Saturday
April 30, 2016

# Posts by kellie

Total # Posts: 148

math
What would you do first to order the following numbers from least to greatest? 30%, 2/3, 0.67, 8/9, 0.7
February 27, 2014

Chemistry
In the equation N2 + 2 O2 → 2 NO2, 14 g of nitrogen can produce how many grams of nitrogen dioxide?
October 16, 2013

Buisness Math
You are interested in purchasing a wide-screen television set at Target. On this type of TV, the ratio of screen width to screen height is 16 to 9. If a certain model you are considering has a screen width of 48 inches, what is the height of the screen (in inches)? (Points : 2)
April 30, 2013

Physical Science
what will have a greater effect on the intensity of a sound, doubling its power or halving its distance? Explain your answer.
February 28, 2013

Physics
A 3.0kg object originally at rest explodes and splits into three fragments. One fragment has a mass of .50kg and flies off along the negative x-axis at a speed of 2.8m/s, and another has a mass of 1.3kg and flies off along the negative y-axis at a speed of 1.5m/s. What are the...
December 18, 2012

Physics
A 1560 kg car is traveling with a speed of 14.5 m/s. What is the magnitude of the horizontal net force that is required to bring the car to a halt in a distance of 53.3 m?
September 21, 2012

Chemistry
Given a C=O double bond, how do you determine the length of the bond in different molecules using resonance structures? I know single bonds are longer than double bonds...but how do you distinguish between lengths of the same double bond in different molecules?
September 11, 2012

GEOGRAPHIC
climate
September 6, 2012

chemistry
I posted this question last night but did not get an answer- I am posting again because I have an exam I am studying for and do not understand this concept! Thanks! Using the given data, and the table of Standard Reduction Potentials, find the standard reduction potential for ...
August 3, 2012

chemistry
Using the given data, and the table of Standard Reduction Potentials, find the standard reduction potential for this half reaction: 8H^+ + BaCrO4(s) + 3e- -> Ba^2+ + Cr^3+ + 4H2O(l) given: Ksp (BaCrO4)=2.1E-10 DeltaGf* (kJ/mol): CrO4^2- (-727.75), Cr2O7^2- (-1301.1), H+ (0...
August 2, 2012

chemistry
Glutamate (Glu–) is the conjugate base form of glutamic acid (HGlu). The Ka of glutamic acid is 5.012 x 10^–5. You titrate 50 mL of 0.10 M sodium glutamate solution with 0.05 M HCl solution. Calculate the pH of the solution at the equivalence point. Ive been trying ...
July 28, 2012

chemistry
The Ksp for calcium fluoride (CaF2) is 3.9 x 10^–11 at 25°C. How many moles of solid NaF must be added to 1.00 L of 0.100 M CaCl2 in order to precipitate CaF2? Please help me set up this ICE table and understand how to solve this!! thank you!!
July 28, 2012

chemistry
You have .1 moles of H3PO4 in a soln with a total volume of 250 mL. You then add .15 moles of NaOH and dilute the soln to a total volume of 1L calculate the pH of the resulting soln and the concentrations of all aqueous species. Thanks!!!!
July 26, 2012

chemistry
Sorry- I forgot to add that the last value, (X-.31X) is raised to the 1/2 power
July 24, 2012

chemistry
For the equation, SO2(g) + 1/2 O2(g)-> SO3(g) Kp=9.5 EQUAL partial pressures of SO2 and O2 are placed in an empty reaction vessel and heated to 600 degrees celsius. Assuming that 62% of the SO2 partial pressure has reacting to give S03, calculate the partial pressure of S03...
July 24, 2012

chemistry
The normal boiling point of ethanol is 78.5C. Using the following information: delta H formation (C2H5OH (g))= -234.38 kJ/mol determine the enthalpy of vaporization of ethanol. I know it should be around 39.3 according to a table in my textbook, however, I don't know how ...
July 18, 2012

chemistry
Given: Ti=298K V=.005 L Pt=1 atm P H20 vapor= .0313atm P air= .9687 atm you increase the temperature to 338K; the total pressure remains 1 atm, but the volume increases. Determine the volume at the new temperature (assume water vapor reaches equilibrium at 338K) PLEASE help!! ...
July 5, 2012

