Tuesday

October 21, 2014

October 21, 2014

Total # Posts: 646

**Stat**

Please help with this problem, not sure calculate it. Consider the standard normal distribution and find P(-1.5 < Z < 2.35).
*December 14, 2012*

**Physics**

A kickoff sends a football with an initial velocity of 25 m/s at an angle of 50 degrees above the horizontal. a) find the x and y components of the velocity b) find the time the ball is in the air c) find the horizontal distance the ball travels before hitting the ground d) ...
*November 29, 2012*

**Physics**

a 254-kg crate is pushed horizontally with a force of 740 N. if the coefficient of friction is .20, calculate the acceleration of the crate
*November 29, 2012*

**Geometry**

it is not a right triangle. the easiest way i determine is if they are factors of 3,4 and 5
*November 29, 2012*

**chemistry**

The air exhaled by an average human being might have the following typical combustion, expressed in terms of partial pressures: N2 = 569torr; O2 = 116 torr; CO2 =28 torr; water vapor = 47 torr. what are the mole fractions of each?
*November 25, 2012*

**Physics**

A 50-kg satellite circles the Earth in an orbit with a period of 120 min. What minimum energy is required to change the orbit to another circular orbit with a period of 180 min? (Earth: radius = 6.4 106 m, mass = 6.0 1024 kg)
*November 18, 2012*

**algebra**

Does 6+5x=44
*November 16, 2012*

**Chemistry**

I have one more question, why is the volume of NaCl 0.05 L when we are calculating the mols and 0.1 L when we are calculating mass?
*November 12, 2012*

**Chemistry**

Thankyou so much for all the help and the explanation and your time.
*November 12, 2012*

**Chemistry**

Originally the enthalpy is negative then how does it become postive and I have followed the steps and I came up 47.36 J/g degrees C. Also I don't understand why enthalpy is q if you could please explain that, and thankyou so much.
*November 12, 2012*

**Chemistry**

yes dt is delta T and i think it is the specific heat capacity of NaCl but im not sure
*November 12, 2012*

**Chemistry**

Naoh (aq) + HCl (aq) --> NaCl (aq) + H2O (l) Using the dT determined in part 1, calculate the heat capacity of the calorimeter. Enthalpy of reaction= -58.3 kj/mol, Cs (NaCl = 3.91j/g C)density of 1 M NaCl = 1.037g/mL. dT= 12.88 degrees Celcius.50 mL of 2.00 M HCl and 50 ml ...
*November 12, 2012*

**Chemistry**

50 mL of 2.00 M HCl and 50 ml of 2.05 M NaOH were used
*November 12, 2012*

**Chemistry **

Naoh (aq) + HCl (aq) --> NaCl (aq) + H2O (l) Using the dT determined in part 1, calculate the heat capacity of the calorimeter. Enthalpy of reaction= -58.3 kj/mol, Cs (NaCl = 3.91j/g C)density of 1 M NaCl = 1.037g/mL. dT= 12.88 degrees Celcius.
*November 12, 2012*

**Physics**

Consider a stainless steel annular disk with an outer radius 68mm and inner radius7.4mm. The mass of the disk is 1349 grams. The stainless steel annular disk is allowed to rotate on a frictionless table with the rotation axis at its center. The disk has a small cylinder ...
*October 30, 2012*

**Physics**

Consider a stainless steel annular disk with an outer radius 68mm and inner radius7.4mm. The mass of the disk is 1349 grams. The stainless steel annular disk is allowed to rotate on a frictionless table with the rotation axis at its center. The disk has a small cylinder ...
*October 30, 2012*

**Chemistry**

A sample of the compound prepared in this experiment, weighing .1021g, is dissolved in HNO3 and diluted to a volume of 100mL. A 10mL aliquot of that solution is mixed with 10mL 6 M NH3. The [Cu(NH3)4 2+] in the resulting solution is 5.16x10^-3 M. How many moles of Cu were in ...
*October 23, 2012*

**Physics**

The drawing shows a jet engine suspended beneath the wing of an airplane. The weight W of the engine is 12000 N and acts as shown in the drawing. In flight the engine produces a thrust T of 54200 N that is parallel to the ground. The rotational axis in the drawing is ...
*October 21, 2012*

**Math**

How many integers bewteen 200 and 500 inclusive leave a remainder 1 when divided by 7 and a remainder 3 when divided by 4? Find the smallest positive integer that leaves a remainder 5 when divided by 7, a remainder 6 when divided by 11, and a remainder 4 when divided by 13.
*October 13, 2012*

**Math**

Which Statements of congruence are true and which are false and why? 177 _= 17 871 _= 713 1322 _= 5294 5141 _= 8353 13944 _= 8919 67 x 73 _= 1 x 3 17 x 18 x 19 x 20 _= 4! 83 (144 power) _= 15 (144 power) Their not equals signs...they are three lines on top of one another.
*October 13, 2012*

