Saturday

October 10, 2015
Total # Posts: 1,239

**Physics**

A 200g block of copper at 90o C is dropped into 400g of water at 27o C contained in a 300g glass beaker at 27o C. What is the final equilibrium temperature of the mixture? cCu = 0.0924 cal/g°C cglass = 0.2 cal/g°C cwater = 1 cal/g°C
*November 30, 2013*

**Physics**

Gas is confined in a tank at a pressure of 10.0 atm and a temperature of 15o C. If half of the gas is withdrawn and the temperature is raised to 65o C, what is the new pressure of the gas?
*November 30, 2013*

**Physics**

A 1-liter aluminum container at 20o C is filled with 0.975 liters of mercury at 20o C. If both the container and the mercury are heated, at what final temperature will the mercury completely fill the container? (Hint: this is a volume expansion problem) αAl = 24 × ...
*November 30, 2013*

**Physics**

A pair of eyeglass frames made of plastic with a coefficient of linear expansion of 1.30x10-4 (Cº ) -1 have circular lens holes of diameter 4.40 cm at room temp (20º C). To what final temperature must the frames be heated in order to insert lenses 4.42 cm in diameter...
*November 30, 2013*

**Physics**

A 10 kg penguin slips down a rough incline of 35o . If the coefficient of kinetic friction between the penguin and the incline is 0.15, determine the penguin’s acceleration.
*November 20, 2013*

**Physics**

A ball on the end of a string is cleverly revolved at a uniform rate in a vertical circle of radius 85.0cm. If its speed is 4.15 m/s and its mass is 0.300 kg, calculate the tension in the string when the ball is (a) at the top of its path, and (b) at the bottom of its path.
*November 20, 2013*

**Physics**

A Jet plane traveling 1800 km/h (500 m/s) pulls out of a dive by moving in an arc of radius 6.00 km. What is the plane’s acceleration in g’s?
*November 20, 2013*

**Physics**

Mars has a moon (Phobos) with an orbital period of 7.67 hours and an orbital radius of 9.4x106 m. Use Kepler’s 3rdLaw to estimate the mass of Mars.
*November 20, 2013*

**Physics**

A 25 g bullet is fired from a rifle with a barrel of length 65 cm. The bullet starts from rest at one end of the barrel and experiences an average force of 1200 N due to the expanding gases as it moves down the length of the barrel. a) Calculate the work done on the bullet by ...
*November 20, 2013*

**Physics**

Two blocks are attached together with a piece of string. Block #1 (3 kg) slides along a rough horizontal surface and block #2 (2 kg) hangs off the end of the surface. If the blocks accelerate at 2.5 m/s2 in the directions shown, determine the tension in the string and the ...
*November 20, 2013*

**History**

What is the significance of the black stone and where is it located? How did the caravan trade benefit the Arabian peninsula in the fifth and sixth centuries and why did the trade routes change during this time?
*November 13, 2013*

**History**

Identify the changes in the arabian peninsula during the 600's
*November 13, 2013*

**Language Arts**

Can you explain this quote for me???? "weathered many bitter nights"
*November 13, 2013*

**Language Arts**

wait sorry I mean Why is he referred to as "the strategist Odysseus'? To this the strategist Odysseus answered: “My lady goddess, here is no cause for anger. My quiet Penelope-how well I know- Would seem a shade before your majesty, Death and old age being ...
*November 13, 2013*

**Language Arts**

To this the strategist Odysseus answered: Why is he referred to as "the strategist Odysseus'? “My lady goddess, here is no cause for anger. My quiet Penelope-how well I know- Would seem a shade before your majesty, Death and old age being unknown to you, While ...
*November 13, 2013*

**Language Arts**

I got it thank you very much :)
*November 13, 2013*

**Language Arts**

What does this comparison tell you? A gull patrolling between the wave crests of the desolate sea will dip to catch a fish, and douse his wings; no higher above the whitecaps Hermes flew
*November 13, 2013*

**History (Check Answers)**

True or False. 1. Raiding one’s enemies was known in the Quran as the “struggle in the way of God” or jihad. 2.The courage of the Arab soldiers was enhanced by the fact that they had superior weapons to most of their enemies. 3. Mu’awiyah moved the capital ...
*November 11, 2013*

**History**

True or False? The general mu'awiyah was known for one outstanding trait: he used more force than necessary whether it was needed or not
*November 11, 2013*

**Science**

the gravitational force between two objects is proportional to the blank of the distance blank
*November 5, 2013*

**Science**

Fill in the blank- The gravitational force between two objects is proportional to the ______ of the masses of the objects.
*October 30, 2013*

