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Physical Science 10 questions

Date Posted: 19/02/2020
Category: Science
Due Date: 19/02/2020
Instruction
Answer the following questions no plagiarism 1. What do you think is the reason scientists use an ellipse rather than a circle as the model for a planetary orbit? 2.What are the different steps involved in a scientific process and provide details about each step? 3. What happens if the gravitational attraction between the Earth and the Moon disappears? Similarly, if the Moon loses its orbital motion, does it still rotate around the Earth? Provide proper reasoning? 4.What are the fundamental units in the S.I system? Why scientist use S.I system only? 5. What is gravity? How many fundamental forces we know and explain those in detail? 6. A woman walks 70m to an elevator and then rises upward 40m. What is her displacement from her starting point? 7. A car is moving at 10m/s when it begins to be accelerated at 2.5m/s2. (a) How long does the car take to reach a speed of 25m/s?. (b) How far does it go during this period?. 8. A force of 20N gives a brick an acceleration of 5m/s2. (a) What force would be needed to give the brick acceleration of 1m/s2? (b) An acceleration of 10m/s2? 9. A person weighs 85N on the surface of the moon and 490N on the surface of the earth. What is the acceleration of gravity on the surface of the moon? 10. What centripetal force is needed to keep a 1Kg ball moving in a circle radius of 2m at a speed of 5m/s?
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