Wednesday

October 1, 2014

October 1, 2014

Total # Posts: 2,084

**chemistry**

correct answer is: -5133.3-[(8x-393.5)+9(-241.8)] = 190.9 since it is an enthalpy of formation, the value has to be negative, thus the correct answer is -190.9
*January 29, 2012*

**physics**

A 0.25 kg cube of iron is heated and its temperature rises from 23.0 C to 45.0 C. How much heat entered the cube in Joules and in Calories?
*January 26, 2012*

**physics**

anyway can you help me solve this problem please
*January 19, 2012*

**physics**

yes i did pay but they are not going to help
*January 19, 2012*

**physics**

yea i put in masterphyics hw and it said its wrong i did it 3 times this question is driving me crazy
*January 19, 2012*

**physics**

A helicopter 7.60m above the ground and descending at 3.90m/s drops a package from rest (relative to the helicopter). We have chosen the positive positive direction to be upward. The package falls freely. part A- Just as it hits the ground, find the velocity of the package ...
*January 19, 2012*

**math**

Scott uses three 14 gallon tanks of gas a month. What is the average number of gallons he uses daily in a 30 day month? Give your answer to the nearest half gallon
*January 19, 2012*

**physics help**

well i square rooted 164.17 and gave me 12.8128 then i put - 12.8 and it gave me a wrong anwser for my hw problem
*January 19, 2012*

**physics help**

i didnt put 7.60m and 3.90m/s in the question problem
*January 19, 2012*

**physics help**

for A is it 164.17 b. would be a upward direction
*January 19, 2012*

**physics help**

A helicopter 7.60 above the ground and descending at 3.90 drops a package from rest (relative to the helicopter). We have chosen the positive positive direction to be upward. The package falls freely. A)Just as it hits the ground, find the velocity of the package relative to ...
*January 19, 2012*

**Math**

x-5 MOST research shows x-5 though i think it is a sentence......not sure about answer so if you think its wrong it probably is wrong
*January 17, 2012*

**Math**

Simplify 2x(x+3) Is it suppose to be 2x^2+6 or 2x^2+6x?
*January 17, 2012*

**arithmetic**

find the cost of 100grams of rice per 1/2 a kilogram
*January 16, 2012*

**geometry**

The graphs y=2x+1 and 2y+x=2 contain 2 sides of a rectangle.if 1 vertex of the rectangle has coordinates (6,3), draw the rectangle.
*January 11, 2012*

**statistics**

Mean class scored 74 w/ standard deviation of 4.3. What is range of scores for 68% of class?
*January 10, 2012*

**trigonometry**

okay i understand what u r saying...i think LOL we have a right triangle A= right verticle B= bottom horizontal (called the base when i was in school.thousand years back.) and C= adjascent line copleting triangle. A is on left, so we are on the same pagefrom the bottom of A ...
*January 7, 2012*

**trigonometry**

plz, forgive me, it has bee a while since i have worked with angle and terminology. i meant having a right angle triangle (the bottom or lowest horizontal line being the BASE line , the 90 degree line being the right angle. say the horizontal line is .5 inches the right angle ...
*January 7, 2012*

**trigonometry**

what is th decimal equiavalent of three degrees of a 90 degree angle with a .1666 long base
*January 7, 2012*

**physics**

An oxygen molecule consists of two oxygen atoms whose total mass is 5.3 x 10-26 kg and whose moment of inertia about an axis perpendicular to the line joining the two atoms, midway between them, is 1.82 × 10-46 kg·m2. From these data, estimate the effective ...
*January 2, 2012*

**physics**

A wheel of diameter 28.0 cm is constrained to rotate in the xy plane, about the z axis, which passes through its center. A force = (-38.0 + 39.0 ) N acts at a point on the edge of the wheel that lies exactly on the x axis at a particular instant. What is the torque about the ...
*January 2, 2012*

**Math grade 12**

10b-b+1
*January 1, 2012*

**math**

72 tires are changed between a small and large truck over 8 weeks. The large truck has 3 times as many tires as the small truck. How many tires does the small truck have?
*December 21, 2011*

**Pre-Cal**

find the value of the function k(p/q)
*December 16, 2011*

**Electric Power Tools**

I need help with my test, I don't know if they are all right or not. I answered the questions to the best of my ability. My answers are marked with an *. 1. What is the typical no-load speed of a high-speed drill? A. 1,000 rpm *B. 2,500 rpm C. 3,000 rpm D. 3,500 rpm 2. Why...
*December 15, 2011*

**English**

Do I need a comma in this sentence or can it be improved on? This dream signifies Gabriel’s hope for Roy to follow in his footsteps and become a religious figure like him.
*December 15, 2011*

