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Posts by Anonymous

Total # Posts: 108,523

Maths
There are no typos but a square prism is a rectangular prism

Physics
I'm trying to find the relationship between electric field strength and distance from point charge as an equation. I found the equation cd = E/(c*c). c is the factor by which the distance changes and E is the field strength. Is the equation good enough?

trigonometry
Rewrite 4sin(x)-5cos(x) as Asin(x+phi)

Chemistry
How much heat is absorbed when a 35.0 g aluminum block increases in temperature from 23°C to 33°C? Specific heat of Al: 0.900 J*g-1*°C-1 q=ms?T q=(35.0 g)(.900)(33°C - 23°C) q= 315 J? Just making sure there isn't anything that I am missing.

Chemistry
Which response presents ions in order of increasing atomic radius? a) smallest Cl-, K+, Na+ largest b) smallest Cl-, Na+, K+ largest c) smallest K+, Na+, Cl- largest d) smallest Na+, K+, Cl- largest I would assume the answer would be D since the electrons are more tightly ...

Chemistry
What volume of 0.200 M K2C2O4 is required to completely react with 30.0 mL of 0.100 M Fe(NO3)3? 2Fe(NO3)3 + 3K2C2O4 --> Fe2(C2O4)3 + 6KNO3

Chemistry
Which electron transition in a hydrogen atom will emit a photon with the longest wavelength? n = 2 to n = 1 n = 3 to n = 1 n = 1 to n = 2 n = 1 to n = 3 I would assume it would be a short electron transition since energy and wavelength are inversely related. But I am a little ...

English
a sense of fear gushed throughout my body does it make sense?

math
well first of all: 1/3 log (ab)^3 = (1/3)(3) log (ab) = log (ab) now log (ab) = log a + log b (that is how your slide rule works) (you do not have a slide rule?) (google slide rule :) so what we have here is x+y

physics
Radiant emittance is R=?T? The solar radiation power is N=RS?=?T?4?(r?)², where S? is the Sun surface, and r? is the Sun radius. The power radiated by the Sun falls on the inner surface, which radius is equal to the distance from the Sun to the Earth - r?. This area is ...

Chemistry
Which element is oxidized and which element is reduced in this redox reaction? CO2(g) + H2(g) --> 2CO2(g) + H2O(g) Is Oxygen oxidized and hydrogen reduced?

Chemistry
What is the net ionic equation form the reaction between Na2S(aq) and Pb(HCO3)2(aq)? Just wanting to make sure this correct: 2Na+(aq) + S2-(aq) + Pb2+(aq) + 2HCO3-(aq) --> 2Na+(aq) + 2HCO3-(aq) + PbS(s)

Chemistry
What mass of NO2 is formed by the complete reaction of 2 mol O3 with excess NO in the reaction? O3 + NO --> O2 + NO2 I know the molar mass of O3 is 48 g/mol and NO2 46 g/mol a) 23.0 g b) 46.0 g c) 92.0 g d) 96.0 g

Chemistry
What is the empirical formula for a compound of sodium and oxygen that contains 59% by mass? I am guessing it would be NaO because the molar mass of Na is 22.99 g/mol and 22.99 g/mol Na / 22.99 + 16 is approx 59%. Just wanted to make sure that is correct.

Chemistry
Okay, that makes since. The % amount of hydrogen in water is going to stay the same no matter how many grams of water you have.

Chemistry
Would it be 5.560%?

Chemistry
A 10.000 g sample of water contains 11.19% H by mass. What would by the %H in a 20.000 g sample of water? I got 22.38%, would that be correct?

Chemistry
Which compound has the highest lattice energy? a) CaO b) LiF c) MgO d) NaF I am guessing B because Lithium has the lowest energy level?

Chemistry
An unknown metal, m, forms an ionic compound with the formula, M2S3. Which formula represents the compound formed by the metal with oxygen? a) MO b) MO2 c) MO3 d) M2O3

Chemistry
HI is formed from the overlap of a hydrogen 1s orbital with an iodine 3p orbital? is that correct? I am having trouble with the iodine orbital, thank you.