**Stoichiometry**

A gas mixture at 27 C and 750 torr contains acetone vapor with 70% saturation. Calculate the temperature to which the gas must be cooled, at constant pressure to condense 40% of the acetone.
*October 10, 2012*

**Math**

Sue drives 36 miles to the fair. Every 4 miles, she sees a sign to the fair. . How many signs will she see on her trip in all?
*September 27, 2012*

**Chemistry**

calculate the volume of a rectangular prism with a length of 5.6 , a width of 2.1 , and a height of 6.6 .
*September 27, 2012*

**Chemistry**

Suppose you are asked to find the area of a rectangle that is 2.1- wide by 5.6- long. Your calculator answer would be 11.76 . Now suppose you are asked to enter the answer to two significant figures. (Note that if you do not round your answer to two significant figures, your ...
*September 27, 2012*

**Physics**

In a World Cup soccer match, Juan is running due north toward the goal with a speed of 7.70 relative to the ground. A teammate passes the ball to him. The ball has a speed of 13.3 and is moving in a direction of 30.5 east of north, relative to the ground. a) what is the ...
*September 25, 2012*

**math**

Every year there is a race to the top of the empire state building. In 1993 the winner got to the top in 10 minutes, 18 seconds. how many stairs did the winner go up per second, rounded to the nearest whole number
*September 20, 2012*

**Math**

What is the doubling time of prices which are increasing by 5 percent per year?
*September 19, 2012*

**Precalculus **

What is the doubling time of prices which are increasing by 5 percent per year?
*September 19, 2012*

**Math**

The half-life of radioactive strontium-90 is approximately 32 years. In 1961, radioactive strontium-90 was released into the atmosphere during testing of nuclear weapons, and was absorbed into people's bones. How many years does it take until only 8 percent of the original...
*September 19, 2012*

**math**

Show that f and g are inverse functions algebraically. f(x)=x^3/2 g(x)=3 cuberoot 2x My work so far: (3sqrt2x)^3 ------------ 2 I need help on the numeral part of the expression
*September 11, 2012*

**pre-calc**

Show that f and g are inverse functions algebraically. f(x)=x^3/2 g(x)=3 cuberoot 2x My work so far: (3sqrt2x)^3 ------------ 2 I need help on the numeral part of the expression
*September 11, 2012*

**economics**

Suppose that when a firm increases output by 20%, long-run total cost increases by 50%. The firm will experience
*August 19, 2012*

**health**

Whats the answer?
*August 11, 2012*

**Math**

What scenic structures are featured in chapter 2 Problem Solving on Location?
*August 1, 2012*

**health**

hey .... if its wrong why dont you put the answer !!!
*August 1, 2012*

**math**

x> 2
*July 19, 2012*

**Organic Chemistry**

a) What would be the product formed if diphenylacetylene were reacted with aqueous sulfuric acid? b) What would be the product formed if diphenylacetylene were reacted with two equivalents of HBR?
*July 14, 2012*

**government**

The first American voters were only white, male ---------s
*July 5, 2012*

**statistics**

A particular report included the following table classifying 711 fatal bicycle accidents according to time of day the accident occurred. Time of Day Number of Accidents Midnight to 3 a.m. 38 3 a.m. to 6 a.m. 29 6 a.m. to 9 a.m. 64 9 a.m. to Noon 78 Noon to 3 p.m. 98 3 p.m. to ...
*June 28, 2012*

**calculus**

Please help! ∫17dx/x^2(sqrt(x^2+49)) .. let x=7tan(θ). thank you so much for your help!
*June 6, 2012*

**math**

the gerund phrase is: studying calculus for the noun function I put: predicate noun, correct?
*May 22, 2012*

**essay**

what are some some similarities and differences between dawn and night by elie wiesel?
*May 17, 2012*

**Reading comprehension**

False
*May 9, 2012*

**Reading comprehension**

Reading - Annie, Tuesday, May 8, 2012 at 9:56pm The fish sizes r on a graph Blue fish. 70 feet Red fish. 45 feet Question true or false The blue fish is not as long as the red fish. True or false
*May 9, 2012*

**Reading comprehension**

False
*May 8, 2012*

**Reading comprehension **

Reading - Annie, Tuesday, May 8, 2012 at 9:56pm The fish sizes r on a graph Blue fish. 70 feet Red fish. 45 feet Question true or false The blue fish is not as long as the red fish. True or false
*May 8, 2012*

**Reading comprehension**

@Ms Sue I copied the statement wrong it is The blue fish is not as long as the red fish
*May 8, 2012*

**Reading comprehension**

Ms Sue did u see my answer
*May 8, 2012*

**Reading comprehension**

I think the answer is false because not as long means that the red fish is longer
*May 8, 2012*

