Friday

March 27, 2015

March 27, 2015

Total # Posts: 127

**Chemistry**

For the complete combustion of 1.000 mole of ethane gas at 298K and 1 atm pressure, change in H= -1560 kJ/mol. What will be the heat released when 4.42g of ethane is combusted under these conditions?
*October 25, 2014*

**math Question**

the 5th term in a geometric sequence is 160. The 7th term is 40. What are the possible values of the 6th term of the sequence +70 70 +80 80
*May 19, 2014*

**Science**

Hey guys! If you could help me with a few of these question (they are fill in the blanks), that would be much appreciated. 1. Fertilizers and pesticides pplied to farm fields in Pennsylvania have made their way down into the Chesapeake Bay in Maryland. This is an example of ...
*April 8, 2014*

**Physics!**

has no reaction counterpart
*March 19, 2014*

**science**

If we drilled a hole straight through the earth, and dropped a golf ball down the hole, starting initially at rest, how fast would the ball be traveling when it reached the center of the earth. The earth’s radius is 6378 km.
*February 6, 2014*

**algerba 1**

i need help solving the properties of an quotient properties of exponents
*October 29, 2013*

**Math**

For each 10-degree adjustment on your water heater thermostat, you can reduce carbon dioxide emissions by 500 pounds a year. By how many pounds will you reduce your carbon dioxide footprint if you turn down your water heater thermostat from 140¢ªF to 120¢ªF...
*April 8, 2013*

**Math: Solving Trig Equation**

9tan (x) - 9 sec^2 (x)/ tan (x)
*March 31, 2013*

**College Algebra**

A rectangle is bounded by the x-axis and the semicircle Y= SQ RT of 4-x^2. Write the area A of the rectangle as a function of x and determine the domain of the function.
*February 16, 2013*

**stats**

A clothing company employs 36 workers on first shift and 19 workers on second shift. Five workers are chosen at random to be interviewed about the work environment. Find the probability of choose: a) All first-shift workers b) all second-shift workers c) six first-shift ...
*February 10, 2013*

**Math**

by solving at hand?
*November 25, 2012*

**Math**

How did you get 36/7 Ms. Sue?
*November 25, 2012*

**Math**

-90/7+18 step by step, fraction answer
*November 25, 2012*

**math**

A study wants to examine the relationship between student anxiety for an exam and the number of hours studied. The data is as follows: Student Anxiety Scores Study Hours 5 1 10 6 5 2 11 8 12 5 4 1 3 4 2 6 6 5 1 2 Why is a correlation the most appropriate statistic? What is the...
*November 11, 2012*

**Case Management**

Intervention planning involves both treatment planning and service planning. Treatment planning involves planning for clinical or therapeutic services, while service planning involves the linking of clients to services for comprehensive assistance. Describe effective ...
*November 2, 2012*

**Math**

The table shows men's shoe sizes in the United States and the corresponding European shoe sizes. Let y = f(x)represent the function that gives the men's European shoe size in terms of x, the men's U.S. size. Men's U.S. shoe size, Men's European shoe size 8 ...
*October 24, 2012*

**Algebra**

Year, t Sales, S(t) 1 62 2 246 3 664 4 1579 5 3258 6 8430 7 14,532 (c) If S−1 exists, find S−1(3,258).
*October 23, 2012*

**Algebra**

Give the domain of (f - g)(x) and (g of f)(x) where f(x)=3 -x and g(x) - ã(x)
*October 15, 2012*

**Math**

The number N of bacteria in a refrigerated food is given by N(T) = 10T2 − 20T + 700, 1 ¡Ü T ¡Ü 20where T is the temperature of the food in degrees Celsius. When the food is removed from refrigeration, the temperature of the food is given by T(t) = ...
*October 15, 2012*

**Math**

The table plot on my homework is givving me the wrong answer.
*October 14, 2012*

**Math**

It's still giving me the wrong answer. and how do I plot -5/2, when the graph shows no decimals?
*October 14, 2012*

**Math**

Graph the function. g(x)={x+2, x less than or equal to -3 1/2x-2, x>-3
*October 14, 2012*

