Friday
August 1, 2014

Posts by John


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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