**Language Arts**

Think of some examples of how you change the following elements of a conversation in a formal situation. Vocabulary Pronunciation Abbreviated words Idioms Also give two examples of different situations that require you to use the formal language.
*October 26, 2013*

**physics**

A novice golfer on the green takes three strokes to sink the ball. The successive displacements of the ball are d1 = 4.06 m to the north, d2 = 2.05 m northeast, and d3 = 1.15 m at 30.0° west of south (see the figure). Starting at the same initial point, an expert golfer ...
*September 22, 2013*

**Finance**

On August 1, 2005 you invested $3,000 into a mutual fund. You then invested $1,000 into that same mutual fund on the first day of August for each of the years 2006 through 2013. You averaged a 7.25% annual rate of return on your investment in this mutual fund. What is the ...
*September 20, 2013*

**science**

An astronaut of mass 120 kg recedes from her spacecraft by activating a small propulsion unit attached to her back. The force generated by a spurt is 30 N. Show that her acceleration is 0.25 m/s2.
*September 15, 2013*

**Paleolithic People**

Describe the types of shelter and housing that were used by Paleolithic peoples
*August 28, 2013*

**World History Honors**

Thank you so much!
*August 28, 2013*

**Military History**

Two questions: 1. By 1864, only two Confederate ports remained open and actively participating in blockage running. One of these was: Mobile Charleston Savannah Boston 2. What percentage of Union army enlistments came from the draft? 9 13 15 10
*August 28, 2013*

**Military History**

Who did Lincoln promote to overall Western commander on March 11, 1862? A. Henry Halleck B. William Halsey C. Percy Hobart D. Nathan Forrest
*August 28, 2013*

**Chemistry**

The reaction b/t H2 and O2 yield water vapor and has a change of heat =-484kJ.Ho much PV work is done and what is the value of the change of E in kJ for the reaction of 0.50 mol of H2 with 0.25 mol of O2 amd atmospheric pressure of 1.00 , the volume change is -5.61.
*June 30, 2013*

**math**

the average middle distance runner at a local high school runs the mile in 4.5 minutes with a standard deviation of 0.3 minute the percentage of a runners that will run the mile in less than 4 min is %
*June 30, 2013*

**algebra**

An object 4.2 feet tall casts a shadow that is 12.6 feet long. How long in feet would the shadow be for an object which is 15.3 feet tall?
*June 9, 2013*

**Grammar**

I'm going to high school next year so I wouldn't have her as a teacher again in the future.
*June 5, 2013*

**Grammar**

Thank you so much! :)
*June 5, 2013*

**Grammar**

I want to give my Algebra teacher a letter to show how much her effort on helping me learn made me appreciate her and I just want to know if this sounds okay. Dear (my teacher's name), I just wanted to take some time to express how much I enjoyed being in your class this ...
*June 5, 2013*

**math**

Triangles ABC and DEF are similar. The similarity ratio of to is , AB = 40, BC = 25, and AC = 35. What is the perimeter of ?
*May 22, 2013*

**accounting**

Customer relations are usually part of:
*April 19, 2013*

**Global History**

How did geography both help and hinder the peoples of Africa?
*April 17, 2013*

**Physical Science**

The amount of air above you decreases or increases if you increase or decrease in elevation. The less air above you, the less air pressure pushing down on you.
*April 17, 2013*

**Math**

I don't get this question! Please help. A pizza is divided into 8 slices. Diana eats 1/16 of the pizza in 5 minutes. At this rate, how many slices can she eat in one hour?
*April 3, 2013*

**Algebra**

A company has two printers. Printer A prints a pages per minute, and Printer B prints b pages per minute. When Printer A prints for 3 minutes and Printer B prints 5 minutes, a total of 70 pages are printed. When Printer A prints for 6 minutes and Printer B prints for 9 minutes...
*March 31, 2013*

**Algebra**

Using the substitution method, what is the value of a in the solution to the system of equations below? a=3b+7 4a+9b=70
*March 31, 2013*

**Social Studies**

To break away from
*March 28, 2013*

**Physics**

What are two types of waves
*March 25, 2013*

**Forces (Science)**

Describe 2 contact and 2 non-contact force examples. Please and thank you very much. :)
*March 22, 2013*

**Forces (Science)**

What slope would a person have on a distance-time graph if they were speeding, slowing down, or not moving at all?
*March 22, 2013*

**Chemistry (2 questions)**

1. What kinds of bonds will most likely form from groups 1,2,3,6,7, and 8 on the periodic table? 2. What kinds of bonds will most likely form from group 4 on the periodic table?
*March 22, 2013*

