Questions Asked on
September 28, 2012

Chemistry
You are asked to prepare 500. mL of a 0.150 M acetate buffer at pH 5.00 using only pure acetic acid, 3.00 M NaOH, and water. Calculate the quantities needed for each of the following steps in the buffer preparation. 1. Add acetic acid to ~400 mL of water
asked by Kw1h 
chemistry
is IBr a hydrogen bonding or dipoledipole interactions or dispersion forces
asked by shay 
Chem
Calculate the number of C atoms in 0.185 C6H14O.
asked by Kim 
Biology
Which of the following statements correctly compares the functions of a plant's roots and stem? The stem contains a high percentage of cells that provide structural support, unlike the roots. The stem is the first part of the plant to emerge from a seed,
asked by Madi 
physics
A loaded truck can accelerate at 3.2 m/s^2 It loses its load so that it is only 0.2 as massive. By what factor must the acceleration change for the same driving force?
asked by michelle 
Physics
A ball is thrown toward a cliff of height h with a speed of 27m/s and an angle of 60 degrees above horizontal. It lands on the edge of the cliff 3.0s later. What is the height of the cliff? What is the maximum height of the ball? What is the ball's impact
asked by Nami 
Calc 3
Find parametric equations for the tangent line to the curve of intersection of the paraboloid z = x^2 + y^2 and the ellipsoid 6x^2 + 5y^2 + 7z^2 = 39 at the point (−1, 1, 2)
asked by Becky 
College Chemistry
calculate the moles of sulfuric acid that remained in the solution after reaction with the carbonate. the tared mass of carbonate is 1.5179g
asked by Anonymous 
math
maurice puts 130 trading cards in protector sheets. He fills 7 sheets and puts the remaining 4 cards in an eighth sheet. Each of the filled sheets has the same number of cards. How many cards are in each filled sheet?
asked by anthony 
math
65 men 75 women are enfolled in calculus. There are 30 business majors, 40 biology majors, 50 computer science majors, and 20 mathematics majors. No person has a double. If a single calculus student is chosen, find the probability that that the student is
asked by greg 
Economics
Which of the following firms caould raise prices and expect an increase in revenues? A)a firm product has an elasticity of 1 B)a firm whose product has an elasticity of 0.31 C)a firm whose product has an elasticity of 3.1 D)all firms regardless of the
asked by Katelyn 
10th Grade Literary Essay
What does F. Scott Fitzgerald suggest about the state of the American Dream, the people who pursue it, and the impact of that pursuit through his depiction of Jay Gatsby and the people in Gatsby’s life? Include specific examples, quotations, and
asked by Elizabeth 
CHEMISTRY
2C2H2+ 5O2> 4CO2+ 2H20. If 1 mole of C2H2 reacts with oxygen, how many moles of C02 are produced.
asked by ERIKA 
math dividing fractions
Julia ate 1 over 2 pint of mint ice cream. Mark ate 3 over 4 of malt ice cream. How many times more ice cream did mark eat?
asked by Aaliyah 
physics
A mass hangs on the end of a massless rope. The pendulum is held horizontal and released from rest. When the mass reaches the bottom of its path it is moving at a speed v = 2.3 m/s and the tension in the rope is T = 22.4 N. 1. What is the mass? 2. If the
asked by hater of physics 
Physical science.
A skydiver who jumps out of a plane that has a forward velocity of 40 m/s. That means that the skydiver has a forward velocity of 40m/s. Ignore the air resistance. The questions: What difference is there between the downward velocities of the skydiver who
asked by Hannah 
chemistry
If the boron nitride molecule,BN, were to form, what would its structure look like? pls. need help
asked by shay 
Physics
One kind of slingshot consists of a pocket that holds a pebble and is whirled on a circle of radius r. The pebble is released from the circle at the angle θ so that it will hit the target. The angle in the drawing is 35.5°. The distance to the target
asked by Eric 
Physics
An airplane whose air speed is 620km/h is supposed to fly in a straight path 35 degrees north of east. A steady 95km/h wind is blowing from the north. In what direction (angle) should the plane head?
