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Posts by ANON

Total # Posts: 2,762

Chemistry
(a) Which of the following are requirements for anionic polymerization? --A double bond --End groups which can react by releasing a small molecule --A strong base to initiate the reaction --A strong acid to initiate the reaction --An electron-withdrawing group near the double ...

Chemistry
finally i got it F Cl COOCH3

Chemistry
COOCH3 and CH2CH3 is wrong

Chemistry
COOCH3 is wrong

Math
i don't understand that problem the one that is up there i need the answer like now though

Chemistry
Did you find the last quetion of homework 11?

Chemistry
thanks

Chemistry
@Drew can you give me the formula?

Chemistry
1- 7.36e-2 189 2-metal Solid hydrogen has a half filled s-band insulator Solid helium has a filled s-band 3-1.13 semiconductor 4-Ionization of phosphorus requires some minimum temperature n_type The concentration of conduction electrons is fixed by the concetration of ...

Chemistry
if someone help with those questions I'll post all the rest of answers

Chemistry
3//1.13 ev semiconductor 4//4th option n-type 4th option intrinsic

Chemistry
a)The Young's modulus for a material is 5.0*10^10 N/m2. The material is stretched to a strain of 4.0*10^-3. How much elastic energy will be expended? (Express your answer in J/m3) Knowing that the energy associated with the formation of 1 mole of vacancies in copper (Cu) ...

Solar Energy
it is wrong! I'm sure!

Biology
Please help! i was wondering why a genome size determined in a lab would be smaller than that of the actual. thanks

Biochemistry
Please help! i was wondering why a genome size determined in a lab would be smaller than that of the actual. thanks

science
it is d

Physics please HELP
1- 19.2E-19 2-??? 3-1 4-4.8E-5 5-3.84e-23 6-h-(2*ke*lambda*q)/(l*ks) 7-(E*q)/(m*g) 8-D 9-7e-6 10-3.6e7 11-??? 12-3rd option 13-54e9 14-408.5E-12 15-4.902E-9 16-2.451E-9 17-6000 18-96E-17 19-1053787047200878.1558726673984632 20-increase 21-stay the same 22-increase 23-increase ...

Science
1. The sporophyte generation produces spores that grow into a(n) (1 point) gametophyte. gymnosperm. angiosperm. pupa. 2. Placental mammals develop (1 point) in an egg laid in water. in a pouch on the mother’s body. inside the mother’s body. inside an amniotic egg. 3...

Chemistry
How would I extract benzophenone from acetylsalicylic acid? thanks

Chemistry
If I have 1.00 mM NaCl and 4.32 mM NaCl, how do I calculate the ionic strengths of each? Thanks

PHYSICS(HELP)
For v_1, you have sqrt(v_0^2 - 2*G*(L(1 - cos(alpha)))), right? For tension, you use T = Fgravitational + Fcentrifugal, where Fg = m*g*cos(alpha) and Fc = m*(v_1)^2/L. Then for max height you'll have something like this: (v_1 * sin(alpha))^2/(2*G), and for alpha you use ...

PHYSICS(HELP)
Well, think a little... If you're at an infinity distance, your gravitational potential must be zero, as you see: -mMG/distance, if distance is infinity, it doesn't metter -mMG as somehow it is some constant. So, you have some velocity at "infinity" so you ...

english
As a kpop fan, People become so fascinated with the style of kpop that they just want to keep on comprehending what it is. It maybe the dance, the singing, the power even more! These kpop stars bring so much talent on the stages every time they perform. That's why they are...

science
It is A

ET3034TUx Solar Energy
Thank you! but it's not only a) !!

ET3034TUx Solar Energy
Which of the following processes is used in order to fabricate mono-crystalline silicon? a) The Czochralski process b) Silicon ribbon process c) The float-zone process d) The silicon casting process

Chemistry
How do I determine which atom in a molecule would be the strongest base? Thanks

Solar Energy Please Help
@foxman thinks

Math
Use substitution to solve the system of equations given below. 8x - 4y = 16 2x - y = 4

science
i think

science
destin y is rong

science
desiny isn't right

Chemistry
Help! If I have 0.0031 absorbance/sec, how would I convert this to absorbance/minute? Thanks

calculus
I really need help on this!!!!

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

Math- Urgent
2e = 4e -16 -4e -4e -2e=-16 /-2 /-2 e=8

math
x+4=-8 do you have to solve for x?

math
I completely forgot the rules but.... if you have ((1-x)^1/2)^2 Then would you multiply the exponents to get 2/2 = 1 or add them to get 3/2

algebra
2 cm. i think

Math please help
You have to set up a proportion. 2/3 = 12/x solve for x 2x=36 x=18

algebra
3. I think Because you take the total number of problems (48) and divide that by 2 = 24. Then divide that by 2 = 12. And divide that by 2= 6. And divide that by 2 = 3. He needs to complete 3 problems on the first day for the number of problems completed to double each day for ...

math
please help me. I don't know what I am doing wrong

math
I tried to use the quotient rule but I get stuck simplifying it. I got (sqrt1-x^2)(1/sqrt1-x^2) - (x+arcsinx)(1/2(1-x^2)2x) / (sqrt1-x^2)^2

math
*use the quotient rule

math
I get stuck on the second derivative, trying to get it to equal 2-x^2/(1-x^2)^3/2. I think that from my first derivative, you have to sure the quotient rule

math
xarcsinx*

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

Science help! URGENT. Check answers
If anybody is still looking for the answers to this quiz, I got a 100 with these answers: 1. False 2. C 3. D 4. B 5. D 6. A 7. B 8. A On number 9, give an example in change of velocity. The change of velocity is known as acceleration, and it is the rate at which velocity ...

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 ...

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).

Can someone check these answer for me?
The correct answers are 1. B 2. A 3. C 4. D 5. C I just took this and got 100%

Solar Energy Help ASAP
0.674 can someone help with the others quetion? Q4 5 6 7?

geography
cultural divergence

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 ...

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 ...

Science help! URGENT. Check answers
'somemone' is wrong because acceleration is the rate at which velocity changes, and the change can be speed, direction, or both and the eagle is constantly changing direction. The answers the asker chose are correct.

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...

Science
These answers are correct. 1. B 2. B 3. B 4. A - True

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 ...

chemistry
5.51 x 10^5 quads

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) ...

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 ...

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 ...

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...

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