Saturday

November 22, 2014

November 22, 2014

Total # Posts: 1,182

**Physics**

A parallel-plate capacitor is charged by a battery and then the battery is removed and a dielectric of constant K is used to fill the gap between the plates. Inserting the dielectric changes the energy stored by a factor of A)2. B)1/K. C)1 (no change). D)K. E)K-1.
*February 3, 2013*

**physics - conceptual**

Three identical capacitors are connected in series to a battery. If a total charge of Q flows from the battery, how much charge does each capacitor carry? A)9Q B)Q/3 C)Q D)3Q E)Q/9
*February 3, 2013*

**Physics -conceptual**

A 1 mF, a 2 mF, and a 3 mF capacitor are connected in series, the combination being connected across a 9 volt battery. Which capacitor has the greatest voltage?
*February 3, 2013*

**math**

how tall would a statue of a 5 foot 6 inch woman be if the scale for the statue is 1 foot 8 inches
*February 3, 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.
*January 30, 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.
*January 30, 2013*

**Algebra**

The price of a printer was reduced from 400 to 280. What was the percentage decrease?
*January 30, 2013*

**calculus**

Find the area of region bounded by the curves y=sin(pi/2*x)and y=x^2-2x.
*January 30, 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.
*January 30, 2013*

**Math**

Can u give me the answers to # 5-12 and 2,4
*January 29, 2013*

**Consumer Math**

Can you please check my answers:) 1. John Gray bought a basic car for $8,250.00, with options that cost $324.00. There's a 6% sales tax in his state and a combined $50.00 license and registration fee. What was John's total cost? A. $9,138.44 B. $10,000.00 C. $9,141.44 ...
*January 28, 2013*

**Math**

Can you please check my answers:) 1. John Gray bought a basic car for $8,250.00, with options that cost $324.00. There's a 6% sales tax in his state and a combined $50.00 license and registration fee. What was John's total cost? A. $9,138.44 B. $10,000.00 C. $9,141.44 ...
*January 28, 2013*

**Math**

2x-3y=6 I did +3y 2x=6+3y 1/2 to both sides(2x=3y/2+6) x=3/2y+6 or does the 1/2 go under the hole equation 0f3/2y+6 making the answer x=3/2y+3 Thanks
*January 21, 2013*

**algebra**

A total of $15,000 is invested into two accounts. One of the accounts earns 12% per year and the other earns 10% per year. If the total interest earned in the first year is $1600, how much is invested in each account? 1.) Define the variable(s) and what they stand for. 2.) Set...
*January 18, 2013*

**math**

in rhombus abcd the measure in inches of ab is 5x+7 and dc is 2x+25 find the number of inches in the length of dc
*January 11, 2013*

**algebra**

Factor the polynomial expression. If necessary, use the caret (^) to enter exponents. For example, write x2 as x^2.2x2 + 13x + 15
*January 9, 2013*

**Math**

I want to open a savings account that earns 1.6% simple interest yearly. I want to earn exactly $288 in interest after 3 years. How much money should I deposit?
*January 8, 2013*

**Math**

A maker of a cubic number blocks packs a rectangular box so that there are 8 blocks along one edge, 10 blocks along the second edge, and 4 blocks along the third edge. How many blocks will be shipped in this box
*January 6, 2013*

**calc arc length**

Find the length of the arc along f(x) = integral from 0 to x^3 sqrt(cos t) dt on the set of x [0, pi/3].
*December 19, 2012*

**Math**

x^2-4x-32 / x^2-20x-96 how do you simplify this?
*November 29, 2012*

**structure and function of the human body**

What is the importance of ATP? explain where carbohydrate metabolism occurs in the cell, what additonal ingredient is needed and what waste product is produced in this process?
*November 27, 2012*

**physics**

A ball is thrown horizontally from the top of a building 17.6 m high. The ball strikes the ground at a point 67.7 m from the base of the building. The acceleration of gravity is 9.8 m/s^2 1. Find the time the ball is in motion. Answer in units of s. 2. Find the initial ...
*November 19, 2012*

**physics**

A ball is thrown horizontally from the top of a building 17.6 m high. The ball strikes the ground at a point 67.7 m from the base of the building. The acceleration of gravity is 9.8 m/s^2 Find the time the ball is in motion. Answer in units of s
*November 19, 2012*

**Chemistry**

N2(g)+3H2(g) -> 2NH3(g)+ 22000 cal Consider the reaction is at equilibrium. Explain how the equilibrium is shifted when a. more N is added b. more H is added c. ammonia is removed
*November 12, 2012*

**Chemistry**

What is the pH of a solution prepared by mixing 10 mL of 0.10 M NH3 and 5.0 mL of 0.24 M NH4+. Assume Ka(NH4+) = 5.56 x 10^-10
*November 11, 2012*