Calculus
Consider the differential equation dy/dx = 2x - y. Let y = f(x) be the particular solution to the differential equation with the initial condition f(2) = 3. Does f have a relative min, relative max, or neither at x = 2? Since we're trying to find a max/min I don't ...

Chemistry
Total area = 5.0 x 101 x 2.10 m^2 =_____m^2 Total solar power falling on heliostats = 1420 W/m^2 x _____ m^2 = ______W 26700 W * 100 / ______W = ______% efficiency.

Math
I added from a and b 3+2=5 and the 4 was left then added =4=9. I really didn't know what I was doing your right I just didn't know =4 was left it was just a guess

Math
That's all information they gave me.

Math
So the answer would be 31 -13 _____ 18

Math (integrals) (Substitution)
=- ? (4-u)sqrt(u) du =- ? (4-u)u^(1/2) du ***= -4?u^.5du + ?u^1.5 du ***= -4(u^1.5/1.5) + u^2.5/2.5 + c ***= -(8/3)u^(3/2) + (2/5)u^(5/2)+c we disagree about sign of second term =- ? 4u^(1/2) - u^(3/2) du =-4? u^(1/2) - u^(3/2) du =-4((2/3)u^(3/2) - (2/5)u^(5/2)) =-4((2/3)(4-x...

typo
VOLTAGE = I R sin wt

physics
7.75 * 1.414 If current = I sin wt and current = I R sin wt then power = I^2 R sin^2 wt average of sin^2 = (1/2) so average power = (1/2)I^2 R = Irms^2 R so I^2 = 2 Irms^2 and as we said to start I = sqrt(2) Irms = 1.414 Irms

physics
The rms output in a circuit is 7.75 A. What is the maximum current?

Math
time on bus = (5/60)hr = (5/60)(60) = 5 minutes so he walked for 20 inutes 20 minutes (1 hour/60 min) = (1/3)hr 2 km/(1/3)hr = 6 km/hr

Math
Yumi walked 2 km to a bus stop to catch the bust to school. The bus arrived straight away and averaged 60km/h for the 5km trip. Yumi's total travelling time was 25 minutes. at what average speed did Yumi walk to the bus stop? The answer is 6, but the only thing I could ...

Physics
An electron moves to the left with a velocity of 3.2 x 10^5 m/s and has a magnetic force of 5.6 x 10^-17 N exerted on it. What is the magnitude of the magnitude field? Assume the charge has a value of 1.60 x 10^-19 C.

Social Studies
How do nearby businesses with similar products usually compete? (1 point) A. offering deals and low prices B. changing to different product types C. lowering the level of service to save costs D. establishing a minimum price for everyone to use

geometry
Lateral area does not include the base, so we want the total area of just the four triangles that make up the other faces. These triangles are isosceles and congruent to one another, since this square pyramid is regular. Draw one of these isosceles triangles and label it with ...

algebra
Let n be the number of nickels. Let q be the number of quarters. n + q = 34 0.05n + 0.25q = 3.90 Solve the above system of equations for n and q.

Chemistry
9.54 for this one?

Chemistry
The resulting pH of a solution when 100 mL of 0.877 M NH3 is mixed with 100 mL of 0.481 M HBr is ___. For NH3, Kb = 1.8 × 10?5.

Chemistry
Does 4.7 sound correct?

Chemistry
A solution that is prepared by mixing 20.0 mL of 0.32 M HC2H3O2 with 20.0 mL of 0.36 M NaC2H3O2 would have a pH of ___. For HC2H3O2, Ka = 1.8 x 10-5.

Social Studies
I NEED HELP QUICK!!!! what effect did John Hay's open door policy letters have on the imperial powers of Britain France Germany Russia and Japan? 1. it provoked the imperial powers to declare war on the United States. 2. it caused the imperial powers to restrict trade in ...

Social Studies
what effect did John Hay's open door policy letters have on the inperial powers of Britain France Germany Russia and Japan?

language arts
Can someone help me with unit 3 lesson 19 different perspective test plz

Math
Im sorry for bombarding you guys with questions. I've only needed help with 3 of 40 so far.. Anyways, moving on! 3! = 3 * 2 * 1 4! = 4 * 3 * 2 * 1 5! = 5 * 4 * 3 * 2 * 1 30! = 2^x * N where N is odd. What is the value of x? I have no idea where to start, but reading the ...

