How JustAnswer Works:

  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.

Ask Ray Atkinson Your Own Question

Ray Atkinson
Ray Atkinson, Graduate Student
Category: Homework
Satisfied Customers: 1794
Experience:  Degrees in Math, Education and Accounting, years and years of tutoring.
29937297
Type Your Homework Question Here...
Ray Atkinson is online now
A new question is answered every 9 seconds

Assume for this question that biological tissue is 100% water.

Resolved Question:

Assume for this question that biological tissue is 100% water. Given that the density of water is
roughly 103 kg/m3 estimate the mass of (a) a human cell of diameter 1 μm = 10−6 m and (b) a
honey bee.
Submitted: 2 years ago.
Category: Homework
Expert:  Ray Atkinson replied 2 years ago.

Ray Atkinson :

Are you given the volume of a honeybee?

JACUSTOMER-uyfuw5na- :

1cm

Ray Atkinson :

Ok, thank you. I will get this written up right away.

JACUSTOMER-uyfuw5na- :

thanks

Ray Atkinson :

That is the diameter of the bee, correct?

Ray Atkinson :

or is it 1 cm³?

JACUSTOMER-uyfuw5na- :

he was not precise i think it was the size

Ray Atkinson :

Actually, since (1 cm)³ = 1 cm³, it does not matter.

Ray Atkinson :

The formula for volume from a diameter is 4/3*π*(d/2)³, so the human cell is 4/3*π*(5 * 10^(-7))³ = 5.23598776 * 10^-19 m³


 

Ray Atkinson :

forgive me, but i am having tech problems tonight. Computer keeps freeziong on me.


 

JACUSTOMER-uyfuw5na- :

sorry but where did you get 4/3? i was using formula density = m/v

Ray Atkinson :

Going from diameter to volume of a sphere is 4/3*π*r³

Ray Atkinson :

and r = d/2

JACUSTOMER-uyfuw5na- :

he said we do not have to use the radius he wants the density

Ray Atkinson :

You need the volume before you can use the density formula.

Ray Atkinson :

The question is to find the mass. You are given water as mass/volume. You need to get the volume to solve.

JACUSTOMER-uyfuw5na- :

sorry is this for the bee or cell

Ray Atkinson :

The mass of the cell is 5.23598776 * 10^-19 m³ * 103 kg/m³ =NNN-NN-NNNN* 10^-19 kg = 5.39306739 * 10^-17 kg

JACUSTOMER-uyfuw5na- :

could you explain via a formula d=v/m please

Ray Atkinson :

Sorry, frozen again. Be patient with me.

JACUSTOMER-uyfuw5na- :

no problem


 

Ray Atkinson :

Sure. density is mass over volume. 103 = m / 5.23598776 * 10^-19


Solve for m by multiplying both sides by 5.23598776 * 10^-19 to get m = 5.39306739 * 10^-17

Ray Atkinson :

I am going to assume the 1 cm for the honeybee is the diameter, since you were given the diameter for the other problem.

Ray Atkinson :

[Is this showing on your side?]

Ray Atkinson :

v = 4/3 * π * (0.005 m)³ = 4/3 * π * 1.25 * 10^-7


d = m/v, so 103 kg/m³ = m / 1.25 * 10^-7 m³


Multiply both sides to 1.25 * 10^-7 to get


1.2875 * 10^-5 kg

JACUSTOMER-uyfuw5na- :

ok


 

Ray Atkinson :

Does that all make sense? If not, I can write it up in a word file with all the units lined up for you.

JACUSTOMER-uyfuw5na- :

whats the unit for the 5.23 ans

Ray Atkinson :

kilograms. That is the unit that is given by your instructor for the mass of water.

Ray Atkinson :

It is also the standard form of mass units.

JACUSTOMER-uyfuw5na- :

could you write up a word file cause i am lost

Ray Atkinson :

Certainly. How fast do you need it?

Ray Atkinson :

It's about midnight there, right?

Ray Atkinson :

(I'm never sure with daylight savings time)

JACUSTOMER-uyfuw5na- :

its 2am

JACUSTOMER-uyfuw5na- :

like asap

Ray Atkinson :

All right. I'll get on it. Will have it all doen within a half hour. Will work?

Ray Atkinson :

plus I need to seriously reboot this computer.

JACUSTOMER-uyfuw5na- :

ok i will be waiting

Ray Atkinson :

Ok, I'm on it. I'll be back as soon as I can.

JACUSTOMER-uyfuw5na- :

i am confused the diameter of the cell is 10cubes

JACUSTOMER-uyfuw5na- :

how do you superscript in this chat

Ray Atkinson :

hold down <alt> and type 253 to get ², and type 0179 to get ³


 

Ray Atkinson :

If the diameter is 1 cm, then the radius is 0.5 cm. The volume is 4/3 * π * (0.5 cm)³

Ray Atkinson :

0.5 cm = 0.005 m = 5 · 10^-3 m


(5 · 10^-3 m)³ = 125 * 10^-9 m

JACUSTOMER-uyfuw5na- :

no the diameter of the cell is 10^-6m

Ray Atkinson :

Oh, I get it. That is 10 to the -6 power. 0.000001 m

Ray Atkinson :

Half that is 0.0000005 m is the radis

JACUSTOMER-uyfuw5na- :

yes

Ray Atkinson :

= 5 · 10^-7

JACUSTOMER-uyfuw5na- :

can you please give me both ans explained so i can finish my revision question

Ray Atkinson :

I am typing right now

JACUSTOMER-uyfuw5na- :

thanks

Ray Atkinson :

Attachment: 2012-09-28_010236_diameters.doc

Full Size Image


See if you can read this.