**maths**

WHATEVER
*March 20, 2013*

**maths**

EIGHT DAYS
*March 20, 2013*

**maths**

12 MEN AT A CAMP HAVE FOOD TO LAST 10 DAYS. IF 3 MEN JOIN THE CAMP.HOW LONG WILL THE FOOD LAST?
*March 20, 2013*

**chemistry**

What is the amount of H2O that can be produced by combining 89.7 of each reactant in the following equation: 4NH3(g) + 5O2 (g)----> 4NO(g) + 6 H2O(g)
*March 15, 2013*

**pos and neg inf limits**

sorry what is O, i dont understand
*March 13, 2013*

**pos and neg inf limits**

Help with this please?
*March 13, 2013*

**pos and neg inf limits**

x-> + infinity (x-sqrt(x^2-3x)) for this i got 3, because after it is rationalized i got 3x/x= 3 x-> - infinity (3x^2+4x+2)/(5-x+x^3) i got 3/x , and zero as the final answer are they right. thank you.
*March 13, 2013*

**Absolute Value and Limits**

Help with this one ?
*March 13, 2013*

**Absolute Value and Limits**

solve for limits of 1+ and 1- for this function: (x^2 + abs (x-1) - 1)/ abs (x-1) i dont know how to simplify abs. value expression times polynomial. can someone please help.
*March 13, 2013*

**calculus**

i dont get why you would multiply the numerator by that. please explain
*March 13, 2013*

**calculus**

as x-> + infinity (limit) 3x^4-2x^2/x^4+5x^2 i got positive infinity. is this right
*March 13, 2013*

**Calculus **

I know how to do this problem, but I'm stuck at the arc length differential. Set up an integral for the arc length of the curve. (Do not evaluate the integral) x=y^2ln(y), 1<y<2 dx/dy = 2yln(y) + y ds= sqrt (1 + (2yln(y)+y)^2 so far I have sqrt (1 + 4y^2ln(y) + 2[2y^...
*February 28, 2013*

**Science**

in what ways do you think earth's moon may be similar to mercury
*February 23, 2013*

**math $$**

k ty i have 4 more *so sorry* Carson wanted to make a cylindrical pillow for his mother's b-day the pillow was to be 15 inches long with a diameter of 6 inches and would be filled with stuffing. determine how many cubic inches of stuffing carson will need to make the ...
*February 21, 2013*

**math $$**

k ty i have 4 more *so sorry* Carson wanted to make a cylindrical pillow for his mother's b-day the pillow was to be 15 inches long with a diameter of 6 inches and would be filled with stuffing. determine how many cubic inches of stuffing carson will need to make the ...
*February 21, 2013*

**math $$**

ok but that is not one of the answers and it can't be reduced
*February 21, 2013*

**math $$**

ty sooooo much another question (sorry about all these just trying to get this done and learn it before tom.) Jennie calculated the probabilities of various events involving a coin. What is the probability of a coin landing on heads at least twice when the coin is flipped ...
*February 21, 2013*

**math $$**

sorry knights my computer was messying up so...
*February 21, 2013*

**math $$**

The graph of 5x-2y=10 intersects the x-axis and y-axis what are the order pairs for these two points of intersection? A.(2,0) and (0,5) B.(2,0) and (0,-5) C.(-2,0) and (0,5) D.(-2,0) and (0,-5)
*February 21, 2013*

**math $$**

again sorry did it again
*February 21, 2013*

**math $$**

ty sooooo much another question (sorry about all these just trying to get this done and learn it before tom.) Jennie calculated the probabilities of various events involving a coin. What is the probability of a coin landing on heads at least twice when the coin is flipped ...
*February 21, 2013*

**math $$**

The graph of 5x-2y=10 intersects the x-axis and y-axis what are the order pairs for these two points of intersection? A.(2,0) and (0,5) B.(2,0) and (0,-5) C.(-2,0) and (0,5) D.(-2,0) and (0,-5)
*February 21, 2013*

**MATH PLZ**

ty both so much
*February 21, 2013*

**MATH PLZ**

Which is true when a negative nuber is subtracted from a positve number? A.the difference is always 0 B.the difference is always positive C.the difference is always negative D.the difference could be negative or positive *i need examples to
*February 21, 2013*