**Precalc/Trig**

evaluate the expression assuming that cos(x)=1/7, sin(y)=1/3, sin(u)=2/5 and cos(v)=1/3. what is cos(u+v)? sin(x-y)? and tan(u-v)?
*November 10, 2012*

**Math**

I got 28.3
*November 8, 2012*

**math**

A blue candle is twice as long as a red one. The blue takes 6 hours to burn out and red takes 15 hours. After 5 hours, what fractional part of each is left? Thanks for your help!
*November 1, 2012*

**math**

A blue candle is twice as long as a red one. The blue takes 6 hours to burn out and red takes 15 hours. After 5 hours, what fractional part of each is left? Thanks for your help!
*November 1, 2012*

**Anatomy & Physiology**

what would happen if there were no negative feedback control on growth hormone and thyroid hormone?
*November 1, 2012*

**Precalc/Trig**

Find the smallest positive number t such that e^sin(t)=1/2
*October 20, 2012*

**Precalc/Trig**

what angle does the line y=6/7x make on the xy plane with a positive x axis?
*October 20, 2012*

**Precalc/Trig**

what angle does the line y=6/7x make on the xy plane with a positive x axis?
*October 20, 2012*

**Physics**

30. A truck of mass 2250 kg is used to pull a 330 kg trunk out of an old quarry as shown below. There is 550 N of rolling resistance for the truck. Ignore mass and friction of the pulley. (a) If the trunk is accelerated upward at 2.00 m/s2 what is the minimum amount of ...
*October 19, 2012*

**grammar**

their are children waiting in the lobby what is the simple subject
*October 16, 2012*

**Calc II**

A worker on scaffolding 65 ft above the ground needs to lift a 390 lb bucket of cement from the ground to a point 20 feet above the ground by pulling on a rope weighing 5 lb/ft. How much work is required?
*October 16, 2012*

**physics**

A spring gun (k = 27.1 N/m) is used to shoot a 51.1-g ball horizontally. Initially the spring is compressed by 16.5 cm. The ball loses contact with the spring and leaves the gun when the spring is still compressed by 11.5 cm. What is the speed of the ball when it hits the ...
*October 10, 2012*

**Physics..PLZ HELP!! **

A rollercoaster reaches the top of the steepest hill with a speed of 6.0 km/h. It then descends the hill, which is at an average angle of ?=45 and is 45.0 m long. Estimate its speed when it reaches the bottom. Assume µk=0.18.
*October 8, 2012*

**Calculus...plz help!!**

find dy/dx of xsiny-ycosx=1
*October 7, 2012*

**CALCULUS help!!!=))**

find dy/dx (-x^2)(y)+2xy=3y^2-7
*October 7, 2012*

**CALCULUS help!!!=))**

find dy/dx -x^2y+2xy=3y^2-7
*October 7, 2012*

**CALCULUS help! =)**

find the derivative of f(x)=3x^2-x using the limit definition.
*October 7, 2012*

**calculus PLZ HELP!!**

find the equation for the line tangent to the curve at the given point. (x^2)(y^2)-2xy+x=1 at (2, 1/2)
*October 7, 2012*

**calculus =)**

find the derivative of g(x)=sin(cos(sin(pi*x)))
*October 7, 2012*

**calculus**

grain is being poured through a chute at rate of 8 ft^3/min and forms a conical pile whose radius of the bottom is always 1/2 the height of pile. How fast is circumference increasing when the pile is 10 feet high?
*October 7, 2012*

**Physics**

Centrifuges are commonly used in biological laboratories for the isolation and maintenance of cell preparations. For cell separation, assume centrifugation conditions that are 1.00 x 103 rpm using an 8.16-cm-radius rotor. What is the radial acceleration of material in the ...
*October 3, 2012*

**American Government**

I have went back and re read my chapter I'm still having problems with this question. I have changed my answer from B to C less accurate than the idea that Americans form many publics, which differ greatly in such things as the level of attention thy pay to politics. ...
*October 2, 2012*

**American Government**

The term "public opinion" is frequently used in reference to all of American society. This perspective is? A. accurate, since Americans are one people and indivisible B. less accurate than view of public opinion based on majority, since the political system operates ...
*October 2, 2012*

**American Government**

A member of Congress who wants to act on what the majority of his or her constituency thinks on a particular issue would be advised to respond to which of the following indicators? A. letters from constituents B. the editorial positions of newspapers in the country C. PUBLIC ...
*October 2, 2012*

**PHYSICS**

A projectile is fired from the surface of the Earth with a speed of 150 meters per second at an angle of 45 degrees above the horizontal. If the ground is level, what is the maximum height reached by the projectile?
*October 1, 2012*

