Tuesday

December 1, 2015
Total # Posts: 196

**Physics**

W have three air carts (labeled #1, #2, and #3) on an air track. The carts are equipped with spring bumpers so that all collisions are elastic. The masses of the carts are m1 = 5m, m2 = 2m, and m3 = m. Initially, cart #1 is given a velocity to the right of magnitude v0 and the...
*October 25, 2015*

**science **

What would you estimate to be the speed of a galaxy located 60 million light-years away?
*October 2, 2015*

**Math**

The perimeter of a square must be greater than 104 inches but less than 150 inches. Find the range of possible side lengths that satisfy these conditions. (Hint: the perimeter of a square is given by P=4s, where s represents the length of a side).
*September 2, 2015*

**Chemistry**

The reaction of NO and O2 produces NO2. 2 NO(g) + O2(g) „_ 2 NO2(g) The reaction is second-order with respect to NO(g) and first-order with respect to O2(g). At a given temperature, the rate constant, k, equals 4.7 x 10^2 M^¡V2s^¡V1. What is the rate of ...
*February 18, 2015*

**Chemistry**

For a certain reaction, the activation energy is 52.1 kJ/mole. By what ratio will the rate constant change if the temperature is decreased from 175C to 75C?
*February 18, 2015*

**Math**

I'm really confused on these two. Can someone help explain this to me? Thanks! :) 1.) What values of u are not permissible in the expression csc(u)tan(u)? 2.) What values of u are not permissible in the expression sin(u)cot(u)?
*February 3, 2015*

**Math**

I'm really confused on these two. Can someone help explain this to me? Thanks! :) 1.) What values of u are not permissible in the expression csc(u)tan(u)? 2.) What values of u are not permissible in the expression sin(u)cot(u)?
*February 3, 2015*

**physics**

A ball is shot out of a spring and into a hollow ballast which then swings upwards 2.5 cm. The ball has a mass of 0.10 kg, the ballast has a mass of 0.50 kg and the spring constant is 500 N/m. How fast was the ballast-ball system moving immediately after impact? How fast was ...
*November 5, 2014*

**Chemistry**

what mass of nitrogen gas is required to react completely with 2.79 of hydrogen gas to produce ammonia?
*October 30, 2014*

**Math**

The centre of a doughnut is removed and formed to make a sphere of dough with diameter 2.5 cm. A batch of these spheres is to be covered in a sugar glaze. There is enough glaze to cover an area of 4710 cm^2. How many spheres can be glazed?
*October 19, 2014*

**Math**

A right pyramid has a surface area of 258 cm2. A right cone has a base radius of 4 cm. The cone and pyramid have equal surface areas. What is the height of the cone to the nearest tenth of a centimetre?
*October 13, 2014*

**Math**

You have a 5/16 in. drill bit. Will it drill a hole large enough to fit a 5 mm bolt? Show two different ways to answer this question. Explain your thinking. I couldn't even figure out the first way. Please help!
*October 6, 2014*

**Math**

The height of a pop can is 15 cm and its shadow is 20 cm long. A carton of milk next to the can is 0.25 m tall. Determine the length of the carton's shadow, to one tenth of a centimeter. I did 100cm*0.25... but the answer is 33.3cm How did they get that?
*October 6, 2014*

**Math**

A regulation baseball bat must be 2/3/4 inches or less in diameter and shorter than 42 inches long. Which bat would not be allowed? a)diameter 6cm b) length 0.9m c)diameter 7m d)length 1.0668m d?
*October 4, 2014*

**Math**

Convert 86 inches to yards, feet, and inches? Why the inches again?
*October 4, 2014*

**Math**

Scarlet-Camille needs three lengths of wood to finish a project. She needs one piece measuring 148 cm, one piece measuring 38 cm, and one piece measuring 42 cm. Every time Scarlet-Camille cuts a length of wood she loses 3 mm of wood. If Scarlet-Camille can only purchase lumber...
*October 4, 2014*

**Math**

-80=8b-15+5b How do I solve this and what does check mean?
*October 4, 2014*

**Math**

But how did they get that answer? I want to know how to do it.
*October 1, 2014*

**Math**

One hundred sixty acres is a square with a side length of one-half a mile. How many hectares are in one square mile?
*October 1, 2014*

