Wednesday

January 28, 2015

January 28, 2015

Total # Posts: 721

**Chemistry**

Compounds can be classified as acids or bases according to _____ different theories.
*January 8, 2011*

**Chemistry**

A .35M solution of a newly synthesized acid, HX, has [H+] of 4.1 x 10^-2. What is the value of Ka for this acid?
*January 8, 2011*

**math**

If p = 2 and q = 8, the value of p^3 + 64 squared ÷ q is _____. All i can say is huh????
*January 5, 2011*

**math**

The names and ages for each person in a family of five follow: Name Dick Jane Kirk Jean Scott Age 40 36 8 6 2 a. What is the mean age? b. Find the mean of the ages 5 yr from now. c. Find the mean 10 yr from now. d. Describe the relationships among the means found in (a), (b), ...
*January 5, 2011*

**math**

Assuming the probability is that a child is a boy and births are independent. What is the probability that if a family will have four children (no twins), they will all be boys?
*January 4, 2011*

**math**

Suppose that a ball is drawn at random from the box (a), its color is recorded, and then the ball is put back in the box. Draw a tree diagram for this experiment and find the probability that the two balls are of different colors.
*January 4, 2011*

**English**

Identify the word in bold type. This car was fixed by the woman WHOSE parents used to live in New York. demonstrative pronoun indefinite pronoun interrogative pronoun relative pronoun not a pronoun
*January 4, 2011*

**Physic**

If the coefficient of static friction for tires on a road is 0.25, at what maximum speed can a car round a level 47.5 m radius curve without slipping?
*January 3, 2011*

**physics**

Im working on this same question too and i cant figure out how you got the .5 when doing 3.6*.866/.5 ??? because i know the answer is correct, is it because the net force goes through the middle?
*January 1, 2011*

**math**

A box contains three white balls and two red balls. A ball is drawn at random from the box and not replaced. Then a second ball is drawn from the box. Draw a tree diagram for this experiment and find the probability that the two balls are of different colors.
*December 27, 2010*

**math**

If 10 is removed from the set of whole numbers, is the set closed with respect to addition? Explain why or why not.
*December 20, 2010*

**english**

how does it meets the promise of the opening of the Declaration's second paragraph, and how it does not.
*December 16, 2010*

**5th grade math**

Using the butterfly method, which fraction is less 1/4 or 1/3 - I know the answer but using the butterfly method the answer does not work out? Am I doing something improper? Thanks!
*November 30, 2010*

**us history**

Some help with this questions would be great....thanks everyone. I would like to say the answer is #1. As president, John Quincy Adams supported... 1.a national bank to promote a uniform currency and to control credit. 2.a strict limit on the powers of the federal government. ...
*November 29, 2010*

**LIT/210**

Thank you very much for the additional information I am certain that this will be useful. Thanks again!
*November 18, 2010*

**LIT/210**

What are some additional methods that I could use during my lit course to write about the literature I will be reading? I need four, but I only could think of two. These are the two I have so far. 1)I have thought about using a reading journal to write down my thoughts and ...
*November 18, 2010*

**Math**

Opps, sorry.. I forgot to write that Maria also has a project worth 4% which she got perfect on
*November 18, 2010*

**Math**

There are four tests in a year. The first test is worth 26%, the second is worth 20%, the third test is worth 30%, and the fourth test is 20%. Maria received a 59% on her first test. To recieve a final mark of 65%, what is the minimum she needs to obtain on each test? Can ...
*November 18, 2010*

**Algebra 2**

Which one is a rule for the nth term of an arithmetic sequence with a8 = 56 and d = 5?
*November 18, 2010*

**Chemistry**

A current of 0.80 A was applied to an electrolytic cell containing molten CdCl2 for 2.5 hours. Calculate the mass (in grams) of cadmium metal deposited. [Enter only numbers in the blank.]
*November 15, 2010*

**Chemistry**

Calculate the cell emf (in volts) for the following reaction at 25°C: Ni(s) + 2 Cu2+(0.010 M) → Ni2+(0.0010 M) + 2 Cu+(1.0 M) [Enter only the number of your answer.] Answer
*November 15, 2010*

**Chemistry**

How many hours will it take to produce 78.0 g of Al metal by the reduction of Al3+ in an electrolytic cell with a current of 2.00 Amperes? [Enter only a number for your answer.]
*November 15, 2010*

