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# Binbin Qi

### China University of Petroleum

3.969 total contributions since 2009

Professional Interests: Machine Learning/ Math/ Geophysics

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Satellite Orbit Altitude
*Satellite and Space Engineering - Problem #4* _This is part of a series of problems looking at topics in satellite and space...

alrededor de 7 horas ago

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How many apple
You have x apples I take from you y apples now how many apples you have ?

alrededor de 7 horas ago

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Find the y=(1:x)
Look at the question

alrededor de 7 horas ago

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How tall are you?
measures your height forexample= 175cm 180cm 169cm

alrededor de 7 horas ago

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Step number
Step number

alrededor de 7 horas ago

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20xa
Try out this test problem first. Given the variable x as your input, multiply it by two and put the result in y Good luck ...

9 días ago

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Find the area of ​​the square
There are *n²* circles inscribed in the square ABCD. The perimeter of each circle is *aπ* <<http://imgfz.com/i/3wzCeAT.png>> ...

9 días ago

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Get the area of ​​the square.
Four circles are inscribed in the square ABCD. The perimeter of each circle is *aπ*. <<http://imgfz.com/i/UzgCJut.png>> Gi...

9 días ago

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Distance Between Points
Being n the number of points (If n = 3 there would be 3 points: A, B and C). The distance between each pair of points increases...

9 días ago

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Electric Flux
Calculate the flux passing through a surface. E is electric field, A is area.

9 días ago

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3xa
Try out this test problem first. Given the variable x as your input, multiply it by two and put the result in y.

9 días ago

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4xa
Try out this test problem first. Given the variable x as your input, multiply it by two and put the result in y.

9 días ago

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Hanging cable - 02
previous problem - <https://www.mathworks.com/matlabcentral/cody/problems/45373-hanging-cable-01> The height of the poles...

10 días ago

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Hanging cable - 01
The height of the poles is h the length of the cable is l u need to find the minimum distance between the poles whic...

10 días ago

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Minimal Path - 02
Given a matrix, find the minimal path from the top left to the bottom right by only moving to the right and down so that the sum...

11 días ago

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Quarantine Days
In these quarantine days, a list of what Max may do on a typical day is given in a table with the starting hour to ending hour. ...

11 días ago

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Add all the numbers between two limits (inclusive)
In this problem you must add up "all of the numbers" between two specified limits, |a| and |b|, in which |a| ≤ |b|. However, th...

11 días ago

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Obtain the Bitcoin address associated to a given private key
All the information you need is at <https://en.bitcoin.it/wiki/Address> and you may also find helpful <https://brainwal...

12 días ago

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Propagate the effects of a blockage in a chemical plant
From the perspective of flow, a chemical plant can be described by a collection of _nodes_ and _edges_. _Nodes_ are points where...

12 días ago

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Pitting corrosion on a metal plate: Find the largest pit
You are given an N x M matrix of _ones_ and _zeros_, which represents an image of a rectangular metal plate taken from the hull ...

13 días ago

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Pitting corrosion on a metal plate: Count the number of pits
You are given an N x M matrix of _ones_ and _zeros_, which represents an image of a rectangular metal plate taken from the hull ...

13 días ago

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Momentum of an Object
P is momentum, m is mass, and v is velocity. Calculate the momentum for an object.

13 días ago

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Equilateral Triangle
The length of one side of the equilateral triangle is a. Calculate the area of ​​the equilateral triangle.

13 días ago

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Speed
x is distance, v is speed, and t is time. Calculate the speed for an object.

13 días ago

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Newton's Motion Law
F is force, m is mass, and a is acceleration. Calculate the force for an object.

13 días ago

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List the households affected by leaks in water distribution
Consider the following water distribution network, where water is pumped uni-directionally from left to right: 8...

13 días ago

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Approximate the inverse tangent by power series
Given values b (where abs(b)<=1) and n (polynomial order), write a function that calculates atan(b) by using power series.

14 días ago

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Given a base n, find the y values less or equal than 100(without 1), such that they will never produce a periodic number if we divide any whole number between some of them
A periodic number depends on the base b where we are working. So, for example the number 2/3 in decimal base is periodic(0.666...

14 días ago

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Matrix for beginners
Multiply x and y elemwise.

14 días ago

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Matrix problem for beginners
Make a matrix [0,0,0;1,1,1;2,2,2]. X=[0,1,2]

14 días ago