Saturday
August 23, 2014

Posts by andrew


Total # Posts: 960

physics
an object is initially moving 15.0 m/s. a minute later, it is moving 25.0 m/s in the opposite direction. What is the displacement and acceleration?
October 31, 2010

Math Help Please
x=4.4
October 28, 2010

chem 101
using the unit conversion method derive an equation to calculate heat produced from the HCl-Na OH reaction
October 26, 2010

6th grade
What are the two similar features for long shore current and rip currents?
October 26, 2010

chem 101
how many grams of oxalic acid dihydrate to completely neutralize 25ml of 0.12 M of sodium hydroxide
October 18, 2010

physics
the string off of A
October 8, 2010

physics
no its on a flat surface with the static friction of .25. and W is hanging off the string at a 45 degree angle vertically.
October 8, 2010

physics
(a)block A weigh 60N. the coefficient of static friction between the block and the surface on which it rests is 0.25. the weight W is 12N and the system is at equilibrium. find the friction force exerted on block A. (b)find the maximum weight W for which the system will remain...
October 8, 2010

us history
Since the Constitution has been ratified, how many states have been admitted to the union?
October 8, 2010

physics
An elevator and its load have a combined mass of 1700 kg. Find the tension in the supporting cable when the elevator, originally moving downward at 13 m/s, is brought to rest with constant acceleration in a distance of 43 m.
October 7, 2010

physics
i have plugged in all the numbers and got .51 what do i do at this point???
October 5, 2010

physics
A block is hung by a string from the inside roof of a van. When the van goes straight ahead at a speed of 26 m/s, the block hangs vertically down. But when the van maintains this same speed around an unbanked curve (radius = 135 m), the block swings toward the outside of the ...
October 5, 2010

PHYSICS
thanks for the detailed explanation
October 5, 2010

chemistry
HBr is a molecular substance that is a strong acid in water. Write an equation for its ionization in water. Use minimal integer numbers to balance the reaction. Include physical states in your answer, e.g., start with HBr(l).
October 4, 2010

Chemistry
0.01L KHP * 0.445M KHP = 0.00445 molKHP KHP and NaOH are in 1 to 1 ratio so, moles NaOH = 0.00445 so, 0.00445mol NaOH/ 0.01154L NaOH = 0.386M NaOH
October 4, 2010

Physics
Ok thanks.
October 4, 2010

Physics
A bicycle wheel that initially spins at 3 revolutions per second is braked uniformly to a stop in 1 second. A spot is painted at the outer edge of the wheel. How many revolutions does the spot go during the time it takes the wheel to stop? The answer I got was 0.5 but was ...
October 4, 2010

math
What is the naming convention for a vector when two arrow point outward from a central point?
September 21, 2010

PHYSICS
F=Ma M =79kg a= 9.8ms^-2 (gravity) There is no other acceleration component since the aeroplane is at constant velocity so Force on pilot is... 79 x 9.8 = 774.2 N
September 21, 2010

Algebra
Sorry didn't see your second answer, great thanks a lot.
September 17, 2010

Algebra
I understand, your answer never mind. Thanks :)
September 17, 2010

Algebra
sorry don't understand
September 17, 2010

Algebra
100^0 one hundred to the zero power, would it be zero or one hundred?
September 17, 2010

math
32.5 - 45.8 please show steps!
September 17, 2010

math
x/7+5=10
September 17, 2010

physics
The left ventricle of the heart accelerates blood from rest to a velocity of +26 cm/s. (a) If the displacement of the blood during the acceleration is +1.9 cm, determine its acceleration (in cm/s2). (b) How much time does it take for the blood to reach its final velocity?
September 9, 2010

physics
The left ventricle of the heart accelerates blood from rest to a velocity of +23 cm/s. (a) If the displacement of the blood during the acceleration is +2.1 cm, determine its acceleration (in cm/s2). (b) How much time does blood take to reach its final velocity? in seconds
September 7, 2010

physics
A jetliner, traveling northward, is landing with a speed of 65 m/s. Once the jet touches down, it has 785 m of runway in which to reduce its speed to 5.0 m/s. Compute the average acceleration (magnitude and direction) of the plane during landing (take the positive direction to...
September 7, 2010

algebra
look at the algebraic equation that u posted previously. try to form an equation similar to that.
September 5, 2010

algebra 1
1. find a common multiple for the denominators of both fractions. 2. combine the fractions together. do not expand the numerator first. 3. cross multiply. 4. expand the terms 5. make x the subject. 6. solve.
September 5, 2010