Chemistry
A 1.00 L vessel contains 5 g N2 and 1.5 g H2O at 25 degrees C. Calculate the mass of LIQUID water that would be present in the vessel.
July 4, 2012

algebra
Solve the following equation or inequality for the unknown variable. Round answer to two decimal places if necessary.5n + 2 = 27 n=
July 2, 2012

math
A box contains 25 slips of paper, numbered 1 to 25. What is the probability that one will randomly select a number that is divisible by 3 or 7?
June 20, 2012

trig
Use a table of trigonometric values to find the angle è in the right triangle in the following problem. Round to the nearest degree, if necessary. cos è =0.9659 A=? H=20
June 13, 2012

chemistry
25.0 mL tap water is titrated with 0.00500 M EDTA 7.95mL EDTA is required for complete reaction with water hardness what is the molarity of the total water hardness
April 26, 2012

chemistry
A helium-ﬁlled balloon has a volume of 2.83 L at 30 ◦ C. The volume of the balloon decreases to 2.35 L after it is placed outside on a cold day. What is the outside temperature in K? Answer in units of K?
March 26, 2012

Geography
What's one issue that affects the workplace and how it is a problem that creates discussion among people with different points of view?
December 19, 2011

Physics - Check my work please :)
Check this please :D Which of the following three statements used to describe work are true: i)Work is done only if an object moves through a distance ii)Work is done only if energy is transferred from one form to another iii)Work is done only if a force is applied In which of...
December 12, 2011

Physics :D
An electric motor is tested and found 76% efficient. if the input work is 400 J, what is the motors output work? A ramp has a length of 4m and a height of 1.5m. If a man pushes a 40N crate to the top of the ramp with a force of 60N, what is the efficiency of the ramp? How do I...
December 12, 2011

Impacts
How does the health care system affect our society socially, economically and environmentally?
November 23, 2011

How many liters of .0020 M iodine solution can be made from .050 moles of iodine (I2)?
November 23, 2011

Physics
A 85.0 N weight is held in the hand. The upper arm makes an angle of 32.0° with the vertical, and the lower arm is 10.0° above the horizontal. Find the tension in the biceps tendon. See figure below.
November 8, 2011

Physics
where is the 1.91 coming from?
October 31, 2011

Physics
I know that the angular acc is g/d or 9.8/2.14=4.58 rad/s^2
October 31, 2011

Physics
A child sits down on one end of a horizontal seesaw of negligible weight, 2.14 m from the pivot point. No one balances on the other side. Find the instantaneous angular acceleration of the see-saw and the tangential linear acceleration of the child.
October 31, 2011

Physics
An amusement park ride called the Rotor consists of a room in the shape of a vertical cylinder (2.10 m in radius) which, once the riders are inside, begins to rotate, forcing them to the wall. When the room reaches a speed of one rotation every 1.36 s, the floor suddenly drops...
October 23, 2011

physics
Compute the orbital radius of an earth satellite that has an equatorial orbit and always remains above a fixed point P on the earth's surface. Communication satellites have such "geosynchronous" orbits (see figure). These satellites are used to relay radio and ...
October 23, 2011

Physics
A particle with an initial linear momentum of 2.28 kg · m/s directed along the positive x-axis collides with a second particle, which has an initial linear momentum of 4.56 kg · m/s, directed along the positive y-axis. The final momentum of the first particle is ...
October 21, 2011

physics
A bowling ball weighing 40.0 N initially moves at a speed of 4.90 m/s. How long must a force of 54.0 N be applied to the ball to stop it?
October 16, 2011

Physics
A boy of mass 49.4 kg is initially on a skateboard of mass 2.00 kg, moving at a speed of 10.3 m/s. The boy falls off the skateboard, and his center of mass moves forward at a speed of 10.9 m/s. Find the final velocity of the skateboard.
October 16, 2011

Physics
thanks! I'm studying for a test and this helps me tremendously!
October 16, 2011

