Thursday
November 27, 2014

Posts by Liz


Total # Posts: 1,182

Energy multiple choice question
Which of the following samples has the highest specific heat capacity? a) A 100 kg sample of lead requires 13 000 J to increase its temperature by 1 K b) A 50 g sample of water releases 1050 J as it cools by 5 degree Celsius c) A 2 kg sample of copper receives 2340 J of ...
April 12, 2014

Physics Energy
How would a $10.00 compact fluorescent light bulb (15 W) be an overall money saver compared to an incandescent light bulb (60 W) that costs $0.50?
April 11, 2014

physics
Show that the acceleration is 7.5 m/s2 for a ball that starts from rest and rolls down a ramp and gains a speed of 30 m/s in 4 s
April 9, 2014

chemistry
Sodium metal adopts a body-centered cubic structure with a density of 0.97g/cm3. A. Use this information and Avogadro's number to estimate the atomic radius of sodium. B. If it didn't react so vigorously, sodium could float on water. Use the answer from part a to ...
April 3, 2014

english
May you please edit this essay? Holden Caulfield in “Catcher in the Rye”, seems to be obsessed with mortality and youthful innocence, both of which are embodied in James Castle and Allie Caulfield. Holden demonstrates these infatuations in his conversation with ...
March 10, 2014

chemistry
how to calculate the amount of heat in calories absorbed when 50.0 g of water at 20 degrees C spreads over your skin and warms the body temperature, 37 degrees C
March 1, 2014

Physics
A ball is fastened to one end of a 30cm string, and the other end is held fixed to a support. the ball whirls in a horizontal circle. Find the speed of the ball in its circular path if the string makes an angle of 30 degrees to the vertical.
February 27, 2014

chemistry
A room contains 48 kg of air. How many KWh of energy are necessary to heat the air in the house from 7oC to 28oC? The heat capacity of air is 1.03 J/goC
February 22, 2014

Differential Equations
Solve dy/dx = y/(2y-x) using rational substitution (using v=y/x) with the initial condition y(0)=1. I solved this problem and found C (the constant) to be undefined. That is not the correct answer.
February 15, 2014

Physics
Ohhh I see what I did wrong! Thanks a lot again!
February 3, 2014

Physics
I was wondering if my answers are correct. 1. A 50kg person is taking a ride on an elevator travelling up at a steady speed of 2.5m/s. Find the time fo the elevator trip if the elevator does 4900 J of work on the person. My answer: First I used the formula f=mg to find the ...
February 3, 2014

Physics
thanks a lot!
February 3, 2014

Physics
I was wondering if my answers are correct. Thanks in advance. 1. A boy pushes down on a car rolling horizontally down the road. The boy pushes down vertically with 10N of force as the car rolls 3.0m horizontally. What work is done? my answer: 30 N•m (or would it be -30N&#...
February 3, 2014

Linear Algebra!
Write in parametric form the equation of the line that is perpendicular to r=(2i + 4j) + (i - 2j)t and goes through (1,0)
January 29, 2014

Calculus
write and row reduce the augmented matrix to find the general solution: 2x - z = 2 6x + 5y + 3z = 7 2x - y = 4
January 26, 2014

Calculus
write and row reduce the augmented matrix to find the general solution: x - 2y + 13 = 0 y - 4x = 17
January 26, 2014

math-advanced functions
on my exam review, i have this question for composition of functions Given f(x)=3x^2+x-1, g(x)=2cos(x), determine the values of x when f(g(x))=1 for 0≤x≤2π.
January 23, 2014

Algebra
Determine the equation of g(x) that results from translating the function g(x)f(x)=x^2 +3 upward 10 units 1) g(x)=(x+13)^2 2) g(x)= (x+15)^2 3) g(x)= (x+4)^2 -11 4) g(x)= (x+4)^2 +11
December 23, 2013

Math. I really don't get this question
three circles are manually tangent externally. their centers form a triangle whose sides are of length 8, 9, 13. find the total area of the three circles
December 10, 2013

Fundamental Theorm of Calculus
Find the average value of f(x)=3x^2-2 x on the interval [3,6]
November 20, 2013

Fundamental Theorm of Calculus
Use a definite integral to find area of the region under the curve y=7-4x^2 and above the x-axis. Thanks in advance!
November 20, 2013

Physics
A test tube in a centrifuge is pivoted so that it swings out horizontally as the machine builds up speed. If the bottom of the tube is 165.0 mm from the central spin axis, and if the machine hits 53500 rev/min, what would be the centripetal force exerted on a giant amoeba of ...
November 11, 2013

physics
A bicyclist traveling at 8 m/s rides around an unbanked curve. The coefficient of friction (is this static or kinetic friction?) between the tires and the road is 0.42. What is the radius of the shortest turn that the bicyclist can safely make?
November 11, 2013

