# Posts by brittany

Total # Posts: 948

another physics problem that i dont understnad..
your awesome! but where did you get the 95 in the first equation?

another physics problem that i dont understnad..
An 58.0 N box of clothes is pulled 5.2 m up a 30.0° ramp by a force of 95 N that points along the ramp. If the coefficient of kinetic friction between the box and the ramp is 0.22, calculate the change in the box's kinetic energy.

A ball of mass 522 g starts at rest and slides down a frictionless track, as shown below. It leaves the track horizontally, striking the ground a distance x = 0.93 m from the end of the track after falling a vertical distance h2 = 1.18 m from the end of the track. (a) At what ...

physics

A flight attendant pulls her 70.0 N flight bag a distance of 263 m along a level airport floor at a constant speed. The force she exerts is 41.0 N at an angle of 52.0° above the horizontal. (a) Find the work she does on the flight bag. (b) Find the work done by the force ...

geometry
A ramp to a door is to rise one foot for every five of horizontal distance from the building must the end de placed if the door is 2.3 feet above the ground?

english
what it means to be a black family in the 21 centary

Chemistry
Enter the Net Ionic Equation including phases, for the reaction of AgNO3 and Ba(OH)2.

Social Studies
I need help looking for an interview with Amelia Earhart, written or audio/visual, for a research paper. This is the last citation I need, and I cannot find a direct interview. Please help.

spelling
man :woman :: curved

Medical Terminology
wow, you all are very rude

Assume that the average speed of a moving object at 1 m was initial velocity and average spped of your cvart 5 m was its final velocity. calculate the change in velocity of your cart from 1 m to 5m. Show your work

chemistry
An alpha particle (mass = 6.6 × 10-24 g) emitted by radium travels at 3.4 × 107± 0.1 × 107 mi/h. What is its de Broglie wavelength (in meters)?

college philosophy (Mill)
how can mill say that “there is no parity between the feeling of a person for his own opinion, and the feeling of another who is offended at his holding it; no more than between the desire of a thief to take a purse, and the desire of the right owner to keep it”? ...

chemistry
To begin the problem, I calculated the [OH-] from the pH. 14-9.3 = 4.7 pOH, [OH-] = 10^-(4.7) = 1.995x10^-5 Here's where things get difficult. NH4Cl breaks apart in water into NH4+ and Cl-. Therefore we can say the 1.2M is the concentration of NH4+. NH4+ combines with OH ...

I need help paraphrazing a section from Robert Browning's poem "My Last Duchess" here it is : Fra Pandolf chanced to say "Her mantle laps Over my lady's wrist too much,"

chemistry
How do I write the skeleton equation representing the heating o f magnesium carbonate to produce solid magnesium oxide and carbon dioxide gas?

rachel was able to average 69 miles per hour on a 9 hour car trip which is the best estimate for the for the number of miles of the 9 hours car trip

hca 270
Lady, you are so rude. Why are you even on this "help" site if all you do is chastise people?

chemistry
If 100 mL of a 3 M solution of sodium hydroxide is diluted to a total volume of 600 mL with distilled water, what will the final concentration of sodium hydroxide be?

statistics
The first class in a relative frequency table is 50–59 and the corresponding relative frequency is 0.2. What does the 0.2 value indicate?

math
Factor the four-term polynomial. mn - 15 + 3m - 5n

Math
Use substitution to solve: 3x-2y=2 x-3y=4

Physics I
23m is wrong

how do you add a fraction with a different denominator

Have the regulatory agencies been outlawed by the federal courts?

eight states border one or more of the five great lakes.write a fraction reprersenting the part of the 50 states that border a great lake.write the fraction in it's simplest forms.

