# Posts by kid

Total # Posts: 107

Physics - Capacitance
In the case of having two plates of a capacitor, in the formula for capacitance C = (Epsilon)(A/d), is A the sum of the areas of each plate or just the area of one plate? And if it is the latter, then it can be assumed that both plates have the same area, right?

Physics - Voltage across a wire of unknown length
Four copper wires of equal length L are connected to a 100V source. Their cross-sectional area are 1cm^2, 2cm^2, 3cm^2, and 4cm^2. Find the voltage across the 3cm^2 wire. Leave your answer in terms of L, it should cancel out. - So I tried using and equating various relevant ...

Physics - Calculating work required
Alrighty, thank you!

Physics - Calculating work required
Two equipotential surfaces are shown. If Va = -5V and Vb = -15V, find the work needed to move a -2?C charge from A to B along the indicated path. - First of all, does the path of the charge going from A to B matter or can I just calculate using the "distance" ...

math
If you're solving for percentage: 75% of 80 = 60

Physics - Electric force, field, and potential
A 2?C charge is positioned at x = -0.8m and another 2?C charge is positioned at x = 0.8m. A positive test charge of q = 1.28*10^-18C is positioned at the origin x = 0m. Find (a) the electric force exerted on q, (b) the electric field at the origin, and (c) the electric ...

Physics - Potential Difference
An electron moving in the + x-direction has an initial speed of 3.7*10^6 m/s at the origin. Its speed is reduced to 1.4*10^5 m/s at x = 2cm. Calculate the potential difference between the origin and that point. Which point is at the higher potential? My work and calculations...

Physics - Collisions
A big toy school bus rear-ends a small toy school bus initially at rest. The bigger bus is several times heavier than the smaller one. Which of the following statements are true if the collision is totally inelastic? 1. The big bus exerts the same amount of force on the small ...

Calculus - Optimization
A Norman window has the shape of a semicircle atop a rectangle so that the diameter of the semicircle is equal to the width of the rectangle. What is the area of the largest possible Norman window with a perimeter of 38 feet?

Math - Antiderivatives/Integrals
Find the function with derivative f?(x)=e^(9x) that passes through the point P=(0,4/9).

Math - Composition of Functions
Express the function f(x) = 1/x+1 in the form goh. If h(x) = x+1, find the function g(x).

math
what is 843,208,732,833?

Math
Total balloons = 12 Let x = # of green balloons 12 = 5+3+x 12 = 8+x x= 4 # of green balloons/total balloons = 4/12 = 1/3 1/3 of the balloons are green.

Physics
But my final answer is correct?

Physics
NASA wants to build a centrifuge to train its astronauts to handle the strong accelerations they will experience when the space shuttle lifts off. A composite material capable of withstanding a normal force of 120000N without rupturing is used to manufacture the base of the ...

Science
Because different mediums have different indexes of refraction. Therefore, when you use Snell's Law: (n1)(sinΘi) = (n2)(sinΘr), depending on the index of refraction of both mediums, the angle of refraction will be different.

Physics
What is the maximum mass of a rubber block that can be pulled by a rope whose maximum tension is 3500N? The block is sitting on dry asphalt. (By the way, 1.2 would be used as the coefficient of static friction and 0.8 is the coefficient of kinetic friction for rubber substance...

Math
The "-" is from the 6. Because -6(4x+9) is basically (-6)(4x)+(-6)(9) = (-24x)+(-54) = -24x-54. If you are adding a negative value, you are basically subtracting that value.

Math
-24x-54 is the simplified answer of that expression.

Math
For the work shown above, 4/32 was reduced to 1/8, NOT 4/34

Math
2^2/2^5 = 4/34 = 1/8 The answer is C) 1/8

Geography
B is correct. NAFTA, ECOWAS, APEC, and MERCOSUR all have to do with money and trade. However, as you most likely know, ISIS is a militant group.

math
does the \$1450 represent how much interest, or how much money he ended up with in total (including the original amount)? If you mean that \$1450 is the interest, then just plug the numbers into the simple interest formula I = PRT

Geography
d is correct

If one square has a length of 2 feet, then 3 squares in a row is 6 feet long. This means the fountain is 6 feet long. Since its a square, the height is the same as the length. The fountain is 6 feet by 6 feet. Area = Length x Height A = 6 x 6 A = 36 feet squared The answer ...

Math
You need to use a system of equations. Lets say that N equals the number of nickels, and D is the number of dimes. D = 5 x N because there are 5 times as many dimes as nickels .05N + .1D = 57.75 the .05 and .1 represent the value of the coins (N is 5 cents, D is 10) Well, you ...

math plz its urgent
I think B is also correct.

Trigonometric Identities
Verify/prove the following: (sinA+tanA)/(1+secA) = sinA ______________________________ tanu = 1+sinu-cos^2u/cosu(1+sinu) __________________________________ cotu = (2+cscu/secu)-2cosu ______________________________ tanAsinA/tanA+sinA = tanA-sinA/tanAsinA ...