**Math plz fast i really need it**

i don't get it can you explain it better plz
*February 21, 2013*

**Math plz fast i really need it**

neither mind but can u help with the second
*February 21, 2013*

**Math plz fast i really need it**

okay but can you expain it better plz
*February 21, 2013*

***math***

The graph of 5x-2y=10 intersects the x-axis and the y-axis what are the ordered pairs for these two pairs of intersection A.(2,0) and (0,5) B. (2,0) and (0,-5) C.(-2,0) and (0,5) D. (-2,0) and (0,-5)
*February 20, 2013*

**Grammar**

one last question sorry: Which is correct? (1) He took the news bad. (2) He took the news badly.
*February 19, 2013*

**Grammar**

what prefix turns the word "town" into a word meaning "center of town"?
*February 19, 2013*

**early childhood education**

A poem that does not ryme is called: a. free verse. b. narrative. c. a lyric. d. nonfiction.
*February 15, 2013*

**solar system**

which planet has enough gravity to hold on to most gases?
*February 13, 2013*

**space science**

What other challenges do you think there would be for engineers designing a spacecraft to travel to mercury?
*February 7, 2013*

**math**

Yes it is
*February 7, 2013*

**social studies**

people how developed th caste system
*January 14, 2013*

**Math**

Oh okay thank you
*January 7, 2013*

**Math**

When we are plotting something, does the y axis go first or the x axis?
*January 7, 2013*

**Psychology**

Sorry....B should say B. psychodynamic therapy and humanist therapy D. family intervention therapy and behavioral skills training
*January 3, 2013*

**Psychology**

Gayla's treatment for bulimia and binge eating has been highly successful. It is most likely that her treatment involved a combination of: A. cognitive therapy and behavior therapy B. psychodynamic therapy and behavioral skills training C. systematic desensitization and ...
*January 3, 2013*

**psychology**

At the age of four months, Zach was excitable and fearful. His dad taped a colorful picture beside the changing table to entertain Zach during diaper changes. Zach overreacted to the picture and became agitated and nervous. During his school years, Zach is most likely to: A. ...
*January 3, 2013*

**Math**

6/2(1+2)=
*January 2, 2013*

**psychology**

To ensure that the memory of a child is accurate, it is important to: A. ask him to draw a picture of the event B. reward him for telling what happened C. reassure him that his friends have had the same experience D. avoid the use of leading questions or suggestion
*January 2, 2013*

**Math**

A gas tank is 1/4 full. Abby adds 4 gallons and now it is 5/8 full. How many gallons does the tank hold?
*December 11, 2012*

**Math**

The line L has equation of 4x + 3y = 7. Find the equation of the line perpendicular to L which passes through the point of intersection of L and the y-axis. Give answer in ax + by + c = 0.
*December 9, 2012*

**statistics**

What is the z-score for a test score of 440 in which the test has a normal distribution of N(400, 50)?
*December 4, 2012*

**Advanced Accounting**

GAAP rules are clear about when a company needs to consolidate or not, but companies tend to find loopholes to circumvent this rule. GAAP clearly indicates that consolidated financial statements are “usually necessary for a fair presentation when one of the companies in ...
*December 3, 2012*

**Advanced Accounting**

Mr. White (invested $20,000) and Mr. Black (invested $10,000) are in a partnership to run a marketing firm. They share profits and losses in the ratio of 2:1, which is also the ratio of their initial investment in the business. Mr. White manages the office but Mr. Black gets ...
*December 3, 2012*

**Advanced Accounting**

Mr. Right and Mr. Wrong own an antique store in a partnership. They share profits and losses equally and receive an annual salary of $50,000, as per the partnership agreement. Mr. Right travels the country buying antiques. Mr. Wrong manages the store. From time to time, they ...
*December 3, 2012*

**Science**

The process of changing free nitrogen gas into a usable form of nitrogen is called?
*December 2, 2012*

**Algebra**

q+2/5 = 2q-11/7
*December 2, 2012*

**physics**

The hot reservoir for a Carnot engine has a temperature of 926 K, while the cold reservoir has a temperature of 441 K. The heat input for this engine is 3730 J. The 441-K reservoir also serves as the hot reservoir for a second Carnot engine. This second engine uses the ...
*December 1, 2012*

**physics**

The wattage of a commercial ice maker is 226 W and is the rate at which it does work. The ice maker operates just like a refrigerator and has a coefficient of performance of 3.90. The water going into the unit has a temperature of 15.0°C, and the ice maker produces ice ...
*December 1, 2012*

**physics**

After 6.00 kg of water at 80.4 oC is mixed in a perfect thermos with 3.00 kg of ice at 0.0 oC, the mixture is allowed to reach equilibrium. When heat is added to or removed from a solid or liquid of mass m and specific heat capacity c, the change in entropy can be shown to be...
*December 1, 2012*