Wednesday

July 23, 2014

July 23, 2014

Total # Posts: 63

**Phisics (Urgent)!!!!!!!!!!!!!!!!!!!!!!**

for part c the correct answer is the first option

**PHYSICS(help)**

q6)a)x_1=sqrt(2*g*R*m/(m*g*alpha+k)) b) t=pi/(2*sqrt((k+alpha*m*g)/m))) c) The block will move back and get catapulted up the circular track

**Classical mechanics**

lies!

**chemistry**

Hey Dick we are discussing our results here, do tag along. /display.cgi?id=1387456620

**chemistry**

0.000258

**chemistry**

1.8e-6

**chemistry**

B and both glasses will be weaker

**chemistry**

whoops i am so sorry its B

**chemistry**

i think the former CaCl2 is A, not sure about Nacl

**chemistry**

1.04e-3 p type

**chemistry**

yes 3.88e-7

**chemistry**

BN,AlAs, C,GaAs,GaP

**chemistry**

tetrahedral,2,1,1,no,no

**chemistry**

Dude its wrong again

**Solid State Chemistry**

"Both molecules are ionic but the higher melting point has a larger cohesive energy"

**Solid State Chemistry**

Which molecule ( KI or LiF ) has the higher boiling point? Select the single most important reason below to justify your choice should have the higher melting point Both molecules are nonpolar but the higher melting includes hydrogen bonding Both molecules are nonpolar but the...

**Chemistry**

Sn<Ge<Si

**chemistry**

its alright your intentions were good i can see that so your apology is accepted. sorry for being harsh when all you did was trying to help. i met up with someone who got 94 in the finals and he was kind enouigh to give me some answers 26)1, 3, 0.57; 27 (successively) 27)3,4,4...

**chemistry**

for Nb correct answer is 6.89 Volts. Thanks alot ZM for posting the wrong answer. Next time please double check before sharing your results. I tried the steps anonymous posted for K surface energy from bananas but its giving me the wrong result. Anyone else can give a try?

**chemistry**

Alright i got it 24)0.558 0.000327

**chemistry**

Yeah hi. Hil told us that can someone solve the lead solubility and tell us the end result please? Here are the steps: "This is simple Stoichiometry problem Write down PbI2 -> Pb2+ + 2I- Therefore Ksp = [Pb2+][I-]^2 From the stoich you can derive that Ksp = Cs(2Cs)^2 =...

**chemistry**

try the stereoisomers one q27, looks pretty straightforward.

**chemistry**

I am also telling the answers of those i myself got wrong in my previous tries. 10 a is 2.42e-6 I got it wrong

**chemistry**

Thanks man, i am telling you all i know.. dont worry, if you get more than 60 overall you will receive your certificate (like i did in bio despite failing in the final, they dont mention your score in the certificate) I dont know anything about gold or the graphs yet. rest all...

**chemistry**

thanks kim, thanks hil, both your answers are right. Good going!

**chemistry**

thanks for 28 it's correct, as for 12, a is yes and b is 3.88e-7 I got them correct. Thanks again. feel free to brainstorm for other questions.

**chemistry**

You are welcome, thanks. I forgot to convert from KJ/mol to J/mol! If you get anything else, pls do share on this page!

**chemistry**

Okay i am going to list down all the answers i got so far, please assist me in those which i left, if you have any: 1)156.675158119 2)5 3)90.1775147929 4)3s,3p,4s,3d,5s,5p,4f 10,2,14,6 5)-777 2.86e-10 6)8.88 dont know what part b is 7)O2, O2-2 8)tetrahedral,2,1,1,no,no 9)LiF d...

**chemistry**

thanks bob it worked!

**chemistry**

Right... I was thinking the same along the lines of light is "quantized". Thanks!

**chemistry**

even after converting to joules we get the same answer 4.835 which is wrong.

**physics**

vm = 2.213594362 Q = 0.278168471

**Physics Classical Mechanics**

@jessica b) Find Mu_s first Mu_s= (m_p/3 + m_l/2) *cotan (theta)/(m_p+m_l) a) Force = Mu_s*g(m_p+m_l)

**Physics Classical Mechanics**

23220

**classical mechanics**

v^2/(2*g)

**Classical Mechanics - Need Help Please**

thanks bw your formula worked for both q1 and merry, thanks so much for sharing with us :)

**Classical Mechanics Physics - Urgent help please**

can i have the formula atleast? I just need one more percent to earn the certificate , thank you

**Classical Mechanics Physics - Urgent help please**

greco can you please solve for my rocket question Consider a rocket in space that ejects burned fuel at a speed of vex= 1.5 km/s with respect to the rocket. The rocket burns 9 % of its mass in 310 s (assume the burn rate is constant). (a) What is the speed v of the rocket afte...