**statistics**

If 20% of the people in a community use the emergency room at a hospital in one year, find the probabilities for a sample of 10 people, a.At the most three use the emergency room. b.Exactly three use the emergency room c.At least five use the emergency room.
*December 13, 2011*

**english**

Should i use the word by, of, as..in this sentence? John doesn’t know who or what to believe, for he has never experienced the cruelties by white people, like his father had.
*December 13, 2011*

**english**

Is this properly written? Ichiro Yamada, a no-no boy, struggles with an identity crisis as he returns home to Seattle after World War II.
*December 12, 2011*

**literature**

Full Powers
*December 12, 2011*

**literature**

"The poem of the Full Powers by Pablo Neruda" I need to know what is the poem about? I already read this poem but i dont really understand it :(
*December 12, 2011*

**literature**

I need to now what is the poem of full powers about... the poem is by pablo neruda translated by Ben Belitt and Alastair Reid I already read this poem but i dont really understand it. So please help me ASAP Thanks
*December 12, 2011*

**english**

K do I need a comma after times then? and if not could the sentence be improved?
*December 12, 2011*

**english**

Does the word times need an apostrophe after the e? Often time’s harmful words were accompanied by acts of violence towards Jews as well.
*December 12, 2011*

**english**

yep it focuses on race, social economic statuses and what not. thank you
*December 12, 2011*

**english**

Sorry ms.sue was helping me before, I mean is the sentence grammatically correct and basically does it sound good?
*December 12, 2011*

**english**

Hi again :) how does this sentence look? Through his accounts, he describes how the economic status of Jewish immigrants suffered greatly due to their race.
*December 12, 2011*

**english**

k thank you, sorry this is part of my final and my teacher says the grammar has to be perfect otherwise he will take a lot of points off.
*December 12, 2011*

**english **

Do I need a comma after poverty? If not does the sentence sound good? The author does a wonderful job of realistically bringing to life images of poverty, as well as describing what life was like growing up in the East side.
*December 12, 2011*

**english**

Please fix this sentence if there's something wrong with it. Race and class-consciousness go hand in hand in this novel as it exposes the harsh reality of poverty for Jewish immigrants in the 1900’s.
*December 12, 2011*

**Power Tools**

Can someone help me, Please!
*December 9, 2011*

**Power Tools**

Hello, I'm not sure if my answers are correct. Can someone review my work to make sure its right. My answers are marked with an *. 1. What is the typical no-load speed of a high-speed drill? A. 1,000 rpm *B. 2,500 rpm C. 3,000 rpm D. 3,500 rpm 2. Why should you be ...
*December 9, 2011*

**Physics**

1.17 m/s
*December 8, 2011*

**help me please**

find the area of each triangle to the nearest tenth. in triangle YZX x=12cm z=16cm measure of angle Y= 130 degrees in trianglE XYZ z= 11in. x= 7in. y= 13in.
*December 8, 2011*

**math**

yeah im lost i have no idea what i did
*December 8, 2011*

**math**

john's high score on the asteroid game was 326,700. mike's high score was 418,200. rebecca just plated the game and her high score wa halfway between john's and mike's. what was rebecca's score.
*December 8, 2011*

**chemistry**

A solution of sodium hydroxide is 8.20M and has a density of 1.20g/mL. What is the mole fraction of sodium hydroxide in the solution?
*December 8, 2011*

**physics**

A particle, starting from point A in the drawing at a height h0 = 3.2 m, is projected down the curved runway. Upon leaving the runway at point B, the particle is traveling straight upward and reaches a height hf = 4.1 m above the floor before falling back down. Ignoring ...
*December 8, 2011*

**Algebra**

What is the correct significant figures of 14.2 • 8.5 Options: 121 120 100 120.7 also can you explain why the one you picked is correct? Thank you!
*December 6, 2011*

**math equation**

the y intercept is when x=0. so it is y=2. to graph it is easier to find also the x intercept (y=0) and then graph.
*December 3, 2011*

**physics**

A circular disk of mass 0.2 kg and radius 24 cm, initially not rotating, slips down a thin spindle onto a turntable (disk) of mass 1.7 kg and the same radius, rotating freely at 3.4 rad/s. Find the new angular velocity of the combination.
*December 3, 2011*

**math 4th grade**

writing a sequence for the rule a-4=b
*November 29, 2011*

**Mechanics**

At t = 0 s a flywheel is rotating at 30 rpm. A motor gives it a constant acceleration of 0.9 rad/s^2 until it reaches 70 rpm. The motor is then disconnected. How many revolutions are completed at t = 20 s?
*November 28, 2011*

