zhiyuan3yu5
Name:
Laura Yu
School:
About:
“For West is where we all plan to go some day. It is where you go when the land gives out and the old-field pines encroach. It is where you go when you get the letter saying: Flee, all is discovered. It is where you go when you look down at the blade in your hand and the blood on it. It is where you go when you are told that you are a bubble on the tide of empire."
Aime moi moins, mais aime moi longtemps.
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Questions Asked
zhiyuan3yu5:
Group Title
The temperature at a point in a ball with conductivity K is inversely proportional to the distance from the center of the ball. Find the rat…
updated one year ago
No Medals Yet
Mathematics
zhiyuan3yu5:
Group Title
Let E be the region bounded on the top by the plane
z = 54
and on the bottom by the cone …
updated one year ago
No Medals Yet
Mathematics
zhiyuan3yu5:
Group Title
Let E be the region bounded by the planes x = 1, y = 2, z = 1 and
-11 + 3 x + y + 3 z = 0
.
…
updated one year ago
No Medals Yet
Mathematics
zhiyuan3yu5:
Group Title
Upon treatment with Br2/H2O, 1,3-butadiene reacts to form a halohydrin. Over
time, in the presence of the HBr generated by the reaction,…
updated one year ago
8 replies
1 Medal
Mathematics
zhiyuan3yu5:
Group Title
How to synthesize 1,2-dimethylcyclohexane from 1-methylcyclohexane.
updated one year ago
4 replies
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Mathematics
zhiyuan3yu5:
Group Title
An LR circuit is hooked up to a battery as shown in the figure, with the switch initially open. The resistance in the circuit is R = 11.0, t…
updated one year ago
2 replies
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Mathematics
zhiyuan3yu5:
Group Title
The current in the wire is given by the equation I = 2.5 - 0.6t, with positive to the right as shown. Which of the statements concerning the…
updated one year ago
8 replies
1 Medal
Mathematics
zhiyuan3yu5:
Group Title
Sometimes the 1-phenylethylamine tartrate salt crystallizes as fine needles rather than the desired prisms. The 1-phenylethylamine recovered…
updated one year ago
9 replies
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Mathematics
zhiyuan3yu5:
Group Title
if b field is decreasing into the plane and a circular coils is on the plane, what is the direction of induced current flow through the co…
updated one year ago
2 replies
1 Medal
Mathematics
zhiyuan3yu5:
Group Title
if b field is decreasing into the plane and a circular coils is on the plane, what is the direction of induced current flow through the coil
updated one year ago
5 replies
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Mathematics
zhiyuan3yu5:
Group Title
Using geometry (the interpretation of a double integral as a volume), evaluate the double integral
∫∫D sqrt(16−x^2−y^2) dA over the cir…
updated one year ago
6 replies
1 Medal
Mathematics
zhiyuan3yu5:
Group Title
Using geometry (the interpretation of a double integral as a volume), evaluate the double integral
∫∫D sqrt(16−x^2−y^2) dA over the cir…
updated one year ago
No Medals Yet
Mathematics
zhiyuan3yu5:
Group Title
the power output of a transformer is 100W. The input voltage is 25V. What is the number of loops ratio of the transformer if the output curr…
updated one year ago
5 replies
1 Medal
Mathematics
zhiyuan3yu5:
Group Title
A current of 2.45 A flows along the length of a long solid cylindrical conductor. The radius of the cylinder is 8.5 cm. The current is unifo…
updated one year ago
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Mathematics
zhiyuan3yu5:
Group Title
In which direction does a magnetic force act on an electron that is moving in the positive y-direction in a magnetic field pointing in the p…
updated one year ago
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Mathematics
zhiyuan3yu5:
Group Title
a plate occupies an elliptic region G: x^2/4 + y^2/9 less than or equal to 1. the surface density of electric charge is G(x,y)=sin^5(xy^2). …
updated one year ago
9 replies
1 Medal
Mathematics
zhiyuan3yu5:
Group Title
A plate occupies the region D shown in the diagram. ( a square with a square hole). the plate has surface density p(x,y)=9x^2 Find mass m of…
updated one year ago
6 replies
2 Medals
Mathematics
zhiyuan3yu5:
Group Title
In which direction does a magnetic force act on an electron that is moving in the positive x-direction in a magnetic field pointing in the p…
updated one year ago
7 replies
3 Medals
Mathematics
zhiyuan3yu5:
Group Title
Find the parabola of the form y=ax^2+b which best fits the points (−1,0), (4,4), (5,8) by minimizing the sum, S, of squares of the vertical …
updated one year ago
No Medals Yet
Mathematics
zhiyuan3yu5:
Group Title
In which direction does a magnetic force act on an electron that is moving in the positive x-direction in a magnetic field pointing in the p…
updated one year ago
3 replies
No Medals Yet
Mathematics
zhiyuan3yu5:
Group Title
Find the parabola of the form y=ax^2+b which best fits the points (−1,0), (4,4), (5,8) by minimizing the sum, S, of squares of the vertical …
updated one year ago
No Medals Yet
Mathematics
zhiyuan3yu5:
Group Title
A solid cylinder carries a current that is uniform over its cross section. Where is the magnitude of the magnetic field the greatest?
updated one year ago
1 reply
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Mathematics
zhiyuan3yu5:
Group Title
A square box with sides of length 1.00 m has one corner at the origin of a coordinate system, as shown in the figure. Two coils are attached…
updated one year ago
1 reply
No Medals Yet
Mathematics
zhiyuan3yu5:
Group Title
when the compass indicator is perpendicular to the north south bar magnet, the Bx is zero/maximum/unknown.
…
updated one year ago
1 reply
3 Medals
Mathematics
zhiyuan3yu5:
Group Title
in a series circuit, as light bulbs are added, the voltage at the battery increases/decreasees/remains the same
in a series circuit, as l…
updated one year ago
7 replies
1 Medal
Mathematics
zhiyuan3yu5:
Group Title
There is a uniform charge distribution of λ = 7.58e-8 C/m along a thin wire of length L = 6.24 cm. The wire is then curved into a semicircle…
updated one year ago
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Mathematics
zhiyuan3yu5:
Group Title
The figure shows a uniformly charged thin rod of length L that has total charge Q. Find an expression for the magnitude of the electrostatic…
updated one year ago
1 reply
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Mathematics
zhiyuan3yu5:
Group Title
find limit of ysin(1/(x^4+y^4)) as (x,y)--->(0,0)
updated one year ago
4 replies
1 Medal
Mathematics
zhiyuan3yu5:
Group Title
A particle is moving with a constant speed; at time t=3 it has velocity <5,6> and acceleration <c,−4>. For what c is this possible?
updated one year ago
3 replies
1 Medal
Mathematics
zhiyuan3yu5:
Group Title
The problem states:
A function f(x,y) is defined on the disc Q: x^2+y^2<=1 and equals 1 on it. The domain of f is D(f)=Q and f(x,y)=1 on Q.…
updated one year ago
6 replies
1 Medal
Mathematics
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