Physics
Find the linear momentum and kinetic energy of a bullet of mass 4.80e-2 kg moving at a speed of 320 m/s. I found the linear momentum to be 15.36 by doing m*v but I can't figure out the kinetic energy.
October 16, 2011

physics
A rubber ball of mass 18.0 g is dropped from a height of 1.75 m onto a floor. The velocity of the ball is reversed by the collision with the floor, and the ball rebounds to a height of 1.55 m. What impulse was applied to the ball during the collision?
October 16, 2011

Physics
Yea, I was wondering the same thing because mine is wrong too!
October 14, 2011

Physics
A 1.21 kg block slides down a 25.0 m long 25.0° incline at constant velocity. How much work is done by friction?
October 14, 2011

physics
Ten boxes, each 16.0 cm high and weighing 250 N, initially are all side by side on the floor. The boxes are lifted and placed in a vertical stack 1.60 m high in a time interval of 7.00 s. Compute the power necessary to stack the boxes.
October 14, 2011

College Physics
I feel like the acceleration isn't correct.
October 10, 2011

College Physics
I worked out the first equation for part a and found the acceleration to be -0.2304. When doing the second equation, I found work to be -8478.72 J. Can work be negative? I feel like I haven't worked this out correctly.
October 10, 2011

Physics
A man of mass 75.5 kg walks down the aisle of an airplane at a speed of 1.50 m/s in the forward direction while the plane moves at a speed of 305 m/s relative to the earth. (a) Find the man's kinetic energy relative to the plane. (b) Find the man's kinetic energy ...
October 10, 2011

Physics
A hovercraft of mass 77.0 kg can move on a horizontal surface, the x-y plane. A single unbalanced force acts on the hovercraft, but the size of the force is unknown. The hovercraft initially has a velocity of 6.0 m/s in the positive x direction and some time later has a ...
October 7, 2011

physics
Suppose you carry a bag of groceries weighing 127 N from your car to your kitchen, a distance of 48 m, without raising or lowering the bag. (a) What is the work done by the force you exert on the bag?
October 1, 2011

Find the resultant force on (a) the mass m1 = 0.183 kg and (b) the mass m2 = 0.106 kg (the masses are isolated from the earth).. The first mass is 400kg and its 10 cm from the second mass which is 0.183 kg (m1). the second mass is 10 cm away from the third mass which is 0.106 ...
September 29, 2011

Physics
John weighs 660 N, and Marcia weighs 486 N. Estimate the gravitational force between them when they are 0.47 m apart. I've tried finding the mass of john and marcia by doing m=F*a (F being their weight in Newtons and a being 9.8 m/s^2). When I found their masses, I applied...
September 29, 2011

word problem
45 is the only thing it could be.
September 29, 2011

physics
(2.8 miles/41 Seconds) x (60 seconds/1 minute) x (60 minutes/ 1 hour) = 245.85 mph (or miles per hour)
September 29, 2011

Math
c=0.2887
September 28, 2011

animals
take it outside constantly. while outside, when the puppy does its business give her a treat. when your inside and the puppy does it's business (say on the kitchen floor), then point to the puppy and say NO! with force. you don't have to hit it or even touch it. Just ...
September 28, 2011

College physics (simple)
what exactly does mu stand for?
September 27, 2011

College physics (simple)
Two blocks (one on top of the other), each of mass m = 2.4 kg, are pushed along the horizontal surface of a table by a horizontal force P of magnitude 6.8 N, directed to the right. The blocks move together to the right at constant velocity. (a) Find the frictional force ...
September 27, 2011

College physics (simple)
Two blocks (one on top of the other), each of mass m = 2.4 kg, are pushed along the horizontal surface of a table by a horizontal force P of magnitude 6.8 N, directed to the right. The blocks move together to the right at constant velocity. (a) Find the frictional force ...
September 27, 2011