Physics - Circular motion
A marble of mass m is placed on top of a bowling ball of radius r and allowed to roll from rest. derive the angle from centre of circle at which the marble loses contact with bowling ball. assume there is no friction between marble and bowling ball.
September 5, 2010

3rd grade
I am a number greater than 99 and less than 1,000. Two of my digits that aren't next to each other are the same. My tens digit could not be greater and it is 1 more than my hundreds digit. What number am I?
August 30, 2010

conversion problems
I don' know ask google
August 25, 2010

Math
What if the height of the water is only 15 cm, half the height of the hemisphere?
August 19, 2010

Physics (Static Friction)
divide by a 1000 your original answer is in N i believe also i would like to know how you solved this
July 28, 2010

British Literature
1. a 2. d 3. c 4. b 5. a 6. b 7. d 8. a 9. c i don't feel like doing any more. stop being so lazy
July 21, 2010

MATHS
to get the average do i add them all up and divide by the number of obsevations? say maths 646 divided by 14 = 46.1428 science 598 divided by 14 = 42.714 thanks
July 19, 2010

MATHS
oops sorry forgot the rest of the info: 14 students and their scores: MATHS 28 35 37 50 69 84 40 65 29 42 51 45 31 40 science 45 39 39 61 64 88 31 55 57 45 71 73 33 52 these are a random sample...... so if the kid gets 58 in maths how do you work out what his prdicted score ...
July 19, 2010

MATHS
if a student scores 58 in a maths exam predict the score they would get in science??? Have no idea where to start on this answer other than having a good guess!! Can anyone help please??? Thanks Andrew
July 19, 2010

Math
What is 34920421-98349238
July 14, 2010

Physics HELP
C)
July 14, 2010

FINANCE
1 million bottles at $1 a bottle is $1 million minus 50 cents a bottle is $500,000 minus $200,000 fixed costs per year is $300,000 minus $150,000 in taxes is $150,000 left plus 10% per year from the bank is $165,000 times 5 years is $825,000 made. I would do it.
July 14, 2010

math
Factor the expression: x to the 2nd power+3x+2?
July 13, 2010

chemistry
124 atm
July 7, 2010

Chem
f the molecular mass for a chemical is 352.04 g/mol and the enthalpy of formation is -2137 kJ/mol, the heat change will be ______ kJ when 10.0 g of this chemical is formed.
May 17, 2010

Chem
f the molecular mass for a chemical is 352.04 g/mol and the enthalpy of formation is -2137 kJ/mol, the heat change will be kJ when 10.0 g of this chemical is formed.
May 17, 2010

Math
Square Root of 5 plus 2 Square root of 2 over 4 minus the square root of 5 simplify
May 12, 2010

8th grade social studies
which of the followin is a power of the president???
May 10, 2010

algebra 2
What is the Domain and Range of the Radical Parent function
May 8, 2010

algebra 2
What is the Domain and Range of the Radical Parent function
May 8, 2010

Technology
I'm writing an essay, and the first page is a cover page. Obviously, there shouldn't be a number there. How do I get rid of it so that there's still numbers on the other pages?
May 4, 2010

Chemistry
Is it possible to determine the Ka of a weak acid at points other than the halfway point of a titration? Explain.
May 3, 2010

Chemistry
Find the pH experimentaly .1 ml before and .1 ml after the equivalence point if the experimental equivalence point was found to be at 35 ml. In this titration, you are titrating 0.500 M NaOH with 0.250 M HCl.
May 2, 2010

Chemistry
How do you solve for the experimental pKa when doing a titration?
May 2, 2010

Chemistry
If you have 0.100 M Pyridine titrated with 0.100 M HCl, choose an appropriate indicator and explain?
May 2, 2010

Algebra 2
Find the solution of the exponential form in terms of logarithms 2^(2x+13) = 3^(x-45)
April 30, 2010