**Algebra**

Find the difference quotient and simplify your answer. Step by step. f(x) = 3x2 − 6x, f(x + h) − f(x) h , h ‚ 0
*September 30, 2012*

**Algebra**

Which sets of ordered pairs represent functions from A to B? (Select all that apply), and Explain how you've gotten your answer? A = {a, b, c} B = {8, 9, 10, 11}
*September 30, 2012*

**world history**

How did spain change after the war with england in 1588?
*September 22, 2012*

**Algebra**

The number of medical doctors D (in thousands) in the United States from 1998 through 2006 can be modeled by D = 431.61 + 121.8t, 8 ¡Â t ¡Â 16 where t represents the year, with t = 8 corresponding to 1998.¢Ó (a) In which year did the number ...
*September 8, 2012*

**Algebra**

square roots to replace the a's
*September 8, 2012*

**Algebra**

I'm sorry I wrote the equation wrong 3ã(x+1)-ã(7x+8)=1
*September 8, 2012*

**Algebra**

square root>(3x + 1)− square root>(7x + 8)= 1
*September 8, 2012*

**Algebra**

x^3 + 6x^2 + 5x + 30 = 0
*September 8, 2012*

**Physics**

Use the position equation given below, where s represents the height of the object (in feet), v0 represents the initial velocity of the object (in feet per second), s0 represents the initial height of the object (in feet), and t represents the time (in seconds), as the model ...
*September 3, 2012*

**Physics**

An open box with a square base (see figure) is to be constructed from 160 square inches of material. The height of the box is 3 inches. What are the dimensions of the box? (Hint: The surface area is S = x2 + 4xh.) 1 . in. (length) × 2 . in. (width) × 3 . in. (height)
*September 3, 2012*

**Algebra**

The floor of a one-story building is 14 feet longer than it is wide (see figure). The building has 1472 square feet of floor space. a) Write a quadratic equation for the area of the floor in terms of w. (b) Find the length l and width w of the floor.
*September 2, 2012*

**science**

when you want to pull downward to lift something, the main advantage of passing a rope upward and through a single pulley, rather than just up over the branch of a tree, is that the pulley does what?
*July 21, 2012*

**Chemistry**

A)How many moles of O2 are required for the complete combustion of 2.2 g of C3H8 to form CO2 and H2O? b)A 65.25 g sample of CuSO4•5H2O (M = 249.7) is dissolved in enough water to make 0.800 L of solution. What volume of this solution must be diluted with water to make 1....
*May 16, 2012*

**Algebra**

Thank You so much Elle
*February 8, 2012*

**Algebra**

Write an equation of the line containing the given point and perpendicular to the given line. Express your answer in the form y=mx+b. (2,4) 3x+y=6 The equation of line is y=, and explain how you have gotten the answer.
*February 8, 2012*

**Algebra Math**

Thank You Reiny for your help, I accidentally posted the question under the other student's question, I apoloigze.
*February 5, 2012*

**Algebra Math**

Thank You, Declan for answering my question, but I am still haiving trouble on the problem, could you explain to me of how you went about getting the answer -55/4, in deeper detail.
*February 5, 2012*

**math**

Write an equation of the line containing the given point and parallel to the given line. (6,-7):9x-8y=3 The equation of the line is y=
*February 5, 2012*

**Math**

Write an equation of the line containing the given point and parallel to the given line. (6,-7):9x-8y=3 The equation of the line is y=
*February 5, 2012*

**physics**

How long is a rocket in the air if it is shot at an angle of 55¢ª with an initial velocity of 25 m/s and traveled for 88 m
*January 29, 2012*

**physics**

A ball rolling down an incline travels 6.0 m in the first 0.25 seconds, and 24 m in the first 0.50 seconds. Find: The average speed for the first time interval
*January 16, 2012*

**Chemistry**

What is the activation energy for a simple A->B fist order type of reaction with the following rate constants at different temperatures? Temp rate constant (k) 310K 1.77 x 10-1s-1 480K 3.22 x 10^2s-1
*December 7, 2011*

