Thursday

October 2, 2014

October 2, 2014

Total # Posts: 2,416

**Chemistry**

Calculate the enthalpy change of formation for the following reactions using Hess's law, and the enthalpies of formation given in Figure 4: b) MgO +2HCl --> MgCl2 +H2O c)NaOH+ HCl -->NaCl +H20 Figure4: the given enthalpies of formation compound values are: Mg(OH)2 is...
*January 30, 2014*

**Physics**

UCSC?
*January 29, 2014*

**Physics**

For a rotating object the equation for acceleration is a = v^2 / r. The force is F = m*a = m*v^2 / r. The force in this problem is the coulomb force. F = k*3q*q / r^2 = m*v^2 / r Since the kinetic energy is just m*v^2 / 2, and that's all we need, let's multiply both ...
*January 27, 2014*

**Chemistry**

Water is composed of 11.2% hydrogen and 88.8% oxygen. what mass of water contains 50.0g of 0xygen?
*January 27, 2014*

**Physics**

What is the frequency of a blue light with a wavelength of 489 nm
*January 26, 2014*

**chemistry**

An unknown substance has a mass of 28.1 g. The temperature of the substance increases by 16.3 degrees Celsius when 176 J of heat is added to the substance. What is the most likely identity of the substance? The table lists the specific heat capacities of select substances.
*January 26, 2014*

**algebra 1**

A gardner is calculating the perimeter of a rectangular garden, which has a length of 25 feet. The area of the garden is 400 square feet. What is the perimeter of the garden? Write the equation: could it be this? p=400/25+400/25+25+25
*January 22, 2014*

**Algebra 1**

ok thanks
*January 22, 2014*

**Algebra 1**

A jacket costs $45. It is on sale for 20% off. What is the price of the new jacket? Write the equation.
*January 22, 2014*

**Physics**

A spring with a force constant of 5.4 N/m has a relaxed length of 2.63 m. When a mass is attached to the end of the spring and allowed to come to rest, the vertical length of the spring is 3.64 m. Calculate the elastic potential energy stored in the spring. Answer in units of ...
*January 22, 2014*

**Algebra 1**

Two students are absent. This is 1/8 of the entire class. How many students are in the entire class? Write the equation: How would you write an equation?
*January 22, 2014*

**Algebra 1**

thanks
*January 22, 2014*

**Algebra 1**

Two students are absent. This is 1/8 of the entire class. How many students are in the entire class? Write the equation: How would you write an equation?
*January 22, 2014*

**Eng 2**

Which phrase best describes this type of sentence? Sandy creates her best pieces of art late in the day. A) prepositional phrase modifying an adverb B) adverb modifying other adverbs C) prepositional phrase modifying other prepositional phrases D) preposition with compound ...
*January 21, 2014*

**Math**

I HAD THIS QUESTION TOO. ITS 13mm
*January 21, 2014*

**MATH**

Find the exact values. (a) tan(π/3) = ? (b) sin(7π/6) = ? (c) sec(5π/3)= ?
*January 19, 2014*

**Math**

Rewrite by completing the square x2 + x + 1
*January 17, 2014*

**Math**

Given the line 4x - 3y = 12, what is the distance between it and the origin I know the answer is 2.4 but how do u do it
*January 16, 2014*

**5th grade math**

A.. Because then number after 1 have to multiply the previous number (1) so 1*1=1. Then it subtracts the previous number 1-1=0. So the list would be 1,0,0,0,0 so on... So A is incorrect
*January 15, 2014*

**Math**

Which method did u use? I don't know if there is a faster way of doing it then what I'm doing
*January 15, 2014*

**Math**

Given the line 4x - 3y = 12, what is the distance between it and the origin Is it 2.4?
*January 15, 2014*

**science**

IS PLUTO A PLANET...
*January 15, 2014*

**math crctprep**

The Jones family drove a total of 3584 miles in 9 days. They drove the same number of miles each day. Which of the following is closest to the number of miles they drove each day?
*January 15, 2014*

**Math**

Someone help please
*January 10, 2014*

**Math**

if a b and c are constants and (x+2)(x+b)= x^2+cx+6, what is c
*January 10, 2014*

**Language Arts **

Can you define this in simpler terms: Determine the meaning of words and phrases as they are used in the text, including figurative and connotative meanings; the cumulative impact of specific word choices on meaning and tone. How might this be important in school, work, or ...
*January 10, 2014*