**PHYSICS(HELP)**

A yoyo of mass m=1 kg and moment of inertia ICM=0.045 kg m2 consists of two solid disks of radius R=0.3 m, connected by a central spindle of radius r=0.225 m and negligible mass. A light string is coiled around the central spindle. The yoyo is placed upright on a flat rough su...

**Physics**

Consider a rocket in space that ejects burned fuel at a speed of vex= 2.0 km/s with respect to the rocket. The rocket burns 8 % of its mass in 300 s (assume the burn rate is constant). (a) What is the speed v of the rocket after a burn time of 150.0 s? (suppose that the rocket...

**Chemistry**

The Young's modulus for a material is 17.0 x 1010 N/m2. The material is stretched to a strain of 2.0 x 10-3. How much elastic energy will be expended? (Express your answer in J/m3) answer is 340000

**Chemistry**

Never mind guys, alphawolfram did it for me :)~ any luck with the last three questions? Today is the deadline!

**Chemistry**

oops I reset it, new value of T is 1091 K somebody help please :'(

**Chemistry**

Thanks Anon and Drew for the formula, I have other exams to prepare for so this was a life saver, I appreciate it truly. I however do not know how to calculate my result using exponents so can someone please solve for T=1373 K? I would be forever grateful. If I find the answer...

**Physics Classical Mechanics**

g*(m_1-mu_k*m_2)/(m_1+ m_2+(I_c/R^2)) g*(m_1-mu_k*m_2)/(m_1+ m_2+(I_c/R^2))*t_1^2/2

**PHYSICS**

q7, the answer is a)2*pi*sqrt(((1/3*m+m)*l^2+1/2*m*R^2)/((1/2*m+m)*g*l)) b)2*pi*sqrt(((1/3*m+m)*l^2)/((1/2*m+m)*g*l)) 4a: (m_2*g)/(m_2+I_c/R^2) b: (I_c*m_2*g)/(m_2*R^2+I_c) c: sqrt((2*h*m_2*g*R^2)/(m_2*R^2+I_c))

**Physics Classical Mechanics**

R=2 m, Ic=9000 kg•m², r₀=1.2 m, m=20 kg, F=200 N, Δt=18 s. I=Ic+2I₀=Ic+2m r₀² = =9000+2•20•1.2²=9057.6 kg•m². M=Iα α=M/I=FR/I =200•2/9057.6 = 0.044 rad/s² ω=α•Δt =0.044•...

**Physics**

whoops, bw got here before me. I was wrong there. cheers sasha, hope we can help each other again in times of need.

**Physics**

k can either be 40 or 80.Thanks mouse and to all that helped. We worked as a team and we nailed it :D

**Physics**

@phy: input your derivated function (it should have an x^3 - x in it. In alphawolfram, write series (then your function, then) point (then x_0 value) and the result will be of the form f=f_0 -k(x-x_0), check your value for f_0 and k in that equation (most likely your f_0 is a ...

**Physics**

mouse how did you get q8.b) x2-x1? i know that for part d the answer is The block will stay at its resting position x2. for q6 d1) h~ is always smaller than h and for d2) t~up<t~dn and t~up<tup. both second options. need help with the other parts

**Physics**

Thanks alot mouse! after reading your hints I managed to learn how to use series in wolfram :) There should have been more directions provided with the question, the textbook description was insufficient! I havent got the spring one either but for the airliner question I have ...

**Physics**

a = (v - v0)/t = (1 m/s - 5 m/s)/(1 s) = -4 m/s^2 F = ma N - mg = ma N = m(a+g) N = (w/g)(a+g) N = w(a/g + 1) N = (500 N)(-4 m/s^2 / 10 m/s^2 + 1) = 300 N

**Physics**

240 for ur values

**physics(help)**

for second part it is m*g*tan theta

**PHYSICS (HELP!!!)**

try x_0 = 3.75. i used alphawolfram to plot the graph

**PHYSICS(HELP)**

try PE=0 as its at infinity

**Finite**

One coin is fair and one is weighted so that Pr[H] = [ 1/4]. You randomly select one of the two coins, and flip it 3 times, noting the result of each flip. What is the expected number of heads?

**world history**

I NEED THE SAME ANSWER. For my world history class.

**math**

Given the information: the sampled population is normally distributed, = 10.4, n = 60, and = 81.2. a. Find the 98% confidence interval for b. Interpret the confidence interval in Where do i begin

**stats**

How large a sample should be taken if the population mean is to be estimated with 99% confidence to within $72? The population has a standard deviation of $800 Please Help, im stuck

**MultiMedia**

What is the process of making a web portfolio?

**Accounting**

I believe that if a person does not have the answer to the question, he or she should not reply. That is a waste of others time and it is also childish.

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