Thursday

October 2, 2014

October 2, 2014

Total # Posts: 4,014

**Mathematics **

a bus travelled at at average speed of 54km/hour from lape town to cape town calculate in km the distance from lape to cape town
*April 19, 2012*

**algebra 2**

When you spend $1 at the grocery store, the store doesn’t keep all of your money as profit. Some of it is reinvested in the economy when the grocery store buys more merchandise from suppliers. In turn, the suppliers don’t keep all of that money as profit, either; ...
*April 18, 2012*

**spanish**

¿Te gusta el nuevo portátil? No, prefiero la vieja. No, prefiero los viejos. No, prefiero el viejo.
*April 18, 2012*

**spanish**

Escribe pero, sino o sino que en el espacio. Escribe solamente la palabra que falta 1)No veo a tu primo, ____ a tu padre. 2) Esa tienda vende muy buenos productos ____ son caros. 3)No les gustan los videojuegos ____ los juegos de mesa. 4) Las pilas no son caras ___ baratas. 5...
*April 18, 2012*

**Geometry**

A right prism has bases that are squares. The area of one base is 81 square feet. The lateral area of the prism is 144 square feet. What is the altitude of the prism.
*April 18, 2012*

**Chemistry**

78 mL of a 1.60M solution is diluted to a volume of a 238mL. A 119-mL portion of that solution is diluted using 133 mL of water. What is the final concentration
*April 13, 2012*

**Chemistry**

What volume of 85% H3PO4(d=1.68g/mL) and weight of KH2PO4 are required to prepare a buffer of pH=3 that has an ionic strength of 0.2?
*April 13, 2012*

**math**

can you show me step by step how to factor 15x^2-14x-8
*April 11, 2012*

**math**

A stack of 24 workbooks weighs 14 2/5 lb. How much does each workbook weigh?
*April 11, 2012*

**chemistry**

You have a 1 L container of a gas O 2 at 20°C and 1 atm. Subtracting the weight of the container, what is the mass of the gas?
*April 9, 2012*

**Chemistry**

Need help with AP chemistry, specifically Acids and Bases The acid ionization constant, Ka, for propanoic acid, C2H5COOH, is 1.3 10 -5 . (a) Write the expression for the acid-dissociation constant, Ka for propanoic acid. (b) Calculate the hydrogen ion concentration, [...
*April 9, 2012*

**Chemistry**

Need help in AP chemistry on Equilibrium When heated, hydrogen sulfide gas decomposes according to the equation 2 H2S(g) ⇄ 2 H2(g) + S2(g) A 3.40 g sample of H2S(g) is introduced into an evacuated rigid 1.25 L container. The sealed container is heated to 483 K, and 3.72 ...
*April 9, 2012*

**Chemistry**

SO this is my first time doing this... lol i need help on an AP chemistry question for equilibrium. A 0.500 L tank contains 3.00 g of NO(g) at 750. K. The equilibrium constant for the reaction below at this temperature is 3.4 x 10 -3 2NO(g) ⇌ N2(g) + O2(g) (a) write the ...
*April 9, 2012*

**Chemistry**

How many mL of .175M H3PO4 are needed to neutralize 15.00mL of .33M NaOH?
*April 8, 2012*

**Chemistry**

How many mL of .48 M NaOH are needed to react with 2.00 moles of H3PO4?
*April 8, 2012*

**math**

help with convert franction to percent 29/50 and 42/50
*April 2, 2012*

**math**

there are fewer than 6 dozen eggs in a basket. If I count them by 2's there is 1 left over. If I count them by 3's there are 2 left over Three are left if I count by 4s. Four are left if I count by 5s. how many egs are there
*March 31, 2012*

**Chemistry**

If I react a phosphorus ylide with trans-cinnamaldehyde, what would the ratio of trans-trans to cis-trans isomer would I likely get?
*March 30, 2012*

