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a) Pulling on two pieces of wood that have been glued together

18 / 01 / 2019 Physics

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1.    An empty 330 mL bottle weighs 200 g.  If the bottle was half filled with water, would you predict that it would sink or float?  Use the concept of density to justify your answer.  Assume that 1 mL of water weighs 1 gram.                                        (3 marks)

2.    James, an astronaut, weighs in at 75.5 kg before departure to a newly discovered, human friendly planet in another galaxy.  On arrival at the new planet, James notices that his weight is 48.0 kg. During the trip, James was careful to sustain his regular dietary intake and maintained excellent health.  In your opinion, does James have any cause to be concerned of this apparent weight loss? In your answer you should include discussion around terms such as weight, mass, gravity etc.                    

3.    Identify the major type of force that is being applied in each of the following situations:     (3 marks)

a)    Pulling on two pieces of wood that have been glued together

b)    Standing on an empty coke can

c)    Wheels on a bitumen surface

4.    Pressure can be described as being either hydrostatic or hydrodynamic.  Explain which of these terms should be used when discussing cardiac output?                          

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