Monday

November 30, 2015
Total # Posts: 1,489

**Chemistry**

dH1 i got -890 kJ/mol dH2 i got -1411 kJ/mol
*October 27, 2014*

**Chemistry**

I tried to use how you answered for someone else but I got it wrong and used all my tries so I would like the real answer to see where I went wrong! Thanks for your consideration!
*October 27, 2014*

**Chemistry**

A 10.0 gram sample of a mixture of CH4 and C2H4 reacts with oxygen at 25°C and 1 atm to product carbon dioxide gas and liquid water. If the reaction produces 520 kJ of heat, what is the mass percentage of CH4 in the mixture? I am all out of tries on the homework, but I ...
*October 27, 2014*

**Pre-calc**

If Theta= -7pi/6; then cos(Theta) is...
*October 25, 2014*

**CHEMISTRY!!!!! HELP!!**

high school level
*October 18, 2014*

**CHEMISTRY!!!!! HELP!!**

I'm looking for a chemistry and applied chemistry textbook that had been published between 2011-2014. Please help because I couldn't find one on google.
*October 18, 2014*

**CALCULUS**

Hi guys can you help me! Please teach me step by step.. I really need it. pls! Thank you......... A swimming pool is 12 meters long, 6 meters wide, 1 meter deep at the shallow end, and 3 meters deep at the deep end. Water is being pumped into the pool at ¼ cubic meter ...
*October 17, 2014*

**Math**

Which group names all the whole number factors of a composite number? A. 1, 2, 3, 6, 9, 36 B. 1, 3, 5, 9, 45 C. 1, 3 D. 1, 2, 3, 4, 6, 8, 12, 24
*October 16, 2014*

**history**

1.c 2. d 3. d 4. a 100
*October 16, 2014*

**physics**

5. A woman is wearing her seat belt while driving 95km/h. She finds it necessary to slam on her brakes, and she slows uniformly to a stop in 5 s. Calculate the average force exerted on her by the seat belt (neglecting friction with the seat)? Express the result as a multiple ...
*October 16, 2014*

**physics**

An arrow is aimed horizontally, directly at a target 20.6 meters away. when the arrow is released, it lands 0.095 meters below the target point. a) How long was the arrow in the air? b) How fast was the arrow moving when it left the bow?
*October 3, 2014*

**physics**

You and your friend are on the roof of a 20 m tall building investigating a free fall. Your friend releases a small rock from rest. You throw another rock simultaneously with your friend aiming it straight down. (a) What initial speed should you supply to the rock so it hits ...
*September 28, 2014*

**English**

I need to create a diagram of hell similar to Dantes Inferno. What punishments would teach the following sins a lesson: Liars Thieves Cheaters Abusers Kidnappers Traitors Murderers Fraudsters Assualters
*September 28, 2014*

**physics**

A pot with a flower falls out of a window box in a tall apartment building. It passes the top of a particular window with a velocity of -1.7 m/s. It passes the bottom of this window 0.2800 s later? How tall is the window (watch sign)?
*September 27, 2014*

**Chemistry **

Please help! Calculate the standard change in enthalpy, ΔH°rxn, for the decomposition of calcium carbonate to calcium oxide CaCO3 (s) → CaO (s) + CO2 (g) Given that: ΔH°f CaCO3 (s) = -1206.9 kJ/mol ΔH°f CaO (s) = -635.1 kJ/mol ΔH°f CO2...
*September 27, 2014*

**physics**

A ball falls 5.00 m to the ground. It remains in contact with the ground for 0.027 s and then rebounds to a maximum height of 1.61 m. What acceleration did the ball experience while it was in contact with the ground?
*September 27, 2014*

**physics**

A hot-air balloon is rising upward with a constant speed of 2.35 m/s. When the balloon is 2.50 m above the ground, the balloonist accidentally drops a compass over the side of the balloon. How much time elapses before the compass hits the ground?
*September 24, 2014*

**Physics**

An object is launched at an angle of 24 degrees above the horizontal at a velocity of 33.7 m/s from the top of a building which is 110.8 meters above the ground. When the object lands on the ground, what is the horizontal displacement from the base of the building in meters? ...
*September 24, 2014*

