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1. Perform a backoftheenvelope calculation to estimate the

i was wondering if you could help me solve out in details the questions i attached here in today by midnight at most pls. its like college intro physics and its confusing. I just need solutions. Thanks.

1. Perform a back­of­the­envelope calculation to estimate


the power that can be generated by a Canada Goose


(e.g., to take off). Look up the value and compare your


answer. What units did you choose for your estimate?


Were you within 50% error? Within an order of


magnitude? (Answers below are a poll; all are counted




a) More than an order of magnitude too low


b) Within an order of magnitude


c) Within +/­ 50%


d) More than an order of magnitude too high


2. Certain everyday objects that we can relate to are often


used to describe the size of objects. For length or size,


something very small is often said to be "smaller than


the diameter of a human hair" (which is approximately


100 microns), medium­sized objects are/were


described by a human foot (specifically the King?s foot,


until it became standardized), in the U.S. large objects


tend to be described by how many ?football fields? long


or high it is. Come up with analogous examples that


represent small, medium, and large amounts of the


following quantities, and which might help a person


relate that quantity to something familiar: (i) Power (ii)


Viscosity (iii) Mass (iv) Force



3. Prior to the digital age, mercury manometers were


common devices for accurate pressure measurement.


The reason for using mercury in the manometers was:


a) So it wont evaporate


b) Its silver color makes it easier to see than other fluids


c) It wont react with water in the air and mess up




d) Its high density helps manometer to be smaller


4. A pipe is carrying fluid at 20 psi (gauge). If a tap were


inserted and hooked to a mercury manometer, what


height of fluid would be supported in units of mm Hg?


5. Assume that your total body mass is 150 lbm. Your


weight will similarly be 150 lbf on earth. (a) Use the


formula F = ma to verify this, showing all necessary unit


conversions. (b) Look up the acceleration of gravity on


the moon and determine how much you would weigh


on the moon. Answer below in units of lbf.


A plastic syringe (no needle) has a plunger 1.0 cm


diameter. The outlet of the syringe has a 0.5 mm diameter


hole. You hold your thumb over the outlet so no fluid can


escape and push the plunger with your other hand exerting


a force of 30 N. (a) what is the pressure inside the syringe in


units Pa? (b) What is the pressure inside the syringe in units



of psi? (c) what is the force exerted on your thumb that is


holding the outlet of the syringe, in units N?




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