Sunday

February 26, 2017
Total # Posts: 590

**Chemistry**

x is the unknown mols of H20

*February 23, 2014*

**Chemistry**

If you use the lmax during the calibration plot (Beer's plot) and then change to some other wavelength for the measurement of the sample, how will this affect x?

*February 23, 2014*

**please check this Physics**

Anything?

*January 14, 2014*

**Please help**

Can someone please help me with this?

*January 14, 2014*

**please check this Physics**

A 5kg block slides along a frictionless surface at 8 m/s toward a second block that is 2kg and attached to the end of a spring,The spring has a constant of 250N/m . When the blocks collide they stick together. What is the speed of the two blocks immediately after the collision...

*January 14, 2014*

**History**

Hey! Can someone please help me? :) 1. The main difference between sectionalism and federalism is that sectionalists (1 point) want their state to become its own independent country. believe government should be led by both political parties. want the Missouri Compromise line ...

*December 22, 2013*

**physics**

rjsktkj;fkgjkjkjd;kfjr^

*December 5, 2013*

**Math**

2x-5y=3 and -4x+10=-6 is there a solution. Use any method to solve if possible

*December 4, 2013*

**language arts**

so 1. b

*November 22, 2013*

**language arts**

plz help

*November 22, 2013*

**language arts**

We saw the months of wicked weather, As day to painful night did turn, Waiting, huddled close together For the frozen sun’s return. Our nights were almost endless torture. Our food was gone. Our fuel was low. We came in search of grand adventure But ended trembling in the...

*November 22, 2013*

**Physics**

A uniform solid ball rolls smoothly along a floor, then up a ramp inclined at 13.5 degrees. It momentarily stops when it has rolled 1.65 m along the ramp. What was its initial speed?

*November 17, 2013*

**Math**

Hey there happy to answer your question even i had problems like these A year(365 days) has 52 weeks and 1 day 365\7=52 with 1 day. so a leap year has 52 weeks and 2 days. so, for the friday to have 53 days of itself in the year, it would have to be the first day in case of a ...

*November 17, 2013*

**pre-algebra**

1.write the fraction 5/6 as a percent. Round to the nearest hundredth of a percent where necessary. 33.33% 66.67% 83.33% 1.20% 2. Chris and five of his friends go out to dinner. The total bill comes to $124.29. they decide to leave a 20% tip. Each person will contribute an ...

*November 14, 2013*

**Math**

if 6 bars of soap cost $2.70, how much would 10 bars of soap cost?

*November 13, 2013*

**Math**

A U.S. nickel contains 3 ounces of copper for every ounce of nickel. How much nickel is required for 14 pounds of copper?

*November 13, 2013*

**American History**

What does that mean?

*October 17, 2013*

**American History**

1.What was the central conflict between Native American groups and the United States, and how did their goals differ? 2. (a)What attempts were made to solve the conflict, and what circumstances usually caused the efforts to fail? (b)What other solutions to the conflict could ...

*October 17, 2013*

**American History**

How did tariffs and the gold standards affect (a) farmers and (b) businesses and banks.

*October 17, 2013*

**American History**

Analyze the effects of the federal government's monetary policies such as tariffs and the gold standard, on the following groups: (a) farmers; (b) businesses and banks.

*October 17, 2013*

**American History**

How did homesteaders cause the spread of traditional values such as democracy and a strong work ethic?

*October 17, 2013*

**Algebra 2**

For the first time customers, a bank will open an account with $25 included. This bank also charges a monthly $2.95 service fee on the account. Write an equation that shows the balance B after m months, assuming no other activity is made on the account. Find the balance in the...

*October 12, 2013*

**Physics**

The density of gold is 19 times that of water. If you take a gold crown weighing 32 N and submerge it in water, how much upward force must you exert on the submerged crown to keep it from accelerating?

*October 8, 2013*

**Physics**

A bag of sugar weighs 6.70 lb on Earth. a) What would it weigh in newtons on the Moon, where the free-fall acceleration is one sixth that on Earth?

*September 30, 2013*

**Physics**

Which of the following surfaces has the largest amount of static friction against your skin? Which one has the highest coefficient of static friction against your skin? Select one: a. sandpaper b. ice c. wax paper d. A Teflon coated sheet.