**Math**

An electrician was hired to run the wires for a surround-sound stereo speaker system. She purchased 2 rolls of 14-gauge speaker wire. Each roll contains 4 m of wire. For each of 2 speakers, 2 ft. of wire are required. For each of the other 2 speakers, 11 ft. of wire are ...
*October 1, 2014*

**Math**

Convert 2yd, 2ft, 5in. to centimeters. Convert 10yd,1ft, 7in. to meters. I tried it twice but still didn't get it right. Please help me out.
*September 30, 2014*

**Science**

Suppose a geologist is studying two distinct areas next to a spreading ridge. The magnetic direction of the minerals in the oldest area is opposite to the magnetic direction of minerals in the newest area. a) Which area is closest to the center of the ridge, the older of the ...
*September 27, 2014*

**Physics**

A box is given a push so that it slides across the floor. How far will it go, given that the coefficient of kinetic friction is 0.25 and the push imparts an initial speed of 6.0m/s?
*September 25, 2014*

**Math**

Convert 62 inches to yards, feet, inches? How do I do all three at once? Please help.
*September 24, 2014*

**Math**

Simplify. (a) 2^3(5)^-2 =? (b) 2^-3/a^4 = 2^3a^4 =8a^4????
*August 7, 2014*

**Math**

How do I find the greatest common factor of 54, 81, and 135? I don't understand the tree diagram either. :(
*August 1, 2014*

**Math**

Kevin and Rob are standing on opposite sides of Edmonton's River Valley. In order to see a boat on the river, Kevin has to look down 32°, and Rob has to look down 38°. The width of the valley is 750m, and the boat is exactly between Kevin and Rob. How much higher ...
*July 27, 2014*

**Algebra2**

What is the common ratio of the geometric sequence whose second and fourth terms are 6 and 54, respectively?
*July 24, 2014*

**Algebra 2**

The test scores for a math class are shown below. 81,84,82,93,81,85,95,89,86,94 What is the standard deviation of the data set? Roun your answer to the nearest tenth 4.9 5.5 5.3 5.1
*May 19, 2014*

**chemistry**

Assuming that the volumes of carbon diox- ide and of propane are measured under the same experimental conditions, what volume of carbon dioxide is produced by the complete combustion of 20 L of propane? i just dont understand
*March 15, 2014*

**chemistry **

A sample of hydrogen at 50◦C exerts a pressure of 0.377 atm. The gas is heated to 61◦C at constant volume. What will its new pressure be? how do i find the pressure? i dont understand!!!!!!!!!!!
*March 9, 2014*

**language arts (check answer)**

C is the correct answer. Good job.
*March 5, 2014*

**Chemistry**

How much would the boiling point of water increase if 4 mol of sugar were added to 1 kg of water (Kb=0.51C/(mol/kg)for water and i=1 for sugar)?
*March 4, 2014*

**Chem**

What is the oxidation half-reaction for Mg(s)+ZnCL2(aq)>MgCL2(aq)+Zn(s)?
*February 27, 2014*

**English**

Anyone is the correct answer. You're right, "no one" is a double negative
*February 27, 2014*

**English**

Yes. The answer would be anything. "She hasn't said nothing about her accident" doesn't really make sense.
*February 27, 2014*

**Chemistry**

If 507 g FeCL2 were used up in the reaction FeCL2 + 2NaOH > Fe(OH)@(s) + 2NaCL, how many grams of Fe(OH)2 would be formed?
*February 27, 2014*

**Physics**

A skateboarder, with an initial speed of 2.6m/s , rolls virtually friction free down a straight incline of length 18m in 3.3 s. What angle is the incline plane?
*October 8, 2013*

**Quatitative Analysis**

What is the correct charge balance equation for an aqueous solution of MnCl2 that ionizes to Mn2 , Cl–, MnCl , and MnOH ? What is the correct mass balance equation for the same solution?
*September 17, 2013*

**Life Science**

If a sponge (from the ocean, not a cleaning sponge. :P) were torn apart by a predator, what would happen?
*May 6, 2013*

**poetry**

In this unit, you read William Wordsworth’s poems “Lines Composed a Few Miles Above Tintern Abbey,” “The World is Too Much with Us,” and “I Wandered Lonely as a Cloud.” How are these poems representative of the Romantic Period?
*February 26, 2013*

