Sunday

August 28, 2016
Total # Posts: 943

**Chemistry**

DrBob222,HELP! Two 20.0-g ice cubes at –10.0 °C are placed into 275 g of water at 25.0 °C. Assuming no energy is transferred to or from the surroundings, calculate the final temperature of the water after all the ice melts. heat capacity h2o (S)=37.7 j/mol*k heat ...
*September 11, 2012*

**Chemistry**

Two - 20.0 g ice cubes @ -20 degrees C are placedinto275 g of water @ 25 degrees C. Assuming no energy is transfered to or from the surroundings caculate the final temperature of the water after the ice melts.
*September 10, 2012*

**Chemistry**

Calculate the heat energy release when 29.7 g of liquid mercury @ 25.00 degrees C is converted to solid merury at its melting point.
*September 10, 2012*

**Math**

Find the unknown digit to make the sentence true 2.48>2.4__ 1>2.463 5.723<5.72__ <5.725 7.64<7.___ 5<7.68
*September 10, 2012*

**chemistry**

(M1)(V1)=(M2)(V2) convert all moles to grams and mL to L 25mL=0.025L 1.04M (0.025L)=M2 (0.500L) 0.026=M2 (0.5L) (0.026)/(.5L)=M2 M2=0.052M NaCO3
*September 6, 2012*

**chemistry**

What volume of 2.50 x 10-4 M CV+ solution should be diluted to 10.0 mL to prepare a 7.50 x 10-5 M CV+ solution
*September 3, 2012*

**Science**

a .5kg ball is dropped from a 30m high building is on the ground for 2ms then bounces up 20m. What avg force was exerted on the ball?
*August 23, 2012*

**Physics**

A .5kg ball is dropped from a 30m high building is on the ground for 2ms then bounces up 20m. What avg force was exerted on the ball?
*August 23, 2012*

**7th grade pre algerbra**

18 necklaces
*August 8, 2012*

**MAth!**

In the list of five measurements shown below, one is blurred. Supply a fifth value that would make the median 8. 8 5 10 3 #
*July 28, 2012*

**Math-one more**

The average length of time, per week, that students at a certain university spend on homework is normally distributed with a mean of 24.3 hours and a standard deviation of 1.4 hours. Jane tells her parents she spends more time studying than 75% of the students on campus. How ...
*July 28, 2012*

**Math**

In the list of five measurements shown below, one is blurred. What must this value be, if the mean of the five measurements is 7? 8 5 10 3 #
*July 28, 2012*

**English help**

1c 2? 3b 4c 5c 6d 21a 22c 23d 24b 25c
*July 25, 2012*

**English help**

Question 1 Marks: 1 Davey has decided to research the history of fire engines in America. To get started he's written a list of research questions. Which of the following questions is the best research question for him to ask? a. Who holds the patent for the fire engine? b...
*July 25, 2012*

**English help**

1 Which of the following is NOT part of the process of synthesizing? a. finding main ideas b. finding supporting details c. determining a purpose d. comparing and contrasting ideas is it c?
*July 25, 2012*

**English help**

11a 12c 13b 14a c d e 15a c g 16b c d 17d 18c 19e 20c 21d 22a 23b 24a 25b
*July 25, 2012*

**English help**

1a 2d 3a 4c 5d 6a how about now?
*July 25, 2012*

**English help**

Are these right? 1.c 2.b 3.d 4.a 5.c 6.c 7.a 8.b 9.d 10.c 11.a 12.d 13.b 14.d 15.a 16.c 17.b 18.a 19.d 20.a 21.c 22.d 23.a 24.b 25.c
*July 25, 2012*

**English help**

Question 1 Marks: 1 A common theme that runs through all the sections of Song of Myself is Whitman's own — Choose one answer. a. belief in his power as a poet b. love of solitude c. inability to trust people d. failure to change the world Question 2 Marks: 1 Free ...
*July 25, 2012*

**elem math core**

An unknown number of slips of paper, each with the letter C written on them, are added to the bag. After this, it is known that P(A)=¼ and P(B)= ¹/6. Find P(C).
*July 11, 2012*

**elem math core**

A bag contains one each of red, blue, green, yellow and white marbles. Give the sample space for the following experiments. A) one marble is drawn at random B) one marble is drawn, but not replaced,and then a second marble is drawn.
*July 11, 2012*