**chem**

A .7567 impure KHP was dissolved in water. 26.7 ml of standardized 0.068 M NaOH was used to achieve a phenolphthalein end point. The stoichiometric ratio between KHP and NaOH is 1:1. What is the percent by mass of KHP in the sample?
*September 23, 2014*

**Math**

cos 60 = 1/2 sin 60
*September 23, 2014*

**chem**

a 50ml aliquot sample of vinegar is titrated with a 0.078 M NaOH sol'n. The phenolpthalein end point was reached after the addition of 35.6 ml. Equation: HC2H3O2 + NaOH _____> NaC2H3O2 + H20 Calculate the % by mass/vol. of acetic acid in the sample.
*September 23, 2014*

**sociology**

in order to establish society, humans agree to obey certain rules.
*September 23, 2014*

**physics**

To what temperature must you raise a copper wire, originally at 20.0°C, to double its resistance, neglecting any changes in dimensions? (Does this happen in household wiring under ordinary circumstances?)
*September 13, 2014*

**physics**

The resistivity of silver is 1.59 × 10-8 Ω·m. What is the resistance of a section of 12 gauge wire (diameter 0.2057 cm) that is 8.60 m long?
*September 13, 2014*

**BASIC ACCOUNTING**

paid two months rent deposit and one month advance, P40,500
*August 23, 2014*

**Maths Help!!**

Melisa used 0.6kg of red sand to make a mural on the wall. She added 250g of blue sand to it. Finally she added 500g of white sand to half of the mixture. Find the mass of the mixture that has white sand in it. Express your answer in kilogram
*August 15, 2014*

**Maths **

In a basket, 3/4 of the fruits are oranges and the rest are apples. After I have away 10 oranges, there are now 1/2 as many oranges as apples. How many apples and oranges are there in the basket?
*August 14, 2014*

**Maths - Optimisation**

Thank you so much for your help on this :) Just a question though.. After you say y = 2x, you sub in y as 4x? ie. =(x^2+4x^2)^(1/2) where did the '4x' come from?
*August 8, 2014*

**Maths - Optimisation**

I've been trying to work out this question for hours and I can't seem to figure it out. Question: "Point 'A' is situated in the bottom left hand corner of a vertical rectangle with the dimensions 6m x 3m. Point 'B' is situated in the opposite top ...
*August 8, 2014*

**Chemistry**

Calculate PH of 0.05 M solution of ammonium acetate
*July 31, 2014*

**Math**

got it. thank you so much!
*July 30, 2014*

**Math**

how did you get appr 171.9° in the first question?
*July 30, 2014*

**Math**

Not really, can you go through it with me?
*July 30, 2014*

**Math **

If A=<2,1> and B=<-1,1>, find the magnitude and direction angle for -2A +3B Find all specified roots: Cube roots of 8i A parallelogram has sides of length 32.7cm and 20.2cm. If the longer diagonal has a length of 35.1cm, what is the angle opposite this diagonal?
*July 30, 2014*

**Math**

how can i put that in the form of A cos B (t- C)+D and A sin B (t- C)+D?
*July 30, 2014*

**EPIDEMIOLOGY**

A case-control study of the relationship between liver cirrhosis and alcohol use. In this study, smoking is associated with drinking alcohol and is a risk factor for liver cirrhosis among both non-alcoholics and alcoholics. Explain whether smoking is a confounder.
*July 13, 2014*

**Science**

THIS ULCERS ARE CAUSED BY A BACTERIA INFECTION
*July 13, 2014*

**Physics**

I finally got #3!
*July 10, 2014*

**Physics**

Actually, I have 3 questions to solve. I know the 1st one requires Coulomb's constant, but I just can't get the formula to work. Ditto for the formulas for the other 2 questions. 1) A 6.3 μC point charge and a −1.7 μC point charge are separated by a ...
*July 10, 2014*

**Physics**

I don't understand what the "^2" means or how to use it in the equation.
*July 10, 2014*