**Chemistry**

Consider an electrochemical cell based on the following cell diagram: Pt | Pu3+(aq), Pu4+(aq) || Cl2(g), Cl−(aq) | Pt Given that the standard cell emf is 0.35 V and that the standard reduction potential of chlorine is 1.36 V, what is the standard reduction potential E&...
*November 15, 2010*

**Math**

Six girls each invited a date to the Sadie Hawkins dance. Before they joined in the fun, each couple worked in a different booth. The booths were Popcorn Sales, Marriage, Hayrides, Old Time Photos, Lemonade, and Raffle Tickets. Grab your partner and go round and round with ...
*November 7, 2010*

**statistics in psych**

mouradian (2001) surveyed college students selected from a screening session to include tow groups a) perps b) comparisons...
*November 6, 2010*

**history**

what three things did roosevelt say the country had to do to turn the economy around?
*November 5, 2010*

**science**

an air sample contains 0.046% CO2 if the total pressure is 760mmHg what is the partial pressure of CO2
*November 4, 2010*

**Physics**

A particle travels horizontally between two parallel walls separated by 18.4 m. It moves toward the opposing wall at a constant rate of 9.8 m/s. Also, it has an acceleration in the direction parallel to the walls of 3.7 m/s2.At what angle with the wall will the particle strike...
*October 31, 2010*

**Math**

lisa cut a log into 4 pieces in 6 minutes. she then cut a smaller log into 8 pieces. how long should the job have taken if she worked at the same rate she had worked when cutting the first log? show all work and prove your answer.
*October 31, 2010*

**chemistry**

HOw many calories of heat were produced by the reaction of 10ml water with the powder of two compartments (2x3.23 g) of the heater?
*October 25, 2010*

**Physics**

An object with mass m1 = 6.00 kg, rests on a frictionless horizontal table and is connected to a cable that passes over a pulley and is then fastened to a hanging object with mass m2 = 8.0 kg, as shown in the figure below. Find the acceleration of each object and the tension ...
*October 20, 2010*

**Physics**

Two blocks each of mass m = 4.10 kg are fastened to the top of an elevator as in the figure below. (a) If the elevator accelerates upward at 1.6 m/s2, find the tensions T1 and T2 in the upper and lower strings. T1 ? N T2 ? N (b) If the strings can withstand a maximum tension ...
*October 20, 2010*

**Physics**

A 520 N cat burglar is supported by cables in the figure below. Assume the angle θ of the inclined cable is 32.0°. Find the tension in each cable. (Inclined, vertical, and horizontal)
*October 20, 2010*

**Physics**

A 2.90 kg block starts from rest at the top of a 30° incline and accelerates uniformly down the incline, moving 2.23 m in 1.90 s. (a) Find the magnitude of the acceleration of the block. (b) Find the coefficient of kinetic friction between the block and the incline. (c) ...
*October 20, 2010*

**Physics**

A box slides down a 36° ramp with an acceleration of 1.05 m/s2. Determine the coefficient of kinetic friction between the box and the ramp.
*October 20, 2010*

**Physics**

A 2.90 kg block starts from rest at the top of a 30° incline and accelerates uniformly down the incline, moving 2.23 m in 1.90 s. a) Find the magnitude of the acceleration of the block. (b) Find the coefficient of kinetic friction between the block and the incline. (c) ...
*October 19, 2010*

**Physics**

A block with a mass 4.0 kg is held in equilibrium on an incline of angle θ = 42° by a horizontal force F. a)Find the magnitude of the normal force. b) Find the magnitude of F. (Ignore friction.)
*October 19, 2010*

**Physics**

using this formula i got 8.42, which is not the right answer
*October 19, 2010*

**Physics**

A box slides down a 36° ramp with an acceleration of 1.05 m/s2. Determine the coefficient of kinetic friction between the box and the ramp.
*October 19, 2010*

**Physics**

A 10 kg box is pulled across the floor at a constant velocity of 3.0m/s. If the box is pulled with a force of 40 N, what's the size of the frictional force between the box and the floor?
*October 18, 2010*

**physics**

A car starts from rest and travels along a circular track with a radius of 55.0 meters. The car starts out at a position due East of the center of the track, heading due North initially around the track, which is counterclockwise. The car increases its speed by 105 m/s every ...
*October 18, 2010*

**physics**

A 7000 kg helicopter accelerates upward at 0.70 m/s/s while lifting a 1000 kg car to a mountaintop for a TV commercial photo shoot. -What tension must the cable be able to withstand without breaking?
*October 18, 2010*