**Business**

How does poverty affect the economy?
*March 28, 2012*

**ps 189**

if a aluminum can has a radius of 10cm and a height of 20 cm. how many square cm of aluminum does it take to make such a can.
*March 25, 2012*

**Math**

Suppose that you select 2 cards without replacement from an ordinary deck of playing cards. a) If the first card that you select is a heart, what is the probability that the second card that you select is an heart? b) If the first card that you select is an ace, what is the ...
*March 23, 2012*

**math**

Suppose that you select 2 cards without replacement from an ordinary deck of playing cards. a) If the first card that you select is a heart, what is the probability that the second card that you select is an heart? b) If the first card that you select is an ace, what is the ...
*March 21, 2012*

**probability**

Suppose an unfair coin comes up heads 52.2% of the time if it is flipped. If the coin is flipped 26 times, what is the probability that: a) it comes up tails exactly 12 times? b) it comes up heads more than 22 times?
*March 21, 2012*

**chemistry**

What is the pH of a solution if 100.0 mL of the solution is 0.23 M with respect to acetic acid and contains 1.71 g of sodium acetate, NaCH3CO2?
*March 18, 2012*

**Math**

x(x+4)^(2/3) a). Find the second derivative b). Find any points of Inflection c). Determine the intervals of Concavity
*March 17, 2012*

**Math**

Find a unit rate for number of parts manufactured per hour if 1628 parts are made in seven hours round to the nearest integer
*March 15, 2012*

**Biology**

Music Video Project Biology? Hey! So I am doing a music video project for AP Biology, and my topic is Gene Regulation. I want to know what should be the most important things I should include in my song, and what song I should use (80's/90's/Current) to parody for this...
*March 14, 2012*

**science**

Let us suppose the mass of iron be x.
*March 13, 2012*

**Music Video Project**

Hey guys! I am in a bit of a dilemma. I am doing a music video project for my AP Biology class and My topic is GENE REGULATION! I have no clue what to sing for it. What could be a good chorus? hook? What should be the most important to include in my song about the topic? Thanks!
*March 13, 2012*

**math**

After school, Chase spends 20 min reading, 30 min practicing the piano, 15 min cleaning his room, and 40 min doing his homework. Chase is busy for 105 min.What fraction of the time does he spends cleaning his room?
*March 12, 2012*

**PHYSICS**

Find the force of attraction on a 3 kg mass at the surface of a planet given the following information about the planet: mass = 5.98 x 10^24 kg, radius = 6.38 x 10^6 m. Find the force if the radius is doubled to 12.76 x 10^6m Thanks!!
*March 10, 2012*

**Physics**

Please help! I've tried several times on my calculator and I can't get it right! Find the force of attraction on a 3 kg mass at the surface of a planet given the following information about the planet: mass = 5.98 x 1024 kg, radius = 6.38 x 106 m. Find the force if the...
*March 10, 2012*

**Physics**

An asteriod is found a distance from the sun equal to 32 units times the earth's distance. What will be the length of time in years required for this asteriod to make one revolution around the sun?
*March 10, 2012*

**Math**

Divide = 5 hrs
*March 8, 2012*

**math**

Does anyone have any ideas
*March 8, 2012*

**math**

Need to make a problem, using parentheses and use as many operations to write an expression equal to to th target number. You can only use each number once in an expression. Numbers 6,7,12,14,20 Target number = 41
*March 8, 2012*

**physics**

A pendulum has a period of 0.70 s on Earth. What is its period on a planet where the acceleration of gravity is about 0.51 that on Earth?
*March 7, 2012*

**Chemistry**

A buffer is prepared by mixing 0.30 mole of formic acid (HCNO2) and 0.20 mole of sodium formate (NaCHO2) in enough water to make 0.50 liter of solution. Ka of formic acid is 1.7 x 10-4. Calculate the pH of the resulting buffer solution.
*March 7, 2012*