**Physics**

I have the 1st two answers, I just don't know how to calculate the other two. Everything I have tried comes out with a wrong answer. (a) 479.04e+8 m/s2 (b) 7.30627923e-7 s (c) m (d) J
*July 10, 2014*

**Physics**

A proton with mass 1.67×10−27 kg and charge 1.60×10−19 C accelerates from rest in a uniform electric field of strength 500 N/C. (a) What is the magnitude of the acceleration of the proton? (b) How long does it take the proton to reach a speed of 35,000 ...
*July 10, 2014*

**Math**

The 8th term of a g.p is -7/32 fine it's common ration if its first term is 28
*July 6, 2014*

**Physics**

You and a friend are playing a game of squirt-gun tag in a maze. Suddenly you see your friend's image in a small planar mirror (see illustration). You take a shot over the barrier in front of you and find that your friend is just at the end of the 7.0 m range of your ...
*June 29, 2014*

**Algebra**

multiply (n^3+8)(n-4) can you give me an example on how to solve this please
*June 25, 2014*

**physics**

A motor boat whose speed is 2.6 m/s in still water, needs to point upstream at an angle of 28.5 in order to travel straight across the river. Calculate the speed of the current and the resultant velocity of the boat across the river.
*June 24, 2014*

**MATH**

what is answer of this problem set X={X/X IS A BOY}
*June 17, 2014*

**Algebra**

solve grafically 3x-y=8, 6x-2y=8
*June 16, 2014*

**Algebra**

solve the problem grafically, 4y=x+4, x=2/3y+8/3
*June 16, 2014*

**Physics**

Show that the x-component of the tension force Fc in terms of its magnitude Fc is given by -0.3420 Fc
*June 10, 2014*

**Physics**

The length of a box is reduced to two third of its original value and the width and height are tripled. Calculate the factor by which the volume has changed. Am I on the right track? If not please help I am stuck. Thanks. V=LWH V=(L-2/3)(3W)(3H)
*June 4, 2014*

**geometry**

A hemispherical dome holds a volume of 486π..find the surface area (omit the area of the circle)? I just need the formulas id use
*May 30, 2014*

**Cosine Law NEED HELP QUCIK**

The minute hand of a clock is 12 cm long, and the hour hand is 10cm long. Determine the distance between the tips of the hands at 9:30pm, to the nearest mm. The answer is 17.5 cm I need to work on how to get to that answer!
*May 27, 2014*

**Cosine Law NEED HELP QUCIK**

For the next three questions, choose which is the most appropriate method to solve the problem, explain your answer. a) SOACAHTOA b) The Sine Law c) The Cosine Law d) The problem cannot be solved without further information 1) Yachts in a race have to sail a triangular course...
*May 27, 2014*

**7th grade science**

Energy & Environment Which of the following desribes an example of land reclamation? A)after an are is mined for copper ,the soil is replaced and new plants are planted. B)after a forest is clear-cut ,desertifications occur. C)after a forest is clear-cut,it is mined for copper...
*May 27, 2014*

**Cosine Law**

For the next three questions, choose which is the most appropriate method to solve the problem, explain your answer. a) SOACAHTOA b) The Sine Law c) The Cosine Law d) The problem cannot be solved without further information 1) Yachts in a race have to sail a triangular course...
*May 25, 2014*

**Cosine Law**

The minute hand of a clock is 12 cm long, and the hour hand is 10cm long. Determine the distance between the tips of the hands at 9:30pm, to the nearest mm.
*May 25, 2014*

**Cosine Law**

Find all missing sides/angles. Round each answer to the nearest unit. Angles/sides ABC (left to right) 1) Angle c= 70 deg side b= 28 yd side c= 26 yd 2) Side a= 18 cm Side b= 24 cm Side c= 28 cm
*May 25, 2014*

**3D Shapes & Scale**

Write an explanation of ONE of the following question: (your explanation should be in paragraph form and should be written for a reader who is completely unfamiliar with area/volume scale factors and the square-cube law) 1) Why can aquatic animals grow so much larger than land...
*May 25, 2014*