Physics
Two blocks (on top of one another), each of mass m = 2.4 kg, are pushed along the horizontal surface of a table by a horizontal force of magnitude 6.8 N, directed to the right. The blocks move together to the right at constant velocity. (a) Find the frictional force exerted on...
September 27, 2011

math
what is (x to the 3rd power + x to the 2nd power) divided by ((x+4)(X-4)) multiplied by (x+4) divided by (3x to the 4th power + x to the 3rd power + 2x to the 2nd power)
August 3, 2011

early childhood education
B is right
June 22, 2011

Media & american culture
I need help with a thesis sentence about music stating how & why it is more than an important piece of entertainment
June 3, 2011

child care
thank you very much
April 26, 2011

child care
windows of time during which enviorment influences on development are enhanced are called blank periods? a.sensitive b. critical c. crucial d. necessary i say c?
April 26, 2011

math
how do you find ...weekly sales in thousands of items of a product has a seasonal sales record approximated by y=18.1sin(piex/24)+52.9 where x is time in weeks and 1 is the first week in janurary. during which weeks will the sales equal 61,950 items this year? list all the ...
March 25, 2011

geometry
A ship leaves port and heads due east at a rate of 32 miles per hour. Ever since the ship left port, it has been pushed south by a strong constant wind. Five hours after leaving port, the ship is 200 miles away. What is the effective push on the ship from the wind?
February 15, 2011

biology
Who discovered DNA was it James Watson and Francis Crick or Friedrich Miescher ? thankyou
January 17, 2011

chem
What would happen to the specific heat if some of the warm metal shot were lost during the transfer to the calorimeter? Answer a. It would not affect the calculated value of specific heat b. It would cause the calculated value of specific heat to be artificially high c. It ...
October 24, 2010

chemistry
Calculate the change in internal energy for a system that absorbs 242 J of heat and does 193 J of work on the surroundings...
October 24, 2010

Chemistry
At what temperature (oC) will a gas sample occupy 6.1 L if it originally occupies 17.8 L at 27.1oC? I did (v1/t1)=(v2)/(t2) v1=17.8 v2=6.1 t1=27.1 C = 300.25 K the answer i got for t2= 102.894 K which would be -170.106 C This doesnt seem right is it?
October 18, 2010

chemistry
A balloon is filled with 2.3 cm3 helium gas at 112.1 atm pressure. What will be the new pressure (atm) if the volume is changed to 44.7 cm3? P1V1=P2V2 (112.1)(.0023)=(P2)(.0447) the answer i got was 54.85 so would the answer be 54.85 atm?
October 17, 2010

chem
A 16.5 cm3 bubble under the ocean at 2.1 atm and 12.5oC surfaces to 1.0 atm and 22.1oC. What is the new volume (in cm3)? i used (p1)(V1)/T1=(P2)(V2)/T2 (2.1)(.0165)/285.65=(1)(V2)/295.25 THE ANSWER I GOT IS .0335 i changed 16.5 to liters which is why its .0165 is this correct?
October 17, 2010

college chem
A balloon is filled with 2.3 cm3 helium gas at 112.1 atm pressure. What will be the new pressure (atm) if the volume is changed to 44.7 cm3? P1V1=P2V2 (112.1)(.0023)=(P2)(.0447) the answer i got was 54.85 so would the answer be 54.85 atm?
October 17, 2010

drwls history
please could i say a huge thankyou you have helped me alot and i appreciate it thankyou again you are a star! :]
October 17, 2010

HISTORY
please could someone help me answer this question why relations between britain and germany changed in the years 1936-1939? was it because britain didnt want to get involved with germany because they didnt want another war to start? im not sure what to write.
October 17, 2010

chemistry
Determine the density of methane (CH4) in g/L at 24.7oC and 1.1 atm ideal gas eqn: P = (rho)RT, where: pressure: P = 1.1 atm specific gas constant: R, R = |R / M, where |R = 0.0821 L-atm / K-mol and, molecular weightCH4: M = 0.016 kg/mol R = 0.0821/0.016 = 5.13 and temp. T = ...
October 16, 2010

chemistry
A 16.5 cm3 bubble under the ocean at 2.1 atm and 12.5oC surfaces to 1.0 atm and 22.1oC. What is the new volume (in cm3)?
October 13, 2010