Math
1/3 * 2/4 * 3/5 * 4/6 * 5/7 *... ... ... * 98/100 = ? Is there a specific way on how to calculate this?

La
1. B

Math
Yeah, my bad. Thanks a lot!

Math
Dedi has a rectangular pool in his backyard. The surface area of the pool in 30m^2 and the width is 5m. There are 4 lights, equally spaced along each of the longer sides of the pool, including a light at each corner. What is the shortest distance between two lights? I tried ...

english
A successful academic argument depends upon

Math
Is it #1

math
Verify: tan^2a=cot^2a-cot^2acsc^2a

Math
Verify: tan^2a=sec^2a tan^2a-1

Statistics
50 apples from an orchard are randomly selected. A mean apple diameter of 2.22 inches is calculated with a margin of error for a 95% confidence interval of ±0.13. What is the interval estimate of the population mean? 1.99 < ? < 2.23 2.09 < ? < 2.35 2.09 <...

Calculus
A particle's position along the x-axis is given by x(t) = t^4/24 - t^3/2 + 2t^2 - 1. What is the maximum acceleration on the interval 0 <= t <= 4? I found the acceleration to be (t^2 - 6t + 8)/2 and the derivative of the acceleration to be t - 3. I thought the ...

Calculus
A differentiable function called f(x) achieves its maximum when x=0. Which of the following must then be true? 1. The function p(x) = xf(x) has a critical point when x = 0. 2. The function m(x) = (f(x))^2 has its maximum at x = 0. 3. The function j(x) = f(x^2) has its maximum ...

Algebra 2
I'm so sorry!! I actaully meant f(x)=2sin(x/2)-1

Algebra 2
What effect does changing the function f(x)=2sin(x2)?1 to the function g(x)=2sin(x)?5 have on the graph of f(x)? The graph is stretched vertically by a factor of 2 and shifted right 4 units . The graph is compressed vertically by a factor of 2 and shifted left 4 units . The ...

EXAM TOMORROW
Building new,stable houses and shops

Math
Divide (-6m^9 - 6m^8-16m^6) / 2m^3 I get -3m^12 -3m^11 - 8M^9 NOT A CHOICE ON PAPER could it be -3m^9 -3m^8 -8m^6

physics
the half life of radium is 1600 years of 100 grams of radium existing now 25 grams will remain after how many years

Math
950,000*.10 = 95,000 950,000-95,000 = 855,000 (1yr) 855,000*.10 = 85,500 855,000-85,500 = 769,500 (2yr) Repeat the process until reach 5 yrs.

social
How did social controls shape Japanese identity and citizenship?

Geometry
Find the area. The figure is not drawn to scale. 6.9 4cm

Macroeconomics - Please help
How does the aggregate expenditure multiplier change given a decrease in marginal propensity to import and marginal propensity to consume?

Economics
Explain how each will impact the size of autonomous expenditure multiplier, other variables constant. (a) Decrease in marginal propensity to consume (b) Decrease in marginal propensity to import

Chemistry
A copper electrode weighs 35.42 g before the electrolysis of a CuSO4(aq) solution and weighs 36.69 g after the electrolysis has run for 20.0 min. What was the amperage (Amps) of the current used? this is the equation that i used is it correct (1.27g Cu x 1 mol Cu x 2 mol e- x ...

geometetry
Given: KLMN is a trapezoid, m?K = 90°, LM = 9, KN = 18, MN = 15 Find: Area of KLMN LM and KN are parallel

statistics
Suppose that diastolic blood pressure readings of adult males have a bell-shaped distribution with a mean of 84 84 mmHg and a standard deviation of 9 9 mmHg. Using the empirical rule, what percentage of adult males have diastolic blood pressure readings that are greater than ...