asked by kacey 
Dynamics
The rotor is an amusement park ride where a person enters the Rotor when it is stationary and stands against the wall with their back against the wall. The rotor then begins to spin around a vertical axis. After reaching cruising speed, the floor drops
asked by Connor 
physics
Three charges are fixed to an xy coordinate system. A charge of +25C is on the y axis at y = +2.7 m. A charge of 16C is at the origin. Lastly, a charge of +66C is on the x axis at x = +2.7 m. Determine (a) the magnitude and (b) direction of the net
asked by John 
Physics
An arrow is shot at an angle of above the horizontal. The arrow hits a tree at an angle 45 degrees horizontal distance D = 220 away, at the same height above the ground as it was shot. Use g = 9.8 for the magnitude of the acceleration due to gravity. Find
asked by Nami 
chemistry
Determine the pH of a solution containing 0.045 M NaOH and 0.025 M KI: With activities: Without activities:
asked by amanda1012 
Science
On a winter day the temperature drops from –15°C to –25°C overnight. If a pan sitting outside contains 0.40 kg of ice, how much heat is removed from the ice for this temperature change?
asked by KeKe 
physics
A mass m = 11.0 kg rests on a frictionless table and accelerated by a spring with spring constant k = 4979.0 N/m. The floor is frictionless except for a rough patch. For this rough path, the coefficient of friction is μk = 0.46. The mass leaves the spring
asked by hater of physics 
physics
A bicycle wheel of radius 0.4 m is spinning at a rate of 40 revolutions per minute. What is the centripetal acceleration of a point on the edge of the wheel? What is the period of the wheel's motion?
asked by phil 
math
Each divisor was divided into another polynomial , resulting in the given quotient and remainder. Find the other polynomial the dividend Divisor: x+10,quotient,x^26x+10,remainder :1 I am so confused help is appreciated
asked by jezebel 
physics
A painter of mass 90.0 kg stands on a platform of mass 50.0 kg and pulls on two ropes which hang over pulleys, as shown. He pulls each rope with a force of 600.0 N. Assuming a coordinate system where +y is up, calculate the ycomponent of the acceleration
asked by shyne 
physics
.A 5.5kg riffle fires an 11gram bullet with a velocity of 1000m/s. a. find the velocity of a riffle? b. if the shooter holds the riffle firmly with his shoulder what will be the velocity assume the mass of shooter is 120kg?
asked by mark 
psychology
Should the criminal justice system put as much emphasis as it does on eyewitness testimony? What are some possible circumstances that could influence eyewitnesses to say they saw something they might not really have seen?
asked by halasha 
physics
A mass m = 76.0 kg slides on a frictionless track that has a drop, followed by a looptheloop with radius R = 19.7 m and finally a flat straight section at the same height as the center of the loop (19.7 m off the ground). Since the mass would not make it
asked by Anonymous 
math
Each dividend was divided by another polynomial, resulting in the given quotient and remainder. Find the divisor Divided:5x^3+x^2+3 ,quotient:5x^214x+42, remainder:123
asked by Melissa 
Chemistry Pretest
Fe can be prepared as 2 Al + Fe2O3 > 2 Fe + Al2O3. Suppose that 0.450 moles of Fe2O3 are reacted with an excess of Al. Suppose that 43.6 grams of Fe are obtained. What is the percent yield of Fe? a) 16.2% b) 60.7% c) 86.7% d) 43.4% Percent yield=
asked by Sarah 
Business
Which of the following is typically included in a stock listing? The company's SEC registration credentials The predicted price of the stock over the next year The number of shares of stock sold in a previous day The number of shares of stock sold in the
asked by Max 
physics
A skier is pulled up a slope at a constant velocity by a tow bar. The slope is inclined at 22.2° with respect to the horizontal. The force applied to the skier by the tow bar is parallel to the slope. The skier's mass is 56.0 kg, and the coefficient of
asked by shyne 
7th grade math standard form scientific notation
In standard form: 5. 3.2 x 10^3 7. 4.1 x 10^8 9. Write the average weight of a blue whale, 2.6 x 10^5, in standard form. 15. 2.5 x 10^3 17. 1.05 x 10^2 19. Write the size of a grain of very fine sand, about 9.35 x 10^3 cm, in standard form. Can somebody
asked by Delilah 
physics
A mass hangs on the end of a massless rope. The pendulum is held horizontal and released from rest. When the mass reaches the bottom of its path it is moving at a speed v = 2.3 m/s and the tension in the rope is T = 22.4 N. Now a peg is placed 4/5 of the
asked by hater of physics 
physics
The forces in the figure below are acting on a 2.1 kg object. Find the values of ax and ay, the x and y components of the acceleration. i.imgur. com/nNz9m. png this is one of the last problems on my homework that i just do not understand.. can someone
asked by kev 
Math
The inclined ramp of the boat launch is 18 meters longer than the rise of the ramp. The run is 17 meters longer than the rise. How long are the three sides of the ramp?