**Chemistry H**

70
*February 24, 2013*

**Chem help asap**

A 890 mL NaCl solution is diluted to a volume of 1.15 and a concentration of 8.00 . What was the initial concentration? How do I go about this? M1V1=M2V2? and if it is how do I replace the variables?
*November 14, 2012*

**Science- Chemistry**

How do I figure these out? A solution of sodium thiosulfate, Na2S2O3, is 0.1365 M. 29.28 mL of this solution reacts with 39.79 mL of I2 solution. What is the molarity of the I2 solution? 2(Na2S2O3) + I2↔Na2S4O6 + 2(NaI) 16.77 mL of the I2 solution from above is required...
*November 8, 2012*

**Spanish check**

C. La vida de dos estudiantes. Complete each sentence with the correct form of the verb in parentheses. 1. Rodrigo y su novia estáis (estar) despiertos a las siete de la mañana. 2. Ella prepara (preparar) el café y, a las ocho de la mañana, los dos ...
*September 23, 2012*

**Spanish check**

C. La vida de dos estudiantes. Complete each sentence with the correct form of the verb in parentheses. 1. Rodrigo y su novia estáis (estar) despiertos a las siete de la mañana. 2. Ella prepara (preparar) el café y, a las ocho de la mañana, los dos...
*September 23, 2012*

**Spanish check**

C. La vida de dos estudiantes. Complete each sentence with the correct form of the verb in parentheses. 1. Rodrigo y su novia estáis despiertos a las siete de la mañana. 2. Ella prepara el café y, a las ocho de la mañana, los dos tomamos el desayuno...
*September 23, 2012*

**Spanish CHECK**

(On the contrary). Flor is describing the courses she is taking, but you have an entirely different point of view. Complete each sentence, using the opposite of the word in italics. ¡OJO! Remember that adjectives must agree in number and gender with the noun they ...
*September 22, 2012*

**writing**

how do i rewrite the paragraph using first person plural when referring to the readers, and third person plural nouns and pronouns in referring to those being judged. In the story, "The Valiant Woman" by J. J. Powers, we find that in judging people we overlook most ...
*September 14, 2012*

**Stats**

what are the upper and lower limits of the variable below? upper lower 15-19 60-69 * is there a formula i need to use for this.
*September 12, 2012*

**chemistry**

the diameter of a helium atom is about 1*10^2pm.suppose that we could line up helium atoms side by side in contact with one another. aproximately how maney atoms would it take to make the distance from end to end 1cm ?
*September 7, 2012*

**statistics**

Reading placement scores for a particular college are normally distributed with a mean of 72 and a standard deviation of 7. a) draw a sketch of the reading placement scores for students at this college. be sure to mark the mean and also to mark one and two standard deviations ...
*June 3, 2012*

**Earth Science**

Water
*April 26, 2012*

**Biology 1010**

True or False The air flow in the respiratory system of birds is similar to that of mammals.
*April 18, 2012*

**Biology 1010**

Which of following is NOT characteristics of all fish? a.gills as respiratory organs b.two-chambered heart c.swim bladder for buoyancy organ d.skin with scales e.presence of jaws
*April 18, 2012*

**Chemistry**

Henderson-Hasselbalch equation: pH=pKa+log((base)/(acid)) Kb*Ka=1.0*10^-14 1.74*10^-5*Ka=1.0*10^-14 Ka=1.0*10^-14/1.74*10^-5 Ka=5.75*10^-10 pKa=-log(5.75*10^-10) pKa=9.24 pH=9.24+log((.246)/(.0954)) pH=9.65
*April 15, 2012*

**Visual Arts**

1.Using the conventional color wheel, name two PAIRS of complementary colors. This means at least 4 colors. When you put complementary colors next to each other, What is the visual effect? 2. Describe the difference between visual texture and actual texture in art. Give some ...
*April 12, 2012*

**algebra**

least common denominator for these two rational expressions. ( / stands for fraction bar and the ^ means it's squared. i don't understand these at all. a/ a^2-36 2a/a^2+5a-6
*February 28, 2012*

**Early American Literature**

I had to read an excerpt from Ralph Waldo Emerson's "Self-Reliance". My assignment is to answer uestions about it. The uestion I am stumped on is: How important is Emerson's use of the adjective "foolish" in his discussion of consistency?
*February 22, 2012*