Geometry
Given: KLMN is a trapezoid, KL = MN, m?LKM=m?MKN, LM:KN = 8:9 , Perimeter KLMN = 132 LM and KN are parallel Find: The length of the legs. I reposted this question because the last time was not vary clear, and I got 49 but it is wrong

Music
What is the note called that has 4 beats?

geometry
P stands for the perimeter, and LM and KN are parallel. angle one is LKM and angle 2 is MKN

geometry
Given: KLMN is a trapezoid, KL = MN, m?1=m?2, LM:KN = 8:9 , PKLMN = 132 Find: The length of the legs. I got 49, but it was wrong

bio
salt does it have more free enrgy when dissolved in water

Work
i am primarily cream in color but speckled in grey. round is not my shape, nor is square. i am a loner in my environment. if i could speak, the stories i would tell.

English
What two word are the most opposite in meaning hanker grovel hurtle and patronize

Chemistry
A system has an initial energy of 117 joules. The energy equation includes --40.1 J of heat and -20.3 J of work. What is the final energy? Was heat added to the system or to the environment? Was work done by the system or to the system? Be sure to show all of your work and ...

Somerset Academy
80% of an airline's flights depart on-time and 20% do not. Of those that depart on-time, 95% arrive on-time. OF those that depart late, 10% arrive on-time. What is the chance of someone taking a flight that will arrive on-time?

math
Mrs. Davis planted red flowers in 0.6 of her garden. She also planted yellow flowers in 0.4 of her garden. In 0.5 of the part with red flowers she also planted white flowers. What part of Mrs. Davis' garden has both red and white flowers?

algbra
Solve the inequality ?4y + 6 < ?14. A. y > 2 B. y ? 5 C. y > 5 D. y < 5

MATH
Convert r^2=3/(tanx) into cartesian form. I got this so far: r^2=3/(tanx) x^2+y^2=3x/y What do I DO NEXT????

Chemistry
Give the formal charge on the sulfur atom in a Lewis structure for the sulfate ion in which every atom satisfies the octet rule. Based off my lewis structure, I think the formal charge of the the sulfur atom would be +2. Is that correct?

English
the story of disabled athletes who became well known

Maths
Given that the line y=mx+c is a tangent to the circle (x-a)^2+(y-b)^2 = r^2 show that: (1-m^2)r^2=(c-b+ma)^2

Math
Thank You!! This really helped me!!

Math
Algebra 1 Simplify the radical _____ 5_/700 I'm confused on what to do with the 5...

Maths
show that the circles x^2 + y^2 - 10x - 8y + 18 = 0 and x^2 + y^2 - 8y - 4y + 14 = 0 do not intersect

Algebra
Explain how to use the measures of a right triangle to calculate the exact value of sin 30 degrees? How can this information be used to determine the exact value of sin 60 degrees?

maths
show that the circles x^2 + y^2 - 10x - 8y + 18 = 0 and x^2 + y^2 - 8y - 4y +14x = 0 do not intersect

Social Studies
Thank you :)

Social Studies
Which country today has the largest muslim population. A. Iraq B. Indonesia C. Iran D. the United states

math
A cable channel survey showed that about 50% of subscribers preferred watching a comedy to an action movie on Saturday nights. If you want to estimate the probability that exactly two of three randomly picked subscribers prefer watching an action movie on a Saturday night, how...

Psychology
I am curious as to how someone who distributes a personality test would be able to decipher who is and who is not telling the truth on the test? If the test is straightforward such as "are you a liar?" obviously that is not desirable and people could just answer '...

social studies
yes

social studies
Is Plato now of the teachers of Hippocrates (the Father of medicine)

Math
18.125

Math
A baby weight 7.25 at birth at the end of a eight months the baby weight 2 and a half times its birth weight how many pounds did the baby weight at the end of eight months

math
what's the solution for y=2x-1 and y=x+3

MAth
3a +4/4a+4 x a^2 - 6a -7 Asking for the product so confused

accounting
The following information was available as of the close of business June 1, 2004 on government of Canada bonds. Coupon...Maturity.....Price.....Yield 5.00%......June 1, 2005......102.35......2.60 10.50%......June 1, 2006......113.91......3.26 8.50%......June 1, 2007.....107.41...

Physics
What does it mean when the position vs. time graph is below the x-axis?

science
PLEASE HELP!

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