**Statistics and Probability**

I had a problem similar to this that we did in my math class. Our teacher said that you take the # of outcomes over the total amount to get the ratio so for the blue beads it would be 6/9 or in other words the ratio would be 6:9. For the gold it would be 3 :9 because there are...
*July 11, 2012*

**goverment**

Choices- -legislative branch -House of Representatives -Supreme Court -executive branch
*June 13, 2012*

**statistics**

Bob scores 610 on his SAT's. If the mean score is 580 and the standard deviation is 115, what percentile is Bob's SAT score?
*May 21, 2012*

**Chemistry**

how many grams of aluminum sulfate are produced if 23.33 g Al reacts with 74.44 G CuSO4
*May 21, 2012*

**geometry**

Two triangles each have adjacent sides of length 120 feet and 180 feet. The first triangle has an angle between the two sides of 40 degrees, while the second triangle has an angle between the two sides of 60 degrees. What is the approximate difference between the areas of the ...
*May 2, 2012*

**economics**

4. Engineers for the Off Road Skateboard Company have determined that a 10% increase in all inputs will cause output to increase by 5%. Assuming that input prices remain constant, you correctly deduce that such a change will cause ________ as output increases. A) total cost to...
*May 1, 2012*

**Physics**

A copper pipe with an outer radius of 0.011 m runs from an outdoor wall faucet into the interior of a house. The temperature of the faucet is 4.4° C and the temperature of the pipe, at 3.1 m from the faucet, is 24° C. In fourteen minutes, the pipe conducts a total of ...
*April 26, 2012*

**Math**

6 3/5+1 3/5=8 1/5 +
*April 23, 2012*

**Physical Science**

A hockey puck moving at 28 m/s is caught by an 80.00 kg man who was at rest. The man and puck move together after the collision. The puck's mass is 0.16 kg. What is the final velocity?
*April 12, 2012*

**math**

Find the dimensions of a rectangle with perimeter 40 with the largest area. (hint: Find an equation for area and one for perimeter, use both to find perimeter in terms of one variable)
*March 20, 2012*

**CALCULUS WXMAXIMA !!PLEASE!**

thank you so muchh!
*March 7, 2012*

**CALCULUS WXMAXIMA !!PLEASE! **

y=log(100493/40000*x-1) y=atan(100493/40000*x+1) y=exp(-100493/40000*x+1) Note you will need 2 integrals to represent the area. Approximate the area of the region bounded by the given curves. I can do it with two but kinda struggling over here please helppp!
*March 7, 2012*

**math**

Looking at a table of numbers and there is a pattern starting with the number 501, then shaded numbers every 8th number starting with 509. How do I use place value to describe how the numbers change?
*February 13, 2012*

**7th math**

7x(x+4).... (b+11)2b...
*February 7, 2012*

**7th math**

can you help me with this..../ 8(x-5) -3(w+4)
*February 7, 2012*

**Geometry **

if m<afb= 8x-6 and m<bfc = 14x+8, find the value of x so that <afc is a right angle..
*February 2, 2012*

**Physics**

Nevermind! I got it!
*January 29, 2012*

**Physics**

The treasure map in the figure gives the following directions to the buried treasure: "Start at the old oak tree, walk due north for 490 paces, then due east for 120 paces. Dig." But when you arrive, you find an angry dragon just north of the tree. To avoid the ...
*January 29, 2012*

**Huck Fin**

What is the structure here?
*January 26, 2012*

**Huck Fin**

"Two or three days and nights went by; I reckon I might say they swum by, they slide along so quiet and smooth and lovely. Here is the way we put in the time. It was a monstrous big river down there—sometimes a mile and a half wide; we run nights, and laid up and hid...
*January 26, 2012*

**math**

30 questions are worth 2 and 8 are worth 5
*January 24, 2012*

**math**

518.4 feet long
*January 24, 2012*

**calc**

y = 4x -4 / x^2 vertical asymptotes: ____________________ horizontal asymptotes: ____________________ increasing intervals: ____________________ decreasing intervals: ____________________ relative maxima: ____________________ relative minima: ____________________ concave up ...
*January 24, 2012*