**Math**

if x,y and y-(1/x) are not 0, then (x-(1/y))/(y/(1-x))=?
*January 3, 2014*

**Math**

If n! =1×2×2×...×(n-1)×n,find value of (3!)!/3!
*January 3, 2014*

**Math**

What is the value of 1000^2/(252^2/248^2) How do you do it faster
*January 3, 2014*

**Math**

If x≠0, x/2=y^2 and x/4=4y, then what is the x
*January 3, 2014*

**Math**

1. For all non-zero numbers x and y such that x= 1/y, what is the value of ( x- 1/x)(y+ 1/y)
*January 3, 2014*

**Math**

The ratio of w to x is 4:3, of y to z is 3:2 and of z to x is 1:6. What is the ratio of w to y?
*January 1, 2014*

**Math**

If x : y = 3 : 4 and x : (y + z) = 2 : 5, what is the ratio of x : z?
*January 1, 2014*

**Math**

if company 2 lease/maintenance totals $125,000 for the year and company 1 spends 27% for lease/maintenance, how much is company 1 paying for their lease/maintenance?
*January 1, 2014*

**MMath**

21.45
*January 1, 2014*

**MMath**

Three servers work a party of 30 guests with a meal total of $660.00. Restaurant policy adds a 15% gratuity to the bill for parties of 8 or more. If bartenders receive 15% of the gratuity, bussers receive 20%, and the rest goes to the servers, how much does each server get?
*January 1, 2014*

**statistics **

Solve the problem. Round to the nearest tenth unless indicated otherwise. The amount of rainfall in January in a certain city is normally distributed with a mean of 4.3 inches and a standard deviation of 0.3 inches. Find the value of the quartile .
*December 18, 2013*

**Math help ms sue.**

Dude. This website is meant for a teacher to help you review your homework. Ms. Sue is not obligated to do your homework for you.
*December 16, 2013*

**Simplifying trig expression**

sin(x+90) = ? cos(x+90) = ? Would the first equal like -sin(x)? Would the second equal uh -cos(x)? I'm not quite sure :/
*December 16, 2013*

**LCM of two numbers?**

the lcm of pi/2 and pi/3 is 6?
*December 15, 2013*

**LCM of two numbers?**

lcm of two numbers pi/3 pi/2 How do I do it? Would it be pi or pi/6? Thanks
*December 15, 2013*

**science **

the honeyguide bird leading the honey badger to the bees hive, both eat meat what is the symbiosis for this
*December 12, 2013*

**Chemistry**

How many grams of K2Cr2O7 (Potassium dichromate) must be used to make 250 ml of a0.125 M solution?
*December 8, 2013*

**business law**

*The below is a scenario in which I have to make an IRAC for (not sure if you know what that is) but read the scenario and see if "Faye" is able to leave legally without ramifications. You must also list the legal rules that apply to this scenario..(for example, if ...
*December 2, 2013*

**physics**

A certain elevator car has mass 2200 kg and is lifted by cables driven by an electric motor. The efficiency of the lift system (motor, pulleys, cable, etc.) is 67.0%. As the elevator car moves at constant speed of 3.0 m/s it encounters 220N of friction coming from its tracks. ...
*December 1, 2013*

**physics**

A steel section of the Alaskan pipeline had a length of 65.1 m and a temperature of 15.8 °C when it was installed. What is its change in length when the temperature drops to a frigid -31.2 °C?
*November 30, 2013*

**poetry**

Could you help me answer these questions using William Cullen Bryant's poem, "The Prairies?" Thank you so much! I've attached a link to the poem. The poem text is widely available online if you just google the title/author Here are the questions I am ...
*November 27, 2013*

**math**

what would be an example of a parameter? i'm confused. i'm given this problem: How much time do undergraduate students at GMU spend each day reading and sending email? A survey was conducted by a graduate student asking students in the Johnson Center the above question...
*November 24, 2013*

**math**

ITS 40 TONNES
*November 22, 2013*

**Physics HELP!!**

A gyroscope consists of a uniform disc of mass radius M= 1 kg and radius R= 0.3 m . The disc spins with an angular speed ω= 200 rad⋅s-1 as shown in the figure below. The gyroscope precesses, with its axle at an angle 30∘ below the horizontal (see figure). The ...
*November 20, 2013*

