Friday

August 1, 2014

August 1, 2014

Total # Posts: 6,202

**chemistry**

1211

**physics**

A 2kg and a 4kg hang freely at opposite ends of a light inextensible string which passes over a small and light pulley fixed to a rigid support calculate the acceleration of the system

**Math**

Factor pls show me steps thank u! (X-1)(x+2)^2-(x-1)^2(x+2)

**chemistry??**

Oxidising and reduction- Chemistry? Oxidation and reduction can be described as the loss and/or gain of electrons from an ion or atom (species) in a chemical reaction. For thefollowing aqueous reaction, select the species that is oxidized and similarly the one that is reduced:...

**math**

300 hundred kids attend a dance. The ratio of boys to girls is 6 to 4. If 30 boys and 20 girls leave, what is the new ratio of boys to girls still at the dance

**chemistry please help**

thanks

**chemistry please help**

The reaction between hydrogen and chlorine gases gives hydrogen chloride gas in the following reaction: H2(g) + Cl2(g) = 2HCl(g) It is found experimentally that 1 mole of H2 gas reacts with 1 mole of Cl2 gas at constant temperature and pressure, to release 184 kJ of heat. What...

**chemistry hellllllllllllllllllp**

you mean Al^3+ is oxidized ,Ag^+ is reduced.

** PHYSICS HELP**

Back in the stage coach era, iron rims were placed on wooden wheels by shrink-fitting. Suppose that the wheel has a diameter of 100.00 cm, whereas the rim has an inside diameter if 99.75 cm at 20°C. How hot must the iron rim be heated if it is to be slid over the wheel? (...

**physics**

A 4.75 mass was dropped from a certain height and achieved a maximum velocity of 7.68 m/s just before striking the ground. Determine the height from which the mass was dropped. Ignore air drag.

**mechanical science**

a c accelerates from rest in a straight line. after 12 seconds, it's velocity is measured as 42 m/s. use one of the linear equations of motion to calculate the car's acceleration

**Chemistry**

Chlorine gas + aqueous sodium bromide --> aqueous bromine + aqueous sodium chloride. I got: Cl2+2NaBr2(aq)-> Br2(aq)+2NaCl2(aq) Is this right ?

**Ant**

10. Diffusion means: a. cultural traits are expressions of our biology. b. the environment is responsible for culture change. c. cultures borrow ideas, material items, and concepts from each other. d. people are often unwilling to move to new locations.

**Chemistry**

Thanks

**Chemistry**

A radioactive element has a half-life of 6.41 days. What percent of the original sample will be left after 15.0 days?

**trigonometry**

A ship at A is to sail to C, 56km north and 258km east of A. After sailing N25°10’E for 120mi to P, the ship is headed toward C. Find the distance of P from C and the required course to mean C.

**trigonometry**

A ship at A is to sail to C, 56km north and 258km east of A. After sailing N25°10’E for 120mi to P, the ship is headed toward C. Find the distance of P from C and the required course to mean C.

**Spanish**

Le deseo

**Probability**

Mary took a 20 question multiple-choice exam where there are 4 choices for each question and only 1 of those choices is correct. Rather than reading the question, Mary simply puts a random choice of answer down for each question. Determine the probability that Mary gets exactl...

**chemistry**

can anyone give me 2 example of chiral molecules structure plz

**chemistry help !!!!!!!!!!!!!!!!**

H2(g)+Cl2(g)=2HCL(g) it is found experimentally that 1 mole of H2 gas react with 1 mole of CL2 gas at constant temperature & pressure , to release 184kJ of heat .what is the enthalpy change for this reaction? ∆H=

**Algebra 1**

23. Tom has a collection of 30 CDs and Nita has a collection of 18 CDs. Tom is adding 1 CD a month to his collection while Nita is adding 5 CDs a month to her collection. Find the number of months after which they will have the same number of CDs.