Math
3x^2
November 11, 2013

Math
what is the solution of 3x^+27=0
November 11, 2013

pre-calc
prove or disprove cos(x-y)=cos(x)-cos(y)
November 8, 2013

Math
You place a mirror on the ground 6 feet from the lamppost. you move back 3 feet and see the top of the lamppost in the mirror. What is the height of the lamppost?
November 7, 2013

American Government
Legislation whose tangible benefits are targeted solely at a particular legislator's
November 7, 2013

Calculus-Aproximate Areas
Estimate the area under the graph of f(x)=sin(pix) from x=0 to x=1 using the areas of 3 rectangles of equal width, with heights of the rectangles determined by the height of the curve a a) left endpoint: b) right endpoint:
November 4, 2013

Calculus-Aproximate Areas
I tried that, and it was incorrect
November 4, 2013

Calculus-Aproximate Areas
Estimate the area under the graph of f(x)=sin(pix) from x=0 to x=1 using the areas of 3 rectangles of equal width, with heights of the rectangles determined by the height of the curve at a) left endpoint: b) right endpoint:
November 4, 2013

Calculus-Approximate areas
Estimate the area under the graph of f(x)= x^2 + 3 x from x=1 to x=10 using the areas of 3 rectangles of equal width, with heights of the rectangles determined by the height of the curve at a) left endpoints: b) right endpoints:
November 4, 2013

Calculus-Newton Method Approximation
Use Newton's method to approximate the positive value of x which satisfies x=2.3cosx Let x0=1 be the initial approximation. Find the next two approximations, x_1 and x2, to four decimal places each.
November 1, 2013

Calculus-Applied Optimization Problem
The manager of a large apartment complex knows from experience that 100 units will be occupied if the rent is 425 dollars per month. A market survey suggests that, on average, one additional unit will remain vacant for each 9 dollar increase in rent. Similarly, one additional ...
October 31, 2013

Math
How do I work out:if life expectancy of male is 78.9 and female is 83.6. Life expectancy is % lower than female. What is formula please
October 30, 2013

Physics
A research balloon of total mass 225 kg is descending vertically with a downward acceleration of 1.4 m/s2. How much ballast must be thrown from the car to give the balloon an upward acceleration equal to 3.6 m/s2, presuming that the upward lift of the balloon does not change.
October 24, 2013

calculus
relative maxima and relative minima 2x^2+ 4000/x +10
October 13, 2013

cinquain poem
thanks for your help and advice
October 8, 2013

cinquain poem
For social studies we had to make our own 4 topic of cinquain poems. I asked some people and not many knew this type of poem, but one person said it all seem good except for the last lines. Do you think I did the format corret? Thanks for your help 1.Homesteaders Brave, ...
October 8, 2013

Math
-10 + 6g = 110
October 2, 2013

math
I have fewer ones than tens. the value of my tens is 20 what two numbers can I be
September 10, 2013

Physics
In a vacuum, two particles have charges of q1 and q2, where q1 = +3.8C. They are separated by a distance of 0.37 m, and particle 1 experiences an attractive force of 4.7 N. What is the value of q2, with its sign? Two spherical objects are separated by a distance of 1.45 ×...
August 26, 2013

cerritos
political culture refers to
July 23, 2013

Calculus 2
A tank is full of water. Find the work W required to pump the water out of the spout. (Use 9.8 for g and 3.14 for π. If you enter your answer in scientific notation, round the decimal value to two decimal places. Use equivalent rounding if you do not enter your answer in ...
June 22, 2013

Calculus 2
Use the method of cylindrical shells to find the volume V generated by rotating the region bounded by the given curves about x = 4. y = 3 x^4 y = 0 x = 2
June 21, 2013

Franklin High
4x - y = 2, 9x - 2y = 8 find solution by substitution method
June 12, 2013

Calculus help!
Does the limit of xy/(x^2 + y^2) exist as (x,y)--->(0,0)? Why or why not??
June 1, 2013

Calculus help!
Three forces with magnitudes 75 pound, 100 lb, and 125 pound act on an object at angles of 30 degrees, -45 degrees, and 120 degrees respectively. Find the direction and magnitude of the resultant vector.
May 14, 2013

Calculus
Describe the surface and give traces: x = y^2 - 4z^2
May 14, 2013

Calculus-PLZ help!
Given u=3i-2j+k,v=2i-4j-3k, w=-i+2j+2k, 1 Find a unit vector normal to the plane containing v and w. 2 Find the volume of the parallelepiped formed by u, v, and w. 3 Are any of these vectors parallel? Orthogonal? Why or why not?
May 13, 2013