Trigonometric Identities
I'm sorry, I just still don't understand exactly how you even got tan(A+B) = (tanA+tanB)/(1-tanAtanB). What happened to the cotA+cotB, 1-cotAcotB, and 0? If you simplified the original identity, then how did you do that? Because what I did was expand the cot and tan ...

Trigonometric Identities
Verify/prove that: (cotA+cotB)/(tanA+tanB)+(1-cotAcotB)/(1-tanAtanB) = 0

Trigonometric Identities
Verify/prove that: sinAcosA/1-cosA = sin^2/tanA-sinA

Math
Write base-ten number for five hundred seventy-two

math-story prob
Let x = number of ultra tickets and y = number of deluxe tickets x + y = 89 3x + 2y = 235 -> -3(x + y = 89) = -3x + -3y = -267 -3x + -3y = -267 + 3x + 2y = 235 ____________________ -y = -32 y = 32 x + y = 89 x + 32 = 89 x = 57 Quinn sold 57 Ultra tickets and 32 deluxe tickets.

geometry
thanks

geometry
I messed up the question. Mai is ordering an ice cream dessert. She must order a size, a flavor of ice cream, and a topping. There are 5 sizes, 1 flavor, and 2 toppings to choose from. How many different ice cream desserts could she order?

geometry
ma is ordering an ice cream dessert. She must order a size, a flavor of ice cream, and a topping. There are sizes, flavor, and toppings to choose from. How many different ice cream desserts could she order?

Algebra
(2,-9)(3,2) and (3,-9) find the area of the triangle

Algebra
Find the equation in slope intercept form. For the line which is perpendicular to this line 4x + 4y = 3y - 3 and passes through the point (1,-2)

Algebra
Two trucks leave a warehouse at the same time. One travels due north at an average speed of 58 miles per hour, and the other travels due south at an average speed of 48 miles per hour. After how many hours will the two trucks be 424 miles apart?

Trigonometry
Find (sinϴ + cosϴ) if the terminal side of ϴ passes through (5,2)

Heat and Heat Transfer
Two calorimeters each contain 1.4L of water and have a temperature of 26°C In the first calorimeter, you burn a sample of candle wax and determine that 108.2kJ of energy is released. In the second calorimeter, you have to burn 5.4g of candle wax to raise the temperature of...

Chemistry - Energy Phase Changes
Calculate the quantity of heat gained or lost in the following change: 0.44 mol of water evaporates at 100 degrees Celsius - So what I did was: 1 mol -> 6.01 kJ 0.44 mol -> x x = 2.64 kJ of energy gained But apparently this is incorrect? Could somebody please explain to ...

Math - Logarithms
Could you please explain why lne^2 = 2, e^lne^2 = e^2, e^lin2 = 2, and lne^e = e ? Thank you.

Math - Logarithms
Write the following expression as a single logarithm: 4ln2x + ln(6/x) - 2ln2x So I did... 4ln2x + ln(6/x) - 2ln2x = ln2x^4 + ln(6/x) - ln2x^2 = ln16x^4 + ln(6/x) - ln4x^2 = ln16x^(2)(2) + ln(6/x) - ln4x^2 = 2ln16x^2 + ln6 - lnx - ln4x^2 If my calculations so far are correct, ...

Chemistry - Energy: Phase Changes
Thank you. Is there an official formula for what you came up with or some sort of rearranged formula?

Chemistry - Energy: Phase Changes
An ice cube at 0 degrees Celsius is placed in a pouch and dropped into 30.0g of water in a cup at 45 degrees Celsius. The ice cube melts and the resulting water warms up. The lowest temperature reached by the 30.0g of water in the cup was 20.0 degrees Celsius. What was the ...

Chemistry - Energy: Phase Changes
If 13.4 kJ of energy are added to 1.00 kg of ice at 0 degrees Celsius, how much water at 0 degrees Celsius is produced? How much ice is left? The molar heat of melting is 6.01 kJ/mol. So... 6.01 kJ -> 1 mol (6.01 kJ of energy can melt 1 mole of ice) Then... 13.4 kJ -> x...

Algebra 1
You're welcome

Algebra 1
I think it's actually c, since: y = 1.375x = 1.375(8) = 11 y = 1.375(16) = 22 y = 1.375(24) = 33

Math
The answers to questions 1, 2, 3, 6, 7, 8 are most likely correct.

Logarithmic Function
No, wait, actually the 2 does not apply to the 2log_2 by itself. Rather, the "2(x+2)" applies to the log. I was so confused, sorry. So I'm going to assume that the answer "2" is correct and the "4" on my answer sheet is incorrect.

