11/18/17

I dont understand how to do this partial derivative
If z=f(x,y), where x=rcosϴ and y=rsinϴ, find ∂2z/ ∂r∂ϴ.    I have the complete solution in my book but have cant understand anything.Please help !
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11/18/17

Find the acceleration of the books:
A Student moves a box of books with a rope by pulling the rope with a force of 90 N at an angle of 30°.   The books have a mass of 20 kg and a coefficient of friction between the box and floor is... more
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11/18/17

Fill in the blanks
The intensity of a beam of nature light is Iο, when it pass through a polarizer, then the intensity of the transmitted wave I is ____________.
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11/18/17

IF sinA-cosA=1 and sinA.cosA=0 then proe that sinA + cosA = +/- 1
IF sinA-cosA=1 and sinA.cosA=0 then proe that sinA + cosA = +/- 1
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11/18/17

i don’t understand how to do doubling
The count in a bacteria culture was 300 after 10 minuets and 1900 after 30 minuet. assuming the count grows exponentiall,  what is the initial siz of the cultur?, find the doubling perio?, find the... more
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11/17/17

Laplace transform of f(t)=t^2e^-1
Please solve this question in Laplace transform of f(t)=t^2e^-1
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11/17/17

At the beginning of an experiment, a scientist has 320 grams of radioactive goo. After 75 minutes, her sample has decayed to 5 grams.
i dont understand this problem due by 12 please help  
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11/17/17

Is each line parallel, perpendicular, or neither parallel nor perpendicular to the line −2x+3y=12?
Mathmatics
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11/17/17

Geometrical word problem
A cube with an edge of 20 cm is filled with water. Would this amount of water fit in a sphere with a 20 cm radius?
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11/17/17

what is One more than the difference between 18 and seven times a number is -9 as an equation
I dont understand how to turn this word problem into a word problem
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11/17/17

Four cubes of ice with an edge 4 cm each are left to melt in a cylindrical glass with a radius of 6 cm. How high will the water rise when they have melted?
 Mathematics Syllabus D1.
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11/17/17

Newton's second law + force of friction
A 4kg box sits on top of a truck, where the static friction coefficient is 0.2. Determine the maximum acceleration of the truck before the box starts to slide
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11/17/17

The ratio of Liquid X to Liquid Y in a mixture is 3 to 7. If the amount of Liquid Y in a mixture is 161, then the amount of Liquid x is equal to
have the answer dont understand the math
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11/17/17

In some places i see a being reserved for x axis and b for y axis, but others uses a for y axis if the ellipse is vertical or the hyperbola opens up and down.
a and b use in ellipse and hyperbola
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11/17/17

why was the battle of saratoga particularly signifigant in the american revolution
the chooses are  a.) it showed the key role of merchant ships b.) it resulted in huge loss of life on both sides c.) it pursuaded the french to provide active help d.) it forced the british to... more
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11/17/17

the product of two consecutive positive integers is 342 what is the bigger integer in the two consecutive integers
Need lots of help please
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11/17/17

why was persia's standing army important factor in persia's rapid growth?
dad told me to use this for anwsers.
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11/17/17

To find minimum electron energy.. Question of wave optics
We wish to see inside an atom. Assuming the atom to have a diameter of 100pm . This means that one must be able to resolve a width of say 10 pm. if an electron microscope is used , the minimum... more
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11/17/17

4 rules of exponents
This problem consists of multiplying exponents,
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11/16/17

If an apple weighs 1N. When held at rest above your head what is the net force on the apple
I need help on this question in less than 20 minuites
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11/16/17

How would the number of solutions for an equation with two variables differ from the number of solutions for an equation with only one?
Recall that variables represent changing values. In this unit, you will work with equations that contain two different variables. What types of situations might be modeled with equations containing... more
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11/16/17

When the dependent variable increases when the independent variable increases the rate of change is?
is it a positive, negative, zero, or undefined?
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11/16/17

What steps do I need to use to solve this atomic structure problem?
Which element is being referred to? Explain your answer.   E1  577.4 kJ/mol E2   1,816 kJ/mol E3.   2,744 kJ/mol E4.   11,580 kJ/mol E5.    15,048 kJ/mol   Answer Choices:   A) Na B)... more
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11/16/17

Newton's gravity and weight qs
An astronaut has a mass of 80 kg, but on an unknown planet, the bathroom scale reads 15 kg when the astronaut stands on it. What is the astronaut's weight and the gravitational field strength on... more
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11/16/17

Write an equation that passes through and is parallel to (3,-5) y=2x-1
Idksbsbxbxbnxxnxnxnznzjzj
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