**Physics**

A woman on a bridge 75.0m high sees a raft floating at a constant speed on the river below. She drops a stone from rest in an attempt to hit the raft. The stone is released when the raft has 7.00m more to travel before passing under the bridge. The stone hits the water 4.00m ...
*November 19, 2013*

**Algebra**

poop
*November 17, 2013*

**math**

Sheila is going to divide a 36-inch piece of ribbon into 5 equal pieces.She says each piece will be 7 inches long.whats the error?
*November 12, 2013*

**Physics**

A coin rests 18.0 cm from the center of a turntable. The coefficient of static friction between the coin and turntable surface is 0.390. The turntable starts from rest at t = 0 and rotates with a constant angular acceleration of 0.850 rad/s2. (b) At what angular speed (ω...
*November 12, 2013*

**Physics**

A ball is thrown horizontally from the top of a building 45.2 m high. The ball strikes the ground at a point 78.9 m from the base of the building. The acceleration of gravity is 9.8 m/s 2 . Find the time the ball is in motion, initial velocity, and x and y components
*November 10, 2013*

**Physics**

Tom the cat is chasing Jerry the mouse across a table surface 2.4 m oﬀ the ﬂoor. Jerry steps out of the way at the last second, and Tom slides oﬀ the edge of the table at a speed of 4.8 m/s. Where will Tom strike the ﬂoor? The acceleration of ...
*November 10, 2013*

**science**

inertia
*November 10, 2013*

**C++**

True or false: A function call statement transfers control of the program to the last statement in the body of a function.
*November 8, 2013*

**physics**

Net force F causes mass m1 to accelerate at rate a. A net force of 3F causes mass m2 to accelerate at rate 2a. What is the ratio of mass m1 to mass m2?
*November 5, 2013*

**music history**

I need an example thesis for a research paper. It can be about pretty much any music as long as its before 1750. (pretty much everything from Ancient Music - The Baroque period). Thanks in advance!
*November 4, 2013*

**algebra**

How do i solve an equation when there is a variable on both side of = and the two constants are equal x-16 = 16-2x 7-2x = 2x-7 The answer in both cases seems to = 0
*October 30, 2013*

**science**

A hockey puck sliding on a frozen lake comes to rest after traveling 272 m. If its initial velocity is 3 m/s, what is its acceleration (assumed constant)? Answer in units of m/s2
*October 29, 2013*

**MATH _ RE-POST PLEASE HELP**

I dont' know
*October 27, 2013*

**Computer Programming using python**

def test(): index = 1 prev_index = 0 count = 0 global largest largest = '' test = s[prev_index] while count < len(s): if ord(s[index]) > ord(s[prev_index]): test += s[index] index += 1 prev_index += 1 elif ord(s[index]) == ord(s[prev_index]): test += s[index] ...
*October 24, 2013*

**Chemistry**

When 1.00 kg lead (specific heat = 0.13 J g -1 C -) at 100.0 C is added to a quantity of water at 28.5C, the final temperature of the lead-water mixture is 35.2 C. What is the mass of water present?
*October 21, 2013*

**Chemistry**

How much heat, in kilojoules (kJ), is required to raise the temperature of 2.50kg Hg(l) from -20.0 to -6.0C? Assume a density of 13.6g/ml and a molar heat capacity of 28.0 J mol -1 C -1 for Hg(l). Please helpppppp .... thanks in advance
*October 21, 2013*

**MATH MS.SUE HELP PLEASE!**

idk how to tag so maybe this might tag Ms. Sue here.
*October 18, 2013*

**MATH MS.SUE HELP PLEASE!**

Could somebody help me I don't understand any of this. Could someone show me or tell me how to work the problems? 1. Find the length of the hypotenuse of a right triangle with the legs of 9cm and 12cm A.8 B.21 C.15 D.225 2.The length of a hypotenuse of a right triangle is ...
*October 18, 2013*

**Math**

Oh, and 10/9 is the same thing as 1 1/9, so you were right.
*October 13, 2013*

**Math**

3^0+3^(-2) = 1 + 1/9 = 9/9 + 1/9 = 10/9 = 1.1111111...
*October 13, 2013*

**science**

what is a catalyst converter
*October 13, 2013*

**Algebra**

Never mind, I got it.
*October 13, 2013*

**Algebra**

Is the Riemann Hypothesis correct? Why or why not? Please show your work.
*October 13, 2013*

