1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

(help me in this two questions )

  1. Oct 28, 2009 #1
    hi all

    (help me in this two questions )

    I put two questions with ansewr and i want the solve of it ?


    Question1.JPG


    ansewr questions 1

    Answer Question 1.JPG


    -----------------------

    questions 2

    Question2.JPG
     
  2. jcsd
  3. Oct 28, 2009 #2
    answer questions 2

    Answer Question 2.JPG
     
  4. Oct 28, 2009 #3

    Mark44

    Staff: Mentor

    Your attachments are appending approval, and they might not be approved for quite a few hours. You are more likely to get some help sooner if you enter the problem directly in the forum textbox.
     
  5. Oct 28, 2009 #4
    I want check my answer and in question one how i can comput the answer to 3 significant or 4 also in question 2 are this graph correct

    help me
     
  6. Oct 29, 2009 #5
    I want check my answer and in question one how i can comput the answer to 3 significant or 4 also in question 2 are this graph correct

    help me
     
  7. Oct 29, 2009 #6

    HallsofIvy

    User Avatar
    Staff Emeritus
    Science Advisor

    Unfortunately you cut off the part of the problem that gives the coefficient of t. Are you using the "," to separate whole and decimal parts (European notation) or to separate thousands (American notation). In other words is that coefficient "one and three hundred eighty six thousandths" or is it "one thousand three hundred eighty six"?

    If it is the latter, you are way off. Do the whole problem again. If it is the former, you have misplaced the comma in the answer. As for writing it to "three significant figures" what do you understand "significant figures" to mean?

    I don't understand your question in (2). "How can I know in (some symbol) demand N or N0". I might guess that "N" means "natural numbers" (positive integers). Does "N0" mean "whole numbers" (non-negative integers).

    If you are asking whether the domain is intended to be all positive integers or all non-negative integers, the answer is "neither"! The default domain for an exponential function is all real numbers- both positive and negative, and fractions, etc.

    I would recommend using at least two or three negative numbers, as well as 0 and three or four positive values. (For t= 5 you seem to have confused "," and "." again.)
     
  8. Oct 29, 2009 #7

    Mark44

    Staff: Mentor

    Your graph is nowhere close to what it should be. You have calculated some value that satisfy N = e1.386t, but the three points you plot are on a straight line, and two of y values you plotted don't agree with the values you calculated. The graph of N = e1.386t is NOT a straight line.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: (help me in this two questions )
Loading...