Thursday
April 24, 2014

Posts by tyler


Total # Posts: 658

Physics
An airplane needs to fly due south. The plane can fly at a speed of 720.0 km/hr in still air. If there is a wind blowing to the northeast at 70.0 km/hr, in what direction should the plane fly to maintain its heading of due south? How long will it take to fly a 1500.0 km distance?

chemistry urgent
NH4NO3(s)+H2O(l)→NH4NO3(aq) ΔH = +25.7 kJ. What is the final temperature in a squeezed cold pack that contains 45.5g of NH4NO3 dissolved in 125 mL of water? Assume a specific heat of 4.18J/(g⋅∘C) for the solution, an initial temperature of 29.0∘C, ...

Chemistry
Calculate ΔH∘f (in kilojoules per mole) for benzene, C6H6, from the following data: 2C6H6(l)+15O2(g)→12CO2(g)+6H2O(l) ΔH∘ = -6534kJ ΔH∘f (CO2) = -393.5kJ/mol ΔH∘f (H2O) = - 285.8kJ/mol

Chemistry
Assuming that the specific heat of the solution is 4.18 J/(g⋅∘C) and that the calorimeter itself absorbs a negligible amount of heat, calculate ΔH in kilojoules for the reaction CaO(s)+H2O(l)→Ca(OH)2(aq) When 1.045 g of CaO is added to 50.0 mL of water a...

Math
Can someone please work out the steps in solving this elimination problem. Thank you. The problem is x + 2y = -7 x - 5y = 7

social studies
What were the results of the Korean War? What impact did it have on American society?

Math
Solve by elimination x + 2y = -7 x - 5y = 7

Math/Physics
John is driving at a constant speed of 20.0 m/s when he passes Jane, who is traveling in the same direction at 15.0 m/s at the moment that John passes her. If Jane is accelerating at 2.0 m/s2, how far will Jane drive before she catches up to John? How much time passes from whe...

Physics
A crate begins sliding down a frictionless incline of 25.0o. If the objects begins sliding from rest and takes 1.50 sec to slide down the incline, what is the speed of the crate as it leaves the incline? How long is the incline?

Physics
John is driving at a constant speed of 20.0 m/s when he passes Jane, who is traveling in the same direction at 15.0 m/s at the moment that John passes her. If Jane is accelerating at 2.0 m/s2, how far will Jane drive before she catches up to John? How much time passes from wh...

Physics
Draw each of the following vectors on graph paper, then find the x- and y- components. Make sure to include units in your answers for the components. a) ⃑r = (65 m, 30degrees above the positive x-axis) b) ⃑v = (125 m/s, 40degrees below the negative x-axis) c) ͈...

Calculus
negative one third t minus 1

Calculus
Two full 48-gallon tanks begin draining at t = 0. Tank Alpha's volume is changing at a constant rate of -16/5 gal/min. The rate at which Tank Bravo's volume is changing is given by r(t)=-1/3t-1 gal/min. a) How much water is in each tank after 5 minutes? b) Which tub dr...

Physics
A cubic meter of some material has a mass of 6400 kg. The block of material is lowered into a lake by a strong cable until the block is completely submerged. Draw a free-body diagram for the block. (Do this on paper. Your instructor may ask you to turn in your work.) Find the ...

science
30 cubic meters of argon gas are kept under constant pressure. The gas is heated from 10.0 degrees Celsius to 293 degrees Celsius. What is the new volume of the gas?

physics
A DC circuit has a single battery of voltage V = 10.0 V attached to a resistor R = 100 Ohms. If the voltage is increased to 20.0 V, then by what factor does the power emitted by the resistor increase?

Physics
A 2 kg ball is rolled down a hill 25 m tall. When it reaches the bottom of the hill it is traveling at 15.1 m/s. How much energy was dissipated due to friction?

physics
an unpolarised light is incident on the boundary between two transparent media. State the contition when the reflected wave is totally plane polarised.

