Friday
September 19, 2014

Posts by JOshua


Total # Posts: 509

Physics
A steel ball is dropped onto a hard floor from a height of 1.80 m and rebounds to a height of 1.64 m. (Assume that the positive direction is upward.) (a) Calculate its velocity just before it strikes the floor. m/s (b) Calculate its velocity just after it leaves the floor on ...
September 17, 2014

Physics
A swimmer bounces straight up from a diving board and falls feet first into a pool. She starts with a velocity of 3.00 m/s, and her takeoff point is 1.10 m above the pool. (a) How long are her feet in the air? s (b) What is her highest point above the board? m (c) What is her ...
September 17, 2014

Analytical CHM
Rank the following items in order of accuracy when they are used for their intended purpose: Volumetric pipet, beaker, Erlenmeyer flask, MOHR pipet, graduated cylinder, volumetric flask, buret. Explain your asnwer below Most accurate 1. 2. 3. 4. 5. 6. Least accurate 7. ...
September 5, 2014

Grammar
What is the simple subject and predicate in the sentence: They reach up to 60 inches tall, or 5 feet!
August 19, 2014

auto repair technician
Is there anyone taking the automobile technician course in penn foster wanting to team up to study together. I'm having trouble with exam #004846
August 19, 2014

life science
Why this fossils are important discoveries? They have features similar to homo sapiens, and the provide more information about the evolution of humans.
July 31, 2014

Physics
how much does a 2 lietr bottle of soda pop weigh in pounds? assume that the pop has the density ofg water,namely 1 kg\lietr and that the weight of the bottle itself is negligible?
July 14, 2014

Chem
A mixture is prepared by adding 28.6 mL of 0.169 M Na3PO4 to 39.7 mL of 0.255 M Ca(NO3)2. What mass of Ca3(PO4)2 will be formed?
July 1, 2014

Chem
How many grams of water could have its temperature raised from 25 ºC (room temperature) to 100 ºC (the boiling point of water) by the amount of energy released in the formation of 4.0 mol of H2 from hydrogen atoms? The bond energy of H2 is 435 kJ/mol. The specific ...
July 1, 2014

physics, science
What effect does friction have upon a) ball bounce angle, and b) ‘speed’ of the court? Refer to clay and grass courts to help illustrate your answer. (4 marks) please help!
June 30, 2014

physics
If a particle has kinetic energy K = 60 MeV when its momentum magnitude p = 100 MeV/c, what is the ratio m/me of its mass to the electron mass?
May 3, 2014

chemistry
thanks it helped
March 25, 2014

chemistry
please help! how do i find the molecular mass of C3H5O2 molecular mass of 292 g.
March 25, 2014

Computer science
Take two inputs from user: N - #items B - budget. There are S items, each with some price value, out of which user needs to select N items in such a way that total bill does not exceed B. The program should print all such combination of N products.
February 23, 2014

Chemistry
What is the final Celsius temperature if 4.42 L of nitric oxide gas at 35°C is cooled until the volume reaches 1.00 L? Assume the pressure remains constant.
February 14, 2014

Math
Sierra spent 2/3 of her earnings on clothes and 1/5 on school supplies. She saved the rest. What fraction of her earnings did she save?
February 11, 2014

Social Studies
so what is the answer
February 10, 2014

Math
Can you please help with the following: x^2+2x-35=0 I can't remember how to get the different possibilities. Appreciate help, thanks
February 7, 2014

Math
A dog ate 48 bones. The other dog ate 47 bones. How much bones did both dogs eat?
February 6, 2014

Physics
Can you please help with the following: x^2+2x-35=0 I can't remember how to get the different possibilities. Appreciate help, thanks
February 6, 2014

Art
what 2 colors make purple?
February 5, 2014

algebra
12$
January 25, 2014

Calculus 1
On the graph of f(x) = 8*sin(3pi*x), points P and Q are at consecutive lowest and highest points with P occurring before Q. Find the slope of the line which passes through P and Q. Slope = ? I have tried 48/pi and it didn't work
January 23, 2014

science(CHECK ANSWERS)
how do you know they are right?
January 10, 2014

Math
Yes but I do not know how to solve your way of the equation.
January 9, 2014

Math
I also got 1 and 0 but I do not know.
January 9, 2014

Math
So would the answer be 31?
January 9, 2014

Math
How can I put that in an equation? would it be n+n+2+n+3=93?
January 9, 2014