**3D Shapes & Scale**

An object is scaled up to be 1000x as large. How does the new surface area compare with the original surface area? How does the new volume compare with the original volume?
*May 25, 2014*

**3D Shapes & Scale**

A farmer makes hay bales that are 1m cubes. His trailer can haul 128 hay bales at once. He is going to buy a new machine that makes hay bales that are 2cm cubes. How many bales will fit on the trailer now? (Assume they all fit evenly) Show calculations
*May 25, 2014*

**trig**

A kite string is 65 metres long and makes an angle of 32 degrees with the ground. Calculate the height of the kite above the ground to the nearest metre.
*May 25, 2014*

**geometry**

Find the lateral area and volume of the right triangular prism. side lengths are 3,4,5 and height is 6.How do I find out the apothem?
*May 22, 2014*

**Management**

A firm is assigned the network part 132.99. It selects an 11-bit subnet part. (20 pts) a) Draw the bits for the four octets of the IP address of the first host on the first subnet. b) Convert this answer into dotted decimal notation. c) Draw the bits for the second host on the...
*May 6, 2014*

**chemistry**

the mass of a certain mixture of BaO and CaO is found to be exactly one half that of the mixed sulfates formed from it by the action of H2SO4. calculate the percentage of BaO and CaO in the mixture.
*May 4, 2014*

**Algebra 2**

Can someone please explain how to do this problem? A 450 foot tall building is near a shorter building. A person on top of the shorter building finds the angle of elevation of the roof of the taller building to be 25 degrees and the angle of depression of its base to be 35 ...
*April 30, 2014*

**Math**

How do you simplify this problem? (x + 4y − 5z) − (x − 3y + 6z)
*April 23, 2014*

**arithmetic**

a car traveled a distance of 195 miles in 3 hours 15 minutes what is the unit rate ? oris it answer 60 miles per hour
*April 19, 2014*

**math**

a car travelved a distance of 195 miles in 3 hours 15 minutes what is the unit rate
*April 19, 2014*

**Physics**

The acceleration due to gravity on Earth is 9.80 m/s2. If the mass of a dog is 40.0 kg, what is the weight of the dog?
*April 18, 2014*

**Math**

The longer leg of a triangle is one foot less than twice the shorter leg. The hypotenuse is 17 feet long. Find the area of the triangle.
*April 15, 2014*

**Science**

Explain some modifiable risk factors as well as some actions you can take to avoid dying from a lifestyle disease.
*April 9, 2014*

**Science**

How do lifestyle diseases differ from other diseases?
*April 9, 2014*

**Algebra **

Maria's average speed for a 6 hour trip was 40kph. For the first 4 hours, she drove at an average rate of 50kph. What was her average speed for the last 2 hours?
*April 8, 2014*

**Algebra 2**

How do I find the equation of an ellipse with: Vertices: (-7,10), (-7,-10) Foci: (-7, square root of 19) (-7, - square root of 19) I think the center is (-7,0) and a^2 is 49 I just don't know how to get c^2 so I cant get b^2
*April 7, 2014*

**Biology**

Can someone please tell me if I have the right answers? Pasteur's experiments led to which theory? A. biogenesis theory B. endosymbiont theory C. evolution theory D. spontaneous generation theory I think its A or D Scientists have fossil evidence for which idea for the ...
*April 6, 2014*

**PreCalculus**

The cost C (in dollars) of manufacturing x wheels at Deon's Bicycle Supply is given by the function C(x)= 0.1x^2-60x+22,744. What is the minimum cost of manufacturing wheels? Do not round your answer.
*March 25, 2014*

**Math**

if I have 1 defect in a batch of 54 widgets, what is my quality index?
*March 21, 2014*

**science(check answers)**

Emily
*March 12, 2014*

**science(check answers)**

I got 100%(Thanks:)
*March 12, 2014*

**Computer Tech**

Are they Daydreamin' and Yours Truly?
*March 6, 2014*

**Computer Tech**

I am doing a powerpoint/photoshop project in my computer tech class about a singer that has recently become famous in the world of music. The artist I am researching is Ariana Grande. When I was looking for her albums I found two: Daydreamin' and Yours Truly. Some websites...
*March 6, 2014*