**math**

1. 9y^2 + 24yx + 16x^2
*January 24, 2012*

**Calc**

analaze the graph of y = 2/ (x^2-9) y-intercepts: ____________________ vertical asymptotes: ____________________ horizontal asymptotes: ____________________ increasing intervals: ____________________ decreasing intervals: ____________________ relative maxima: ...
*January 24, 2012*

**physics**

560 m
*January 21, 2012*

**Huck fin **

If you have read Huckleberry Finn before, what was your initial reaction to it?
*January 20, 2012*

**Algebra**

3x + 18 + x = 86 4x + 18 = 86 4x = 86 - 18 x = 68/4 x = 17
*January 18, 2012*

**math**

one, two can't be two fives, equal 10
*January 18, 2012*

**algebra**

12n - 30 = 90 12n = 90 + 30 n = 120/12 n = 10
*January 18, 2012*

**Calculus (Help please)**

Find all the critical numbers for the following function. F(x) = (16 - x^2)^(3/5)
*January 18, 2012*

**Calculus **

Find all the relative extrema of f(x) = x = x3 – 3x2 + 4.
*January 18, 2012*

**Math Q.2**

4.166666666667
*January 12, 2012*

**math**

4|2y-3|-1=11
*January 10, 2012*

**SPANISH**

#1 says/ What stores are in malls there are Mexicans in the malls of America? #2 says/ Where are the young Mexicans to buy cheap clothes and fun? Where are you and your friends? Can bargain there?
*January 10, 2012*

**math**

|3t-2|+6=2
*January 10, 2012*

**math-calculus**

|3|-|9|=-5...ANSWER IS |5|
*January 10, 2012*

**math**

COOOOOOL...THX BROSKI
*January 10, 2012*

**math**

-3|2w|=-12
*January 10, 2012*

**math**

kinetic energy is moving energy, or the energy possessed by an object in motion. potential energy is the the energy possessed by an object during rest. Similarity Think of a roller coaster. The chain pulls the rollercoaster full of people up the hill to the top. On the way up ...
*January 9, 2012*

**geometry**

You are given the measures of two angles, beta and gamma. The three angles of a triangle always total up to 180. alpha + beta + gamma = 180 alpha = 180 - beta - gamma so solve for the measure of alpha You know that gamma is 90 degrees, so you have a right triangle. You can use...
*January 9, 2012*

**math**

Mechanical energy is a kind of energy created by the physical movement or rotation, revolution etc of anything.Since most of the movements done and energy created are done by machines, it is named as mechanical energy
*January 9, 2012*

**Math #Help Meee!!!!!!!!**

|n|+3=7
*January 9, 2012*

**Steve and Reiny**

A tank has the shape of an inverted circular cone with a base radius of 5 meters and a height of 20 meters. If water is being pumped into the tank at 2 cubic meters per minute, find the rate at which the water level is rising when the water is 7 meters deep WELL I HAVE THIS v=...
*January 9, 2012*

**Math (Calculus)**

A tank has the shape of an inverted circular cone with a base radius of 5 meters and a height of 20 meters. If water is being pumped into the tank at 2 cubic meters per minute, find the rate at which the water level is rising when the water is 7 meters deep
*January 9, 2012*

**Math (Calculus)**

A tank has the shape of an inverted circular cone with a base radius of 5 meters and a height of 20 meters. If water is being pumped into the tank at 2 cubic meters per minute, find the rate at which the water level is rising when the water is 7 meters deep
*January 9, 2012*

**math**

No, you can divide 23 by 4 and get 5.75, but you can't split people into 3/4's
*January 9, 2012*

**math**

So a write a word problem? Esna had bought wanted to buy stickers. Esna sister has 15 stickers and Esna always wants to have 3 times as much as the sister. How many stickers did she buy?
*January 9, 2012*

**Calculus (Help please)**

WELL I HAVE THIS v=1/3pi*r^2h v=1/3pi*r2(4r) v=4/3pi*r^3 dv/dt=4pi*r^2 2=4pi(7/4)^2 2=49pi/4 * dr/dt dr/dt= 8/49pi = 0.052 meters per minute
*January 9, 2012*

**Calculus (Help please)**

is the answer 8/49pi= 0.052 meters per minute
*January 9, 2012*

**Calculus (Help please)**

A tank has the shape of an inverted circular cone with a base radius of 5 meters and a height of 20 meters. If water is being pumped into the tank at 2 cubic meters per minute, find the rate at which the water level is rising when the water is 7 meters deep
*January 9, 2012*