**physics**

Please help. Thanks! A car/truck with an initial displacement of 10.0 m and an initial velocity of 16.0 m/s accelerates at an average rate of 0.50 m/s2 for 4.0 s. What is the vehicle's displacement after 4.0 s?
*November 30, 2011*

**physics**

two dogs play tug of war with a rope toy that has a mass of 0.50 kg. if one dog pulls on the toy with a force of 140.0 N, and the other dog pulls in the opposite direction with a force of 138.0 N, what is the horizontal acceleration of the toy?
*November 30, 2011*

**Chemistry**

Write the general rate equation for each of the components in the balanced equation for the combustion of butane 2C4H10(g)+ 13O2(g)-> 8CO2(g) + 10H2O(l)
*November 27, 2011*

**Chemistry**

Thank you!
*November 26, 2011*

**Chemistry**

do you then multiply that answer by 100?
*November 26, 2011*

**Chemistry**

What is the mass percent of NaCl in a solution obtained by mixing 50g of this solution with 215g of H20?
*November 26, 2011*

**physics**

A concave mirror has a focal length of 13 cm. The mirror forms an image located 40 cm in front of the mirror. What is the magnification of the mirror?
*November 17, 2011*

**Physics**

A drop of water on a countertop reflects light from a flower held 2.8 cm directly above it. The flower's diameter is 1.7 cm, and the diameter of the flower's image is 0.17 cm. What is the focal length of the water drop, assuming that it may be treated as a convex ...
*November 17, 2011*

**Physics**

The outside mirror on the passenger side of a car is convex and has a focal length of -7.2 cm. Relative to this mirror, a truck traveling in the rear has an object distance of 20 m. Find (a) the image distance and (b) the magnification of the mirror.
*November 17, 2011*

**Chemistry**

How many grams of CO2 would be produced from the following reaction sequence? HI + KHCO3 -> KI + H2CO3 H2CO3 -> H2O + CO2 if 20.0 ml of 1.00 M KHCO3 solution is mixed with 20.0 ml of 1.50 M HI solution.
*November 15, 2011*

**Statistics**

For all of the following use the five step process to solve the problem in the question, that is, state the null hypothesis, the alternative hypothesis, the level of significance and the type of test (z-test, t-test, p-value, confidence limit and whether it is two tailed, one-...
*November 11, 2011*

**Statistics**

Please help!! I have no idea how to do this question. 14. A sample of 40 CD’s from your collection showed a mean length of 52.74 minutes with a standard deviation of 13.21 minutes a. Construct the 95 percent confidence interval for the mean. b. Construct the 95 percent ...
*October 31, 2011*

**Physics**

A 5.30-ìC charge is moving with a speed of 9.30 x 104 m/s parallel to a very long, straight wire. The wire is 6.60 cm from the charge and carries a current of 87.0 A. Find the magnitude of the force on the charge.
*October 29, 2011*

**Physics**

A 5.30-ìC charge is moving with a speed of 9.30 x 104 m/s parallel to a very long, straight wire. The wire is 6.60 cm from the charge and carries a current of 87.0 A. Find the magnitude of the force on the charge.
*October 29, 2011*

**Physics**

A)Two identical resistors are connected in parallel across a 30-V battery, which supplies them with a total power of 7.0 W. While the battery is still connected, one of the resistors is heated so that its resistance doubles. The resistance of the other resistor remains ...
*October 24, 2011*

**Physics**

A)Two identical resistors are connected in parallel across a 30-V battery, which supplies them with a total power of 7.0 W. While the battery is still connected, one of the resistors is heated so that its resistance doubles. The resistance of the other resistor remains ...
*October 22, 2011*

**Chemistry**

A)What mass of silver chloride can be produced from 1.33 of a 0.207 solution of silver nitrate? I got this one, its 39.4 g B)The reaction described in Part A required 3.28 of potassium chloride. What is the concentration of this potassium chloride solution? I keep getting 0.08...
*October 14, 2011*

