Thursday
July 31, 2014

Posts by Chris


Total # Posts: 2,149

trig
find exact value cos(13pi/15)cos(-pi/5)-sin(13pi/15)sin(-pi/5)

trig
find exact value using sum or differnce equations. tan(19pi/12)

pre-algebra (interests & percentss)
$21.60

statistics
When a card is selected from a deck, find the probability of getting a diamond, a face card or a diamond, or a club and a king?

physics
an atwoods machine has a solid cylindrical pulley with a mass of 200g and a radius of 10cm. a 1.2 kg mass is hung on one side and a 1.1kg mass on the other side, find the acceleration of the two masses and the itme for them to travel a distance of 60cm

chemistry
A sample of a gas occupies a volume of 1158 mL at 59ºC and 0.76 atm. What would be the new volume if temperature decreases to 40ºC and pressure increases to 1.40 atm?

Science: Chemistry
A sample of a gas at 0.73 atm occupies a volume of 245 mL. If the temperature remains constant, what will be the new pressure if the volume increases to 633 mL?

physics
P fluid=r x h x g wher h =3.4m P total =P atmospheric + P fluid Normal atmospheric pressure = 1.01 x 10^5

organic chemistry
What is the product of reaction of triphenylmethanol heated up with 40% HI in glacial acetic acid and then treated with sodium bisulfite?

English
1.The castanets, which were quite old, had been Melanie's grandmother's. 2.You were always singing when you were little. 3.Three Indian elephants patiently towed the logs that had just been cut. 4.Stay with us as long as you want. 5.The Forbidden City, where China'...

English
1.Camels stamped and bellowed in annoyance when packs were put on them. 2.Aloe plants, which originated in Africa, are now widely available in the US. 3.As far as scientists can tell, there is no connection between these two events. 4.If you adjust the blinds, you won't ha...

Thermochemistry Ap Chem homework
i used the formula m(delta T)Cp=delta H (10.0)(20.0-0.00)= x and so x = 200... is that correct, if so would the units be degrees celcius?

Thermochemistry Ap Chem homework
Any help would be great, even if it is just a way to start or a formula. Calculate the heat necessary to convert 10.0 g of water (just melted) at 0 degrees Celcius to water at 20 degrees Celcius, assuming that the specific heat remains constant at 1 cal/gram degrees celcius.

algebra
ãx8y5

algebra
need to find square root 292

College algebra
Solve for z 4(4-2z)+1=7(x+2(1-z))

algebra
determine the distance betwen the two points (5,12) and (11,-4)

Chemistry
Reacting Potassium carbonate with Barium chloride

science
what was the acceleration of an object between 8 and 10 seconds if velocity at 8 seconds is 10 mi/hr and 0 mi/hr at 10 seconds?

7th grade math
find a ratio equivalent to the ratio 7 over 9 then use the ratio to write a proportion

English
1.The Reverend Jesse Jackson spoke at the convention. 2.I wear heavy wool socks under my hiking boots. 3.Joel and Tina are participating in the Special Olympics. Identify prepositional phrase, tell if adj or adverb phrase then word that phrase modifies 1.at the convention-adve...

physics BASIC PLEASE HELP
Calculations and Data: Angle: As measured by protractor:7.63 degrees As measured by using inverse sin:7.4 degrees Percent error: ((True value-experimental value)/true value))*100= ((7.4-7.63)/7.4)*100=-3.1081% Time: 1.53s 1.4s 1.53s 1.44s 1.47s Average time= (total of times wh...

English
2.rode 3.something 5.just

English
1.The hikers are ready for a break. 2.Yesterday we rode our bikes through the park. 3.That store has something for everyone. 4.Students from both South America and North America attended the meeting. 5.According to the map, Tony's farm is just ahead. Identify prepositional...

12th grade
if cos Q=5/9, find 5/9

Math
Ashley can ride her bike to work in 2/3 of an hour. When she drives to work it takes 1/3 of an hour. If she drives 12 miles per hour faster than she rides her bike, how fast does she ride her bike?

Physics
A jet pilot is in a vertical loop. If the jet is moving at a speed of 1300 km per hour at the lowest point of the loop determine the minimum radius of the cirlce so that the centripetal acceleration at the lowest point does not exceed 6.0g's.

Physics
I just need help with c A long horizontal hose of diameter 4.2 cm is connected to a faucet. At the other end, there is a nozzle of diameter 2 cm. Water squirts from the nozzle at velocity 24 m/sec. Assume that the water has no viscosity or other form of energy dissipation. a) ...

math
a computer company can sell 1000 computers if they price them at $500. The number sold will increase by 10 for every 1$ decrease in the price. The company has fixed cost of $100,000, and each computer costs $300 to produce. Find the price that will maximize the company's p...

English
I have to add prepositional phrases to the following sentences. Please check to see if correct. 1.The carpenter repaired the roof. 2.The coach explained the play. 1.The carpenter repaired the roof in the house. 2.The coach down the street explained the play.