chemistry
At what temperature (oC) will a gas sample occupy 6.1 L if it originally occupies 17.8 L at 27.1oC?
October 13, 2010

chemistry
so (1)(.285)=(22.4)(273.15) what do I do next?
October 13, 2010

chemistry
A volume of 0.285 L of a gas at STP weighs 0.537 g. Calculate the molar mass of the gas.
October 13, 2010

gcse french
i need to write about what my future partner will be like i need to use future tense and negative tense any help id appreciate thankyou! :}
October 2, 2010

chemistry
a. How many atoms of hydrogen are in 25.0 g of ammonia (NH3)? Use the format 6.02E+23 for 6.02 x 10^23 b. How many atoms of nitrogen are in the same amount of ammonia I know to find the number of atoms in a gram of a sample you must multiply by 6.02*10^23. So i multiplied 25*6...
September 20, 2010

chemistry
Solid magnesium metal reacts with chlorine gas according to the following equation: Mg + Cl2 --> MgCl2 What mass of magnesium chloride is formed in the reaction between 7 g of Mg and 13.2 g of Cl2 I got 7/24.3= .288 13.2/70.90= 1.861777 thats as far as i got and im stuck ...
September 20, 2010

chemistry
what type of reaction is this Li + H2O --> LiOH A. Combination B. Combustion C. Decomposition Im thinking combination but the H2 is confusing me
September 19, 2010

chemistry
Solid magnesium metal reacts with chlorine gas according to the following equation: Mg + Cl2 --> MgCl2 What mass of magnesium chloride is formed in the reaction between 7 g of Mg and 13.2 g of Cl2 is this correct 7 g+13.2 g = 20.2 grams ?
September 19, 2010

chemistry
2C2H6(g) + 7O2(g) > 4CO2(g) + 6H2O(g) KCl(s) > K(s) + Cl2(g) is this balanced?
September 19, 2010

chemistry
a. How many atoms of hydrogen are in 25.0 g of ammonia (NH3)? Use the format 6.02E+23 for 6.02 x 1023 b. How many atoms of nitrogen are in the same amount of ammonia?
September 17, 2010

chemistry
Solid magnesium metal reacts with chlorine gas according to the following equation: Mg + Cl2 --> MgCl2 What mass of magnesium chloride is formed in the reaction between 7 g of Mg and 13.2 g of Cl2
September 17, 2010

Language Arts
What are 5 general elements or characteristics of the tall tale John Henry?
September 13, 2010

math
Place decimal points in these numbers so that their sum is 519.654. 329 913 477 624
August 17, 2010

chemistry
When 25.0 g of Zn reacts, how many L of H2 gas are formed at 25 °C and a pressure of 854 mmHg?
April 19, 2010

physics
45^2=r^2/r^2....^2cancel's. Take the square root of 45*earths radius 6,380,000(in meters)=4.27x10^7
February 22, 2010

Math
Is my answer correct? The population of a city is 160,000 and is increasing at a rate of 1.5% each year. Approximately when will the population reach 320,000? My answer is approximately 46 years. Is that right? Thx
January 16, 2010

o level economics
Oops, I didn't think about medication. Can I list a job as a need? you need a job to earn money so i would think it's necessary for survival.
December 11, 2009

o level economics
We were asked to come up with a list of needs for ourselves, for our grandparents and for people our age in another continent. For my grandparents I have shelter from the war, warm blankets for winter. For someone my age in Africa I have money for school uniform and school ...
December 11, 2009

Maths (URGENT)
FIND THE POSITION AND NATURE OF THE STATIONARY POINT ON THE CURVE Y = 3x^5 - 10x^3 +15x Can you find dy/dx and can you simplify it please.
November 12, 2009

Algebra
How do you know if a value is a solution for an inequality? How is this different from determining if a value is a solution to an euation? If you replace the equal sign of an equation with an inequality sign, is there ever a time when the same value will be a solution to both ...
September 28, 2009

Math
45% of the tree in a park are maple. There are 27 maple tree in the park. How many tree are there in all in the park?
May 27, 2009