**Physics**

A)What mass of silver chloride can be produced from 1.33 of a 0.207 solution of silver nitrate? I got this one, its 39.4 g B)The reaction described in Part A required 3.28 of potassium chloride. What is the concentration of this potassium chloride solution? I keep getting 0.08...
*October 14, 2011*

**Physics**

Two point charges, +3.90 ìC and -7.50 ìC, are separated by 3.30 m. What is the electric potential midway between them?
*October 8, 2011*

**Physics**

I have done this, but I still cannot get the correct answer.
*October 8, 2011*

**Physics**

A)Two point charges, +3.90 ìC and -7.50 ìC, are separated by 3.30 m. What is the electric potential midway between them? B)The drawing shows four point charges. The value of q is 1.3 ìC, and the distance d is 0.95 m. Find the total potential at the ...
*October 8, 2011*

**Physics**

Four identical metallic objects carry the following charges: +1.46, +6.39, -4.06, and -9.94C. The objects are brought simultaneously into contact, so that each touches the others. Then they are separated. (a) What is the final charge on each object? (b) How many electrons (or ...
*October 1, 2011*

**Physics**

Four identical metallic objects carry the following charges: +1.46, +6.39, -4.06, and -9.94C. The objects are brought simultaneously into contact, so that each touches the others. Then they are separated. (a) What is the final charge on each object? (b) How many electrons (or ...
*September 30, 2011*

**Chemistry**

How many oxygen atoms are in 3.20g of quartz?
*September 28, 2011*

**Physics**

The drawing (which I will describe) shows a top view of a door that is free to rotate about an axis of rotation that is perpendicular to the screen. Find the net torque (magnitude and direction) produced by the forces F1 and F2 about the axis. Picture displays a yellow ...
*August 16, 2011*

**Physics**

A solid disk rotates in the horizontal plane at an angular velocity of 0.034 rad/s with respect to an axis perpendicular to the disk at its center. The moment of inertia of the disk is 0.11 kg·m2. From above, sand is dropped straight down onto this rotating disk, so ...
*August 16, 2011*

**Physics**

A 8.49-m ladder with a mass of 24.2 kg lies flat on the ground. A painter grabs the top end of the ladder and pulls straight upward with a force of 247 N. At the instant the top of the ladder leaves the ground, the ladder experiences an angular acceleration of 1.75 rad/s2 ...
*August 16, 2011*

**Physics**

How do I figure out the speed then?
*August 16, 2011*

**Physics**

A 50.3-g golf ball is driven from the tee with an initial speed of 57.0 m/s and rises to a height of 33.2 m. (a) Neglect air resistance and determine the kinetic energy of the ball at its highest point. (b) What is its speed when it is 7.04 m below its highest point?
*August 16, 2011*

**Physics**

A thin rod (length = 1.03 m) is oriented vertically, with its bottom end attached to the floor by means of a frictionless hinge. The mass of the rod may be ignored, compared to the mass of the object fixed to the top of the rod. The rod, starting from rest, tips over and ...
*August 11, 2011*

**Physics**

A 3.0-kg cart is rolling along a frictionless, horizontal track towards a 1.2-kg cart that is held initially at rest. The carts are loaded with strong magnets that cause them to attract one another. Thus, the speed of each cart increases. At a certain instant before the carts ...
*August 5, 2011*

**Physics**

A 3.30-g bullet, traveling at a speed of 492 m/s, strikes the wooden block of a ballistic pendulum, such as that in Figure 7.14. The block has a mass of 232 g. (a) Find the speed of the bullet/block combination immediately after the collision. (b) How high does the combination...
*August 5, 2011*

**Physics**

I am not sure I am understanding this answer. Also if you knew how to do part b
*July 20, 2011*

**Physics**

A 49.9-g golf ball is driven from the tee with an initial speed of 48.8 m/s and rises to a height of 24.0 m. (a) Neglect air resistance and determine the kinetic energy of the ball at its highest point. (b) What is its speed when it is 5.42 m below its highest point?
*July 20, 2011*