Chemistry
In calibrating a thermometer by setting only the freezing and boiling points, what assumptions are you making regarding the internal diameter of the thermometer and the expansion of alcohol?

Chemistry
Suppose that you had a mercury-in-glass thermometer marked and calibrated to measure temperatures from -10 degrees celsius to 110 degrees celsius and you wished to measure a temperature of approximately 115 degrees celsius accurately. How might you use your thermometer to do it?

math
I need help with parametric equations, locus problems, tell me how to solve all questions if you can. Need help with one below: Tangents are drawn to a parabola x^2=4y from an external point A(x1,y1) touching the parabola at P and Q (a) Prove that the mid point, M, is the poin...

Chemistry
How many electrons in an atom can have each of the following quantum number or sublevel designations? 1. n = 4, l = 3

Physics
How fast must a 138 g baseball travel in order to have a de Broglie wavelength that is equal to that of an x-ray photon with A = 100. pm?

4th grade
how can you use an array to find partial products for 4x36?

Ap Chemistry.
okay, thank you!

Ap Chemistry.
Zn + 2HCl -> ZnCl2 + H2 If 7.29 g of Zinc reacted, how many liters of HCl were used? I know that i can't use mass volume conversion, because the HCl is not a gas...so what do i do?

9th grade Math
A rectangular floor that measures 3 m by 2 m is covered by 384 square tiles. Determine side length of each tile in centimeters Thanks!

algebra
bayside insurance offers two health plans. under plan A, Giselle would have to pay the first $130 of her medical bills, plus 40 % of the rest. Unde plan B, Giselle would pay the first $140, but only 35% of the rest. For what amount of medical bills will plan B save Giselle mo...

Physics
A 100-N force has a horizontal component of 80 N and a vertical component of 60 N. The force is applied to a box which rests on a level frictionless floor. The cart starts from rest, and moves 2.0 m horizontally along the floor. What is the cart's final kinetic energy?

Stats
A random sample of two hundred fifteen adults is selected from a certain population of registered voters. Assume the population is 20% democrats. Use a normal approximation to estimate (a) the probability the sample contains exactly 48 democrats, and (b) the probability the sa...

math
if you simplify the expression 3x+4(x-2)-3x into the expression 3x+ 4x -8-3x, what property did you use associative property commutative property distributive property identity property

Chem
Could you please tell me if these are right? How many moles are in the following. A.) 80.0 g of NaOH I got 2.0 moles. B.) 12.0 g of Ca(OH)2 I got 0.16 moles. Write the simplest formula for each of the following compounds. A.) 0.200 mole Al and 0.600 Cl. I got AlCl3 B.) 0.080 m...

chem-Bob
What pressure (atm) is exerted by a column of ethanol 65.0 cm high? The density of ethanol is 0.789 g/cm3 and 9.8m/s2 as your gravitational constant. mass*gis the weight of the column density*h*area*g= weight density*h*g= pressure Thanks for your help Bob. The answer i got is...

Chem
The relationship between volume and pressure (at constant temperature) is directly proportional. my answer- True The relationship between pressure and temperature (at constant volume) is inversely proportional. my answer- True The relationship between volume and temperature (a...

physics
What pressure (atm) is exerted by a column of ethanol 65.0 cm high? The density of ethanol is 0.789 g/cm3 and 9.8m/s2 as your gravitational

physics
need some help, A ball with an initial angular velocity of 20.0 rads /s and a rotational inertia of 0.4kgm rolls uphill with an acceleration of -4.00 rad/s . Calculate the net torque acting on the ball. Calculate the angular displacement after 5.00 s.

accounting
You can invest in 10 corporate bonds paying 7 percent interest 20 conservative stocks that pay substantial dividends(typically 5 percent of the stock price every year) and 30 growth oriented-technology stocks that pay no dividends. Analyze each alternative and select one.

CHEM
Could you please tell me if these are right? Write an equation for the following reactions. Write the correct formulas of the reactants and products. Then correctly balance each equation. A.) Potassium and oxygen gas react to form potassium oxide. I got K+O2=KO2 B.) Sodium and...

Intro to Science
A rock with a Weight of 156.8 newtons falls 5 meters. What potential energy does it have left before the end of its fall?

5th grade math
I don't get how to express the fraction 30/100 in 20ths.

economics
do you believe there are opportunity costs to furthering your education. if so what are they if not why

Math
Divide.round to the nearest hundredth.2.4 Divide by 9.984

chem
A gold nugget weighs 65.0 g. How many moles of gold are in the nugget? I got 12800 moles is this right?

physics
A ship sets out to sail to a point 174 km due north. An unexpected storm blows the ship to a point 132 km due east of its starting point. How far must it now sail to reach its original destination? In what direction must it now sail to reach its original destination?

algebra
Your friend has a cube of gold. You have a cube of gold that weighs twice as much. Your cube is 1.26as long as your friends, and it has 1.587 times the surface area. You can imagine how this would work with a spherical diamond, so we won't repeat that part here. Here is an...

economics
explain how the wage can adjust to balance the supply and demand for labor while simultaneously equaling the value of the marginal product of labor

Chemistry
CO2-3

economics
Do you feel there are any imbalances to our wage structure in our economy?

