Monday

July 28, 2014

July 28, 2014

Total # Posts: 1,339

**math**

Sorry i meant x arrsin x. So I thought the first derivative of that would be x/sqrt1-x^2 + arcsinx

**math**

Let y = arcsin x, x is an element of ]-1, 1[. Show that d^2y/dx^2 = 2-x^2/(1-x^2)^3/2

**math**

ok thank you.

**math**

do you just change all the signs of the terms? if so, why is this necessary?

**math**

Thanks. I was wondering, why is it "+ sin x" in the second step?

**math**

cos2x-sinx=0. Factor and solve for sinx

**physics**

Part b) is working forces. So you have centripetal acceleration = N-kx where kx is the spring force. cent acc = mv^2/r so us a)to derive this.

**physics**

Use this link it shows the question you are solving , but it has slightly different parameters ie the equilibrium of the spring. It show that you need GPE + EPE = KE + GPE + EPE ie TOP=SIDE. You can then rearrange this to get everything on one side except v (your speed). I can...

**physics**

Use this link it shows the question you are solving , but it has slightly different parameters ie the equilibrium of the spring. It show that you need GPE + EPE = KE + GPE + EPE ie TOP=SIDE. You can then rearrange this to get everything on one side except v (your speed).

**Solar Energy Help ASAP**

0.674 can someone help with the others quetion? Q4 5 6 7?

**ET3034TUx Solar Energy**

The current density of an ideal p-n junction under illumination can be described by: J(V)=Jph−J0(eqVkT−1) where Jph is the photo-current density, J0 the saturation-current density, q the elementary charge, V the voltage, k the Boltzmann's constant, and T the te...

**ET3034TUx Solar Energy**

The width of the space charge region at a p-n junction is reduced by applying a voltage bias over the p-n junction. What is the correct statement on both the bias voltage and the p-n junction? a)The voltage is a forward bias and the diffusion of the majority charge carriers be...

**Physics**

oscillating block ans D) 1.2

**Physics**

When you push down on the handle of a bicycle pump, a piston in the pump cylinder compresses the air inside the cylinder. When the pressure in the cylinder is greater than the pressure inside the inner tube to which the pump is attached, air begins to flow from the pump to the...

**Physics**

A sample of a monatomic ideal gas is originally at 20 °C. Calculate its final temperature of the gas if the pressure is doubled and volume is reduced to one-fourth its initial value.

**Science **

Humans developed antibiotics to fight bacterial infections. However, some antibiotics are no longer efective in killing the bacteria they once killed. How does the theory of evolution explain this?

**physics**

A 660 kg car is being pushed along a flat parking lot at a constant speed of 1.52 m/s. The coefficient of friction between the road and the car is 0.31. What force is being used to push the car?

**Quantum Physics**

Wrong !!!! I try it!!

**Quantum Physics**

Ive checked and its neither phi=2bt nor 2b

**Quantum Physics**

Q 7 and 8 Please!!!

**Quantum Physics**

3b - C 3c - 0

**Chemistry**

12.111111111

**physics**

Consider an ideal spring that has an unstretched length l0 = 3.9 m. Assume the spring has a constant k = 20 N/m. Suppose the spring is attached to a mass m = 6 kg that lies on a horizontal frictionless surface. The spring-mass system is compressed a distance of x0 = 1.7 m from...

**Physics**

A conical pendulum is constructed from a rope of length l and negligible mass, which is suspended from a fixed pivot attached to the ceiling. A small ball of mass m is attached to the lower end of the rope. The ball moves in a circle with constant speed in the horizontal plane...

**reading**

TKU :)

**reading**

How is grandmother's dream different from reality? >Last night I dreamed of an old lover I had not seen him in forty years. When I awoke, I saw him on the street. His hair was white, his back was stooped. How could I say hello? He would have puzzled all day about who th...

**Physics**

A person is standing on the edge of a cliff of height h= 24 m. She throws a stone of mass m=0.2 kg vertically down with speed v0= 10 m/s (stone 1) and another stone of the same mass vertically up at the same speed (stone 2). The gravitational acceleration is g=10 m/s2. (a) Wha...

**physics**

We are standing at a distance d=15 m away from a house. The house wall is h=6 m high and the roof has an inclination angle β=30 ∘. We throw a stone with initial speed v0=20 m/s at an angle α= 35 ∘. The gravitational acceleration is g=10 m/s2. (See figure)...

**physics**

We are standing at a distance d=15 m away from a house. The house wall is h=6 m high and the roof has an inclination angle β=30 ∘. We throw a stone with initial speed v0=20 m/s at an angle α= 35 ∘. The gravitational acceleration is g=10 m/s2. (See figure)...

**physics**

An elevator is stopped at the ground floor. It starts moving upwards at constant acceleration a>0 for 5 seconds. It then keeps a constant speed for 35 seconds. Finally, it slows down with an acceleration of the same magnitude (but opposite direction) −a , until it com...

**physics**

An elevator is stopped at the ground floor. It starts moving upwards at constant acceleration a>0 for 5 seconds. It then keeps a constant speed for 35 seconds. Finally, it slows down with an acceleration of the same magnitude (but opposite direction) −a , until it com...