**4th grade math**

what is 1 4th of 10
*March 6, 2012*

**Math**

14 1/2 - 5 1/4 =
*March 6, 2012*

**Math**

3 1/6 - 1 1/3 =
*March 6, 2012*

**Math**

Rounding each mixed # to nearest whole #. 1 7/8 - 2 1/4 Plz explain answer, thx
*March 6, 2012*

**Math **

How to solve- |-4(7-x)|=3
*March 6, 2012*

**Math**

4 3/7 + 7 1/2 = Thanks
*March 6, 2012*

**math**

david wants to buy a motorcycle for2500. He has no money in his savings. He gets a job where he earns $50 an hour. how many 8 hour work days will it take to reach his goal of 2500? Must write an equation to represent the situation then solve and explain.
*March 5, 2012*

**Physics**

Take the radius of the earth at the equator to be 6380 km a. Find the speed the speed of an object at the equator due to the earth's rotation. ___m/s b. Convert this speed to miles/hour (show your conversion factor in your written backup). __miles/hour
*March 5, 2012*

**health 3 ms sue**

d all of the above
*March 4, 2012*

**MATH! :(**

Yesterday, at a local restaurant, 60% of the customers ordered a burger. If 42% of the customers ordered a burger and fries, what is the probability that a customer who ordered a burger also ordered fries? If 15% of the customers ordered a burger and onion rings, what is the ...
*March 4, 2012*

**Physics**

A 10 kg block rests on a frictionless table and is whirled in a circle and kept in a radius of 1.6 m by a rope attached to a peg. What is the tension in the rope if the block has a linear speed of 18 m/s? __N
*March 4, 2012*

**Physics**

A Ferris wheel has a radius of 14 m. What period of rotation would give the occupants a feeling of "weightlessness" at the top? __s
*March 4, 2012*

**math**

8 9/10 minus 3 4/10 =
*March 3, 2012*

**math**

a school has purchased a large field that has a square area of 19,500 ft squared. what is the approximate length of each side of the square area?
*March 3, 2012*

**math**

5x-(2a^6•16b)= -3b(6a^2 -(5bx))
*March 1, 2012*

**Geometry**

In triangleRST, mangR = (2x + 10)°, mangS = (2x + 25)°, and mangT = (x – 5)°. Find the value of x.
*March 1, 2012*

**physics**

Ayesha exerts a force of 186 N on a lever to raise a 2.70 × 103-N object to a height of 29.0 cm. If the efficiency of the lever is 83.3 percent, how far does Ayesha move her end of the lever?
*February 29, 2012*

**Chem II**

thank you
*February 29, 2012*

**Chem II**

PCl5 dissociates according to the reaction: PCl5(g) ↔ PCl3(g) + Cl2(g). One mole of PCl5 was placed in one liter of solution. When equilibrium was established, 0.5 mole of PCl5 remained in the mixture. What is the equilibrium constant for this reaction?
*February 29, 2012*

**PHYSICS!! SOS**

Determine the scalar product of A= 3.0i + 1.0j - 2.0k and B= 3.0i - 2.0j - 3.0k .
*February 29, 2012*

**Science**

A person performs a work task at a mechanical efficiency of 20 percent and at total energy output of 15kcal/min. How much energy(kcal/min) is lost as heat? and how much energy(kcal/min) is used to actually perform the work?
*February 29, 2012*

**Kinesology**

A person performs a work task at a mechanical efficiency of 20 percent and at total energy output of 15kcal/min. How much energy(kcal/min) is lost as heat? and how much energy(kcal/min) is used to actually perform the work?
*February 29, 2012*

**Physics**

In her physics lab, Stephanie rolls a 30 g marble down a ramp and off a table with a horizontal velocity of 2 m/s. The marble falls in a cup placed 0.4 m from the table’s edge. a. How long is the ball in the air? 0.2 s b. How high is the table? m
*February 27, 2012*