Logarithmic Function
Thank you. I actaully just figured out that I indeed had miscalculated the equation. It was: y = 2log_2(2) (x+2)-4 Therefore I should solve the "log" part first: 1) y = 2log_2(2) (2+2)-4 2) y = 2 (2+2)-4 3) y = 2 (4)-4 4) y = 8-4 5) y = 4 In other words, the number &...

Logarithmic Function
Could you please verify and calculate the following logarithmic equation: y = 2log_2(2)(x+2)-4 , in which x=2. So the equation would become: y = 2log_2(2)(2+2)-4 Solving... y = 2log_2(2)(4)-4 y = 2log_2(8)-4 y = 2(3)-4 y = 6-4 y = 2 So I got y=2, however my answer sheet and my...

Math
Use the distance formula, along with the given points: d= √(x2-x1)^2+(y2-y1)^2 d= √(-1+3)^2+(1-2)^2 d= √5

Heating different volumes of water
The amount of thermal energy, the number of water particles, or the speed of the particles

Heating different volumes of water
Is there a difference between heating 50 mL of water to a given temperature, and heating 100 mL of water to the same given temperature but then removing 50 mL?

French Expressions
Does anybody know what the following French expression means: "Je changeais de plan de carrière comme on change de sous-vêtements."

Physics
Two light rays, one red and one violet, encounter a glass surface. If the index of refraction of the red light ray = 1.52, the index of refraction of the violet light ray = 1.54, and the angle of incidence = 30 degrees, calculate the angle of refraction of each colour of light...

Physics
If a scuba diver is underwater and looks up, he or she will see a round "hole" directly above him or her at the surface of the water. The rest of the surface will look like a mirror. Explain this phenomenon.

Physics
Does total internal reflection in an aquarium occur at the separation of the water and the glass or at the boundary of the glass and the water?

Technolgy
C b a d just got a 100% on the quick check

science
1) The force of gravity on the moon is 1/6 the force of gravity on earth. If you had a 1 kg box of cereal on earth which had a weight of 2.4 N, what would its mass be on the moon? why? 2) what is the volume of a textbook with dimensions 21.3 cm, 27.5 cm, 2.9 cm? please help me...

Math.
i don't believe those are right...

social studies
asbdd

Help ? English 10
protesting injustice

Math
required*** Test please excuse my grammar error.

Math
Check answer PLEASE!! Kevin wants to calculate the value of the expression below. -17 + 3 Which shows an equivalent way kevin could write this expression? (A.) -(17 + 3) B. -(17 - 3) C. (-3 + 17) D. (-3 - 17) Please help as soon as possible!! I have no one to help me and i don...

Biology
Nucleotide

math
What is the answer bruh..... You can't just leave a question without a freaking answer dudes

SCIENCE HELP!
Me is right! Thanks!

Law
yes

Chemistry
I wish I knew

english
Why

english
Help us

english
Umm..

chemistry
Calculate the molarity of each ion in 0.500 M (NH4)3PO4. Enter a zero for an ion that doesn't occur in the compound.

social studies
Which of the following is not a response to the Stamp Act?

algebra
12 + 24 (10 - 4) (9 - 7) - 17

Chemistry
what is the mass in grams of 1.32 x 10^20 uranium atoms

This is actually 8th grade math btw and answers 1. C 2. B 3. A 4. D 5. C 5/5 100%

Math
^^Kelly is correct: 1. D 2. A 3. C 4. B

pre-calculus
If San Francisco Giants homerun king, Barry Bonds, hit a baseball due west with a speed of 50.0 m/s, and the ball encountered a wind that blew it north at 5.00 m/s, what was the resultant velocity of the baseball?

Trigonometry
Given log 3= x and log 5 =y Express radical 3/5 in terms of x and y. 1) 1/2x-y 2) 1/2(x-y) 3) 1/2xy 4) 2(x-y)

english

Science
A wave geneerantor produces 16.0 pulses in 4.00s . What is the frequence ?

math
STUFU

Math
I got 93

alg
88,872

alg
ms sue i got 8400

alg
ken griffy jr hit 23 home runs in the first 50 games of the season. If he hit homw runs at this pace all season, how many would he have at the end of the year? aSSUME A 168 games schedule. Round your answer to the nearest whole number of home runs.

alg
thanks

alg
thanks sue but that 5 and 19 are both prime number

alg
which of the following are prime number? a) 5 b) 19 c) 33 d) 49

alg
THANKS

alg
4.00

alg
Sue bought a dress on sale fro \$21.50. If the sale was a 15% off sale, how much money did she save compared to if she bought at the regualr price? round you saving the nearest cent

algebra
what is the solution of the following linear system? -4x - y = 5 -12x - 3y = 15 a) (-2,1) b) none c) (3,-2) d) infinite number of solutions

algebra
what is the solution of the following linear system? -4x - y = 5 -12x - 3y = 15 a) (-2,1) b) none c) (3,-2) d) infinite number of solutions

algebra
solve the following system of equations. 5x + y = -9 -5x + 2y = 0

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