**physics**

We are standing at a distance d=15 m away from a house. The house wall is h=6 m high and the roof has an inclination angle β=30 ∘. We throw a stone with initial speed v0=20 m/s at an angle α= 35 ∘. The gravitational acceleration is g=10 m/s2. (See figure)...

**physics (it's rather urgent help is appreciated**

no

**physics (it's rather urgent help is appreciated**

yeah

**physics (it's rather urgent help is appreciated**

@ss01 for the inclined wall stone throw

**physics (it's rather urgent help is appreciated**

@ss01 did you manage to find the time?

**physics**

i can't quite get the value of t

**physics**

thank you so much, sorry for being rather spamy so to say

**physics (it's rather urgent help is appreciated**

We are standing at a distance d=15 m away from a house. The house wall is h=6 m high and the roof has an inclination angle β=30 ∘. We throw a stone with initial speed v0=20 m/s at an angle α= 35 ∘. The gravitational acceleration is g=10 m/s2. (See figure)...

**Chemistry**

Calculate the magnitude of the cohesive energy of potassium iodide (KI). The ionic radii of K+ and I−, are 152 pm and 206 pm, respectively. Assume the Born exponent n is 10. Assume a Madelung constant of 1.7. Please report your answer in kJ/mol or how to calculate it.

**Chemistry**

Calculate the magnitude of the cohesive energy of potassium iodide (KI). The ionic radii of K+ and I−, are 152 pm and 206 pm, respectively. Assume the Born exponent n is 10. Assume a Madelung constant of 1.7. Please report your answer in kJ/mol or how to calculate it.

**Bio/Math**

A population of glasswing butterflies exhibits logistic growth. The carrying capacity of the population is 200 butterflies, and rmax, the maximum per capita growth rate, of the population is 0.10 butterflies/(butterflies*month). Calculate the maximum population growth rate for...

**AP Bio; PLEASE HELP!**

if a fish farmer wanted to harvest his fish so that it recovered at the maximum rate, where should the population be maintained? There is a graph number of weeks vs. numbers of fish. and A B C and D marked on the graph. How do I figure it out??

**Chemistry**

Finally I found it.We have to do this : wavelength=h/P P^2=2*m*E P=sqrt(2*m*E) E = joule h = Planck's constant m = kg

**Chemistry**

Can you write the result because i found 5.067e-7 and it's wrong.I try it many time in diffrent ways baut I finished with the some result!

**Chemistry**

Calculate the wavelength of a proton with energy 2.45 eV. Please some help!

**Classical Mechanics**

thank you it help me!

**Classical Mechanics**

Mary wants to throw a can straight up into the air and then hit it with a second can. She wants the collision to occur at height h=5.0 m above the throw point. In addition, she knows that she needs t1=4.0 s between successive throws. Assuming that she throws both cans with the...

**Chemistry**

Calculate the wavelength of a proton with energy 2.45 eV.

**BIOLOGY**

yes, no, yes is correct

**science**

Green algae grow in the fur of the South American sloth. The green algae provide camouflage for this tree-doweling mammal, and from the fur and skin of the sloth the algae obtain moisture. A moth also lives in the fur. The moth larvae provide waste material used by the algae a...

**Social studies**

then 4

**Social studies**

Which of the following "best" illustrates how a President can use the news media to reach the largest segment of the public? 1) hold a state dinner for foreign dignities 2) hold a conference Cabinet members 3) meet with head of Congressional committees 4) give speech...

**Social studies**

Suppose the president vetoed a bill passed by Congress. According to the information, which of the following actions by Congress would most likely ensure that the bill will become? 1) let the veto stand 2) reintroduce the same legislation 3) try to override the veto with a two...

**social studies**

I think it's (2). Is it correct?

**social studies**

A 150 years ago nearly 3/4 of the working people in this country worked on farms. By the beginning of the 1980s only 1/40 did. Clearly automation "destroyed" many farms jobs. But if technology were really eliminating work, we would expect unemployment . The reason mo...

**social studies**

I'm kind indecisive on first question (either answer: 1 or 3)

**social studies**

Question 1: I have (5) Question 2: I have (c) 2>>Based on the result of the studies, what should an elementary teacher do to unsure that a child with an unusual name develops normal intellectual ability? a- Make a special effort to ignore the child b- Try to give the ch...

**social studies**

Does having an unusual name, such as Chastity, Englebert or Moon unit, have an effect on how a child develops? The results of some previous studies agrees with the commonsense idea that such as name could cause a child to be rejected or ridiculed and thus could have a negative...

**social studies**

When choosing a name for a child, how could a parent best use this study to help ensure the child's normal social development? 1 keep in mind that other characteristics are more important than name 2try not to choose an ethnic name 3Consider an unusual name because it will...

**Quantum physics**

@ Lord The circuit is a phase change (Z) with a Hadamard (H); plug in the eqn (simple arithmetic if u understand the material) TY for ans tho, wish i knew how u arrived to it, i wrote out all the y's and i couldnt figure out s

**Quantum physics**

ANS TO 3 IS c WATS Q10?