Math
find the solution of the expontetial equation 1+7^(5x)=19
April 30, 2010

English
We were eating apples, bananas, and watermelon on Tuesday.
April 29, 2010

Geography
I was wondering if a plane flew west and kept flying, would it be possible for it to never fly into night if it didn't stop?
April 19, 2010

english
how do sonnets compare with modern day music and songs? its for a presentation
April 16, 2010

Biology
aerobic respiration?
April 7, 2010

Chemistry
If there were two solutions- one with areagent(100% pure) mixed in water and the other solution containing the same reagent (99.9% pure) mixed in equal volume of water. How significant would the difference in concentration be between these two solutions?
March 29, 2010

Physics
Hey I'm lost on this physics problem can anyone tell me which equations i'm suppose to use in these questions a) A skier inhales a breath of air at Temp-air = 3.9 ¢XC and exhales it as Volume-air = 1.92 liters of air at Temp-body = 37 ¢XC and atmospheric ...
March 27, 2010

CHEMISTRY
WHAT FACTORS ARE CONSIDERED TO BE STRESSES ON AN EQUILIBRIUM SYSTEM
March 26, 2010

Physics
1a. Two converging lenses, each of focal length 14.4 cm, are placed 60.6 cm apart, and an object is placed 26.9 cm in front of the first. Where is the final image relative to the second lens formed? b. What is the magnification of the system?
March 23, 2010

Math
What rate would it take to double an object valued currently at $100 in 6 years? I would like to know the answer and the equation/steps taken to solve the problem.
March 23, 2010

Nutrition
Why do sucrose-fed rats (high carb diet) consume less rat chow (protein, fat, fiber) than the control rats?
March 21, 2010

Chemistry
Determine the volume of a 0.550 M KMnO4 solution required to completely react with 2.55 g of Zn.
March 19, 2010

7th grade
37.5
March 18, 2010

math
What is the probability that exactly three children in a family of five children will be boys? Assume that P(boy)=P(girl)
March 9, 2010

Volume of a rectangular prism
Thanks. Therefore, the answer is 512. 2 x 16 x 2 = 64 4 x 32 x 4 = 512 Appreciate your help, Andrew
March 1, 2010

Volume of a rectangular prism
Hello, if the volume of a rectangular prism is LWH = 64 cubic inches, what are the dimensions of a rectangular prism with dimensions twice as long? Thank you!
March 1, 2010

science
Explain the similarities and differences of the multicellular stages of acellular and cellular slime molds.?
February 27, 2010

MATH
f(x)= 3x+9/(x^2-100) If this function has a horizontal asymptote, give its y-value Find the x-intercept(s). Find the y-intercept
February 24, 2010

ENGLISH
CAN SOMEONE HELP ME WITH WRITING AN EPIC POEM ABOUT A HERO? MY ASSIGNMENT IS DUE MAR. 1. IT HAS TO BE 4 PAGES LONG.
February 24, 2010

Physics
Suppose the coefficient of static friction between the road and the tires on a car is 0.60 and the car has no negative lift. What speed will put the car on the verge of sliding as it rounds a level curve of 29.3 m radius?
February 18, 2010

Physics
What is the smallest radius of an unbanked (flat) track around which a bicyclist can travel if her speed is 35 km/h and the μs between tires and track is 0.35?
February 18, 2010

chemistry
You are asked to prepare 150.0 mL of 3.15×10−2 M AgNO3. 2.) An aqueous solution is 6.40% methanol CH3OH by mass, with d = 0.988 g/mL} What is the molarity of CH3OHOH} in this solution?
February 16, 2010

chemistry
thank you
February 16, 2010

chemistry
1.)How many grams would you need of a sample known to be 99.81% AgN03 by mass? You are asked to prepare 150.0 mL of 3.15×10−2 M AgNO3. 2.) An aqueous solution is 6.40% methanol CH3OH by mass, with d = 0.988 g/mL} What is the molarity of CH3OHOH} in this solution?
February 16, 2010

chemistry
1.)How many grams would you need of a sample known to be 99.81% AgN03 by mass? You are asked to prepare 150.0 mL of 3.15×10−2 M AgNO3. 2.) An aqueous solution is 6.40% methanol CH3OH by mass, with d = 0.988 g/mL} What is the molarity of CH3OHOH} in this solution?
February 16, 2010