**physics help please**

an air puck of mass m1= 0.25 kg is tied to a string and allowed to revolve in a circle of radius R=1.0m on a frictionless horizontal table . the other end of the string passes through a hole in the center of a table and a mass of m2=1.0kg is tied to it. the suspended mass ...
*November 27, 2011*

**Math**

Because of the Earth’s curvature, a person can see a limited distance to the horizon. The higher the location of the person, the farther the person can see. The distance D in miles to the horizon can be estimated by D(h)=1.22√h, where h is the height of the person ...
*November 25, 2011*

**Math**

I am sorry you feel that way we are all working together in the same class. Thanks anyway.
*November 25, 2011*

**Math**

Find the variation constant in which y varies inversely as x, and the following condition exists. Y=30 when x=1/6 K=
*November 25, 2011*

**Math**

The electrical resistance of a wire is directly proportional to its length. If a 3-foot long wire has a resistance of 1 ohm(s), find the resistance of a 9-foot long wire. What is the resistance?
*November 25, 2011*

**business**

Identify a sacco organization involved in online business
*November 22, 2011*

**Algebra II**

The maximum safe load of a rectangle beam varies jointly as its width and the square of its depth and inversely as the length of the beam. If a beam 8.00 in. wide, 11.5 in. Deep, and 16.0 ft long can safely support 15.000 lb, find the safe load for a beam 6.50 in. Wide, 13.4 ...
*November 21, 2011*

**Algebra II**

The kinetic energy of a moving body is directly proportional to its mass and the square of its speed. If the mass of a bullet is halved, by what factor must its speed be increased to have the same kinetic energy as before?
*November 21, 2011*

**Algebra II**

If y varies jointly as w and x, and y is 483 when x is 742 and w is 383, find y when x is 274 and w is 756.
*November 21, 2011*

**math**

according to a recent survey 38% of americans get six hours or less of sleep each night. if 75 people are selected to participate in a sleep survey, find the probability that 30 or more of them get six hours of sleep each night
*November 20, 2011*

**physics emergerncyy!**

A particle of mass m1 = 2.5 kg moving along the x axis collides with a particle of mass m2 = 4.7 kg initially at rest. The incoming particle is deflected in the direction 24 degrees above the x axis, whereas the target particle moves off at 14 m/s at 39 degrees below the x ...
*November 19, 2011*

**chemistry**

what is a double replacement precipitation reaction and limiting reactants
*November 17, 2011*

**emergency physics**

A 15 g bullet strikes and embeds in a 2.8 kg block suspended at the end of a 1 m string. After the collision the string rises to a maximum angle of 20 degrees to the vertical. what is the speed of bullet?
*November 16, 2011*

**science**

how many atoms are in a mole?
*November 16, 2011*

**math**

how would you write this word problem as an equation? When the gas gauge on her car was on the 3/8 mark, Karen pumped 15 gal. of gas into the tank in order to fill it. How many gal. of gas does the tank in Karen's car hold?
*November 16, 2011*

**physics emegency!**

so the 7.5 is irrelevant ?
*November 14, 2011*

**physics emegency!**

A 16 kg object with a velocity 7.5 m/s explodes into two equal fragments. One flies off with a velocity 2.5i -2.5j m/s. What is the velocity of the other fragment in vector notation?
*November 14, 2011*

**Calculus**

Let f(x)=3x^5+5x^3+15x+15. Use Rolle's Theorem to show that f(x) has exactly one root.
*November 13, 2011*

**physics**

A 1.5-kg cart is pulled with a force of 7.3 N at an angle of 40° above the horizontal. If a kinetic friction force of 3.2 N acts against the motion, the cart’s acceleration along the horizontal surface will be
*November 12, 2011*

**Chemistry**

the half-life of cobalt-60 is 5.20 years.. how many milligrams of a 2.000-mg sample remains after 6.55 years?
*November 11, 2011*

**statistics**

A shipping company received an order of 1645 packages. The manager needs to determin the mean weight of the packages. (A) How many randomly selected packages would be need to weight to estimate with a 95% confidence, the mean weight within +/-1.5 pounds if prior studies ...
*November 11, 2011*

**Statistics**

Ticket sales for opening night of a movie have a mean of $2100 with a standard deviation of $450. Assume these ticket sales follow a normal distribution. If a movie is selected randomly, what is the probability that opening night ticket sales are more than $1620?
*November 9, 2011*

**algebra3**

Why isn't the absolute value inequality (x^2-1)</=8 set up as -8<x^2-1<8 yielding -7<x^2<9 so +/-sqrt-7<x<+/-sqrt9 so +/-isqrt7<x<+/-3?
*November 8, 2011*