**Quantum physics**

7)A) I,H 7)B) X,H

**Quantum physics**

Someone give me Q3 and I give him/her all the others questions!

**Quantum physics**

any1 got the ans to q 10?

**Quantum physics**

Hey can any1 help me with question 10, on my last try, i cant seem to figure it out

**Quantum physics**

Ans to q2 above, i can help with the other 2q's

**Math**

Find the derivative of y=sin(x)*(sinx+cosx)

**AP Calc**

How do you find the derivative of y=sin(x)*(sinx+cosx)

**AP Calc**

Find the equation of the tangent line at the indicated point. y=5th root of (3x^3+4x) at (2,2)

**Biology**

You are testing a hypothesis that population density of a particular plant species influences the rate at which a pathogenic fungus infects the plant. Because the fungus causes visible scars on the leaves, you can easily determine whether a plant is infected. Design an experim...

**8th Grade Math**

cancel out the denominator by multiplying by greatest common factor so 2. 2(5/2t-t)=2(3+3/2t) so now equation is 5t-2t=6+3t then solve. 3t=6+3t you should get no solution

**thermodynamics**

Use the Gibbs Free Energy Equation: ^G=^H-T^S ;where ^ represents Delta. Plug in the values and you are done! Remember to convert 25C to Kelvin.

**physics**

Use Couloumb's law: F=q1q2/d^2 We get force is inversely proportional to the square of the distance. Solve the rest yourself.

**math**

Which situation can be modeled by tossing a coin three times? a. choosing which one of sixteen teams will win a tournament c. selecting a desk from thirty-six in a classroom b. deciding which English teacher of eight will win a trip to London d. picking one of six math teachers

**Math**

so b?

**Math**

cause i dont understand what you saying

**Math**

Just tell the answer

**Lab math**

You are doing a red blood count with a standard dilution of 1/200. The area counted is 10 red squares in a Neubauer chamber. Under these conditions, what is the factor that would be used to determine the number of cells in the undiluted blood?

**Chemistry/lab math**

Thank you very much for this further clarification; I understand what it is asking now.

**Chemistry/lab math**

Okay when you set up the equation likewise for potassium and solve it the same way is the answer supposed to be the same? I'm just confused as to whether the question is asking if each should be prepared differently or it's just one solution you're working with.

**Statistics**

Some answers are wrong.

**English**

What are the stories that go with each of the tools that Sanders discusses in his essay "Inheritance of Tools?" I don't really understand what the question wants, so I started by saying the history of the hammer. What can I write about the other tools?!

**Math**

if x and y are two different integers in S, which of the following must be the square of an integer I. (x-1)(y-1) II. 4(x-1) III. x^2+y^2 a. none b. I only c. II only d. III only e. I and II

**Math**

each "word" in a special code is a three digit number. if no word in the code can begin with a 1 or 0, what is the greatest number of different words the code can contain? 28 512 800 900 1000

**Math**

if an integer is added to its square, the units' digit of this sum could be....? 1 2 3 4 5

**Math**

a drugstore had a promotion in which $0.50 was refunded to customers for each $10.00 spent on merchandise. if a customer spent $20.00 on merchandise during this promotion, the refund was equal to what % of the amount spent? 1 1/4% 2 1/2% 5% 25% 50%

**Math**

if x is r percent of y and if k is s percent y, then x is what percent of k? 100(r+s)% 100/rs% 100r/s% 100s/r% rs/100%

**Math**

in a league with 6 teams each team is scheduled to play each other team exactly twice. what is the total number of games that are scheduled in the league?

**math**

if x,y, and z are different integers and x+y+z=3, what is the least possible value of z? -3 1 2 3 cannot be determined from information given

**math**

if c+4=2a+7b, what is the value of c+6 in terms of a and b? 4a+7b 2a+7b-2 2a+5b+2 2a+9b 2a+7b+2

**math**

thank you

**math**

when a large cake is cut into pieces that each weigh 3 ounces, it yields 110 pieces. how many pieces would the cake yield if it were cut into 2 ounce piece instead?

**math**

a total of $24.00 is to be divided among three children in amounts proportional to their ages. if the children's age are 9, 12, and 15 years, how much money will the YOUNGEST recieve? 2 3 4 5 6

**Math**

Jason has to sell a box of candy bars for a fundraiser. Yesterday he sold 1/3 of the total number of candy bars that came in the box, and today he sold 3 candy bars. If his sales for these two days was 11/30 of the total number of candy bars that came in the box, how many cand...

**Stats**

A pizza parlor has 13 different toppings available for its pizzas, and 2 of these toppings are pepperoni and anchovies. If a customer picks 2 toppings at random, find the probability that pepperoni is one of the toppings. Round to four decimal places.

**AP Calc**

Solve the following absolute value inequalities: |x+1|<=|x-3| I promise I'm not posting my whole homework assignment. These are questions that I skipped and have no clue how to do out of a huge packet.

**AP Calc.**

ohmygosh.. i'm an idiot.. thank you! you're the bestt!(:

**AP Calc.**

How did you go from the original question to the 1st step?

**AP Calc.**

but don't you have to get rid of the negative exponents somehow..?

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