**algebra 2**

identify the vertex, axis of symmetry and the dirction of opening for y=-(x-6)^2-5

**Help math plz**

A firm is deciding whether or not to place a product on the market. They envisage three posible market reactions: high demand, moderate demand, and low demand. If demand is strong they expect to sell 200,000 a month of the good; moderate sale levels are expected to be 100,000;...

**History**

Confucian teachings centered on harmony and order resulting from a. the end of ancestor worship b. harsh rule of chinese emperors c. the removal of Mongol influence from Chinese culture d. harmonious relationships from individuals e. meditation and prayer I think it is d but a...

**basic algebra**

Thankyou so much!!

**basic algebra**

we have to factor not solve

**basic algebra**

1) 2x²-7x-15 2) 9x²+24x+16 Can you show me all the steps...i dont know how to do it...Thankyou!!:)

**math**

HAPPY NEW YEAR!! TO ALL THE TUTORS WHO HAVE HELPED ME!! ESPECIALLY MS.SUE...I won't be on new years so am wishing earler...I apprecate all your help.. Thankyou very much!

**maths help plz!**

e=√d/ab make d the subject ,do not include the bracket .thanks

**Language Arts **

Approximately how long is the shadow of the Washington Monument at 3:00 pm in July?

**Science**

A skier of mass 75 kg accelerates from rest down the slope as shown in the diagram (It's a triangle with a height of 300 m, length of 400 m, and the hypotenuse is 500 m; The skier is on the hypotenuse. At the bottom of the slope, he is travelling at 40 m/s. What is the ave...

**Religion**

The Gospel of John uses High Christology in its account of Jesus’ life. First, define High Christology. Then, describe 2 ways that John depicts Jesus using High Christology and give examples for each from the gospel.

**English**

Well I have some things from an article: opposition of life and death, living in order to move closer to death All life is a movement toward death, Neruda associates time with death time symbol serves as a bridge between the related themes of death and of solitude

**English**

Thanks for responding. I would like to know the significance of these subthemes, as I am having some trouble explaining them

**English**

What is meant by the subthemes: death as pervading life, time as the essence of death and self destruction, night as the environment of death, and death as the great isolator as applied to Pablo Neruda's poems, especially Residence on Earth?

**Phamacology**

A patient is prescribed digoxin. The patient’s apical heart rate is 58 beats per minute. What is the nurse’s best action?

**social studies**

What is wrong with him???? its A but one more thing............................................ ITS ME MEAT :) YOLO!!!!!!!! AGIN LOLOLOLO

**Physics**

The drawing shows a skateboarder moving at 6.41 m/s along a horizontal section of a track that is slanted upward by 47.4 ° above the horizontal at its end, which is 0.612 m above the ground. When she leaves the track, she follows the characteristic path of projectile motio...

**Physics**

You are trying to lose weight by working out on a rowing machine. Each time you pull the rowing bar (which simulates the "oars") toward you, it moves a distance of 1.32 m in a time of 1.22 s. The readout on the display indicates that the average power you are produci...

**Chemistry**

15. 120 g of sulfuric acid are added to 230.0 g of barium peroxide. Which reactant is in excess and by how much? How much barium sulfate is precipitated in this reaction???? HELP please

**math**

sorry,i am still not understand

**math**

4 students are sitting to receive the prizes.Alan and Julia wanted to sit together, how many different arrangements of students would there be ?

**vocabulary**

for the words listed below,write an additional word that is part of the same word family.

**statistics**

The mean annual income of employees who took a statistics course is greater than $60,000.

**English**

Are the other answers correct? Now I think he began to hear strange noises, but they didn't frighten him is a independent clause (just one and not two)

**English**

When the campfire was burning steadily is dependent All the campers sat on the ground around it Independent Someone began to tell a story Independent After he had been in the house for an hour or so Dependent He began to hear strange noises. Independent They didn't frighte...

**English**

What are the dependent and independent clauses in the following sentences? When the campfire was burning steadily, all the campers sat on the ground around it, and someone began to tell a scary story. After he had been in the house for an hour or so, he began to hear strange n...

**John**

Thanks!