Physics
Alright i can not get this question i'm confused

college physics
A drag racer, starting from rest, speeds up for 402 m with an acceleration of +24.0 m/s2. A parachute then opens, slowing the car down with an acceleration of -5.40 m/s2. How fast is the racer moving 3.75 102 m after the parachute opens

physics
While standing on a bridge 15.0 m above the ground, you drop a stone from rest. When the stone has fallen 3.10 m, you throw a second stone straight down. What initial velocity must you give the second stone if they are both to reach the ground at the same instant? Take the ...

PHYSICS
The intensity level of a sound is reported in unit decibel(dB). how does IL change if we increase a sound intensity by a factor of 10? a)remains the same b) increases by 1dB to 2dB c)it increases by 2dB to 20dB d)it increases by 20dB to 200dB e) it decreases equations... IL=10...

Physics
The intensity level of a sound is reported in unit decibel(dB). how does IL change if we increase a sound intensity by a factor of 10? a)remains the same b) increases by 1dB to 2dB c)it increases by 2dB to 20dB d)it increases by 20dB to 200dB e) it decreases equations... IL=10...

Post at least 2 challenges that many companies face in the areas of ethics and 2 challenges in the area of social responsibility. What exactly is management's role in addressing each of these issues? Is ethics standard way of getting things done im completely confused

physics
what happens to acceleration due to gravity if you climb the tallest mountains on the earth ?

spanish
what kind of music is more boring ?

english
about nine hundred known comets comet's tail can extend 93.2 million miles comet's nucleus can be .5 to 12 miles across once considered bad omens today greeted with excitement and curiosity have elliptical orbits orbits vary widerly one of the best-known comets named ...

english
well i have a worksheet that says combining sentences to write a paragraph and its really long. if you want me to i can type the whole thing.

english
I have a combining sentence worksheet to do and I don't know how to do that.

Literary Analysis and Composition
I got a 94.1%! Thanks!!

MAth
find the next three numbers in the pattern 2/3, 1 5/12, 2 1/6, 2 11/12 _, _, _

physics
A football player runs the pattern given in the drawing by the three displacement vectors A, B, and C . The magnitudes of these vectors are A = 5 m, B = 16.0 m, and C = 16.0 m. Using the component method, find the magnitude and direction è of the resultant vector A,B,C...

math
There would be 13 cars and 5 ships.

Government
Thank you so much! :)

Government
I need both actually.

Government
How many years can an Oklahoma senator serve? and how many consecutive terms can they serve?

algebra
0=0 so the answer is all real numbers

American Education
As the supply of teachers diminishes, the demand on new and existing teachers increases. As a potential teacher and educator, identify two perceived challenges of the teaching profession that you may struggle with the most. In contrast, identify two opportunities you may have...

Physics
A gas sample is confined to a chamber with a movable piston. A small load is placed on the piston and the system is allowed to reach equilibrium, shown above. If the weight of the piston and the load is F=70.0 N and the piston has an area of A=9.00x10-4 m2, what is the ...

algebra 2
SImplify the expressions. 1. x to the seventh times 1/x squared 2. (3 quaredx to the sixth)cubed 3. x to the nith/ x negitive squared 4. 15xsquaredy/ 6x to the fourthy to the fifth times 6xcubed y squared/5xy USE direct substitution to evaluate the polynomial function for ...

social studies
what is the most useful indicator of the degree of democracy reached by a particular society is whether it has a:

chemistry
Are the following quantum number combinations allowed? Else show any one way to correct them. a. n = 2, l = 0 m = -1 b. n = 4, l = 3 m = -1 c. n = 1, l = 0 m = 0 d. n = 3, l = 1 m = -2

chemistry
How fast must a 56.5 g tennis ball travel in order to have a de-Broglie wavelength that is equal to that of a photon of green light (5400 Angstroms)?

chemistry
An alpha particle has a mass of 6.6*10-24 g travels at 3.4*107 +/- 0.1*107 mi/h a. What is the DeBroglie wavelength (in meters)? b. What is the uncertainty in position?

chemistry
A radio wave has a frequency of 3.6 * 10 10 Hz. What is the energy of one photon of this radiation? thank you.