Math
What does it mean by, "The sum of three consecutive odd integers is 93."
January 9, 2014

science(please check answers)
Hay Matt, number 2 is wrong it's d
December 20, 2013

science plz help right now!!!!
they are all right Elena. Good Job!
December 16, 2013

science plz help right now!!!!
1.B 2.D 3.C 4.D 5.C 6.B 7.D 8.B
December 16, 2013

calculus
lim t-> -infinity for sqrt(4t^2-5t-1)/(2t-3) I get infinity or -infinity, but the real answer is -1. How does this occur?
October 16, 2013

calculus
oops double posted
October 16, 2013

calculus
The question is: tan(arcsinx)= I know that inverse of sin is 1/sqrt(1-x^2) however this question still confuses me. The outcome is x/sqrt(1-x^2), how did the tan create the additional x ?
October 16, 2013

calculus
I am still confused. hm.
October 16, 2013

calculus
f(x) = ln(ln(lnx)) has the domain of (e, infinity). I am not sure how this occurs however. I know in the case of ln x, x must be greater than 0. However where does e come from. e is the base of log in the case of ln, but something is just not clicking for me.
October 16, 2013

calculus
so basically what i said in the original question is irrelevant.
October 16, 2013

calculus
oops i think i meant to say that the derivative is 1/sqrt(1-x^2) dang I am tired.
October 16, 2013

calculus
The question is: tan(arcsinx)= I know that inverse of sin is 1/sqrt(1-x^2) however this question still confuses me. The outcome is x/sqrt(1-x^2), how did the tan create the additional x ?
October 16, 2013

Calculus
Perfect, thanks.
October 14, 2013

Calculus
I need step-by-step help for solving the lim x -> 0 for the function sin(x)/(x + tan(x)) I can do simpler ones, but this one throws me off. Thanks.
October 14, 2013

chemistry
A mixture was formed by adding 4.56g of KCL to water to make 175mL of solution. The density if the solution is 1.12g/mL. Whatis the mass percent and what is the molarity of the potassium chloride solution?
August 8, 2013

math
Translate the following statement into a numerical expression: 3 times the quantity of H less 233.
July 30, 2013

College Physics
1. In a region of two-dimensional space, there are three fixed charges: +1 mC at (0, 0), −2 mC at (18 mm, -3 mm), and +3 mC at (-8 mm, 12 mm). What is the net force on the −2-mC charge? Find the magnitude and direction (counterclockwise from the x-axis).
July 9, 2013

Math
Is 25x squared + 40x +15 a perfect square? And how do you factor it if it is?
May 24, 2013

Math
Using your answer to the question above, what is the net dollar amount of that rose order?
May 20, 2013

Religion
The days of Triduum are measured from _ _ _ _ _ _ to _ _ _ _ _ _.
April 10, 2013

7th Grade Language Arts!
All of them are write bob. Good Job!
April 3, 2013

Physics
A brick is thrown off a building at a 25 degree angle at 10m/s, it lands 40 meters away, How high is the building?
March 26, 2013

chemistry
85.0 of is initially at room temperature (22.0). A chilled steel rod at 2.0 is placed in the water. If the final temperature of the system is 21.2, what is the mass of the steel bar? Specific heat of water = 4.18 Specific heat of steel = 0.452 My answer was 32.752. I rounded ...
March 26, 2013

chemistry
85.0 of is initially at room temperature (22.0). A chilled steel rod at 2.0 is placed in the water. If the final temperature of the system is 21.2, what is the mass of the steel bar? Specific heat of water = 4.18 Specific heat of steel = 0.452 My answer was 32.752. I rounded ...
March 26, 2013

math
lol
March 17, 2013

math
Is there a way to prove this in upwards of 5 steps? Apparently there is?? Prove. 2^n + 2^n = 2^(n+1) I posted this before however apparently I need something more indepth in terms of the # of steps.
March 17, 2013

math
ok thanks
March 17, 2013

math
Alrighty, are there particular times you guys are most active?
March 17, 2013

math
Is it possible to set up a time to do a live chat with a tutor here? like for 15-20 min or so. I have a few questions, nothing major but would like to have answers explained to me/ any additional questions I have. Would be cool, i understand it is asking for alot.
March 17, 2013

Chemistry
A 100.0 g sample of water at 27.0°C is poured into a 77.4 g sample of water at 89.0°C. What will be the final temperature of the water?
March 14, 2013

Algebra
447
March 12, 2013

calculus
12
March 12, 2013

math
If i have a piece of pipe that is half a yard long and it's divided into 5 pieces what is the length of each piece in yards?
February 13, 2013

home economics
mention the types of disposal of fullness?
February 7, 2013

Math 8 -HELP! (PLZ!)
1. Write the fraction two-fourths as a percent. Round to the nearest hundredth of a percent where necessary. (1 point) 50% 20% 54% 48% 2. Write the decimal 0.041 as a percent. (1 point) 41% 4.1% 410% 0.41% 3. In the small country of Varia, a bill becomes law only if thirty-...
January 22, 2013

science
What can engineers do to help buildings survive in an earthquake?
January 17, 2013