**Chemistry**

What will be the concentration if 52 milliters of a solution that is 12 parts per million in sodium chloride is diluted with enough water to make 97 millilters of solution?
*February 14, 2012*

**Chemistry**

How many grams of potassium phosphate must be dissolved in 3.75 Liters of water to produce a soltuion that contains 8*10^23 potassium ions?
*February 14, 2012*

**Physics**

Also, what is the constant acceleration do you need to catch her at the finish if she maintains a constant speed?
*January 30, 2012*

**Physics**

You are keeping pace with another runner, at 4 minutes per mile, but are 16 m behind her when she is 130m from the finish line.At what pace will you be running at the finish? *Express your answer using two significant figures.
*January 30, 2012*

**College Physics**

To drwls v2= vo2+ 2a(x-x0)
*January 30, 2012*

**College Physics**

If you square the equation v=v0 + at, you'll have an expression for v2. Equate the two expressions for v2, and show that the resulting equation reduces to the equation x= x0+v0t + 1/2at2.
*January 30, 2012*

**Statistics: Draw A Scatterplot**

Draw a scatterplot indicating a strong negative relationship between the variables of income and mental illness
*October 18, 2011*

**Physics**

The tallest volcano in the solar system is the 29 km tall Martian volcano, Olympus Mons. An astronaut drops a ball off the rim of the crater and that the free fall acceleration of the ball remains constant throughout the ball’s 29 km fall at a value of 4.1 m/s2. (We ...
*October 13, 2011*

**Physics (3)**

The mass m=1.00 kg is set up as a pendulum of length 0.6m . Initially in the position of h=0.2 m above the lowest point, and the pendulum is given initial speed of 1.00 m/s. What is the largest mass M that could be temporarily lifted in such setup?
*October 13, 2011*

**Physics (2)**

If it takes 4.00 J of work to stretch a Hooke's Law spring 10.0 cm from its unstressed length, determine the extra work required to stretch it an additional 10.0 cm
*October 13, 2011*

**Physics - 2**

A single bead can slide with negligible friction on a wire that is bent into a circular loop of radius 15.0 cm, as in Figure P6.68. The circle is always in a vertical plane and rotates steadily about its vertical diameter with (a) a period of 0.450 s. The position of the bead ...
*October 6, 2011*

**Physics - 1**

An amusement park ride consists of a large vertical cylinder that spins about its axis fast enough that any person inside is held up against the wall when the floor drops away (Fig. P6.65). The coefficient of static friction between person and wall is μs, and the radius ...
*October 6, 2011*

**calculus - limits**

Does the limit lim 2011t/3-(squareroot)t+9 exist ? t-0
*October 4, 2011*

**physics - 1**

By algebraic manipulation of the first two kinematic equations for one-dimensional motion: 1) vf = vi + at 2) xf = xi + (vi)(t) + (1/2)(a)(t)^2 Obtain the other two kinematic equations : 3) vf^2 - vi^2 = 2ax 4) xf = xi + (1/2)(vi + vf)t
*September 22, 2011*

**Physics**

A car travels in a flat circle of radius R. At a certain instant the velocity of the car is 24 m/s west, and the total acceleration of the car is 2.5m/s^2 53 degrees north of west. Find the radial and tangential components of the acceleration of the car at that moment. If the ...
*September 22, 2011*

**Physics**

The projectile motion is fired with velocity of magnitude vo at the angle feta. Find feta for which the maximum elevation of the projectile is twice its range
*September 22, 2011*

**Physics**

The projectile motion is fired with velocity of magnitude vo at the angle feta. Find feta for which the maximum elevation of the projectile is twice its range
*September 22, 2011*

**math**

simplify 5d+3(2-3d)
*June 1, 2011*

**English**

8. Name three specific "poet stereotypes" that Margaret Atwood discusses or hints at in her speech. 9. What were Margaret Atwood's very first poetry experiences? 10. What are your earliest memories of poetry? Were they similar to Margaret Atwood's first ...
*May 10, 2011*

**chem**

What mass of KCl (MM = 74.55 g/mol) is required to make 600 mL of a 0.175 M solution
*April 12, 2011*