Chemistry
How many molecules are present in 1.00 mg of asprin, C9H8O4?

SCIENCE
The reactants methane and oxygen combine in a combustion reaction to form carbon dioxide and water.

biology
No, the blood leaves the heart and goes to one of 2 places; one is pulmonary circulation which involves going to the lungs to be oxygenated and the other is systemic circulation which carries oxygenated blood to the rest of the body. The blood going to your stomach would be a ...

biology
They all exhibit the characteristics of living things, ie made of cells, reproduce, maintain homeostasis, grow and develop, etc.

AP Government
d) because before the 20th century voters would be given multiple identities by party machines and so they would vote more than once in elections so it appeared that voter turnout was high and that it has declined during the 20th century. Actually it has seemed to decline ...

Chemistry
Thank you soo much! :)

Chemistry
How do I convert the following quantity to moles? 44.0g of H2O

AP Chemistry
You still have the effect of the water absorbing the heat that DrBob stated in b.

chemistry
use thermochemical equations shown below to determine enthalpy for the reaction: H2CO3-->H2O+CO2 1) H2CO3 --> H2CO + O2 H; 224 KJ 2)H2CO + O2 --> H2O + CO2 H; -100KJ I know this problem is one that you have to rewrite the equations to get the equation in the original ...

chemistry
use thermochemical equations shown below to determine enthalpy for the reaction: H2CO3-->H2O+CO2 1) H2CO3 --> H2CO + O2 H; 224 KJ 2)H2CO + O2 --> H2O + CO2 H; -100KJ I know this problem is one that you have to rewrite the equations to get the equation in the original ...

chemistry
Hydrogen peroxide decomposes according to the following thermochemical reaction H2O2 --> H2O +1/2 O2 ; H= -98.2 kJ calculate the change in enthalpy when 1.00 g of hydrogen peroxide decomposes.

chemistry
Determine mass of iron heated to 85.0 degrees C to add to 54.0 g of ice to produce water at 12.5 degrees C. The specific heat of iron is 0.045 J/g C.

Chemistry
determine the final temp when 45.8 g of aluminum at -5.2 degrees C is added to a mixture of 45.0 grams of ice at 0.00 degrees C and 2000.0 g of water at 95.0 degrees C.

Chemistry
Please help me answer the question: What does it mean Write a net ionic equation for the reaction 2HCl + Ca(OH)2 -> CaCl2 + 2H20

math

math
The chance that you get each question correct is 1/2. To calculate the probability of a perfect score on a 4 question test, you muliply the chance for each correct answer, sooo 1/2 X 1/2 X 1/2 X 1/2 = 1/16 On the 10 question test, it would be 1/2 X 1/2 X 1/2 X 1/2 X 1/2 X 1/2 ...

antonyms
give/take left/right up/down in/out sour/sweet crooked/straight

Chemistry
Thanks!

Chemistry
What kind of reaction is the following equation? Ca + H20 -> Ca(OH)2 + H2 (g)

Capitals in Sentences
For my geography paper I am talking about the diseases of Foot and Mouth Disease, Smallpox, and Spanish Influenza. Throughout my paper I am not sure whether I should be capitalizing these words or keeping them lower case. example sentences below: - This report will discuss the...

Physical Science
A red light source and a green light source shine on a white screen. what color will the screen be? Explain your answer. If a blue object is placed in front of the screen, what color will it be? explain your answer

Physical Science
If an engine must do 500 joules of work to pull a 100 N load up to a height of 4 meters, What is the efficiency of the engine?

Well you have to divide 64g by the molar mass of CO (28.01) to find the moles of CO you have. Then you multiple the moles by 3.02*10^23 to find the molecules.

Payroll Accounting
Help with my Payroll Accounting Final Project. Class AC122-05. Please. I am so lost.

Economics
If a city's unemployment rate is at 8% and the natural rate is 3% with the current GDP at \$100 million what is the full employment equilibrium?