Grammar
No the correct answer is My parents and I are jumping.
January 17, 2013

Grammar
That is wrong it should be My parents and I.
January 17, 2013

Science
7/10 Thank you so much.
January 17, 2013

Science
1/4 is that right
January 17, 2013

Science
YEs but i am confused what would the answer be?
January 17, 2013

Science
no thats what i need help with!
January 17, 2013

Science
WHat would the fraction be Miss SUe
January 17, 2013

Science
Name a dormant volcano?
January 17, 2013

Science
WHat fraction of the earth is covered in water? Forgot my science book HELp
January 17, 2013

Science math
Thank you both very much.
January 7, 2013

Science math
Suppose a laboratory has a 38 g sample of polonium-210. The half-life of polonium-210 is about 138 days. How many half-lives of polonium-210 occur in 1104 days? How much polonium is in the sample 1104 days later?
January 7, 2013

math
The table below shows the rates for parking a car in a parking lot. According to the pattern shown in the table, how much would it cost to leave a car in the lot for 2 full days? ~TABLE~ 1 hour: $1.00 2 hours: $1.75 3 hours: $2.50 4 hours: $3.25 A. $36.00 B. $36.25 C. $36.50 D...
December 30, 2012

mathematics
1. If $ is defined for all positive numbers x and y by x$y = 3x + 8y - y^3, then 10$2 = A. 38 B. 102 C. 14 D. 20 2. If & is defined for all positive numbers w and z by w & z = 15wz - 10w + 2 then 3 & 4 = A. 67 B. 77 C. 142 D. 152 3. All of the following are in the domain of f(...
December 30, 2012

science
help on the moon
December 18, 2012

science
u have 2 make a cool rhyme.if u like rap then rap it.Trust me i learned that in 6th grade.Its really easy.
December 18, 2012

math
50
December 17, 2012

math
A student completed 44% on a test. He completed 22 question. Then how many questions are on the test
December 17, 2012

Genetics 7th
female is dominant
December 13, 2012

3rd grade language
circle when the word means your doing something ex:running/action/verb.
December 11, 2012

Pysics
A wooden bucket filled with water has a mass of 59 kg and is attached to a rope that is wound around a cylinder with a radius of 0.071 m. A crank with a turning radius of 0.29 m is attached to the end of the cylinder. What minimum force directed perpendicularly to the ...
December 7, 2012

Pysics
A mother and daughter are on a seesaw in the park. How far from the center must the 127 lb mother sit in order to balance the 49 lb daughter sitting 7 ft from the center?
December 7, 2012

Math
The difference between my digits is 7. When you divide me by the sum of my digits, the quotient is the sum of my digits. That makes me a perfect you know what! Which number am I?
December 4, 2012

Math
When you add the number of rows in my array to the number in each row, you get 15. My digits add up to 9. Which number am I?
December 4, 2012

Math
One of my factors is 5 more than another of my factors. My digits add up to 6. I am less than 50. Which number am I?
December 4, 2012

Math
If you count backward from me to divide me by 8, the sixth number you reach is 48. Which number am I?
December 4, 2012

Math
I am a perfect square that is 11 more than a perfect square and 13 less than a perfect square. Which number am I?
December 4, 2012

Math
I am divisible by four factors in addition to 1 and myself. I am 7 less than a number with a square array. I am less than 24. Which number am I?
December 4, 2012

Calculus
Consider a manufacturer whose total cost of producing x items is given by c(x)=10000+5x+1/9x^2. a. What is the average cost function A(x)= c(x)/x? b. How many items should the manufacturer produce in order to minimize average cost? c. What is the smallest average cost? d. Find...
December 4, 2012

Nutrition
What is the portion size of a #8 scoop?
November 27, 2012

physics
A tank of height H is filled with water and sits on the ground. Water squirts from a hole at a height y above the ground and has a range R. For two y values, 0 and H, R is zero. Determine the value of y for which the range will be a maximum. (Use any variable or symbol stated ...
November 27, 2012

Physics
What is the frequency of a sound wave in air at 20°C that has a wavelength of 0.4 m?
November 27, 2012

Physics
A 40,000 kg railroad car initially traveling at 10 m/s collides inelastically with a 20,000 kg railroad car intially at rest. The cars stick together. What is their final speed?
November 19, 2012

Physics
A 40,000 kg railroad car initially traveling at 10 m/s collides inelastically with a 20,000 kg railroad car intially at rest. The cars stick together. What is their final speed?
November 19, 2012

Physics
A 40,000 kg railroad car initially traveling at 10 m/s collides inelastically with a 20,000 kg railroad car intially at rest. The cars stick together. What is their final speed?
November 19, 2012

Physics
A crate with a mass of 40 kg is being dragged along a horizontal floor at a constant velocity by an applied force of 180 N. What is the coefficient of kinetic friction? (g = 10 m/s2
November 9, 2012

English/Literature
I have to write an essay, but I just need help with coming up with some ideas. In the essay, I have to compare/contrast the plays "Ajax" OR "Electra" (both are by Sophocles) with the "Iliad" (by Homer). I CANNOT mention similarities/differences in...
October 23, 2012

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