asked by Mark 
physics
A horizontal rifle is fired at a bull'seye. The muzzle speed of the bullet is 692 m/s. The barrel is pointed directly at the center of the bull'seye, but the bullet strikes the target 0.0239 m below the center. What is the horizontal distance between the
asked by shyne 
math
The winner in a recent Los Angeles Marathon ran the 26mile race in 2.23 hours. How many yards per minute did he run?
asked by michael 
physics
Figure 1823 shows three linear temperature scales, with the freezing and boiling points of water indicated.
asked by Anonymous 
Physics
On a playground slide, a child has potential energy that decreases by 1000 \rm J while her kinetic energy increases by 900 \rm J. What other form of energy is involved, and how much?
asked by Tanya 
Math
Pool tables are rectangular, and their length is twice the width. Find the dimensions of a pool table if it occupies 162 ft2 of floor space
asked by Tiff 
7th grade math questions Scientific Notation
19. Write the size of a grain of very fine sand, about 9.35 x 10^2 cm, in standard form. 31. The population of the US is expected to be 392 million people by 2050. Write this answer in scientific notation. 37. Write 10^29  10^28 in scientific notation.
asked by Delilah 
Wine Chemistry
Is citric acid stronger than tartaric acid?
asked by Rachel 
7th grade science weather
1. Relative humidity is a measure of the amount of _______ that air is holding compared to the amount needed for saturation at a specific temperature. water vapor particles heat none of the above 2. Low, layered gray clouds that produce light precipitation
asked by Delilah 
physics
A mass m = 76.0 kg slides on a frictionless track that has a drop, followed by a looptheloop with radius R = 19.7 m and finally a flat straight section at the same height as the center of the loop (19.7 m off the ground). Since the mass would not make it
asked by Anonymous 
physics
an archer at the edge of a cliff fires an arrow from a height of 14.6 m above the ground at the bottom of the cliff. the arrow just clears a rock on a pillar that is 21.7 m above the gound which is 45.2 m horizontally away from the archer.determine a,the
asked by Anonymous 
Chemistry Pretest
Last and final question: Consider the reaction 2KNO3 + 10K > 6K2O + N2. If 155 grams of K reacted with 122 grams of KNO3, what is the limiting reagent? a) KNO3 b) K c) Neither d) not enough information I would think it's d? Because it doesn't ask to
asked by Sarah 
physics
Im trying to study for my physics exam by doing some extra problems, however im stuck with this one. any help is much appreciated Two tiny spheres have the same mass and carry charges of the same magnitude. The mass of each sphere is 4.62 x 106 kg. The
asked by John 
English
In the first stanza the narrators bed is compared to a womb and a
asked by Anonymous 
Math
A catcher's and a pitcher's uniform numbers are consecutive integers whose product is 756. If the catcher's was the smaller number, determine the uniform number of each player.
asked by Tiff 
Math HELPPPP
(a) Which of the following are examples of the expression "difference of two cubes"? (Select all that apply.) (y2  9)3 3  4y 64  y3 (y  1)3 y3  27 27  3y y3 (b) Which of the following are examples of the expression "cube of a difference"? (Select all
asked by Mark 
PreCalculus
Two sides of a triangle are x units and y units in length. The angle between them is theta. Prove that the area of the triangle is 1/2xysin(theta). I'm not sure how to do this question, I tried drawing a picture but I'm still not understanding it.