**Physics**

A car starts from rest and travels along a circular track with a radius of 55.0 meters. The car starts out at a position due East of the center of the track, heading due North initially around the track, which is counterclockwise. The car increases its speed by 105 m/s every ...
*October 18, 2010*

**Physics**

A 10 kg box is pulled across the floor at a constant velocity of 3.0 m/s. If the box is pulled with a force of 40 N, what is the size of the frictional force between the box and the floor?
*October 18, 2010*

**algebra**

the officejet printer can copy maria's dissertation in 18 min. The laserjet printer can copy the same document in 22 min. If the two machines work together, how long would they take to copy the dissertation?
*October 17, 2010*

**Physics**

Since it's constant, the net force is 0?
*October 15, 2010*

**Physics**

A 20.0 kg crate is pushed across a rough floor for a distance of 90.0 cm. When the force pushing the block is equal to 80.0 N and applied at an angle of 18.0 below horizontal to the block, the block moves at a constant speed of 2.10 m/s. What is the net force on the object?
*October 15, 2010*

**Physics**

A 20.0 kg crate is pushed across a rough floor for a distance of 90.0 cm. When the force pushing the block is equal to 80.0 N and applied at an angle of 18.0 below horizontal to the block, the block moves at a constant speed of 2.10 m/s.
*October 15, 2010*

**psych**

what are the psychoanalytic models? How have these models been used to explain human behavior? Which models do you feel is teh most effective explaining human behavior and why?
*October 6, 2010*

**Business Communication**

#11 B
*September 30, 2010*

**psych**

what does it mean to be empirical in the pursuit of knowledge? how dies this relate to the scientific method?
*September 26, 2010*

**soil mechanics**

a large soil sample obtained from a borrow pit has a wet mass of 26.50kg. the in place volume occupied by the sample is 0.013 m3. a small portion of the sample is used to determine the water content; the wet mass is 135g, and after drying in an oven, the mass is 117g. a) ...
*September 19, 2010*

**Chemistry**

Calculate the amount of water (in grams) that must be added to (a)5.00 g of urea (NH2)2CO in the preparation of a 16.2 percent by mass solution, and (b)26.2g of MgCl2 in the preparation of a 1.5 percent by mass solution.
*September 19, 2010*

**Chemistry**

Explain why ethanol is not soluble in cyclohexane. Also, how do you figure out whether something is polar or nonpolar?
*September 19, 2010*

**chemistry**

In the course of research, a chemist isolates a new compound with an empirical formula C3H3O2. 4.97 g of the compound when dissolved in 100. g of water produces a solution with a freezing point of −0.325°C. What is the molecular formula of the compound? (For water, ...
*September 8, 2010*

**Chemistry**

Consider a 0.70 M solution of Al(NO3)3 in water. What is the nitrate ion concentration in this solution, in units of moles/L?
*September 8, 2010*

**chemistry**

A solution that contains 55.0 g of ascorbic acid (Vitamin C) in 250. g of water freezes at −2.34°C. Calculate the molar mass (in units of g/mol) of the ascorbic acid. Kf of water is 1.86°C/m.
*September 8, 2010*

**chemistry**

What mass of water (in grams) is needed to dissolve 28.7 g of ammonium nitrate NH4NO3 in order to prepare a 0.452 m (molal) solution?
*September 8, 2010*

**statistics**

heights of young adult u.s women are approximatelynormal with mean 64 inches and standard deviation 2.7 inches. What proportion of all u.s. young adult women are taller than 6 feet?
*September 7, 2010*

**Science**

Why do scientists use experimental design?
*September 7, 2010*

**math**

Complete the following ordered pairs for the equation. 4x+5y=-22(_, -2) (2, _)(7, _)
*August 24, 2010*

**college**

i need help to get started with this assignment?
*August 20, 2010*

**Business Communication**

So, is A the correct answer
*August 13, 2010*

**Business Managment**

Whats the correct answer B or D
*August 12, 2010*

**principles of chemistry**

i dont know the answer
*August 8, 2010*

**psych**

thanks again ms. sue! you're the best:)
*August 7, 2010*

**psych**

Can you tell me if I have this right? Are the major schools of psych? Structuralism, Behaviorism, Functionalism, Psychoanlysis, and Humanism? Just want to make sure I have the right ones. Thank you
*August 7, 2010*

**psych**

thank you once again!
*August 4, 2010*

**psych**

how does psych as a scientific discipline differ from casual observations we make in the world in everyday life? what are the similarities? Thanks
*August 4, 2010*