**AP PYHSICS**

A projectile is fired from the surface of the Earth with a speed of 150 meters per second at an angle of 45 degrees above the horizontal. If the ground is level, what is the maximum height reached by the projectile?
*October 1, 2012*

**Computers**

Daily Life Magazine wants an analysis of the demographic characteristics of its readers. The Marketing Department has collected reader survey records containing the age, gender, marital status, and annual income of readers. Design an application that accepts reader data and ...
*September 30, 2012*

**Physics**

Luke stands on a scale in an elevator which has a constant acceleration upward. The scale reads 0.964 kN. When Luke picks up a box of mass 18.2 kg, the scale reads 1.202 kN. (The acceleration remains the same.) Calculate the acceleration of the elevator (enter first). Is it up...
*September 27, 2012*

**us history**

what are the political and social trends from westward expansion
*September 26, 2012*

**Physics**

If accerlation is constant, then that would show a straight line on the graph, correct? So that line has a slope=0.
*September 24, 2012*

**Physics**

When a baseball is tossed directly upward, what is the slope of a plot of its acceleration versus time during the upward flight? plot has constant positive slope plot has constant negative slope plot has zero slope I think it is zero slope
*September 24, 2012*

**us history**

what are the political and social trends from westward expansion
*September 24, 2012*

**physics**

A model sailboat is slowly sailing west across a pond at 0.342 m/s. A gust of wind blowing at 28.7° south of west gives the sailboat a constant acceleration of magnitude 0.305 m/s2 during a time interval of 1.87 s. If the net force on the sailboat during the 1.87-s ...
*September 24, 2012*

**physics**

The coefficient of static friction between a block and a horizontal floor is 0.414, while the coefficient of kinetic friction is 0.107. The mass of the block is 4.03 kg. A horizontal force is applied to the block and slowly increased. What is the value of the applied ...
*September 23, 2012*

**Physics**

A gull is flying horizontally 8.17 m above the ground at 6.35 m/s. The bird is carrying a clam in its beak and plans to crack the clamshell by dropping it on some rocks below. Ignoring air resistance, what is the horizontal distance to the rocks at the moment that the gull ...
*September 23, 2012*

**Physics**

1) On a plot of position x versus time t for an object’s motion, what corresponds to the object’s velocity at any given instant t1? A. slope at the point on the plot corresponding to t1 B. intercept on the horizontal axis C. inverse of the slope at the point on the ...
*September 21, 2012*

**Math**

A landscaper plans to cover a 9-by-18-foot rectangular flower bed with bark dust 3 inches deep.The bark dust he is using costs $26 per cubic yard.What will be the total cost of the bark dust for this job? A) $64 B) $49 C) $39 D) $54
*September 18, 2012*

**math**

How to use a number line to round 148 to the nearest ten.
*September 17, 2012*

**physics**

a uniform meter stick is balanced at its midpoint with a single support. a 50 N weight is suspended at the 30 cm mark. at what point must a 20 N weight be hung to balance the system
*September 16, 2012*

**physics**

a person weights 550 N rides a bike. the pedals move in a circle of radius 30 cm. if the entire wt acts on each downward moving pedal, what is maximum torque
*September 16, 2012*

**physical science**

A 136-lb. student races up stairs with a vertical height of 4.8 m in 6.0 s to get to a class on the second floor. How much power in watts does the student expend in doing work against gravity?
*September 9, 2012*

**physical science**

What is the kinetic energy of a 29 kg dog that is running at a speed of 8.8 m/s (about 20 mi/h)?
*September 9, 2012*

**physical science**

How much work does gravity do on a 0.140-kg ball falling from a height of 14.0 m? (neglect air resistance)
*September 9, 2012*

**Physical science**

A man pushes a lawn mower on a level lawn with a force of 192 N. If 50% of this force is directed downward, how much work is done by the man pushing the mower 7.3 m?
*September 9, 2012*

**Physical science**

A 6.2 "kil" bag of sugar is on a counter. How much work is required to put the bag on a shelf a distance of 0.31 m. above the counter?
*September 9, 2012*

**Computers**

The Romance World Cruise Line provides special gifts for passengers who are newlyweds, as well as for those who have been married more than 40 years. Design a pseudocode for a program that accepts a couple's last name, ship cabin number, and number of years married. ...
*September 3, 2012*

**Algebra**

What the general term a_n for the geometric sequence a_1= -5 and a_2= 15
*September 2, 2012*

**Math**

which is the easies,t Arithmetic Series or a Geometric Series? and why?
*September 1, 2012*

**earth**

The radius of the Earth is approximately 6370 km. If one could dig down straight towards the center of the Earth, one would find that the outermost 2890 km (the crust and the mantle) has an average density of about 4.5 g/cm3. Farther down is the core. If the average density of...
*August 26, 2012*