Physics
It takes 56 J to push a block 4 m. If the force is in the same direction as the displacement, what is the force on the block?

English
Presents I think

Please Help with 2 Physics Problems???
1) In a two-dimensional tug-of-war, Alex, Betty, and Charles pull horizontally on an automobile tire at the angles shown in the picture. The tire remains stationary in spite of the three pulls. Alex pulls with force FA of magnitude 207 N, and Charles pulls with force FC of mag...

Math
Thank you Reiny

Math
Can someone help me to solve this scientific notation equation. (5.7 x 10^3)^-^4

Physics
A car accelerates from 12m/s to 25m/s in 6.0s. What is its uniform acceleration? How far did it travel in this time?

Physics
A plane flies 407 km east from city A to city B in 44.0 min and then 871 km south from city B to city C in 1.90 h. For the total trip, what are the (a) magnitude (in km) and (b) direction of the plane's displacement, the (c) magnitude (in km/h) and (d) direction of its ave...

Statistics
Determine if the following are probability distributions (if no, state why). a. X 3 6 9 12 15 P(X) 4/9 2/9 1/9 1/9 1/9

algebraic expressions
write a situation that can be represented by the algebraic expression 3.25d

Statistics
What does the empirical rule say about the proportion of players who are between 62.7 inches and 75.3 inches? c.

Pre-Algebra
The treasurer of the student body at a college reported that the receipts from a recent contact totaled $916; Furthermore, he announced that 560 people had attended the concert. Students were charged $1.25 each for admission to the concert, and adults were charged $2.25 each. ...

Science
which of the following do rain forests and taiga have an common? A. similar average annual rainfalls. B. similar average annual temperature C. heavily populated with trees. D. tend to occur in similar latitudes

Math
Yes

Math
Snooki has a total of 25 quarters and pennies in her pocket. She has $2.32 altogether. How many quarters and pennies were sold?

World History ;-;
Which of the following was a result of the development of Christianity in the Byzantine empire?

Stats
Suppose the following data are selected randomly from a population of normally distributed values. 42 51 43 48 41 57 54 39 45 48 45 39 46 Construct a 95% confidence interval to estimate the population mean. Round the intermediate values to 2 decimal places. Round your answers ...

Chemistry
1) A dog has the same mass for 3 years. State whether this represents an equilibrium or steady state situations, and give your reasons. I'm not sure if I got this question right... I think this is a steady state because the dog is opened to the environment where oxygen is ...

Chemistry
For the reaction Zn(OH)2(s)+4CN-(aq)->Zn(CN)4 2-(aq)+2OH-(aq) find [CN-] when 8.5 g of Zn(OH)2 are dissolved in 1.00 L of solution.

physics
a .150kg object tied to a string is whirled in a horizontal circle ata constant angular speed of 3.50 revolutions per second. the tension is the string is 75newtons. what is the length of the string?

Can someone check these answer for me?
1. B 2.B 3.D 4.D 5.A

Can someone check these answer for me?
is someone on

science help plzzz
PLEASE HELP

science help plzzz
1. A 2.D 3.B 4.C 5.B

Chemistry
8======D

Physics
A "swing" ride at a carnival consists of chairs that are swung in a circle by 19.8 m cables attached to a vertical rotating pole, as the drawing shows. Suppose the total mass of a chair and its occupant is 144 kg. (a) Determine the tension in the cable attached to th...

Physics
At an amusement park there is a ride in which cylindrically shaped chambers spin around a central axis. People sit in seats facing the axis, their backs against the outer wall. At one instant the outer wall moves at a speed of 3.44 m/s, and an 64.3-kg person feels a 277-N forc...