*September 22, 2013*

**Physics**

A Nordic jumper goes off a ski jump at an angle of 10.0° below the horizontal, traveling 109.0 m horizontally and 44.0 m vertically before landing. (a) Ignoring friction and aerodynamic effects, calculate the speed needed by the skier on leaving the ramp.

*September 19, 2013*

**Physics**

A Nordic jumper goes off a ski jump at an angle of 10.0° below the horizontal, traveling 109.0 m horizontally and 44.0 m vertically before landing. (a) Ignoring friction and aerodynamic effects, calculate the speed needed by the skier on leaving the ramp.

*September 18, 2013*

**Physics**

A boat moves through the water of a river at 9.5 m/s relative to the water, regardless of the boats direction. If the water in the river is flowing at 0.9 m/s, how long does it take the boat to make a round trip consisting of a 300-m displacement downstream followed by a 300-m...

*September 16, 2013*

**Physics**

A Nordic jumper goes off a ski jump at an angle of 10.0° below the horizontal, traveling 109.0 m horizontally and 44.0 m vertically before landing. (a) Ignoring friction and aerodynamic effects, calculate the speed needed by the skier on leaving the ramp.

*September 16, 2013*

**Physics**

A girl delivering newspapers covers her route by traveling 9.00 blocks west, 3.00 blocks north, and then 1.00 blocks east. What is the total distance she travels?

*September 16, 2013*

**Physics**

At the airport they have people movers (horizontal escalators). Your friend decides to use the people mover and since you've been sitting decide to walk along side. You would like to continue your conversation and thus need to continue moving at the same speed. Assuming ...

*September 16, 2013*

**Physics**

Two identical heavy metal spheres are released from the same height. Sphere 1 is at rest, and sphere 2 has a velocity of 10 m/s in horizontal direction.

*September 16, 2013*

**Physics**

A ball is thrown upward from the ground with an initial speed of 49 m/s; at the same instant, another ball is dropped from a building 16 m high. After how long will the balls be at the same height?

*September 11, 2013*

**Physics**

A student throws a set of keys vertically upward to her sorority sister, who is in a window 3.80 m above. The keys are caught 1.80 s later by the sister's outstretched hand. (b) What was the velocity of the keys just before they were caught?

*September 11, 2013*

**Physics**

A truck on a straight road starts from rest and accelerates at 3.0 m/s2 until it reaches a speed of 18.1 m/s. Then the truck travels for 24.5 s at constant speed until the brakes are applied, stopping the truck in a uniform manner in an additional 5.7 s. (a) How long is the ...

*September 10, 2013*

**Physics**

Two cars travel in the same direction along a straight highway, on at a constant speed of 38.0 mi/h and the other at 89.0 mi/h. (a) Assuming they start at the same point, how much sooner does the faster car arrive at a destination 44.0 mi away? (b) How far must the faster car ...

*September 9, 2013*

**math**

Angelo is paid double time for each hour he works over 40 hours in a week. Last week he worked 42 hours and earned $484. What is his normal hourly rate?

*August 29, 2013*

**spanish**

1) C 2) B 3) A 4) C 5) D 6) A

*August 17, 2013*

**spanish**

1) Le compro un regalo para mi hermana. Me lo compro esta tarde. Se lo compro esta tarde. Te las compro esta tarde. Se la compro esta tarde. 2) Mis padres viajaron a México. Voy a escribir_____ una carta. les la le los 3) Yo te puedo pagar mañana. Bueno, pá...

*August 17, 2013*

**Statistics(math)**

(20.47 S-AQ) A sample survey interviews an SRS of 252 college women. Suppose (as is roughly true) that 71% of all college women have been on a diet within the past 12 months. Using Normal approximation, what is the probability (±0.001) that 77% or more of the women in ...

*June 7, 2013*

**Chemistry**

This question is based on an experiment to determine the mass of ASA. Information from the experiment : • ASA is a weak acid with a Ka value of 3.2 x 10^-4. • An ASA tablet has an approximate mass of 500 mg. • The experiment used a titration with a standardized ...

*June 4, 2013*

**physics**

a diver makes a running horizontal jump off a cliff located 4m above the water level below. how fast must the driver be traveling at launch in order to clear 6m section of rocks at the water's edge?