**Reading comprehension**

Reading - Annie, Tuesday, May 8, 2012 at 9:56pm The fish sizes r on a graph Blue fish. 70 feet Red fish. 45 feet Question true or false The red fish is not as long as the blue fish. True or false
*May 8, 2012*

**Reading**

The fish sizes r on a graph Blue fish. 70 feet Red fish. 45 feet Question true or false The red fish is not as long as the blue fish. True or false
*May 8, 2012*

**Reading**

I need to know if the statement is true or false
*May 8, 2012*

**Reading**

If a blue fish is 70 ft long and a red fish is 45 feet long. This is statement true or false. A blue fish is not as long as a red fish
*May 8, 2012*

**Math**

What is 0.5 to the tenth power, as a fraction? a.k.a. 0.0009765625 as a fraction
*May 2, 2012*

**english**

In the book Roll of Thunder, Hear my Cry, what is the double meaning of Mr. Granger's words when he says he ain't gonna stand for no hanging on his place, and if y'all touch one hair on that boy's head, he's gonna hold every man responsible"?
*April 26, 2012*

**chemistry**

what is the volume at STP of a sample of CO2 that has a volume of 75.0 ML at 30c and 680 mm Hg
*April 26, 2012*

**chem**

a volume of 20. l of O2 os warmed from -30c to 85c what is the new volume if the pressure is kept constant
*April 24, 2012*

**geometry**

If m = 6.25 cm and n = 10 cm, what is the measure of angle ?
*April 16, 2012*

**Math**

Error Analysis: A friend says that the retail price of an item with a wholesale price of $80 is $100 after a markup of 125%. Describ and correct the error in the person's statement.
*April 12, 2012*

**English**

I read A partial rememberance of a puerto rican childhood. I'm suppose to be writing a essay but I need a thesis to do an outline.
*March 25, 2012*

**English**

Women is going crazy that a man doesn't care for her so it is driving her crazy. Men do harsh things like abusing their wife.
*March 25, 2012*

**English**

I am writing a paper and I was wondering does this sound like a good thesis? Cofer shows not only the crazyness women but also shows how men can be harsh.
*March 25, 2012*

**Chemistry PLEASE HELP!!**

energy from glucose is obtained from this equation when it is oxidized in the body C6H12O6 + 6O2 --> 6CO2 + 6H2O What is the catalyst in this equation?
*March 22, 2012*

**English**

isn't the question actually something like "You're walking home alone when you....." ??
*March 22, 2012*

**physics**

A 6.5 g bullet leaves the muzzle of a rifle with a speed of 347 m/s. What total constant force is exerted on the bullet while it is traveling down the 0.83 m long barrel of the rifle?
*March 19, 2012*

**physics**

The sum of two forces, one having a magni- tude of 2 N acting due west and other having a magnitude of 8 N acting due north is?
*March 19, 2012*

**physics**

A blimp is traveling due North at 80km/hr with respect to the air, while the wind is blowing from northeast at 25km/hr with respect to the ground. What is the velocity of the blimp with respect to the ground? Thanks.
*March 14, 2012*

**Chemistry**

1) Prepare 100mL of 10%w/w HCl from 37%concentrated HCl(density of 37%HCl =1.19g/ml) 2) Prepare 100mL of 10%w/v HCl from 37% concentrated HCl(density of 37%HCl=1.19g/ml) Can you please show the calculation steps for 1) & 2)? Is 10%w/v HCl the same as 10%w/w HCl? Thanks.
*March 12, 2012*

**English - thank you ms sue i will wait **

i will wait and thanks a lot
*March 11, 2012*

**English - please help i had posted 3 times and no **

please can you make correction in my short story. i am very bad at grammar and even my parents does not khnow english well. can you proof reed my short story. Love-Hate story “Happy birthday Khushi”, her family said as they came to her room at midnight. “Thank ...
*March 11, 2012*

**eng lit**

please proof read my short story please and make some correction Love-Hate story “Happy birthday Khushi”, her family said as they came to her room at midnight. “Thank you, Mom, Dad and my lovely sister”, Khushi said with a huge smile. Khushi laid down on ...
*March 9, 2012*

**Chemistry**

Oh, sorry. 25 g of Zinc and 30 g of sulfur. I already found that Zinc is the limiting reagent, but I'm stuck on the rest.
*March 8, 2012*

**Chemistry**

Zinc and sulfur react to form zinc sulfide according to the equation Zn+S=>ZnS a) How many grams of ZnS will be formed? b) How many grams of the excess reactant will remain after the reaction is over?
*March 8, 2012*

**Physics help.**

If a curve with a radius of 94.5 m is perfectly banked for a car traveling 72.4 km/h, what must be the coefficient of static friction for a car not to skid when traveling at 96.4 km/h?
*March 5, 2012*