Physics
A centrifuge is a device in which a small container of material is rotated at a high speed on a circular path. Such a device is used in medical laboratories, for instance, to cause the more dense red blood cells to settle through the less dense blood serum and collect at the b...

chemistry
Calculate the number of hydrogen molecules formed when 5.6 mL of ammonia at STP is decomposed by the following reaction: ___NH3 „³ ___ N2 + ___ H2

chemistry
Calculate the volume of oxygen at STP required to burn 3.7 kg C3H6O2 producing CO2 & H2O:

SAT prep math
Maria has two piggy banks. In one piggy bank she saves dimes and in the other she saves nickels. At the end of each month she saves 40 nickels and 30 dimes

Physical Science
a student is given a 10 gram sample of gold that has a density of 19.32g/cm3. The student is then given a 5 gram sample of an unknown substance and told the density of the unknown substance is 19.32g/cm3. What is the unknown substance

chemistry
determine the mass of CO2 produced when 51.2 g of CaO is reacted with 50.0 g of C according to the unbalanced equation CaO + C --------CaC2 =CO2

chemistry
in the reaction of magnesium metal with hydrochloric acid to produce magnesium chloride and hydrogen gas. If 4.59 mol of magnesium and 4.59 mol of hydrochloric acid are reacted, how many moles of magnesium chloride are produced ?

Please Help with calculus
How to evaluate x=0 and dx=-.03? I got(1/9)e^(x/9)dx as dy of e^(x/9)and I don't know how I should plug them in.

Calculus
Let y=e^(x/9). a) Find the differential dy. dy = b) Evaluate dy if x=0 and dx=−0.03. dy =

Calculus
Find the linear approximation L(x) of ln(x) at the point a = 12.

Calculus
Find the equation of the tangent line to the curve (piriform) y^2=x^3(4−x) at the point (2,16−−ã). a. Find dy/dx at x=2. dy/dx= b. Write the equation of the tangent line to the curve.

Calculus
Find the linear approximation L(x) of ln(x)at the point a = 12.

Calculus
The radius of a circular disk is given as 51 cm with a maximum error of 0.04 cm. Use differentials to estimate the maximum error and percent error in the calculated area of the disk.

english
please answer the last question

english
give two examples in the giant's house for character, theme, plot, style, point of view

chemistry
How much carbon dioxide gas is there in a 34.3 L container at 34.0◦C and 5.49 atm? answer in grams

Calculus
Evaluate the following limit, if it exists: lim h-->0 ((sqrt9+h)-3/(h)

Calc
Oscar Corporation is planning to construct an elliptical gate at its headquarters. The width of the ellipse will be 5 feet across and its maximum height along the center will be 3 feet. The company wants to place two bright spots at the foci of the ellipse. How far from the ce...

math
kate cut a pizza into fourths. karl cut a pizza of the same size into sixth. After they each ate some pizza, they had the same fraction of pizzas left. What fraction of each pizza was left?

pre calc
Find all solutions of the equation tan^5 x - 9tan x =0. The answer is Ak\pi where k is any integer, the constant A= ??.

math
Find all solutions of the equation 3sin^2 x -7sin x +2 = 0 in the interval [0,2\pi). The answer is x_1= ? and x_2= ? with x_1<x_2.

since and cosine please help me!
that is not right according the program

since and cosine please help me!
Simplify and write the trigonometric expression in terms of sine and cosine: ((2+tan^2 x)(sec^2 x))-1 = (f(x))^2 f(x)= ???

sine and cosine
Simplify and write the trigonometric expression in terms of sine and cosine: sin x + (cot x)(cos x) = (1/f(x)) f(x)= ?

cosine and sine HELP!
Simplify and write the trigonometric expression in terms of sine and cosine: ((2+tan^2 x)(sec^2 x))-1 = (f(x))^2 f(x)= ???

math
Simplify and write the trigonometric expression in terms of sine and cosine: sin x + (cot x)(cos x) = (1/f(x)) f(x)= ?

chemistry
Thimerosal is an organic compound (gram molecular mass = 404.8 g/mol) used to inhibit bacterial growth. A .100%solution of thimerosal is sometimes used as an antiseptic. Assume that this solution has a density of 1.00 g/mL. A. how many grams of thimerosal are found in .500 g o...