**John**

The family planned outdoor activities for every day of vacation; however, bad weather interfered with the plans. Compound? What we learned about France made us eager to visit that country, but we don't save money quickly, so the trip will not come soon. Compound complex

**John**

First is simple Second is complex

**John**

Top sentence is complex Bottom sentence is simple

**John**

How about these? The most valuable of the prizes was wrapped in tattered and dirty paper. People who expect special treatment are often disappointed.

**History**

Does anyone know? Please!

**History**

Which group felt that Peter's reforms to the Russian Orthodox Church were too much change for the Church. Holy Synod Old Believers foreigners Streltsy Serfs Cossacks Not sure maybe Holy Synod but help would be greatly appreciated

**Calculus**

Im confused on the "There are six (and only 5)" part. and How would you solve it without the I'Hospital's Rule? We haven't learned that yet.

**Calculus**

The answer to the equation is -1/2. The parens are correct. But I was wrong on the limit. It is lim s->-1

**Calculus**

lim x->2 (((1/(sqrt(2+s))-1)/(s+1))

**physics**

A person exerts a force of 6.0 N at a point which is 90 cm from the hinged side of a door. If the torque is 5.2 N m then determine the angle between the force vector and the line that runs directly from the point to the hinged side.

**Chemistry**

please explain how % error and % yield would have effected the mass/moles of a substance in a reaction in a lab. In this case mass/moles of NaCl. NaHCO3+ HCl--> NaCl + CO2 + H2O

**AP PHYSICS HELP**

One piston of a hydraulic lift holds 1.40*10^3 kg. The other holds an ice block (density= 917 kg/m^3) that is 0.076 m thick. Find the first piston's area. (Cross sectional area of the ice block = cross sectional area of the piston).

**math**

we decided on a new logo for t-shirt,it was to be 3 stripes,each stripes could be one of 2 different colors,how many different logos could we make

**Physics**

In Figure 9-61, block 1 (mass 2.0 kg) is moving rightward at 8 m/s and block 2 (mass 4.8 kg) is moving rightward at 2.8 m/s. The surface is frictionless, and a spring with spring constant of 1180 N/m is fixed to block 2. When the blocks collide, the compression of the spring i...

**AP PHYSICS HELP**

Thanx!!!!

**AP PHYSICS HELP**

A 1.47 x 10^6 kg steel hull has a base that is 2.5 x 10^3 m^2 in area. If it is placed in sea water (density= 1025 kg/m^3), how deep does the hull sink?

**science**

Consider a single electron in a 1dimensional box with size a, What is the expected position <x> of the electron at the second excited state? What is the expected value of linear momentum at the ground state ?

**Life Science**

Name one plant and one animal that previously lived in Antarctica, but are now extinct throughout the entire world.

**Reading**

Can anyone help me with 12?

**Math**

When (5x^6+10x^5+2x^4+19x^3+2x^2+1)^10000 is multiplied out, what is the coefficient of x^4?

**math**

idk

**math**

anser it

**math**

What is the degree of the polynomial -2?

**college physics**

191.1

**Physics**

A skateboarder enters a ramp at 5 m/s, skates down it and exits at 14 m/s. What was the Height of the ramp? A. 8.7 m B. 85.5 m C. -1.2 m D. 3m E. 1.2 m Pls show work !

**Physics**

The work required to bend a steel beam with a spring constant of 10^6 n/m is 5 j. If it is treated like a perfect spring, what is the displacement of the beam? A. 3.2 mm b. .03 m C. 2.5m D. 0.026 m e. 0 Pls show work thank u!

**Physics**

A block with a mass of 2.5 kg on a frictionless track collides and sticks to a stationary block with a mass of 1.75 kg and the two more together at a velocity of 3.5 m/s. What was the velocity of the first block? A. 2.5 m/s B. 7.5 m/s C. 6.0 m/s D. 0.6 m/s E. 0 m/s pls show wo...