asked by Tyson 
physics
an archer at the edge of a cliff fires an arrow from a height of 14.6 m above the ground at the bottom of the cliff. the arrow just clears a rock on a pillar that is 21.7 m above the gound which is 45.2 m horizontally away from the archer.determine a,the
asked by Anonymous 
Maths
How to do factorise ? What is Factorise ? Give me some examples ,please . Thank you !
asked by Kim 
Chemistry Pretest
1. What mass of the compound FeWO4 contains 50.0 grams of tungsten (atomic symbol W, atomic number= 74)? **Formula mass of FeWO4 is 303.69** a) 30.0 g FeWO4 b) 304 g FeWO4 c) 82.6 g FeWO4 d) 188 g FeWO4
asked by Sarah 
Physics
An arrow is shot at an angle of above the horizontal. The arrow hits a tree at an angle 45 degrees horizontal distance D = 220 away, at the same height above the ground as it was shot. Use g = 9.8 for the magnitude of the acceleration due to gravity.
asked by Nami 
Physics
Two charges are placed on the x axis. One of the charges (q1 = +8.71C) is at x1 = +3.00 cm and the other (q2 = 28.6C) is at x2 = +9.00 cm. Find the net electric field (magnitude and direction given as a plus or minus sign) at (a) x = 0 cm and (b) x =
asked by Alex 
7th grade scientific notation help Ms. Sue
Write each number in scientific notation. 1. 4,800 2. 17, 200 3. 180,000 4. 343, 502 12. 0.00581 13. 0.00105 14. 0.0000078 15. 0.000027 16. 0.000000132 17. 0.000000009
asked by Delilah 
science
it dorsn't give me a stage in the second stage, some animals just grow larger.Other change in___________
asked by tommy 
ICD9
All ICD9Cm Codes must be supported by: A. Nonessential modifiers. B. physician documentation in the medical record. C. V codes. D. another diagnostic code.
asked by Patty 
Algebra
An investor invested a total of $2000 in two mutual funds. One fund earned 9% profit while the other earned a 6% profit. If the investor's total profit was $129, how much was invested in each mutual fund?
asked by Nixie 
7th grade art
1. The ingredients, or building blocks, of an artwork (1 point) studies of art principles of art categories of art elements of art 2. The name of a color (1 point) value intensity hue fue 3. The arrangement of hues in a circular format (1 point) color
asked by Delilah 
chemistry
N2+ 3H2 GIVES 2NH3 = 90.5 4NH3+5O2 GIVES 4NO+6H20 =905.1 H2 +0.5 O2 GIVES H2O =241.1 USE THESE VALUES TO DETERMINE ENTHALPHY CHANGES
asked by Meenakshi 
sixth grade math
Which shape does not have two pairs of parallel sides? A. rectangle B. square C. parallelogram D. trapezoid
asked by luv history 
Chemistry Pretest
11. How many moles of CO2 would be produced from 56 moles of O2 according to the following balanced equation? 2 C2H6 + 7 O2 > 4 CO2 = 6 H20 a) 16 b) 32 c) 224 d) 48 e) 8
asked by Sarah 
physical science
explain why elements in a group on the periodic table have similar chemical properties?
asked by jake 
Earth Science
Can someone five me an example of how carbon cycles through the Earth's system?
asked by Matt 
college physics
Two charges are placed on the x axis. One of the charges (q1 = +8.71C) is at x1 = +3.00 cm and the other (q2 = 28.6C) is at x2 = +9.00 cm. Find the net electric field (magnitude and direction given as a plus or minus sign) at (a) x = 0 cm and (b) x =
asked by Alex 
American Gov
2. Members of the Senate were originally chosen by the House of Representatives True? 7. Which of the following does not serve to limit the power of the federal government? a. Tenth Amendment b. voting rights c. state legislators d. Bill of Rights C?