 

Ray Atkinson :

The numbers look very similar, since the diameters are 5*10^-7 m and5*10^-3 m

Ray Atkinson :

oops. Radii, not diameters.

JACUSTOMER-uyfuw5na- :

thanks got quest 1 but where do you get (5x10^7)??

JACUSTOMER-uyfuw5na- :

in you ans in word you sent me its after phi

Ray Atkinson :

phi?

Ray Atkinson :

oh pi

JACUSTOMER-uyfuw5na- :

yes

Ray Atkinson :

For some reason, the last cople things you typed are not showing. I am going to switch this to Q&A format rather than chat, so I can see everything.

Ray Atkinson, Graduate Student
Category: Homework
Satisfied Customers: 1794
Experience: Degrees in Math, Education and Accounting, years and years of tutoring.
Ray Atkinson and 5 other Homework Specialists are ready to help you
Expert:  Ray Atkinson replied 2 years ago.
Our chat has ended, but you can still continue to ask me questions here until you are satisfied with your answer. Come back to this page to view our conversation and any other new information.

What happens now?

If you haven’t already done so, please rate your answer above. Or, you can reply to me using the box below.
Expert:  Ray Atkinson replied 2 years ago.
Since the diameter is 1·10^6, the radius is half that, so is 0.5·10^-6 = 5·10^-7
Expert:  Ray Atkinson replied 2 years ago.
Is everything else there clear?
Customer: replied 2 years ago.
The accept button is not working how do I give you credit
Customer: replied 2 years ago.
,
Expert:  Ray Atkinson replied 2 years ago.

Rate the answer, please. That is how to give credit for the answers now.

Expert:  Ray Atkinson replied 2 years ago.
My chat with you is marked as the answer. If that did not set it, then this one will.
Expert:  Ray Atkinson replied 2 years ago.
If there is a problem with my answer, please let me know so I can improve it. Otherwise, please rate my answer.

JustAnswer in the News:

 
 
 
Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.
 
 
 

What Customers are Saying:

 
 
 
  • Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help. Mary C. Freshfield, Liverpool, UK
< Last | Next >
  • Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help. Mary C. Freshfield, Liverpool, UK
  • This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!! Alex Los Angeles, CA
  • Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult. GP Hesperia, CA
  • I couldn't be more satisfied! This is the site I will always come to when I need a second opinion. Justin Kernersville, NC
  • Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around. Esther Woodstock, NY
  • Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know. Robin Elkton, Maryland
  • He answered my question promptly and gave me accurate, detailed information. If all of your experts are half as good, you have a great thing going here. Diane Dallas, TX
 
 
 

Meet The Experts:

 
 
 
  • Manal Elkhoshkhany

    Tutor

    Satisfied Customers:

    4522
    More than 5000 online tutoring sessions.
< Last | Next >
  • http://ww2.justanswer.com/uploads/BU/BusinessTutor/2012-2-2_115741_Kouki2.64x64.jpg Manal Elkhoshkhany's Avatar

    Manal Elkhoshkhany

    Tutor

    Satisfied Customers:

    4522
    More than 5000 online tutoring sessions.
  • http://ww2.justanswer.com/uploads/ComputersGuru/2010-02-13_051118_Photo41.JPG LogicPro's Avatar

    LogicPro

    Engineer

    Satisfied Customers:

    3458
    Expert in Java C++ C C# VB Javascript Design SQL HTML
  • http://ww2.justanswer.com/uploads/LI/lindaus/2012-6-10_04811_IMG20120609164157.64x64.jpg Linda_us's Avatar

    Linda_us

    Finance, Accounts & Homework Tutor

    Satisfied Customers:

    3124
    Post Graduate Diploma in Management (MBA)
  • http://ww2.justanswer.com/uploads/chooser77/2009-08-18_162025_Chris.jpg Chris M.'s Avatar

    Chris M.

    M.S.W. Social Work

    Satisfied Customers:

    2385
    Master's Degree, strong math and writing skills, experience in one-on-one tutoring (college English)
  • http://ww2.justanswer.com/uploads/JawaadAhmed/2009-6-27_12137_SIs_SHadi.jpg F. Naz's Avatar

    F. Naz

    Chartered Accountant

    Satisfied Customers:

    1988
    Experience with chartered accountancy
  • http://ww2.justanswer.com/uploads/JK/jkcpa/2011-1-16_182614_jkcpa.64x64.jpg Bizhelp's Avatar

    Bizhelp

    CPA

    Satisfied Customers:

    1876
    Bachelors Degree and CPA with Accounting work experience
  • http://ww2.justanswer.com/uploads/avremote/photoa.jpg Seanna's Avatar

    Seanna

    Tutor

    Satisfied Customers:

    1781
    3,000+ satisfied customers, all topics, A+ work
 
 
 

Related Homework Questions

Chat Now With A Tutor
Ray Atkinson
Ray Atkinson
Tutor
1794 Satisfied Customers
Degrees in Math, Education and Accounting, years and years of tutoring.