**Chemistry**

What volume (in mL) of 0.45 M Na2SO4 solution is needed to precipitate all the barium, as BaSO4(s), from 14.5 mL of 0.15 M Ba(NO3)2 solution? Ba(NO3)2(aq) + Na2SO4(aq)= BaSO4(s) + 2 NaNO3(aq)

**Chemistry**

Never mind. I got it

**Chemistry**

How many grams of CuCl2 are required to prepare 1270. g of a 1.75% (by mass) CuCl2 solution?

**Chemistry**

What's the linear density of body center cubic (0,1,1)of Molybdenum

**chemistry**

How would you prepare the following solution? a)2% NaCL(w/v) b).35M glucose C)0.12M CaCl2 For b I got glucose 0.35=wt/180=63gm/L, but not sure if I'm doing it right.

**Physics 1**

A catapult 100 m long launches a 3.0 x 10^4 kg jet from the deck of a carrier. Starting at rest, the plane takes off with a speed of 80 m/s. Find: a)The acceleration, b) the average force, c) the work done, d) time to accelerate , e) the power developed.

**Pre-calculus**

what does sqrt mean?

**Pre-calculus**

You are given a 12"x18" piece of construction paper. You are to cut a square out of each corner in order to create a 3-dimensional open-top box. What size squares would you need to cut in order to maximize the volume of the box?

**physics**

tyvm :)

**physics**

Air consists of molecules of several types, with an average molar mass of 28.95 g. An adult who inhales 0.6 L of air at sea level takes in about how many molecules? (The density of air is 1.229 kg/m^3, and the molar mass of air is 28.95 g/mol.)

**math**

4x+3=15

**math**

write a situation with a algebraic exprassion that can reprsened x+3

**Science**

A car speeds over the top of a hill. If the radius of curvature of the hill at the top is 14.27 m, how fast can the car be traveling and maintain constant contact with the ground?

**MATH PLEESE HELP ITS URGENT**

A is 11 by 11 B is 11 by 13 c is 13 by 13 total area is 433 m2 area of B is 143 m2 total perimeter is 96 m

**Chemistry**

How many moles of CO2 would be expected to be produced from 0.00639 moles of sodium carbonate?

**physics**

A helicopter flies over the arctic ice pack at a constant altitude, towing an airborne 195-kg laser sensor which measures the thickness of the ice (see the drawing). The helicopter and the sensor move only in the horizontal direction and have a horizontal acceleration of magni...

**question about making reference**

i'm completely lost. the only thing i found helpful is this. "For multiple articles by the same author, or authors listed in the same order, list the entries in chronological order, from earliest to most recent." still i dont have any idea.

**question about making reference**

forgot to add. i'm using APA style

**question about making reference**

what is the right way to cite this? all the info comes from 1 book but different pages. Martin Kantor (2003). Distancing: Avoidant Personality disorder. Road West, Westport: Praeger publishers. Pp. 13-14. Martin Kantor (2003). Distancing: Avoidant Personality disorder. Road We...

**chemistry**

75g of FeCL3 are dissolved in 700 mL of solution, what is the concentration of Fe3+ ions? what is the concentration of Cl- ions?

**physics**

A duck has a mass of 2.70 kg. As the duck paddles, a force of 0.130 N acts on it in a direction due east. In addition, the current of the water exerts a force of 0.210 N in a direction of 52.0 ° south of east. When these forces begin to act, the velocity of the duck is 0.1...

**physics**

An electron is a subatomic particle (m = 9.11 x 10-31 kg) that is subject to electric forces. An electron moving in the +x direction accelerates from an initial velocity of +5.46 x 105 m/s to a final velocity of 2.25 x 106 m/s while traveling a distance of 0.0803 m. The elect...

**physics**

An airplane has a mass of 3.41 × 104 kg and takes off under the influence of a constant net force of 2.57 × 104 N. What is the net force that acts on the plane's 78.8-kg pilot?

**English and grammar**

i need someone to check my work but i cant just copy it and paste it here. i need to send it via e-mail. please give me your email add and ill send it to you. thanks

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