douglaswinslowcooper
Name:
Douglas Cooper
School:
About:
AB, physics, Cornell, 1964. MS, physics, Penn State, 1969. Ph.D., engineering, Harvard, 1974. Retired in 2000, after about 30 years experience, including college teaching and industrial research, primarily in environmental areas. douglas@tingandi.com
Most Active Subjects
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Medals Received 622
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Questions Answered
Daudetmae:
Group Title
Are magnets of the same size equally strong?
updated 10 months ago
3 replies
No Medals Yet
Mathematics
sidsiddhartha:
Group Title
why we cannot use schrodinger's equation for relativistic particles?
updated 10 months ago
9 replies
2 Medals
Mathematics
Hotchellerae21:
Group Title
@Hero
Find the reciprocal of the number. Multiply to check your answer.
…
updated 10 months ago
5 replies
2 Medals
Mathematics
HannahMa:
Group Title
Which statement is true?
A. Eisenhower chose Robert Taft as his running mate, because Taft had been president before.
…
updated 10 months ago
2 replies
No Medals Yet
Mathematics
WhisperZ:
Group Title
Anyone mind helpin me with this?
Determine which system below will produce infinitely many solutions.
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updated 10 months ago
9 replies
1 Medal
Mathematics
Minhazminu:
Group Title
What is meant by critical angle of water medium in respect to air medium?
updated 10 months ago
2 replies
No Medals Yet
Mathematics
ShainaDancer:
Group Title
Please Help.. =( im so confused on this Question..=(
Answer question in 2 too 3 sentences.
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updated 10 months ago
3 replies
1 Medal
Mathematics
daniella14:
Group Title
anybody good in geometry ?? ill give a medal to each person who helps me pleasee
updated 10 months ago
5 replies
No Medals Yet
Mathematics
keiyuchan:
Group Title
14r + 43 = 25r + 219
R = ?
updated 10 months ago
3 replies
1 Medal
Mathematics
j3llimari3:
Group Title
Evaluate the function at the indicated values
f(x)=x^2+5x
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updated 10 months ago
1 reply
No Medals Yet
Mathematics
MajorLegend:
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What is the value of x?
updated 10 months ago
11 replies
1 Medal
Mathematics
RoseDryer:
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Please help! I have a decent amount of questions I need help with. And it all has to been turned in by tonight can someone help me?
updated 10 months ago
7 replies
No Medals Yet
Mathematics
Ammarah:
Group Title
draw an angle with the given measure in standard position.
updated 10 months ago
6 replies
2 Medals
Mathematics
hisgirl:
Group Title
how do you find frictional force
updated 10 months ago
3 replies
1 Medal
Mathematics
Trill:
Group Title
the internal energy of an ideal gas depends on
updated 10 months ago
2 replies
1 Medal
Mathematics
ShainaDancer:
Group Title
Combine each pair of sentences below to form one sentence that contains subordinated information about a noun. An example is given.
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updated 10 months ago
11 replies
1 Medal
Mathematics
dakotacheyennecollins:
Group Title
The diameter of a circular pool is 18 feet.
What is the approximate area of the pool?
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updated 10 months ago
3 replies
No Medals Yet
Mathematics
professional_loser_:
Group Title
The approximation sqrt(1+x) can be approximated by 1+(x/2) when x is small. estimate the maximum error when |x| < 0.01.
updated 10 months ago
1 reply
1 Medal
Mathematics
kk54:
Group Title
What is the missing term, x, in the pattern below?
1, 16, x, 256, 625, …
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updated 10 months ago
3 replies
No Medals Yet
Mathematics
ajl96:
Group Title
Tell how to solve for 50^x = 17 how solving would be different if the bases were equal.
updated 10 months ago
1 reply
No Medals Yet
Mathematics
barbie15:
Group Title
Let u = <-3, -5>, v = <-3, 1>. Find u + v.
<-2, -8>
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updated 10 months ago
14 replies
3 Medals
Mathematics
cheema_:
Group Title
Which of the following is true about global pandemics?
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updated 10 months ago
4 replies
No Medals Yet
Mathematics
dpierre35:
Group Title
When would the velocity of a wave traveling in a medium change?
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updated 10 months ago
3 replies
No Medals Yet
Mathematics
zconflict:
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The model below represents a nuclear reaction. Atom 1 is present before the reaction and Atom 2 and Atom 3 are produced after the reaction.
updated 10 months ago
1 reply
No Medals Yet
Mathematics
massiel928:
Group Title
would it be A or C?
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updated 3 months ago
1 reply
1 Medal
Mathematics
Parth1994:
Group Title
2 ln 7x = 5
updated 10 months ago
4 replies
1 Medal
Mathematics
RayRay1:
Group Title
h(x) = 5x2 - 4x
Find: h(-3)
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updated 10 months ago
2 replies
No Medals Yet
Mathematics
CrazyCountryGirl:
Group Title
Who's REALLY good at Force and Motion - 8th grade?
updated 10 months ago
17 replies
1 Medal
Mathematics
eng_chen:
Group Title
what effect would adding additional neutrons have on the forces in a nucleus?
…
updated 10 months ago
3 replies
No Medals Yet
Mathematics
js7474:
Group Title
WILL GIVE MEDAL PLEASE HELP!
which of the following is not true of both ancient Chinese and ancient Greek cultures
A- both developed a sy…
updated 10 months ago
8 replies
1 Medal
Mathematics
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