rach_ell
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 Rachel
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 "I think it's much more interesting to live not knowing than to have answers which may be wrong."
 Richard P. Feynman
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Questions Asked

rach_ell:
Group Title
Given vector a=3, vector b=5, and vector a + vector b=7, determine vector a  vector b.
 updated 3 months ago
 1 reply
 No Medals Yet
Mathematics

rach_ell:
Group Title
Polonium210, present in tobacco, has a half life of 138 days, while polonium218 that clings to tobacco smoke has a halflife of 3.1 minute…
 updated 3 months ago
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Mathematics

rach_ell:
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Two cars are moving along a circular track of radius 40 m. The two cars were moving with constant angular speeds of 0.13 rad/s and 0.18 rad/…
 updated 3 months ago
 7 replies
 2 Medals
Mathematics

rach_ell:
Group Title
Batman is hanging on the end of a batrope at point over a busy Gotham street. If the batrope makes an angle of 45° with the vertical Batman …
 updated 4 months ago
 2 replies
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Mathematics

rach_ell:
Group Title
Given the derivative of a function, how would I find the increasing and decreasing intervals of the function? I have not learned how to take…
 updated 4 months ago
 13 replies
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Mathematics

rach_ell:
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Thermochemical Equation & Stoichiometry Question: How would I approach this problem? http://prntscr.com/31jrsk
 updated 4 months ago
 1 reply
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Mathematics

rach_ell:
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Derivative of Primary Trig Function.
 updated 4 months ago
 8 replies
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Mathematics

rach_ell:
Group Title
Implicit Differentiation.
x cos y = sin (x+y)
 updated 4 months ago
 7 replies
 1 Medal
Mathematics

rach_ell:
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Launching a spring at an angle from an elevated surface: derive a simplified expression for "x," stretch of the spring, using conservation o…
 updated 4 months ago
 58 replies
 3 Medals
Mathematics

rach_ell:
Group Title
What is the significance of carrying out the following tests on a synthesized aspirin (ASA)?
a) Sodium Bicarbonate Test
…
 updated 4 months ago
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Mathematics

rach_ell:
Group Title
I have a question about the reaction mechanism shown in this diagram: http://en.wikibooks.org/wiki/Biochemistry/Peptide_Bond_Formation
I'm …
 updated 5 months ago
 18 replies
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Mathematics

rach_ell:
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I'm studying the reaction mechanism of polymerization (condensation), specifically from several amino acids (glycine) into a polypeptide. Wh…
 updated 5 months ago
 11 replies
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Mathematics

rach_ell:
Group Title
For my project, I have to build a polypeptide chain from the polymerization reaction of two amino acid molecules (glycine). Since the bond a…
 updated 5 months ago
 17 replies
 2 Medals
Mathematics

rach_ell:
Group Title
A small mass m is tied to a ceiling of hight h=5l/4 by a string of length l and attached to the floor by a massless spring with spring const…
 updated 5 months ago
 5 replies
 1 Medal
Mathematics

rach_ell:
Group Title
A uniform bar is supported by a long uniform negligible mass spring as shown in figure 1. The spring in figure 1 is stretched 3.00 cm from i…
 updated 6 months ago
 8 replies
 3 Medals
Mathematics

rach_ell:
Group Title
Solve. Exact values are required.
3^2x2(3^x)15=0
 updated 6 months ago
 8 replies
 1 Medal
Mathematics

rach_ell:
Group Title
Factor Fully.
x^78x^416x^3+128
…
 updated 6 months ago
 9 replies
 1 Medal
Mathematics

rach_ell:
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Organic Nomenclature Question: How do I name this alkene?
http://prntscr.com/2iw3rp
…
 updated 6 months ago
 6 replies
 1 Medal
Mathematics

rach_ell:
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A block is launched up the frictionless incline in the diagram below with an initial speed of 5.5 m/s. What is the max displacement of the b…
 updated 6 months ago
 1 reply
 1 Medal
Mathematics

rach_ell:
Group Title
A 65 N force is applies to a 5.0 kg object as shown. The coefficient of friction between the object and the horizontal surface is 0.25.
…
 updated 6 months ago
 7 replies
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Mathematics

rach_ell:
Group Title
(Hooke's Law Lab)
Spring A, Spring B and Springs A+B were tested to find their stretch vs. force. …
 updated 6 months ago
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Mathematics

rach_ell:
Group Title
For the following pairs of functions, state the domain of (f*g)(x).
Question(s) can be found at the bottom or in the following image.
http:/…
 updated 6 months ago
 10 replies
 2 Medals
Mathematics

rach_ell:
Group Title
Hi, we're building a popsicle stick bridge in physics and the criteria is that it must support 70kg (160 lbs) and rest over a gap of 55cm. T…
 updated 7 months ago
 8 replies
 1 Medal
Mathematics

rach_ell:
Group Title
State a trigonometric ratio that is equivalent to each of the following trig ratios:
a) sin 3pi/10…
 updated 7 months ago
 18 replies
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Mathematics

rach_ell:
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Person A and person B are both riding bicycles, traveling due north at constant speeds. Person A is going at a velocity of 2.00 m/s and pers…
 updated 8 months ago
 5 replies
 2 Medals
Mathematics

rach_ell:
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A pool ball rolling at 10 m/s[W] strikes a cushion and rebounds with a velocity of 10 m/s[S]. What is the change in velocity of the pool bal…
 updated 8 months ago
 2 replies
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Mathematics

rach_ell:
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Solve the following equation.
…
 updated 8 months ago
 11 replies
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Mathematics

rach_ell:
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How do you determine the threshold frequency and work function of a metal from a graph? (in relation to the photoelectric effect)
*I realiz…
 updated 8 months ago
 4 replies
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Mathematics

rach_ell:
Group Title
Find the horizontal or other asymptote of the graph of the function when x is large, and find a viewing window in which the ends of the gr…
 updated 9 months ago
 3 replies
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Mathematics

rach_ell:
Group Title
Find the domain of the following rational functions.
y=(6x5)/(x^26x+4)
…
 updated 9 months ago
 16 replies
 2 Medals
Mathematics
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