**Math**

A fisherman has estimated that it takes 6 minutes to paint each square foot of the hull of his boat? How much time should the fisherman allow for the painting of the hull, if the hull were composed of two sides, each 31.5 feet by 8.00 feet? Is the correct answer 50.4 hours?
*February 25, 2012*

**probability problem**

A box contains 6 green, 8 red, 5 yellow, and 10 blue marbles. Four marbles are drawn from the box at the same time. a) What is the probability that all four marbles are the same color? b) What is the probability that none of the marbles is blue? c) What is the probability that...
*February 24, 2012*

**Orgo**

Thank you I was able to work it out: it's a 1:1 ratio so since 5.5g chlorophenol is .043 mols, nitric acid must be .043 mols as well. V(1.20M) = .043mol V= .036L
*February 24, 2012*

**Orgo**

What volume of 1.20 M nitric acid is needed to convert 5.5g of m-chlorophenol to 3-chloro-2,6-dinitrophenol? I So far I have converted the 5.5g chlorophenol to mols and I got .043 mol. I know Volume * Molarity (1.2M)=moles. At this point I am stuck.
*February 24, 2012*

**US Government**

What should be the goals of the US government today? I have to write an essay with this very question but I need help to formulate at least 4 different topics that the US Government should focus on.
*February 24, 2012*

**math**

jeremy has 19 coins of 2 different values. the total value of coins is 1$ what are the coins and how many of each coins does he have
*February 23, 2012*

**Anatomy**

I need a site that has a labled picture of what parts are found in the knee joint when disecting a fetal pig
*February 23, 2012*

**physics**

A water-skier lets go of the tow rope upon leaving the end of a jump ramp at a speed of v1 = 14.7 m/s. the skier has a speed of v2 = 12.7 m/s at the highest point of the jump. Ignoring air resistance, determine the skier's height H above the top of the ramp at the highest ...
*February 20, 2012*

**Precalculus**

find roots of w^(4)+2^(3)+3^(2)+4w-52=0
*February 20, 2012*

**Animal Science**

what time of the year do feral cats usually mate?
*February 20, 2012*

**spanish**

Completa las oraciones con la forma correcta de cada verbo. 1. En bicicleta podemos explorar el parque sin _____(caminar) demasiado. 2. Mis hijos van a dejar todo limpio antes de ____(salir) del parque. **I have tried every possible form of verb conjugation and I can't ...
*February 18, 2012*

**math**

I have to make a line segment that is 5000mm long I have no idea how long Can u help me?
*February 16, 2012*

**english**

"#1 Crush" - Garbage Local God - Everclear "Angel" - Gavin Friday "Pretty Piece of Flesh" - One-Inch Punch Kissing You (Love Theme from Romeo + Juliet) - Des'ree – "Whatever (I Had a Dream)" - Butthole Surfers Lovefool - The ...
*February 12, 2012*

**english**

i need to chose at least 8 songs and how they relate to romeo and juliet acts so i can make a soundtrack. thanks
*February 12, 2012*

**english**

how do i create a eight song soundtrack
*February 12, 2012*

**english**

"#1 Crush" - Garbage Local God - Everclear "Angel" - Gavin Friday "Pretty Piece of Flesh" - One-Inch Punch Kissing You (Love Theme from Romeo + Juliet) - Des'ree – "Whatever (I Had a Dream)" - Butthole Surfers Lovefool - The ...
*February 12, 2012*

**economics**

econ
*February 10, 2012*

**Chemistry**

Okay, so I have to find the percent of water in each solution, but it involves different reagents and I'm not sure how to figure it out. Here's one example: Add all together - 4 mL water 2 mL of 0.01 M aqueous NaOH 2 mL acetone 2 mL 0.1 M alkyl halide in acetone How do...
*February 9, 2012*

