Wednesday
March 29, 2017

# 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?
March 29, 2017

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 ...
March 25, 2017

Physics - Calculating work required
Alrighty, thank you!
February 16, 2017

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" ...
February 16, 2017

math
If you're solving for percentage: 75% of 80 = 60
February 15, 2017

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 ...
February 15, 2017

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...
February 15, 2017

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 ...
November 28, 2016

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?
November 24, 2016

Math - Antiderivatives/Integrals
Find the function with derivative f?(x)=e^(9x) that passes through the point P=(0,4/9).
November 24, 2016

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).
August 24, 2016

math
what is 843,208,732,833?
August 15, 2016

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.
April 29, 2016

Physics
But my final answer is correct?
April 28, 2016

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 ...
April 28, 2016

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.
April 28, 2016

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...
April 27, 2016

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.
April 27, 2016

Math
-24x-54 is the simplified answer of that expression.
April 27, 2016

Math
For the work shown above, 4/32 was reduced to 1/8, NOT 4/34
April 27, 2016

Math
2^2/2^5 = 4/34 = 1/8 The answer is C) 1/8
April 27, 2016

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.
April 2, 2016

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
April 2, 2016

Geography
d is correct
April 2, 2016

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 ...
April 2, 2016

April 2, 2016

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 ...
April 2, 2016

math plz its urgent
I think B is also correct.
March 16, 2016

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 ...
March 14, 2016

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 ...
March 14, 2016

Trigonometric Identities
Verify/prove that: (cotA+cotB)/(tanA+tanB)+(1-cotAcotB)/(1-tanAtanB) = 0
March 14, 2016

Trigonometric Identities
Verify/prove that: sinAcosA/1-cosA = sin^2/tanA-sinA
March 14, 2016

Math
Write base-ten number for five hundred seventy-two
March 2, 2016

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.
February 15, 2016

geometry
thanks
January 15, 2016

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?
January 15, 2016

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?
January 15, 2016

Algebra
(2,-9)(3,2) and (3,-9) find the area of the triangle
January 13, 2016

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)
January 4, 2016

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?
January 4, 2016

Trigonometry
Find (sinϴ + cosϴ) if the terminal side of ϴ passes through (5,2)
December 9, 2015

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...
November 25, 2015

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 ...
November 25, 2015

Math - Logarithms
Could you please explain why lne^2 = 2, e^lne^2 = e^2, e^lin2 = 2, and lne^e = e ? Thank you.
November 13, 2015

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, ...
November 13, 2015

Chemistry - Energy: Phase Changes
Thank you. Is there an official formula for what you came up with or some sort of rearranged formula?
November 12, 2015

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 ...
November 12, 2015

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...
November 12, 2015

Algebra 1
You're welcome
November 7, 2015

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
November 7, 2015

Math
The answers to questions 1, 2, 3, 6, 7, 8 are most likely correct.
November 7, 2015

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.
November 6, 2015

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 &...
November 6, 2015

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...
November 6, 2015

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
November 3, 2015

Heating different volumes of water
The amount of thermal energy, the number of water particles, or the speed of the particles
November 3, 2015

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?
November 3, 2015

French Expressions
Does anybody know what the following French expression means: "Je changeais de plan de carrière comme on change de sous-vêtements."
November 1, 2015

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...
October 30, 2015

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.
October 30, 2015

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?
October 30, 2015

Technolgy
C b a d just got a 100% on the quick check
September 29, 2015

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...
February 9, 2015

Math.
i don't believe those are right...
January 28, 2015

Help ? English 10
protesting injustice
November 18, 2014

Math
required*** Test please excuse my grammar error.
September 19, 2014

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...
September 19, 2014

Biology
Nucleotide
July 27, 2014

math
What is the answer bruh..... You can't just leave a question without a freaking answer dudes
May 23, 2014

SCIENCE HELP!
Me is right! Thanks!
April 24, 2014

Chemistry
I wish I knew
March 14, 2014

english
Help us
October 23, 2013

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.
January 14, 2013

social studies
Which of the following is not a response to the Stamp Act?
December 4, 2012

algebra
12 + 24 (10 - 4) (9 - 7) - 17
October 24, 2012

Chemistry
what is the mass in grams of 1.32 x 10^20 uranium atoms
October 16, 2012

This is actually 8th grade math btw and answers 1. C 2. B 3. A 4. D 5. C 5/5 100%
September 26, 2012

Math
^^Kelly is correct: 1. D 2. A 3. C 4. B
September 13, 2012

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?
May 31, 2012

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)
February 11, 2012

english
February 10, 2012

Science
A wave geneerantor produces 16.0 pulses in 4.00s . What is the frequence ?
November 6, 2011

math
STUFU
March 30, 2011

Math
I got 93
September 22, 2010

alg
88,872
July 12, 2010

alg
ms sue i got 8400
July 12, 2010

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.
July 12, 2010

alg
thanks
July 12, 2010

alg
thanks sue but that 5 and 19 are both prime number
July 12, 2010

alg
which of the following are prime number? a) 5 b) 19 c) 33 d) 49
July 12, 2010

alg
THANKS
July 12, 2010

alg
4.00
July 12, 2010

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
July 12, 2010

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
May 2, 2010

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
May 1, 2010

algebra
solve the following system of equations. 5x + y = -9 -5x + 2y = 0
April 29, 2010

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