**Help Math**

Thanks Steve
*January 9, 2012*

**Help Math**

A circular pulley with a radius of 10 cm is turning at 12 revolutions per minute. How fast is a point on the edge of the pulley rising when it is 5 cm higher than the center of the pulley?
*January 9, 2012*

**5th grade math**

8/12 and 9/12
*January 9, 2012*

**social studies**

A limited government is a government that cannot interfere with personal liberties and individual rights much because it is against the law
*January 9, 2012*

**math (Calculus)**

A circular pulley with a radius of 10 cm is turning at 12 revolutions per minute. How fast is a point on the edge of the pulley rising when it is 5 cm higher than the center of the pulley?
*January 9, 2012*

**help ss !!!!!!!!!!!!!!!**

I believe 1 is b and 2 is b as well
*January 9, 2012*

**6th grade math-ms. sue**

The Control is something you kept the same. There is not enough information for me to say what exactly what it is. For example, if you used the same wheel bearings the entire time that would be the control.
*January 9, 2012*

**calculus**

A spherical balloon is leaking air at 2 cubic inches per hour. How fast is the balloon's radius changing when the radius is 2 inches.
*January 9, 2012*

**math (Caluclas)**

Oh okay. I understand that, i was just not understand where the 9 came from, but i see now. Thank you both
*January 9, 2012*

**math (Caluclas)**

Sorry about that Reiny. I have a quick question though, where does the 9 come from?
*January 9, 2012*

**math (Caluclas)**

A spherical ballon is leaking air at 2 cubic inches per hour.l How fast is the ballons radisu chancing when the radisu si 3 inches.
*January 9, 2012*

**4th grade Math Help**

Nope, Because 23 * 3 = 69 and Mr Brooks has only 66 acorns
*January 8, 2012*

**adv. math**

I NEED THIS ANSWER FAST!!!
*January 8, 2012*

**adv. math**

How do you show work for this problem, in a percent equation form?~ $3680 at 6.75% for 2 1/4 years
*January 8, 2012*

**Physics**

You would convert 290 miles into 1531200 ft which then the answer would be a531200 ft/sec
*December 28, 2011*

**Physics**

Fe = mg = 645 kg * 9.8 N/kg = 6321 N. = Force of elevator. a. P = F * d/t = 6321 * 2.75 = 17382.75J That is the increase in potential, now we must add the increase in kinetic energy, which is: Ws = 1/2 m(Vf)^2 - 1/2 m(Vi)^2 Ws = 1/2 645kg(1.26m/s)^2 - 0 Ws = 512.001J adding ...
*December 14, 2011*

**math**

my brain hurts
*December 7, 2011*

**math**

He saved $2,500 in April. He earned $5,000 in May. Thus he had a total of $7,500 Total spent in May - $4,200 + $2,500+X X= Amount saved in May Thus total = Amount spent + Amount saved Thus total = $4,200 + #2,500 + X + X $7,500 = $4,200 + $2,500 + 2X Solve for X $7,500 = $6,...
*December 7, 2011*

**math**

a square room has sides that each measure 5 feet.How many square feet of carpet is needed to cover the rooms entire floor?
*December 5, 2011*

**calculas**

A car braked at a constant deceleration of 45 ft / s2, producing a skid mark measuring 105 feet before coming to a stop. How fast was the car travelling when the brakes were first applied?
*December 4, 2011*

**MATH!!!! 7th**

nope
*December 1, 2011*

**MATH!!!! 7th**

yeah its the question i need to know what the x is if the mean is 112
*December 1, 2011*

**MATH!!!! 7th**

100,121,105,113,108,x; mean 112
*December 1, 2011*

**Physics**

A 0.165-kg ball, moving in the positive direction at 10 m/s, is acted on by the impulse shown in the graph below. What is the ball's speed at 4.0 s?
*November 30, 2011*

**physics**

Early skeptics of the idea of a rotating Earth said that the fast spin of Earth would throw people at the equator into space. The radius of Earth is about 6400 km. Show why this objection is wrong by determining the following information. a.) Calculate the speed of a 103-kg ...
*November 30, 2011*

**SOCIAL STUDIES!!!**

in what ways did whitneys system improve products
*November 28, 2011*