Trigonometry
State the amplitude of the following functions: a) y = cos theta b) y = 1/2cos theta c) y = -2cos theta

History
thank you so much

History
I have to know,every time i search this question it only tells me where he went. Why did Christopher Columbus go on voyages?

math
+150

Dr.Bob222
Thank you so much DrBobb for all of your help!!

Dr.Bob222
this is all my work so far on the limiting reagent problem I asked about yesterday about Calcium nitrate and ammonium fluoride.... 28.42g/164.1= .17318 mol Ca(NO3)2 29.6g/37.042=.79909 mol (NH4)F (1mol Ca(NO3)2 /.17318) x (2mol (NH4)F/x)=.34636 (2 mol (NH4)F/.79909)x(1 mol Ca(...

chmistry
gunpowder is a mixture of potassium nitrate , sulfur and carbon in th proportion (by mass) of 6:1:1 (KNO3;S:C). A typical riflr shell contains 3.2 gunpowder. How many moles of each compnent are there in our sample gunpowder? KNO3 mole: C: mol S: mol Thank you for helping!!

chm
gunpowder is a mixture of potassium nitrate , sulfur and carbon in th proportion (by mass) of 6:1:1 (KNO3;S:C). A typical riflr shell contains 3.2 gunpowder. How many moles of each compnent are there in our sample gunpowder?

english
give 5 reasons why verbs are important to your life

Physics
A wagon with a weight of 200.00 N is accelerated across a level surface at 0.8 m/sec squared. What net force acts on the wagon?

physics
A sled is pulled at a constant velocity across a horizontal snow surface. If a force of 100 N is applied to the sled at an angle of 40 degrees to the ground, what is the force of friction between the sled and the snow?

chemistry
D --> E and E --> F have yield of 61% and 83% respectively. what is the overall percent yield for conversion D --> F? thank you.

chemistry
chemical analysis shows hemoglobin contains 0.34% of Fe by mass. How many moles of Fe wold be in a 100.00 g sample? Thank you.

Chemistry
metal hydrides react with water to form hydrogen gas and the metal hydroxide. How do you calculate the mass of hydrogen gas that can be prepared from 3.78 g of SrH2 and 3.5 g of H2O? a) how many moles of H2 can be produced from given mass of SrH2? b) How many grams of H2? ...

Chemistry
28.42g/164.1= .17318 mol Ca(NO3)2 29.6g/37.042=.79909 mol (NH4)F (1mol Ca(NO3)2 /.17318) x (2mol (NH4)F/x)=.34636 (2 mol (NH4)F/.79909)x(1 mol Ca(NO3)2/x)=.399545 so (NH4)F (.34636) is limiting reagent. now I'm stuck. Not sure what you mean about subtracting moles from ...

Chemistry
Calcium nitrate and ammoonium fluoride react to form calcium fluoride, dinitrogenmonoxide and water vapor. What mass of each substance is present after 28.42 g of calcium nitrate and 29.60 g of ammonium fluoride react completely?

Chemistry
Elemental sulfur occurs as octatomic molecule S8. What is the mass of Fluorine gas needed to react completely with 19.9 g of Sulfur to form sulfur hexafluoride?

Physics
9.8= 1/2mv^2 + 1/4mv^2 9.8= (3/4)(mv^2) [9.8*(4/3)]/m= V^2= 1.307 sqr(1.307)=V= 1.14 I have a question.. Why is there 1/2 and 1/4 in the first question.. are they just constants?

Spanish
La persona que se murio mas recientemente fue una mujer. El deiciocho de agosto era la fecha que ella fue al hospital. "Fue" is past tense of the verb "to be" or "to go". "Era" is USED TO BE. Remember that to help you in other sentences...

writing
Have you ever been seen as a hero in anyway? Maybe you were seen as a hero in your family's eyes or another child?

health
compare 2 countries to the US in way people eat type of food. include heart disease information

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