011 for the course ASTRONOMY 1001 taught by Professor Barry during the Spring '11 term at Dalhousie.

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Assignment 2 - Page 88, #1 The orbits of the planets around...

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