**Biology**

The genes for hair color and eye color are linked
*March 2, 2012*

**Math **

r=40-2t shows the relationship between the average rate of speed, r, of a car in meters per second, and the time, t,in seconds, as the car slows down.
*February 26, 2012*

**College Physics**

A Fraunhofer diffration pattern is produced on a screen 210cm from a single slit. The distance from the center of the central maximum to the first-order maximum is 7560 times the wavelength (lambda). Calculate slit width. Answer in __m
*February 23, 2012*

**College Physics**

The lines in a grating are uniformly spaced at 1530 nm. Calculate the angular separation of the second order bright fringes between light of wavelength 600nm and 603.11nm. Answer in __mrad
*February 23, 2012*

**statistics**

f someone scored two Standard Deviations above the Mean on a standardized test where the Mean = 100 and the Standard Deviation = 15, then that person’s numerical score would be…? A. 125 B. 130 C. 160 D. 90th Percentile
*February 20, 2012*

**Chidren,Families,and Society**

Larry is a very aggressive four-year-old child.he watches many television programs that contain violence.it's most likely that
*February 20, 2012*

**history**

Help needed! I'm comparing France and the USA. If France had the Paris vs. Versaille conflict with regards to the city capital. As much as capitals showed the unity amongst the people, it also produced conflicts between different sectors of society. What did the United ...
*February 19, 2012*

**Chemistry**

How to prepare 100mL of 3% w/w Hydrogen Peroxide from 30% w/w Hydrogen Peroxide?Specific Gravity of 30%w/w Hydrogen Peroxide is 1.11g/mL. Can you please show the calculation steps? Thanks.
*February 18, 2012*

**history**

okay. thank you :)
*February 18, 2012*

**history**

Thank you. :) Though I was thinking, should it be "full potential"? or just the potential.. I mean, urban life is still moving forward so there's no way of telling that it has reached its full potential, right? :) Or maybe I'm just overthinking.
*February 18, 2012*

**history**

Well, basically, here is what I've got so far.. I believe that the industrial revolution promoted urban life. To a certain point, people would a associate urban living to better living. Migration from rural areas to urban areas was popular back then. During the industrial ...
*February 18, 2012*

**history**

Cities and urban areas were a source of economic opportunities in the post-Medieval Western world. How was the full potential of Western cities and urban areas in this regard was realized during the Industrial Revolution?
*February 18, 2012*

**Chilsren,Families,and Society**

18.Which of the following statements implies rules of confidentality?A.You can tell the librarian that you heard that Joey's father was arrested for drug use.B.Parents must give permission to release school records to the child's therapist at the community clinic. C. ...
*February 17, 2012*

**Chemistry**

How do I prepare 100mL of 10g/L HCl from concentrated HCl(37%HCl, density 1.19g/mL) Is it 2.28mL of conc HCl dilute to 100mL with water? Please show the calculation steps.
*February 16, 2012*

**physics**

t(s)=0.0,1.0,2.0,3.0,4.0,5.0,6.0,7.0 v(m/s)=0.0,4.6,8.9,13.4,18.0,22.9,27.6,32.0 find the area underneath the graph between t=2.0s and t=6.0s, i know i will have to break this down into two separate shapes, a rectangle and a triangle then add them together, i just don't ...
*February 8, 2012*

**online**

I bought car for $32.000. Interest 11%. What my payment and how long will take?
*February 3, 2012*

**math**

The product of two consecutive intergers is 56. Find the intergers.
*January 31, 2012*

**Engineering/Chemistry**

m_dot = 2000 kg/h q = 111600 kJ/h T_final = 95C C_p = 3.9 kJ/(kgC) equation: q = m_dot*c_p*(T_initial-T_final) plug in all the value and solve for T_initial *NOTE* remeber deta_T both in C and K is the same. So don't worry
*January 31, 2012*

**Science**

Can u help me find a picture of a sea sponge budding ?
*January 27, 2012*

**chemistry**

Aluminum metal generates H2 gas when dropped into 6.00 M HCl. Calculate the mass of H2 that will form from the complete reaction of 0.365 g Al with 8.40 mL of 6.00 M HCl.
*January 26, 2012*

**math**

Determine the values of k for which the function f(x)= 4x^2-3x+2kx+1 has two zeros , check these values in the original equation
*January 25, 2012*

**math**

Determine the values of k for which the function f(x)= 4x^2-3x+2kx+1 has two zeros , check these values in the original equation
*January 25, 2012*

**math**

Factor completely x(x+1)^2-4(x+1) (2x+3)^2-9
*January 25, 2012*

**math**

solve the equation (1/4)^x = (1/8)^2x-1 solve the equation 3^-x+2=27^x-4
*January 25, 2012*

**science**

Why is a pizza cutter handle a lever?
*January 22, 2012*

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