chemistry
2.) How much heat must be absorbed at 1357 K to melt a bar of copper (80 * 10 * 12 cm) assume d = 8.93 g/cm^3. The normal boiling point is 1357 K, and heat of fusion is 13.05 KJ/mol.
February 15, 2010

chemistry
How much heat, in kilojoules, is evolved when a 3.70 kg sample of molten Cu freezes? The normal boiling point is 1357 K, and heat of fusion is 13.05 KJ/mol. 2.) How much heat must be absorbed at 1357 K to melt a bar of copper (80 * 10 * 12 cm) assume d = 8.93 g/cm^3.
February 15, 2010

chemistry
How much heat, in kilojoules, is evolved when a 3.70 kg sample of molten Cu freezes? The normal boiling point is 1357 K, and heat of fusion is 13.05 KJ/mol. 2.) How much heat must be absorbed at 1357 K to melt a bar of copper (80 * 10 * 12 cm) assume d = 8.93 g/cm^3.
February 15, 2010

AP Chemistry
The combustion of 1.00 mol of sucrose,C12H22,O11, evolves 5650 kJ of heat. A bomb calorimeter has a calibrated heat capacity of 1.23 kj/degree Celsius. How many grams of sucrose should be burned to raise the temperature of the calorimeter and its contents from 23 degrees C to ...
February 15, 2010

Philosophy
What fallacies, if any, are present in the following passage? Can you please give reasons for your answer, that is, if you say that a fallacy has been committed, then show where the fallacy occurred, and explain why you think it is a fallacy? The following is the paragraph. ...
February 12, 2010

Physics (2)
Consider a charged ring of radius 43.4 cm and total charge 18 nC. We are interested in the electric field a perpendicular distance z away from the center of the ring. At what distance from the center of the ring does the electric field become maximum ..so E=kQ/(x^2)at a ...
February 11, 2010

Physics
Consider a charged ring of radius 43.4 cm and total charge 18 nC. We are interested in the electric field a perpendicular distance z away from the center of the ring. At what distance from the center of the ring does the electric field become maximum?
February 11, 2010

Calculus
how did you get the 8cm?
January 31, 2010

Social Studies
One of the biggest reasons for the increased European agricultural production in the medieval period was? A) the introduction of a heavier plow. B) the official support of the serfs by the popes. C) the introduction of new crops from the Byzantine world. D) the money invested ...
January 25, 2010

Social Studies
One of the biggest reasons for the increased European agricultural production in the medieval period was? A) the introduction of a heavier plow. B) the official support of the serfs by the popes. C) the introduction of new crops from the Byzantine world. D) the money invested ...
January 25, 2010

algebra
janice noticed that the number of problems she did for homework (x) formed a linear relationship with her quiz score (y). When she did 3 problems she earned a 25% and when she did 8 problems she earned a 60%. Write an equation to represent this situation.
January 20, 2010

physics
A ball is thrown up with a speed of 30m/s, what is the maximum height reached?
January 20, 2010

4th grade math
how do you find 3 equivalent fractions for 4/9??
January 19, 2010

ENGLISH-POETRY
NEED HELP WITH WRITING A 10 LINE IAMBIC POEM ABOUT WEATHER AND A 10 LINE TROCHIAC POEM ABOUT A PET
January 11, 2010

Physics
A 2 kg mass on a horizontal friction-free air track is accelerated by a string attached to a 100 kg mass hanging vertically from a pulley as shown. Compare the accelerations when the masses are interchanged, that is, for the case where the 100 kg mass dangles over the pulley, ...
January 9, 2010

Biology
Where do tertiary base pair interactions largely map onto the three-dimensional structure of tRNA? What is their purpose?
December 17, 2009

Biology
Devise an experiment, based on sucrose gradient sedimentation, that would demonstrate that proteins are synthesized on polyribosomes.
December 17, 2009

Biology
What is the difference between enterocolitis and gastroenteritis?
December 11, 2009

physics
A person standing at the edge of a seaside cliff kicks a stone over the edge with a speed of vi = 11 m/s. The cliff is h = 55 m above the water's surface, as shown below. How long does it take for the stone to fall to the water?
December 9, 2009

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