**Physics**

Some gliders are launched from the ground by means of a winch, which rapidly reels in a towing cable attached to the glider. What average power must the winch supply in order to accelerate a 163-kg ultralight glider from rest to 27.9 m/s over a horizontal distance of 46.8 m? ...
*July 20, 2011*

**Physics**

A person in a kayak starts paddling, and it accelerates from 0 to 0.498 m/s in a distance of 0.554m. If the combined mass of the person and the kayak is 62.6, what is the magnitude of the net force acting on the kayak?
*July 13, 2011*

**Physics**

A 38.3-kg crate rests on a horizontal floor, and a 74.7 kg person is standing on the crate. Determine the magnitude of the normal force that a) the floor exerts on the crate and b) the crate exerts on the person.
*July 12, 2011*

**Physics**

A planet has a mass of 6.06x 10^23 kg and a radius of 3.99 x 10^6 m. a) What is the acceleration due to gravity on this planet? b) how much would a 72.5 kg person weigh on this plane?
*July 12, 2011*

**Physics**

The 1994 Winter Olympics included the aerials competition in skiing. In this event skiers speed down a ramp that slopes sharply upward at the end. The sharp upward slope launches them into the air, where they perform acrobatic maneuvers. In the women's competition, the end...
*July 9, 2011*

**Physics**

A football player runs the pattern given in the drawing by the three displacement vectors , , and . The magnitudes of these vectors are A = 6.00 m, B = 13.0 m, and C = 15.0 m. Using the component method, find the (a) magnitude and (b)direction of the resultant vector + + . ...
*July 9, 2011*

**math**

adebt of $6000 is to be amortized with 8 equal semiannual payments. If the interest rate is 5%, compounded semiannually, what is the size of each payment
*May 2, 2011*

**5th grade**

whats the gcf of 16 and 42 why
*November 28, 2010*

**English**

As I know a character after which a book is named is an eponymous character,is there a particular word for a symbol after which a book is named? If there is such a word, The Scarlet letter in Hawthorne's The Scarlet Letter, the Mockingbird in Lee's To Kill a ...
*October 16, 2010*

**Business Accounting**

Who can be harmed when a company changes its accounting method to often? why?
*October 2, 2010*

**Chemistry**

How many ions are produced when a formula unit of Li2CO3 is dissolved in water?
*October 2, 2010*

**Math**

5.256 * 10^5
*June 24, 2010*

**algebra**

What would the first 15 counting numbers for base two and base four bases?
*May 12, 2010*

**math**

A diagonal is drawn in a 12-in. square floor tile. Find the sine, cosine, and tangent of the angle formed by the diagonal and a side.
*May 12, 2010*

**math**

The angle of elevation of a 15-ft ladder is 70°. Find out how far the base of the ladder is from the wall.
*May 12, 2010*

**math**

What is 348 in base 6? How do I calculate this?
*May 11, 2010*

**math**

What is 348 in base 6?How do I calculatethis?
*May 11, 2010*

**algebra**

How many sets are subsets of set B? List the subsets of set B. Which are proper subsets? B= {1,2,3,4,5} would it be 5 subsets (1 for each number? the subsets would be 1,2,3,4,5 not sure about a proper subset
*May 10, 2010*

**algebra**

Three pieces of wood are needed for project. They are to be cut from a 90cm long piece of wood. The longest piece is to be 3 times as long as the middle sized piece and the shortest piece is to be 10 cm shorter than the middle sized piece. Can this be done with 2 cuts? If so, ...
*May 9, 2010*

**math**

A total of 129 players entered a single-elimination hand ball tournament. In the first round of play, the top-seeded player received a bye and the remaining 128 players played in 64 matches. Thus, 65 players entered the second round of play. How many matches must be played to ...
*May 9, 2010*

**geometry**

THANKS!!!!! That website was great!
*May 4, 2010*

**geometry**

Draw three different nonconvex polygons. When you walk around a polygon, at each vertex you need to turn either right (clockwise) or left (counterclockwise). A turn to the left is measured by a positive number of degrees and a turn to the right by a negative number of degrees...
*May 4, 2010*