**Algebra**

How is a quadratic inequality different from a quadratic equation?
*August 23, 2012*

**Algebra **

please help me on how to complete the table and evaluate f(x) x=0, x=1, x=2, x=3, x=4 f(x)7/x-1 my answers were -7 for x=0 7/0 for x=1 7 for x=2 7/2 when divided 3.5 ?? for x=3 7/3 when divided 2.3 ?? for x=4 I am not sure if this is correct.. please HELP ME..!
*August 16, 2012*

**Algebra II**

Please help! I am stuck on this one. Need to simplify the expression. Assuming all variables are real numbers. ∛(27(x+2)^3) my answer =3x+6 not sure is this is correct.
*August 8, 2012*

**Algebra II**

thank you :)
*August 8, 2012*

**Algebra II**

simplify by factoring ã90 is this correct? ^3ã10
*August 8, 2012*

**Algebra **

please help. I am not sure if this is correct. I need to simplify this to the lowest terms a^2 - 4b ^2 _____ ______ a+2b a+2b my answer is: a^2-4b^2 _________ a+2b is this really to the lowest term?? for some reason I think I am doing this wrong. Thank you!
*August 5, 2012*

**Algebra 1B**

Thank you so much! Now I undersand .. :)
*August 2, 2012*

**Algebra 1B**

Please help I am so confused... Question: supposed that y is directly proportional to x. a) use the given info to find constant of proportionally k. b) then use y=kx to find y for x=6 y= -62 when x=5 Please help.. thank you this is all I have so far. not sure if I am correct. ...
*August 2, 2012*

**chem**

What volume in liters is occupied by 8.22 g of SO2 gas confined at a pressure of 1200.8 torr at 75.0*c?
*August 1, 2012*

**chem **

A 5.00 liter sample of gas measured at 27.0*C and 1.25 atm presure has a mass of 10.13 g. What is the formula weight of the gas?
*August 1, 2012*

**chem**

Calculate the formula wright of a 2.50 g sample of gas whose volume is 1.40l at STP.
*August 1, 2012*

**CHEM**

A GAS TAKES UP 25.2 L AT 25*C. AT 25*c THE GAS CAN ALSO TAKE UP 12.2lAT 1520 TORR. WHAT WAS THE PRESSURE IN ATM, OF THE ORIGINAL SAMPLE? I GOT 4.1S ATM. IS THAT RIGHT?
*August 1, 2012*

**CHEM**

yes, by adding 273.15 right?
*August 1, 2012*

**CHEM**

IF A SAMPLE OF GASE HAVE A VOLUME OF 8.20 L AT 25*C AND 2.00 ATM, HOW MUCH VOLUME WILL IT TAKE UP IF YOU DECREASE THE PRESSURE TO 1.50 ATM AND INCREASE THE TEMPERATURE TO 100*C?
*August 1, 2012*

**Algebra**

Is it possible to factor a sum of two squares by using real numbers?
*July 26, 2012*

**Us History**

The Treaty of Versailles, explain what it was and why the United States refused to sign it. Predict how the missing signature of the United States might affect Europe in the future.
*July 21, 2012*

**Calc**

Not a fraction, so 331.7 thank you!!
*July 19, 2012*

**Calc**

The U.S. population is approximated by the function P(t) = 556 1 + 3.72e−0.5t where P(t) is measured in millions of people and t is measured in 30-year intervals, with t = 0 corresponding to 1930. What is the expected population of the United States in 2020 (t = 3)? (...
*July 19, 2012*

**psychology**

how effective is classical conditioning in the long tem
*July 15, 2012*

**economics**

Why might management and economic theories not always work in the real world?
*July 13, 2012*

**economics**

A copy company wants to expand production. It currently has 20 workers who share eight copiers. Two months ago, the firm added two copiers, and output increased by 100,000 pages per day. One month ago, they added five workers, and productivity also increased by 50,000 pages ...
*July 13, 2012*

**Math**

Joe drank 4 liters of water on Monday and 4 deciliters of water on Tuesday. How much more water did he drink on Monday than on Tuesday?
*July 10, 2012*

**Calculus**

Find if the limit exists. lim tan(x)/x x->0 Please show how you determined this. Thanks!
*July 1, 2012*

**Calculus**

Find an equation of the line that is tangent to the graph of f and parallel to the given line. Funtion: f(x)=1/sqrt(x-1) Line: x+2y+7=0
*June 30, 2012*

**Calculus**

**Note** Please use the Epsilon-Delta Definition.
*June 27, 2012*

**Calculus**

I have two similar problems that I need help completing. Please show all your work. Question: Find the limit L. Then use the å-ä definition to prove the limit is L. 1. lim (2x+5) x->3 2. lim 3 x->6 Thank you for your anticipated help!!
*June 27, 2012*

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