*May 22, 2013*

**physics**

car P travels due East along a straight highway at a constant speed of 30m/s. at 9:00am , P passes Exit 17. At precisely the same moment, car Q passes Exit 16, traveling due West as constant 26m/s. Slightly later, car P and car Q pass the same point. knowing the ecits are ...

*May 22, 2013*

**math**

A baseball diamond has 90 ft. between each base. A softball diamond has 60 ft between each base. How many yards longer is the space between bases on a baseball diamond than a softball diamond?

*April 4, 2013*

**math**

jason made 42 bottles of orange juice drink to give to his class. How many pints of juice drink did jason make if each bottle holds 8 fl oz

*February 26, 2013*

**Sociology**

violence

*February 17, 2013*

**science**

how can space change your weight in space

*February 14, 2013*

**Math**

An airplane traveled from Boston to Las Vegas making a stop in St. Louis. The plane traveled 2410 miles altogether, which is 230% of the distance from Boston to St. Louis. Find the distance from Boston to St. Louis to the nearest mile. Please help! Thank you so much! (:

*February 12, 2013*

**chemistry**

calculate the dimensions of a cube that contains 22.4L of gas at STP.

*February 10, 2013*

**Algebra 2**

Yes thank you!

*January 26, 2013*

**Algebra 2**

How would you solve the following I'm stumped.. 1. 2x^2(squared)=30-4x 2. X^3(cubed)+8x=-6x^2(squared) Thanks!

*January 26, 2013*

**Algebra 2**

Tickets to the school musical cost $3 for students and $5 for non students. Total ticket sales were $1790. The number of student tickets sold was 100 less than twice the number of non student tickets sold. Write a system of equations to represent this situation. Solve the ...

*January 22, 2013*

**MATH HELPPPPPPP**

Noah and Brianna want to calculate the distance between their houses which are opposite sides of a water park. they mark a point, A, 150 m along the edge of the water park from brianna's house. the measure ÚNBA as 80‹and ÚBAN as 75...

*January 15, 2013*

**math(ASAP HELP)**

7. two paths diverge at a 48 degree angle. two mountain bike riders take separate routes at 8km/hr and 12 km /hr.how far apart are they after two hours? 8. Draw a diagram to solve this problem: Ajax is 10 km due west of Oshawa. Uxbridge is 18 km NW of Oshawa. How far is it ...

*January 15, 2013*

**Math**

Solve each inequality by using algebra. 24. x 2 - 11x + 13 ≤ 25 25. -2x 2 + 3x + 4 ≥ -1 26. x 2 - 5x - 4 < -9 27. Sports A football thrown by a quarterback follows a path given by h(x) = -0.0095x 2 + x + 7, where h is the height of the ball in feet and x is the ...

*January 7, 2013*

**College Chemistry**

Is .1M NaH2PO4 a good buffer? Explain.

*December 6, 2012*

**Math**

Are drawing a black and red card independent or mutually exclusive? Are drawing a black card and queen independent? Are drawing a face card and queen independent?

*December 2, 2012*

**Probability**

Can someone please help me? certain medical diagnostic test is used to determine if people have pinkyitis and it is known that 1 in 1300 Americans has the disease. The test correctly diagnoses the presence of pinkyitis 97% of the time and it correctly diagnoses the absence of ...

*December 2, 2012*

**Probability**

Can someone please help me. A single card is selected from a standard 52-card deck. B= the drawn card is black; R= the drawn card is red; Q= the drawn card is a queen; F= the drawn card is a face card ( a king, queen or jack). Without finding the probabilities, determine if B ...

*December 2, 2012*

**math**

Magnus purchased a car for $35,865. It depreciates about 3.6% each year. What is the value of the car after ten years?

*November 30, 2012*

**pre cal**

For a given right triangle, angle B = 46± and side c = 30 feet. What is the length of side a to the nearest foot?

*November 30, 2012*

**pre calculus**

For a given right triangle, angle A = 61± and side b = 39 feet. What is the length of side a to the nearest foot?

*November 30, 2012*

**pre calculus**

For a given right triangle, angle A = 61± and side b = 39 feet. What is the length of side a to the nearest foot?