asked by mysterychicken 
statistics
The average temperature in households is 67.6 degrees F. The standard deviation is 4.2 degrees F. A random sample of 51 households is to be selected What is the probability that the average of this sample will be within 1.4 STANDARD ERRORS of the
asked by Kristin 
Math
The length of the luff is four times longer than the length of the foot of the sail. Find the length of the foot and the length of the luff.
asked by Tiff 
Quantitative Chemical Analysis
assume an unknown sample to be 15% copper, weigh enough dried ore sample to use approximatele 3545mL of .09M S2O3. How many grams do I need to measure out to use 40.00mL of the thiosulfate solution?
asked by Jill 
7th grade science Ms. Sue please help if you can
1. Violent storms generally form along _____. (1 point) occluded fronts cold fronts warm fronts stationary fronts 2. Areas of low pressure usually have _____. (1 point) cloudy weather good weather descending air none of the above 5. Tornadoes can form when
asked by Delilah 
social studies
Which one of the following U.S. motherstobe is least likely to receive prenatal care? A. Maria, a Puerto Rican teenager B. Gladys, an African American woman C. Ayiana, a Native American teenager D. Susan, a white woman I am saying A. But Im not sure
asked by phia 
assessing development cognitive language observat
There are several strategies that can help preschool children Foster language production one strategy that involves asking questions after a child. speaks to encourage him or her to continue talking is called?
asked by James 
Psychology
If the concept is truck, the prototype might be: A. A ford pick up B. bulldozer C. An eighteenwheeler D. Personnel carrier
asked by Sharon 
Chemistry Pretest
Consider the following balanced equation. 2 H2 + O2 > 2 H2O Which of the following statements is false? a) One molecule of O2 will react with 2 molecules of H2 b) One mole of O2 will react with 2 moles of H2 c) The complete reaction of 32.0 g of O2 will
asked by Sarah 
Math
Find the smallest positive integer d such that d=105m+216n, where m & n are integers.
asked by Anonymous 
Math
What multiplies together to make 300cm3 (volume)
asked by Rose 
Math
A standard basketball has a diameter of 9 9/16 inches (that is 9 inches and 9/16 of an inch). What sit he volume of air in the basketball?
asked by Alisa 
grammar
He was arrested and, despite being in handcuffs, managed to escape from custody.
asked by Anonymous 
Math
44% off of $158
asked by Valentina 
Critical Thinking/Ethics
why is calling people listed in the phone book to conduct a survey, biased?
asked by Steph 
physics
A car of mass m = 1635 kg is pushed off a cliff of height h = 23 m. If the car lands a distance of 9 m from the base of the cliff, what was the kinetic energy of the car the instant after it left the cliff?
asked by Dani 
science
In the second stage, some animals just grow large. Ohters change in 
asked by tommy 
7th grade math check my answers please quick
11. 17, 200 written in scientific notation is 1.7 x 10^5 21. 0.00105 written in scientific notation is 1.05 x 10^3 are these correct?
asked by Delilah 
Math
At the peak of a roller coaster ride, a rider's sunglasses fly off his head. The height h (in feet) of the glasses, t seconds after he loses them, is given by h = 16t2 + 16t + 1152. After how many seconds will the glasses hit the ground?
asked by Mark 
Math
Before a football game, a coin toss is used to determine which team will kick off. The height h (in feet) of a coin above the ground t seconds after being flipped up into the air is given by the following equation. h = 16t2 + 34t + 15. How long does a
asked by Mark 
7th grade math NASA problem
5. NASA's apollo program lasted nine years (19631972) and included 6 moon landings. Write the cost of the Apollo project, $25,000,000,000, in scientific notation. Is the answer 2.5 x 10^10????
asked by Delilah 
elementary school math
Which of the following symbols could you use to complete this number sentence? Explain your reasoning. .= + < #  > 7,000+800+9. 7,000+900+8
asked by stephanie 
Chemistry
In industrial plants, what specific type of oil is used as heating medium?
