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1. Perform a backoftheenvelope calculation to estimate the
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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

 

correct.)

 

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

 

readings

 

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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