Find the center (h,k) and radius
Find the center (h,k) and radius r of the circle and then use these to (a) graph the circle and (b) find the intercepts, if any. 3x^2+36x+3y^2=0
May 13, 2013

Calculus
Describe the following surface and give traces if available. x^(2)-4z^(2)=4
May 10, 2013

Statistics
You have a ten question multiple choice test in your next class and you did not study at all. Each question has four choices and only one correct answer. You are going to guess on each question. What is the probability that you score at least a 20% on the test.
May 7, 2013

math
245 = .25x not sure how to do this since I have only learned with ratios
May 1, 2013

Chemistry II
Arrange the following 0.10M solutions in order of increasing pH: a. Nacl b. NH4CL C. HCL D. NaCH3CO2 e. KOH
April 30, 2013

College chemistry
The pH of blood is 7.4 and that of saliva is 6.4. what is the difference in pH between these two solutions? How much more Hydronium ion (H3O+) is in the saliva than in the blood. I need a detailed answer with the formulas if you can. I have a hard time with chemestry
April 30, 2013

Chemistry
Thank you :) this helped a lot!
April 30, 2013

Chemistry
Can you explain it better we JUST started this section and im having a hard time with knowing what to put where when it comes to the solutions. what is the acid and what is the base
April 30, 2013

Chemistry
The pK3 of formic acid is 3.75 A)what is the pH of a buffer in which formic acid and sodium formate have equimolar concentration? B)what is the pH of a solution in which the sodium formate is 10M and the formic acid is 1M?
April 30, 2013

statistics
What is the probability that 10 of 100 apples will be < 130 g? mean=173 std deviation=34?
April 23, 2013

Science
For an Indian Youth Environment camp essay why should someone be chosen to go?
April 18, 2013

chemistry
calculate the yield of CO2 if 30.g of C2H6 reacts with 14.0g of O2. Show work
April 18, 2013

Calculus
Find the arc length of the curve described by the parametric equation over the given interval: x=t^(2) + 1 y=2t - 3 0<t<1
April 16, 2013

Calculus help!
On what intervals of t is the curve described by the given parametric equation concave up? Concave down? x=t^2; y=t^(3) + 3t I am a bit confused on how to solve this...any help/explanations are welcome!! (& greatly appreciated!)
April 16, 2013

Calculus
Find the arc length of the curve described by the parametric equation over the given interval: x=t^(2) + 1 y=2t - 3 --> 0<t<1
April 16, 2013

Calculus
Convert the polar equation to rectangular coordinates: r = 2-cos theta ...and find all points of vertical and horizontal tangency.
April 16, 2013

Calculus
Find the arc length of the curve described by the parametric equation over the given interval: x=t^(2) + 1 y=2t - 3 ...0 < t < 1
April 16, 2013

Calculus
On what intervals of t is the curve described by the given parametric equation concave up? Concave down? x=t^2; y=t^(3) + 3t I am a bit confused on how to solve this...any help/explanations are welcome!! (& greatly appreciated!)
April 15, 2013

Calculus
Convert the curve to an equation in rectangular coordinates: x=(t+2); y=-2sqrt(t)
April 15, 2013

Parametric Equations
Find the length of the curve over the given interval: x=t+1 y=ln cos(t) for t=0 ---> t=pi/4
April 14, 2013

calculus
Find the length of the curve over the given interval: x=t+1 y=ln cos(t) for t=0 ---> t=pi/4
April 14, 2013

Calculus
Convert to a rectangular equation by eliminating the parameter: x=sin(theta) y=(cos theta)^2
April 13, 2013

Statistics
The Boeing 757-200 ER airliner carries 200 passengers and has doors with a height of 72 inches. Heights of men are normally distributed with a mean of 69 inches and a standard deviation of 2.8 inches. b) assume that half of the 200 passengers are men, what doorway height ...
April 8, 2013

Math- Ms Sue can you help
so the volleyball team had a standard deviation 2.39 and a mean of 68.2 ( I messed up when giving you the numbers, there should have been a comma between 69 &70 not a period-giving 10 numbers) The dance team I got 3.05 standard deviation and a mean of 63 So the should the ...
March 31, 2013

Math-
I didn't do the standard deviation for each one because I didn't know how, can you help?, if not do you have something ( a link to forward me to) so I can review standard deviations. I do appreciate your help.
March 31, 2013