Chemistry
Is it possible to do it without stoich?

Chemistry
is that stoichiometry?

Chemistry
Suppose you tried to combine 42 grams of magnesium with 45 grams of oxygen. Which of the two substances would be left after the reaction? How much magnesium oxide will be formed?

Chemistry
why 12/44?

Chemistry
When one pound of gasoline (made up of compounds of hydrogen and carbon) is burned in an automobile approximately 3 pounds of carbon dioxide, CO2, is given off. Carbon dioxide is one of the gases contributing to global warming. What information from this experiment helps expla...

english
At three pm i will be feeding the ducks.At the park. is this sentence a fragment

Chemistry
6.00M*.520L= 3.12Moles of NaOH 3.12 mols*40= 124.8 grams of NaOH

6th grade English
Each family of potters has its own special designs. I have to identify the action verb. Would it be has?

7th grade
What is a 12 letter word for observations involving descriptions based on instrument measurment?

college-accounting
Choose two competitor companies that are U.S. GAAP publicly traded companies.

economics
name two competitor companies that are U.S. GAAP publicly traded companies

economics
out of the four economic market models : competitive market, monopoly market, monopolistic competition and oligopoly in your opinion which is the best market model and which is the worst

Gym
Does anybody know anything about Tim Tebow? I have to write an essay on him.

History
I learned what these terms are, but I still want to know how they are important to geek history.

History
How are peninsulas, city-states, and polytheism important to greek history?

Social Studies
I want to know Europe's relative location. Please help.

economics
out of the four economic market models : competitive market, monopoly market, monopolistic competition and oligopolywhich is the best market model and which is the worst

economics
out of the four economic market models which is the best market model and which is the worst

history
the differences between asia, eurasia,and europe and the impact it had on the international state of affairs in 1450

history
how were the differences important to the international state of affairs in 1450?

economics
What did the study described in “The Value of Human (?) Capital” train low ranking monkeys to do?

economics
When policymakers set prices by legal decree, they a. improve the organization of economic activity. b. obscure the signals that normally guide the allocation of society’s resources. c. are usually following the advice of mainstream economists. d. are demonstrating a will...

economics
Two goods are complements when a decrease in the price of one good a. decreases the quantity demanded of the other good. b. increases the quantity demanded of the other good. c. increases the demand for the other good. d. decreases the demand for the other good.

math
so is 0.09524 move decimal two places to the right is it 9.52%or is it 9.524%

math
how would i write 0.09524 as a percentage is it 95%

math
what is the average of 45 and55

math
how would i find the range for these set of numbers -12,19,12,10,-24,1,-1

math
I want to see if am right the average is 1245/15=83 so what is the median its the 8 th number right so is it 83

6th grade English
The local museum showcased American Indian pottery. I have to identify the adjectives and the proper adjectives. local-adjective American Indian-Proper adjective

statistics
I dont know how to do ANY OF IT. I'm so lost

statistics
Job Sat. INTR. EXTR. Benefits 5.2 5.5 6.8 1.4 5.1 5.5 5.5 5.4 5.8 5.2 4.6 6.2 5.5 5.3 5.7 2.3 3.2 4.7 5.6 4.5 5.2 5.5 5.5 5.4 5.1 5.2 4.6 6.2 5.8 5.3 5.7 2.3 5.3 4.7 5.6 4.5 5.9 5.4 5.6 5.4 3.7 6.2 5.5 6.2 5.5 5.2 4.6 6.2 5.8 5.3 5.7 2.3 5.3 4.7 5.6 4.5 5.9 5.4 5.6 5.4 3.7 6.2...

physics
King Arthur's knights fire a cannon from the top of the castle wall. The cannonball is fired at a speed of 45 and an angle of 28 above horizontal. A cannonball that was accidentally dropped hits the moat below in 1.6 .

economics
Help please You are a utilitarian social planner and have a very limited number of vaccines to a new and potentially deadly virus. How do you allocate them? Do you: (A) give them to specific groups, such as high-risk populations, or (B) sell them to the highest bidder and reba...

Botany
I need a labeled diagram of Cytokinsis Mitosis of the lily

economics
You are a utilitarian social planner and have a very limited number of vaccines to a new and potentially deadly virus. How do you allocate them? Do you: (A) give them to specific groups, such as high-risk populations, or (B) sell them to the highest bidder and rebate the reven...

Microscopes
What is the RESOLVING POWER of a electron and light microscope?

Microscopes
What is the resolving power for light microscopes, and what is it for electron microscopes?

Biology
Why is the maximum resolution and magnification of a light microscope less than the electron microscope?

economics
Are there times when one’s use of the police force diminishes the use for others? If so, can it be defined as a public good?

parenting
Ok, you all need to take notes, there are two rules to parenting: Rule One- all children are the parent's 1st priority, always and forever, if you cannot put your children 1st, you have no business being a parent. Rule Two- See rule one This is just common sense people, if...

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