math
Simplify and write the trigonometric expression in terms of sine and cosine: sin x +(cot x)(cos x) = 1/f(x) f(x)= ?

math
If tan^2(t) - sin^2(t) = sin^a(t)\cos^b(t), then the positive power a = the positive power b =

math
2a2+5a-25=0

phisics
If You do 100 j of work to elevate a bucket of water,what is its gravitational potential energy relative to its starting position?

angles
A survey team is trying to estimate the height of a mountain above a level plain. From one point on the plain, they observe that the angle of elevation to the top of the mountain is 25 degrees. From a point 1225 feet closer to the mountain along the plain, they find that the a...

trig
The radian measure of an angle of 182 degrees is ?

math
The radian measure of an angle of 182 degrees is

Pre calulus only 15 min left HELP!
((ln(x))^1/2)/(ln(x^1/2))=6 solve for x

Physics
500 calories of heat is added to 2.0 g of water at 80 degrees Celsius. How much steam is produced?

math
write the metric unit of length that is reasonable. a door is about 1 blank wide

Math
The sum of twice a number and another number is 24. The difference of twice the first number and the other number is 12. Which system would model this situation, and what is the solution?

math
what is answer of 7 cubed

math
A certain brand of cereal costs $3.25 per box before sales tax is added. When you buy 5 or more boxes of this cereal you receive 1 additional box for free. What is the average cost per box of cereal for 6 boxes before sales tax are added ? Please helpp

English
What is the significance of the repetition of the word absurd in the play?

math
jeff bought 6 pairs of shoes and 4 jerseys for 560. Jersies cost 1/4 price of one pair of shoes. Find price of shoes and price of jersey

Chemistry
1. Pentane gas (C5H12) combusts with oxygen gas (O2) to form water (H2O) and carbon dioxide (CO2). Write a balanced chemical equation for this reaction and explain the scientific principle (statement) that requires the balancing of an equation to make it conform to reality

math
A group of 132 students chose baseball and soccer as their favorite sports in the ratio of 3:8. How many students chose soccer as their favorite sport?

physics
a mechanic uses a chain and bloc pulley to lift a 875-kg engine 4.0 m to the top of the garage. the downward force on the chain over the 4.0 m distance is 5.0 x 10^4 N. a)calculate the work done in raseing the motor b)how much useful work was done c)what is the inefficiency of...

science
When scientists use one of their five senses to gather information, they are?

math
sam cut a pie into equal slices. there are only 3 slices left. the angle measures for the three slices is 72 degrees. how many slices did sam cut the pie into?

math
At a festival, 2/7 of the number of girls was equal to 3/5 of the number of boys. There were 165 fewer boys than girls. How many children were at the festival in all?

math
Madison spent 5/8 of her savings on a microwave oven & a refrigerator. She used 4/7 of the amount she spent to buy the refrigerator. The refrigerator cost $280 more than the microwave oven. How much savings did Madison start with?

Science
Nevermind, I was looking and I just found the help I needed :)

Science
If you are asked to determine an object’s speed, what information must you have? A.distance and period of time B.distance and change in position C.period of time and direction D.distance and direction

physics
220

Phusics
Does an object moving in the y direction have KE? If so if you apply a force in the Y direction will the velocity increase?

physics
You have a conversation of EP and with that you have the formula: Mbull*Vi+Mwood*Vi=(Mb+Mw)Vf .o15kg*Vi+15*0=(.015+15)Vf Mult. by 0: .015kg*Vi=(.o15+15)Vf So we can't solve that (i guess we cant curse here) but we move on to where the spring compresses, there is conservati...

physics
You have a conversation of EP and with that you have the formula: Mbull*Vi+Mwood*Vi=(Mb+Mw)Vf .o15kg*Vi+15*0=(.015+15)Vf Mult. by 0: .015kg*Vi=(.o15+15)Vf So we can't solve that but we move on to where the spring compresses, there is conservation of TME so: 1/2(Mb+Mw)Vf^2=...

English
Out side

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