**Math**

A golfer stands 420ft(140 yd) horizontally from the hole and 50ft above the hole. Assuming the ball is hit with an initial speed of 120ft/s, at what angle should it be hit to land in the hole? Assume the path of the ball lies in a plane.
*March 6, 2014*

**Computer Tech**

Thank you!
*March 5, 2014*

**Computer Tech**

I have to do a power point on a singer who has recently become famous. I chose Ariana Grande because she only has two albums. I have been trying to find her song and album release dates but cant find a website. Can someone please see if they could find one? It would be a big ...
*March 5, 2014*

**Algebra 2**

Thank you!
*March 4, 2014*

**Algebra 2**

Okay so I fixed the next two because I added the fractions wrong. 2. y=(1/2)x-(11/4) 3. y=(5/3)x-4
*March 4, 2014*

**Algebra 2**

What am I doing wrong? slope m=(8-6)/(1--5)= m=2/6= m=1/3 m=-3 midpoint (-5+1)/2, 8+6/2)= (-4/2, 14/2)= (-2, 7) y=mx+b= 7=-3(-2)+b = 7=6+b = 1=b equation y=-3x+1
*March 4, 2014*

**Algebra 2**

Can someone please check my answers? The question is: Write an equation for the perpendicular bisector of the line segment joining the two points. (-5,6),(1,8)= y=-3x+1 (1,4),(6,-6)= y=(1/2)x-(3/4) (5,10),(10,7)= y=(5/3)x-(17/3)
*March 4, 2014*

**Algebra 2**

Can someone please explain how to do this problem? A regional soccer tournament has 64 participating teams. In the first round, the number of games played decreases by a factor of one half. Find a rule for the number of games played in the regional soccer tournament. I tried ...
*February 24, 2014*

**Algebra 2 **

I can't figure out how to find the n on top of the sigma. I have the rest of the equation but I just don't know what to do. I'll use "E" for sigma. nEi=1 (10-3i)=-28 Can someone please show me how to do this problem?
*February 19, 2014*

**Algebra 2**

I can't figure out how to find the n on top of the sigma. I have the rest of the equation but I just don't know what to do. I'll use "E" for sigma. nEi=1 (-5+7i)=486 Can someone please show me how to do this problem?
*February 19, 2014*

**physics **

A truck is pulling a car. FT is the magnitude of the force that the truck exerts on the car FC is the magnitude of the force that the car exerts on the truck Consider the following scenarios independently. 1)The truck is driving with a constant velocity, but as it turns out, ...
*February 13, 2014*

**Science! just one question! help ASAP plzzz**

Photosynthesis is required for this process to occur.
*February 11, 2014*

**Algebra 2**

Can someone please explain how to do this problem? Woodrow wins a tic-tac-toe game 65% of the time when he chooses the first square and 32% of the time when his opponent chooses the first square. The player who plays first is chosen by a coin toss. What is the probability that...
*February 9, 2014*

**Algebra 2**

Can someone please check my answers? Find the probability of drawing the given cards from a standard dick of 52 cards (a) with replacement and (b) without replacement. 1.A red card, then a black card a. 1/4 b. 13/51 2.A ten, then the ace of hearts a. 1/676 b. 1/663 3.A face ...
*February 9, 2014*

**Algebra 2**

Do I add them and that's it or do I do something else?
*February 4, 2014*

**Algebra 2**

Theres 12 face cards (4 queens, 4 kings, and 4 jacks) and 4 fours. What would you do with 12/52 and 4/52?
*February 4, 2014*

**Algebra 2**

How would you find the probability of drawing a face card and a 4 out of a standard deck of 52 cards? I got 4/13 but I don't think its right.
*February 4, 2014*

**Algebra 2**

Can someone please explain how to do this problem? The probability that it will rain today is 65%, and the probability that it will rain tomorrow is 25%. The probability that it will rain both days is 35%. What is the probability that it will rain today or tomorrow?
*February 4, 2014*