**Accounting**

o What are the advantages of the four different special journals? When would you use each type?
*July 29, 2010*

**college math**

A student makes a 10.50 purchase at the bookstore with a $20.00 bill. The store has no bills and gives the change in quarters and fifty-cent pieces. There are 30 coins in all. How many of each kind are there?
*July 29, 2010*

**college**

The preimeter of a retangle is 98. The length is 7m more than twice the width. Fid the dimension?
*July 29, 2010*

**math**

of a radio show. Each commercial is either 30 seconds or 60 seconds long. If the total comercial time during 1 hour is 13 min, how many 30-second commercials were played that hour? How many 60-second commercials?
*July 27, 2010*

**National Security policy**

What role should American's ideals play in it's National security policy history,current, hypothetical cases
*June 27, 2010*

**math**

1. Consider the following equation. xy + 7x + 5y = –8 (a) Differentiate both sides with respect to x to complete the following. ( blank )y ' + y + blank =0 (b)Solve for y ' in terms of x and y. (c) Calculate dy/dx at the point (4,-4). Can anyone help me on this ...
*June 21, 2010*

**Math**

Thank you!
*June 17, 2010*

**Math**

thank you, But what if the product is something other than -1 Could it still be perpendicular? Why or Why not?
*June 17, 2010*

**Math**

How can you determine if two lines are perpendicular?
*June 17, 2010*

**science**

First, watch the video, than decide which side you are are more inclined to. Either conservation or preservation, and tell why you chose the one you did. (defend your position)
*June 17, 2010*

**math**

No, in order to have a different number of marbles in each of the boxes you would need at least 55 marbles.
*June 17, 2010*

**Science (evolution)**

Thank you, they were helpful.
*June 17, 2010*

**Science (evolution)**

Well so far I found that fossils support his theory, also I have found that a fish study also supports this. I must find two with resources that support this. Although I have already found two, I was wondering if you or anyone else had any ideas?
*June 17, 2010*

**Science (evolution)**

Given Darwin’s Theory of Evolution, what scientific evidence best supports evolution by natural selection?
*June 17, 2010*

**Math**

Thank you again! :0)
*June 9, 2010*

**Math**

What is the difference between domain and range?
*June 9, 2010*

**Algebra**

Thank you.
*June 8, 2010*

**Math**

Thank you! :0)
*June 8, 2010*

**Math**

Thank you. Are there not any linear equations that do not have a slope? What would they be called?
*June 8, 2010*

**Math**

Are all linear equations functions? Why or why not?
*June 8, 2010*

**History**

its a question for a penn foster test ( early faces of western art )
*May 30, 2010*

**Algebra**

Thanks
*May 27, 2010*

**Algebra**

If you replace the equal sign of an equation and put an inequality sign in its place, is there ever a time when the same value will be a solution to both the equation and inequality?
*May 27, 2010*

**science**

what is it because i am in year 7 and if I do not have it I will get 1 hour det
*May 16, 2010*

**Philosophy**

I figured it out thanks anyway. =0)
*April 27, 2010*

**Philosophy**

My text explains the answer to this question, however I do not understand the answer. Instead of posting the entire text I was wondering if anyone could explain this to me in Laymans terms. Thanks. How did financial considerations and the international market affect the pre-...
*April 27, 2010*

**chemistry**

Thank you anonymous and DrBob222!
*April 27, 2010*

**chemistry**

What is the volume of 45.0g of nitrogen monoxide, NO, at 20 C and a pressure of 740 mm Hg? Please someone can check my work is right or not? NO = 14 + 16 = 30 54.0g / 30 = 33.60 L 273K/293K = 0.932 atm 740 mm Hg = 740 torr = 0.974 atm 33.60L x 0.932 x 0.974 = 30.50 L Answer; ...
*April 27, 2010*

**chemistry**

Thank you so much both of you. It really help me to understand. :)
*April 15, 2010*

**chemistry**

How many milliliters of NH3 (at STP) are needed to react with 45.0 mL of NO2 (at STP) according to the equation. Can someone please... help me? 8NO2 (g) + 6NH3 (g) --> 7N2) (g) + 9H2O (g) IS this help? a) 45.0 mL b) 27.5 mL c) 33.8 mL d) 60.0 mL
*April 15, 2010*

**chemistry**

How many milliliters of NH3 (at STP) are needed to react with 45.0 mL of NO2 (at STP) according to the equation. Can someone please... help me? a) 45.0 mL b) 27.5 mL c) 33.8 mL d) 60.0 mL
*April 15, 2010*

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