**Math**

Find the length of the arc (sector question) Radius=8cm Angle=27
*October 7, 2013*

**math**

Determine the vertex and the axis of symmetry for the function below: y=-4x^2-24x-36
*October 7, 2013*

**math**

A quadrant has an area of 175m2. Find the length of its base
*October 6, 2013*

**Physics**

A rocket moves upward, starting from rest with an acceleration of 28.1 m/s2 for 5.21 s. It runs out of fuel at the end of the 5.21 s, but does not stop. How high does it rise above the ground?
*October 5, 2013*

**Math**

I checked the question again but that is all it wrote
*October 5, 2013*

**Math**

In one revolution a wheel moves forward a distance equal to its circumference. This is because the wheel Always in contact with the floor. 1)A trundle wheel clicks everytime. What is the radius of the wheel
*October 5, 2013*

**Math**

The diameter of a bicycle wheel is 65 cm How many revolutions are needed to make the bike travel 2km
*October 5, 2013*

**Math**

Then would the answer be 43.98???
*October 5, 2013*

**Math**

A running track has 8 lanes each a meter wide.Each"straight" is 100 meters long. The distance around the track for someone running in the middle of the inside lane is 400 meters. What is the distance around the track for someone running in the middle of the outside ...
*October 5, 2013*

**business**

The type of accounting concerned with providing information and analyses to managers within the organization is referred to as
*October 3, 2013*

**adv algebra hw**

Let x,y,z be positive real numbers such that: xyz=945 x(y+1)+y(z+1)+z(x+1)=385. What is the minimum possible value of z+y/2+x/4?
*October 1, 2013*

**Astronomy**

This is part of Coursera class final exam (From the Big Bang to Dark Energy by Hitoshi Murayama). I think it's OK to learn about the Higgs via lectures or web searches. But asking for folk to answer the question is cheating.
*October 1, 2013*

**science **

What is a possible hypothesis that could be tested in the Atomic Theory lab?
*September 30, 2013*

**delftx**

For Question 1: 2440 Total PV output = 1000W/m2×18%×10m2=1800W PV module costs = 1800W×€0.8/Wp=€1440. Non-modular costs = €100/m2×10m2=€1000. Total cost = PV module costs + non-modular costs = €2440.
*September 29, 2013*

**chem**

How many grams of NH3 are required to make 52.7g H2O in the following reaction : 4NH3+6NO->5N2+6H2O
*September 28, 2013*

**chem**

Correction!! in the question its **12CO2**
*September 28, 2013*

**chem**

Help a brother out!!! please!!!Nitroglycerin, C3H5N3O9 decomposes to form N2,CO2,H2O, and O2 4(C3H5N3O9)-> 6N2+12O2+10H20+O2 a)How many grams of water would be produced if 75g of nitroglycerin decompose? b)The creation of 3.89 moles of C02 would require how many grams of ...
*September 28, 2013*

**us history**

Compare and contrast the goasl and strategies of the Reconstruction of TWO of the following -President -Lincon -Johnson -Congressional Republicans
*September 26, 2013*

**us history**

Describe the long-term political and economic effects of the Reconstruction and southern reaction on African Americans
*September 26, 2013*

**us history**

Explain whether slavery or representation was the main cause of disunion. You may incorporate two of the following to support your answer -The Missouri Compromise -The Free-Soil Movement -Compromise of 1850 -Kansas-Nebraska Act, 1854 -Bleeding Kansas Dred Scott v. Sandford
*September 26, 2013*

**us history**

Analyze the ways that the Free-Soil movement influenced U.S politics from 1820-1860. Explain the significance of this movement.
*September 26, 2013*

**physics**

if you are stuck in the middle of a frictionless frozen lake with only your backpack, how can you get back safely to solid ground?
*September 25, 2013*

**physics**

if you are stuck in the middle of a frictionless frozen lake with only your backpack, how can you get back safely to solid ground?
*September 25, 2013*

**physics**

if you are stuck in the middle of a frictionless frozen lake with only your backpack, how can you get back safely to solid ground?
*September 25, 2013*

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