*November 30, 2012*

**pre calculus**

For a given right triangle, side a = 76.4 feet and side b = 39.3 feet. What is the length of side c to the nearest tenth of a foot?

*November 30, 2012*

**pre calculus**

For a given right triangle, side a = 76.4 feet and side b = 39.3 feet. What is the length of side c to the nearest tenth of a foot?

*November 30, 2012*

**pre calculus**

For a given right triangle, angle B = 46 degrees and side c = 30 feet.What is the measure of angle A to the nearest degree?

*November 30, 2012*

**pre calculus**

For a given right triangle, side a = 490 feet and side b = 960 feet. What is the measure of angle B to the nearest degree?

*November 30, 2012*

**pre calculus**

For a given right triangle, side a = 400 feet and side b = 900 feet. What is the measure of angle B to the nearest degree?

*November 30, 2012*

**pre calculus**

For a given right triangle, angle A = 61± and side b = 39 feet. What is the length of side c to the nearest foot?

*November 30, 2012*

**pre calculus**

For a given right triangle, side a = 400 feet and side b = 900 feet.What is the measure of angle A to the nearest degree?

*November 30, 2012*

**pre calculus**

For a given right triangle, angle B = 46 degrees and side c = 30 feet.What is the length of side b to the nearest foot?

*November 30, 2012*

**Pre Calculus**

For a given right triangle, side a = 76.4 feet and side b = 39.3 feet. What is the measure of angle A to the nearest degree?

*November 30, 2012*

**science**

What is the alleles of pea pot parents and the possible allele combinations of the offspring. Both parents are tall and 3 offsprings are tall while the other one is short. I don't get this! Please help! Thanks!!

*November 27, 2012*

**Physics B**

A(n) 685 N man stands in the middle of a frozen pond of radius 14.6 m. He is unable to get to the other side because of a lack of friction between his shoes and the ice. To overcome this diﬃculty, he throws his 1.3 kg physics textbook horizontally toward the north shore...

*November 12, 2012*

**Physics B**

A(n) 685 N man stands in the middle of a frozen pond of radius 14.6 m. He is unable to get to the other side because of a lack of friction between his shoes and the ice. To overcome this diﬃculty, he throws his 1.3 kg physics textbook horizontally toward the north shore...

*November 12, 2012*

**Physics B**

Part 1 A pitcher claims he can throw a 0.167 kg baseball with as much momentum as a 2.43 g bullet moving with a speed of 87735 m/s. What must be its speed if the pitcher’s claim is valid? Answer in units of m/s Part 2 What is the kinetic energy of the bullet? Answer in ...

*November 12, 2012*

**math**

7 less than 3 times x

*October 27, 2012*

**Ap Chemisty**

If .237 mol of ammonia react with 56g of iodine, how much Nitrogen triiodid, in grams, is produced?

*October 24, 2012*

**Physics.**

A block of mass 3m is placed on a frictionless horizontal surface, and a second block of mass m is placed on top of the first block. The surfaces of the blocks are rough. A constant force of magnitude F is applied to the first block. a) Identify the horizontal force that ...

*October 16, 2012*

**ENGLISH**

1. Which of the following quotations is the best example of a paradox? (1 point)“I’ll drain him dry as hay. . . ” “Lesser than Macbeth, and greater.” “So well thy words become thee as thy wounds. . . ” 2. Which of the following is an example ...

*October 14, 2012*

**math**

What is 548 rounded to the nearest 10

*September 25, 2012*

**math**

Draw a model to represent the following quotient 2 1\2 / 2\3

*September 16, 2012*

**math**

Selena is making cookies. To make one dozen cookies, she needs 2/3 cup of brown sugar. How many cups of brown sugar does Selena need to make 4 1/3 dozen cookies?

*September 16, 2012*

**math**

how many 1/3 inch ribbons can be cut from a piece of ribbon that is 4 and 1/3 inches long?

*September 16, 2012*

**Math**

Find the value of y for a given value of x, if y varies directly with x. If y = –252 when x = 84, what is y when x = 74?