Math- Ms Sue can you help
Here is the height, in inches, of 10 randomly selected members of the girls' dance team and 10 randomly selected of the girls' volleyball team Based on the interquartile ranges of the two sets of data, which is a reasonable conclusion concerning heights of the players ...
March 31, 2013

math- Reiny can you help
can you help with the above question
March 31, 2013

math- please help
Here is the height, in inches, of 10 randomly selected members of the girls' dance team and 10 randomly selected of the girls' volleyball team Based on the interquartile ranges of the two sets of data, which is a reasonable conclusion concerning heights of the players...
March 31, 2013

math
Here is the height, in inches, of 10 randomly selected members of the girls' dance team and 10 randomly selected of the girls' volleyball team Based on the interquartile ranges of the two sets of data, which is a reasonable conclusion concerning heights of the players ...
March 30, 2013

7th grade math
A restaurant donates 2 cans of soup to charity for every 9 bowls of soup it sells. The number of cans of soup donated by the restaurant is proportional to the total number of bowls of soup sold. Which equation represents the relationship between b, the number of bowls of soup ...
March 29, 2013

Public Speaking
For communication to take place, there has to be: A. transmission of the message. B. medium. C. sharing of meaning. D. absence of noise. is it A is incorrect cause that's wat i had i think is B Which is NOT a benefit of studying public speaking? A. Creates good first ...
March 28, 2013

Public Speaking
Which is NOT a benefit of studying public speaking? A. Creates good first impression on others B. Communicates competence C. Proves our expertise D. Develops our ability to communicate ideas and message clearly and with impact correct ans: c
March 28, 2013

Calculus
does the sum 3/(2^(n)-1) converge or diverge? n=1--->infinity
March 26, 2013

Calculus
Is the series 2/ln(n) convergent or divergent? n=3 to n=infinity
March 26, 2013

Calculus
Is the series 1/(n(n+1)) convergent? n=2 to n=infinity
March 25, 2013

math
Find the base of a triangle whose area is 60in squared and whose height is 6 inches I did 1/2 bh=A 60=3b so b=60/3 b=20 then check so A=1/2bh A=1/2(20)6 A=1/2(120) A=60in squared is this correct?
March 17, 2013

world history
Any ideas to build a hippodrome for a school project
March 16, 2013

Physics...PLZ!! =)
A conducting rod whose length is 25 cm is placed on a U-shaped metal wire that has a resistance R of 8 Ù. The wire and the rod are in the plane of the paper. A constant magnetic field of strength 0.4 T is applied perpendicular and into the paper. An applied force moves ...
March 12, 2013

Physics
A 200-loop coil of cross sectional area 8.5 lies in the plane of the paper. Directed out of the plane of the paper is a magnetic field of 0.06 T. The field out of the paper decreases to 0.02 T in 12 milliseconds. (a) What is the magnitude of the change in magnetic flux ...
March 12, 2013

Physics
A 50-cm wire placed in an East-West direction is moved horizontally to the North with a speed of 2 m/s. The Horizontal and Vertical components of the earth's magnetic field at that location are 25 ìT and 50ìT respectively. What is the emf between the ends of ...
March 12, 2013

chemistry
If 5.30mL of 0.1000 M NaOH solution is needed to just neutralize excess acid after 20.00 mL of 0.1000 M HCl was added to 1.00 g of an antacid, how many moles of acid can the antacid counteract per gram?
March 3, 2013

math
You must be doing the same worksheet we are doing right now. :) Why can't I do first grade math?
February 28, 2013

Math
Ha ha ha Steve!! That's about as far as I got too! It was supposed to end up $400. No idea how though.
February 27, 2013

Math
Mr Shea saved $2500 in April. His monthly salary is two times the amount he saved in April. In May, he saved a certain amount of money. He spent $4200 more than the amount he saved. How much did he save in May? Please explain in easy to understand equations. I am ...
February 27, 2013

Math
Mr Shea saved $2500 in April. His monthly salary is two times the amount he saved in April. In May, he saved a certain amount of money. He spent $4200 more than the amount he saved. How much did he save in May? Please explain in easy to understand equations. I am ...
February 27, 2013

Physics--PLZ HELP!
Thanks! I did and originally got E)north magnetic pole but....now I'm second guessing myself that it is D)South magnetic pole..????!?!?!?
February 26, 2013

Physics--PLZ HELP!
When the switch is closed in a circuit, the wire between the poles of the horseshoe magnet deflects upward. From this you can conclude that the left end of the magnet is ---- -- -- -- -- -- -- A) a magnetic dipole. B) not contributing to the wire's deflection. C) a ...
February 26, 2013

Calculus
find the limit as x approaches 0 (arcsin x)/x
February 20, 2013

calculus
Use the shell method to find the volume of the solid formed by rotating the region bounded by y=x^3, y=0, x=0, and x=2 about the line x=3.
February 4, 2013

Calculus
Use the disk method to find the volume of the solid formed by rotating the region bounded by y=2x and y=x^2 about the y-axis
February 4, 2013

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