**chemistry**

A 375 g piece of iron was heated to 975 °C and then quenched in a bucket containing one gallon of water at 20 °C. What was the temperature of the water after the iron and the water came to thermal equilibrium?
*April 10, 2011*

**chemistry**

A 375 g piece of iron was heated to 975 °C and then quenched in a bucket containing one gallon of water at 20 °C. What was the temperature of the water after the iron and the water came to thermal equilibrium?
*April 10, 2011*

**Genetics**

In cats the allele B produces black, whereas b produces yellow. Neither gene is dominant, and in the heterozygous state the phenotype is a combination of yellow and black spots called tortoise-shell. The alleles B and b are “X-Linked”. If a tortoise-shell cat has ...
*April 5, 2011*

**Biology**

The gene for fur color in rabbits is an incompletely dominant situation: BB rabbits are brown, Bb rabbits are grey, and bb rabbits are white. The gene for fur color distribution is however co-dominant. This gene, S, has two alleles, S1 and S2; S1S1 animals have stripes only; ...
*April 5, 2011*

**Biology**

In Siberian Huskies base fur color is represented by black & white fur BB, tan/yellow & white fur Bb, and white only fur bb. Siberians all posses two style of fur wire hair (W_) and smooth (ww). What would the genotype and phenotype frequencies be for a true breading white ...
*April 5, 2011*

**Biology**

. A woman whose father was color blind (X-linked, recessive) and who has type A blood has accused a man who is himself color blind of fathering her child. The accused man has type B blood. For each of the following cases, indicate whether or not the man might be the father. ...
*April 5, 2011*

**Gen499**

Improvements to the environment brought about through the politicians’ public support of environmental regulations more than offset the damage done to the environment by the politicians’ private planes.
*April 5, 2011*

**Finance**

3. Your firm is considering buying a new machine that costs $200,000, is expected to generate $110,000 in new revenue each year and will cost $45,000 a year to operate. If your firm's marginal income tax rate is 35% what is the Net Cash Flow your firm will realize from the...
*February 23, 2011*

**A Level Law **

He should have been read his Miranda rights, and should exercise his rights. He should only ask for an attorney. Yes he is adequately protected, again, so long as he does not vacate his rights, and also how he is handled will be dependent upon his actions, reactions, behavior...
*February 23, 2011*

**HRM 240**

k thank you for your help i really appreciate it.
*February 11, 2011*

**HRM 240**

thank you. one other thing is how do i set it up in apa format i have never understood how to do that by reading it on the school webpage it never makes since to me.
*February 11, 2011*

**HRM 240**

Final Project paper. how do i go about setting up my paper to make sure i discuss all of the things that are being asked of me for my final paper.
*February 11, 2011*

**math**

What are all the angles in each garden if there are two similar squares
*February 9, 2011*

**Physics**

Find the average velocity over the time interval from 1 to 3 seconds. Express your answer in meters per second to the nearest integer.
*January 30, 2011*

**geometry**

If a pentagon has a side of 140, how many inches is the rest of the side?
*January 26, 2011*

**Science**

Which of the four compounds contains a metal? HC2H3O2 CaCO3 C3H8 CO2
*January 5, 2011*

**geometry**

Many younger children like to play a game similar to baseball called tee-ball. To accommodate the younger children, the bases are only 40 feet apart in a square-shaped field. Find the distance between home plate and second base in tee-ball. If necessary, round your answer to ...
*January 3, 2011*

**geometry**

If Quadrilateral QRST is a parallelogram, which is not necessarily true? a. Opposite angles are congruent. b. The diagonals bisect each other. c. Angles are four right angles. d. Consecutive angles are supplementary.
*January 2, 2011*

**geometry**

The two diagonals of a rhombus are 16 inches and 12 inches long. What is the perimeter of the rhombus? Round to the nearest inch, if necessary. a. 28 in b. 40 in c. 56 in d. 66 in
*January 2, 2011*

**Spanish for Whitney**

The teacher wont help me out at all. She only tells me to go back and review the lesson. I did. It don't work.
*December 9, 2010*

**spanish**

Forming the pretérito imperfecto In AR verbs the pretérito imperfecto is formed by dropping the ending and adding aba, abas, aba, ábamos, and aban. Lets look at hablar as an example: Infinitivo: HABLAR Pretérito Imperfecto yo hablaba nosotros habl&...
*December 8, 2010*