**Budget**

no it's nothing right
*February 9, 2012*

**physics**

A copper block with a mass 1.82 kg is given an initial speed of 3.5 m/s on a rough horizontal surface. Because of friction, the block finally comes to rest. Assume that 77.4 % of the initial kinetic energy is absorbed by the block in form of heat, what is the change in ...
*February 9, 2012*

**algebra**

Kristen wants to make 7.5 ounces of a 25% jasmine essential oil. She only has a 15% jasmine mixture and a 30% jasmine mixture available. How much of each mixture should she combine to create the desired oil?
*February 9, 2012*

**math**

16,16
*February 9, 2012*

**algebra**

As part of her training routine for basketball, Shaylle alternates between cycling and running for exercise. She cycles at a rate of 14 mph and runs at a rate of 8 mph. If she spends 6.5 hours exercising and covers a total of 85 miles, how much time did she spend on each ...
*February 8, 2012*

**math**

Order the numbers from least to greatest.. 2/3 6.17 √28 -31/8 -4.9
*February 4, 2012*

**physics**

A person throws a 2.50 lb stone into the air with an initial upward speed of 15.0 ft/s. Part A- Make a free-body diagram of the forces for this stone after it is free of the person's hand and is traveling upward Part B - Make a free-body diagram of the forces for this ...
*February 2, 2012*

**chem grade 12**

Consider the following substance: Al2(SO4)3 What is the oxidation number of: a) aluminum b) sulfur c)oxygen
*January 31, 2012*

**Chemistry**

Which compound below would be expected to have the highest boiling point? a) CH3-CH2-CH2-CH2-CH2-CH2-CH3 b) CH3-CH2-CH2-CH2-CH-CH3 | CH3 c) CH3-CH-CH2-CH-CH3 | | CH3 CH3 d) CH3 | CH3-CH-C-CH3 | | CH3 CH3 I think its A?
*January 31, 2012*

**Chemistry**

Which compound below would be expected to have the highest boiling point? a) CH3-CH2-CH2-CH2-CH2-CH2-CH3 b) CH3-CH2-CH2-CH2-CH-CH3 | CH3 c) CH3-CH-CH2-CH-CH3 | | CH3 CH3 d) CH3 | CH3-CH-C-CH3 | | CH3 CH3 I think its A?
*January 31, 2012*

**Chemistry**

Which compound below would be expected to have the highest boiling point? a) CH3-CH2-CH2-CH2-CH2-CH2-CH3 b) CH3-CH2-CH2-CH2-CH-CH3 | CH3 c) CH3-CH-CH2-CH-CH3 | | CH3 CH3 d) CH3 | CH3-CH-C-CH3 | | CH3 CH3 I think its A?
*January 31, 2012*

**physics**

What is the force of gravity between two 832 kg cars separated by a distance of 29.35 m on an interstate highway?
*January 30, 2012*

**calculus**

A plane flying along a straight path loses altitude at the rate of 1000 ft for each 5200 ft covered horizontally. What is the angle of descent of the plane? (Round your answer to one decimal place.)
*January 29, 2012*

**AP Chem**

A weak acid (HA) is found to ionize 16.2% when mixed at a concentration of 0.21 mol/L. What is the value of Ka for this acid?
*January 28, 2012*

**physic**

w= (correct unit)
*January 27, 2012*

**physic**

Calculate the mass (in SI units) of a 150 lb human being. m= (correct unit) Calculate the weight (in English units of a 2000 kg rhinoceros.
*January 27, 2012*

**physics**

A 0.579 kg basketball is dropped out of a window that is 6.22 m above the ground. The ball is caught by a person whose hands are 1.31 m above the ground. How much work is done on the ball by its weight?
*January 25, 2012*

**physics**

By what factor is the kinetic energy increased when the speed of a car is increased from 21 km/h to 98 km/h?
*January 25, 2012*

**Math**

Is the sum of the measure of all the angles that come together in the center of a circle the same for every circle
*January 25, 2012*

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