**Math **

Find the mystery number. Three less than the quotient of the number and five is negative fifty-two.
*November 8, 2011*

**Statistics**

In a population of 240 women,the heights of the women are normally distributed with a mean of 64.2 inches and a standard deviation of 3.2 inches. If 36 women are selected at random, find the mean mu x and stand deviation sigma x of the population of sample means. Assume that ...
*November 8, 2011*

**physics**

A child lifts a 5.0-newton toy to a height of 0.50 meters. How much work is done on the toy?
*November 8, 2011*

**Algebra 3**

Isn't the problem set up as -8<x^2-1<8 so -7<x^2<9 so +/-sqrt-7<x<+/-sqrt9 because it is an absolute problem? /
*November 8, 2011*

**Algebra 3**

Absolute Value (x^2-1)<8, I keep coming up with +/- isqrt7< x < +/- 3 but its wrong.
*November 8, 2011*

**Physics**

Two identical boats travel through still water at 3 m/s. They start from the same point, one travels parallel (and antiparallel) to the current and the other travels perpinducular. It takes one boat twice as long as the other. How fast is the current in the river flowing.
*November 7, 2011*

**PHYSICS HELP**

m1 = 2.7 kg block slides on a frictionless horizontal surface and is connected on one side to a spring (k = 40 N/m) as shown in the figure above. The other side is connected to the block m2 = 3.6 kg that hangs vertically. The system starts from rest with the spring unextended...
*November 6, 2011*

**PHYSICS HELP**

m1 = 2.7 kg block slides on a frictionless horizontal surface and is connected on one side to a spring (k = 40 N/m) as shown in the figure above. The other side is connected to the block m2 = 3.6 kg that hangs vertically. The system starts from rest with the spring unextended...
*November 6, 2011*

**physics**

when a 2.50 kg object is hung vertically on a certain light spring described by hookes law the spring stretches 2.76 cm. A) what is the force constant of the spring. B) if the 2.50 kg object is removed how far will the spring strecth if a 1.25 kg block is hung on it. C) how ...
*November 6, 2011*

**Algebra 3**

Trying to solve this rational inequality but can't figure how to factor the numerator. ((3x-2x^2)/(4-x^2))<((3+x)/(2-x))
*November 6, 2011*

**MGT 437**

Which one of the following is not a project risk? a)Political Risk b) Department Risk c) Technical Risk d) Schedule Risk e) Production Risk
*November 5, 2011*

**PHYSICS**

m1 = 2.7 kg block slides on a frictionless horizontal surface and is connected on one side to a spring (k = 40 N/m) as shown in the figure above. The other side is connected to the block m2 = 3.6 kg that hangs vertically. The system starts from rest with the spring unextended...
*November 3, 2011*

**Math**

Steve bought 300 shares stock for x dollars per share in 2008. This year he sold the stock for y dollars per share where y<x.He lost on the transaction. is wife Lisa used the formula (y-x)/x to compare the percent of loss. Steve said Lisa was incorrect because she didn'...
*November 3, 2011*

**math**

a phone company wants to create some new area codes. each area code will be 3 numbers . using the digits 1,5,and 7 only once in each code, how many codes can the phone company create?
*November 3, 2011*

**Chem**

In a coffee cup calorimeter, 50.0 mL of 0.100 M AgNO3 and 50.0 mL of 0.100 M HCl are mixed to yield the following reaction: Ag+ (aq) + Cl- (aq) -----------------> AgCl (s) The two solutions were initially at 22.60 °C, and the final temperature is 23.40 °C. Calculate...
*November 2, 2011*

**physicss help!**

m1 = 2.7 kg block slides on a frictionless horizontal surface and is connected on one side to a spring (k = 40 N/m) as shown in the figure above. The other side is connected to the block m2 = 3.6 kg that hangs vertically. The system starts from rest with the spring unextended...
*November 2, 2011*

**physics**

m1 = 2.7 kg block slides on a frictionless horizontal surface and is connected on one side to a spring (k = 40 N/m) as shown in the figure above. The other side is connected to the block m2 = 3.6 kg that hangs vertically. The system starts from rest with the spring unextended...
*November 2, 2011*

**probability**

carlos shoots a free throw in basketball, what are the chances of making a basket?
*October 31, 2011*

**Math**

a=35 s=50
*October 30, 2011*

**help! physics**

it doesnt work can u help me?
*October 29, 2011*

**help! physics**

A 1.7 kg block is moved at constant speed over a surface for which the coefficient of kinetic friction is 0.27. The displacement is 2 m. It is pushed by a force directed at 25 degrees below the horizontal. Find the work done on the block by: the force. How do you find the ...
*October 29, 2011*

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