*September 1, 2012*

**Physics**

A speeding car is traveling at a constant 30.0 m/s when it passes a stopped police car. The police car accelerates at 7.0 m/s^2. a)how far will the police travel to catch up to the speeder? b) how fast will it be going when it catches up?

*August 28, 2012*

**Physics**

A speeding car is traveling at a constant 30.0 m/s when it passes a stopped police car. The police car accelerates at 7.0 m/s^2. a)how far will the police travel to catch up to the speeder? b) how fast will it be going when it catches up?

*August 28, 2012*

**Physics**

What are the first, second, and third frequencies audible from a 20 cm long organ pipe when (A) only one end is open and when (B) both ends are open. The speed of sound through the air inside the organ pipe is 343m/s. (Hint: if a harmonic does not exist, it would not be heard.)

*July 10, 2012*

**Precalculus check answers help!**

16. Find the distance between P (–2, 5) and the line with equation x – 3y + 4 = 0. (1 point) 17(sqrt10)/ 10 0 -17(sqrt10)/ 10 13(sqrt10)/ 10 ~ 17. Find the distance between the lines with equations 5x + 12y = 12 and y = –x + 3. (1 point) 24/13 ~ 48/13 -48/13 48/...

*May 31, 2012*

**Precalculus check answers help!**

16. Find the distance between P (–2, 5) and the line with equation x – 3y + 4 = 0. (1 point) 17(sqrt10)/ 10 0 -17(sqrt10)/ 10 13(sqrt10)/ 10 ~ 17. Find the distance between the lines with equations 5x + 12y = 12 and y = –x + 3. (1 point) 24/13 ~ 48/13 -48/13 48/...

*May 30, 2012*

**Precalculus check answers help!**

7.) Write the equation 3x + 4y – 7 = 0 in normal form. 3/5x + 4/5y + 7/5 = 0 -3/5x - 4/5y - 7/5 = 0 -3/5x - 4/5y + 7/5 = 0 ~ 3/5x + 4/5y - 7/5 = 0 8.)Write the standard form of the equation of a line for which the length of the normal is 4 and the normal makes an angle of...

*May 30, 2012*

**Precalculus check answers help!**

is 3 -1? and im not sure what i did on number 1 ? please explain.

*May 30, 2012*

**Precalculus check answers help!**

1.) Find an expression equivalent to sec theta sin theta cot theta csc theta. tan theta csc theta sec theta ~ sin theta 2.) Find an expression equivalent to cos theta/sin theta . tan theta cot theta ~ sec theta csc theta 3.) Simplify (tan^2 theta + 1)/(tan^2 theta) . csc2 ...

*May 30, 2012*

**Precalculus check answers help!**

1. Which expression is equivalent to cos 2theta for all values of theta ? cos^2 theta – sin^2 theta ~ cos^2 theta – 1 1 – 2 sin^2 theta 2 sin theta cos theta 2. Use a half–angle identity to find the exact value of sin 105°. -1/2(sqrt)(2 + Sqrt3) 1/2(...

*May 28, 2012*

**Precalculus check answers help!**

1.) Find an expression equivalent to sec theta sin theta cot theta csc theta. tan theta csc theta sec theta ~ sin theta 2.) Find an expression equivalent to cos theta/sin theta . tan theta cot theta ~ sec theta csc theta 3.) Simplify (tan^2 theta + 1)/(tan^2 theta) . csc2 ...

*May 28, 2012*

**Calculus!**

Which is the standard form of the equation with p = 26, O=3pi/4 ? the O before the =3pi has a diagonal slash through it.

*May 12, 2012*

**Analytic Geometry**

Given two planes, discuss the methods used to determine if the planes are parallel, perpendicular, coincident, or none of these.

*May 10, 2012*

**Physics**

The grindstone, in the shape of a solid cylinder, weighs 80.0 kg, and has a radius of 0.320 m. The coefficient of friction between the axe and the stone is mk = 0.620 m. The radial component of the force of the axe against the grindstone is closest to...

*May 3, 2012*

**Physics**

The grindstone weighs 80.0 kg, and has a radius of 0.320 m. The coefficient of friction between the axe and the stone is mk = 0.620 m. The radial component of the force of the axe against the grindstone is closest to...

*May 3, 2012*

**English**

is a i think that's it

*May 2, 2012*