asked by Namie 
College Chemistry
calculate the average volume of sodium hydroxide required for the titration of 25.00mL of the standard sulfuric acid solution. From my data i have trial 1 and 2 to be 19.80ml and 19.80ml of NaOH used so do i just add them and divide it by two to get the
asked by Anonymous 
math
what are the bars around the numbers in integer questions
asked by bracken 
Sociology/Psychology
I'm taking Sociology 1st semester and Psychology 2nd semester when I go to the 9th grade. I'm just curious but is there any topics (interesting ones) in Sociology and Psychology.
asked by Laruen 
7th grade language arts
Choose the demonstrative pronoun is the following sentence: "This invitation fell out of her backpack." her of backpack this
asked by Delilah 
physics
The mass of the heavier block is 28 kg and the mass of the lighter blocks is 14 kg and the magnitude of the force of the connecting string on the smaller block is 24 N. Assume: g = 9.8 m/s^2 and the horizontal surface on which the objects slide is
asked by michelle 
Chemistry
How would I find the volume of 30% hydrogen peroxide solution from 20mL of 3% hydrogen peroxide solution?
asked by Zach 
science
machine fires 5 bullets per sec each of velocity 200m/sec. find power of the gun.
asked by spandana 
Precalculus
give an example of two decreasing functions whose product is increasing
asked by fatima 
Physics
A 2kg block is released from rest at position A and falls 12 meters to the floor. At position B, just before it lands, it is falling at 15m/s. a) if the blocks potential energy is zero at B, what is its potential energy at A?
asked by John 
ODU
FIND THE EXACT VALUE OF COS U 4/5, PI/2
asked by TINA 
understanding observation behavior
Which of the following method depends on heavily on the observers memory.
asked by James 
English
Should students be allowed to invade established neighborhoods and live in unlicensed and unsafe rooming houses? How can I rewrite the above question so it is not biased?
asked by Jessica 
7th grade social studies
Explain the quote by Samuel de Champlain in your own words. "Through (exploration) we gain knowledge of different countries, regions and kingdoms; through it we attract and bring into our countries all kinds of riches; through it... Christianity (is
asked by Aisha 
Math
Factor. y ^3 + 729
asked by Mark 
social studies
The number of multiple births (twins, triplets, etc.) has grown rapidly in the United States since 1980. The main reason for this increase is that: A. studies show that people are having more frequent intercourse. B. less frequent intercourse has resulted
asked by phia 
Algebra 2
[(x^2+2x15)/(x^24x45)] / [(x^2+x12)/(x^25x36)]
asked by Anonymous 
arithmetic
If the average of a and b is 10 and a^2  b^2 = 80, what is the value of b?
asked by Anonymous 
probl;em solving
in harry's attic there are three spider webs. the first web is twice as large as the second web. gthe third web is 3 inches larger than the first web. the combined width of the three webs is 1 foot and 6 inches. how long is each web?
asked by Anonymous 
assessing development cognitive language observat
When preschool child is first learning to print. alphabet letters he or she print letters upside down or backwards the teacher should.
asked by James 
trig
i have to draw a flat unit circle all the way to 4 pi in radians. i can get to 2 pi but i have trouble finding the radians if i went one more time around the unit circle.
asked by sally 
Chemistry
a solution is 0.0300 m in Sodium. How many grams of sodium carbonate are necessary to prepare 900.0 ml of this solution? I don't know where to start on this.
asked by Alex 
Physics
a 150N and 80N force act upon an object. the angle between the two forces is 55 degrees. determine the magnitude and direction by trigonometric calculations.
asked by helena 
Social studies
I have this poem I have to write it's about Walter prynne and the freedom of speech has to be ten lines and has to be rhyme scheme poem. I don't know how to do this. And my teacher said it's due and I don't get it and if I don't get it in I fail. Pls reply
asked by Annoymous 
PreCalculus
Two sides of a triangle are x units and y units in length. The angle between them is theta. Prove that the area of the triangle is 1/2xysin(theta). I'm not sure how to do this question, I tried drawing a picture but I'm still not understanding it.
asked by Tyson 
math
twelve less than a number is 19. what is the number?
asked by sammy 
English III
how would you use the allusion "Manna" in a sentence?
asked by Claire 
maths
a hyperbola of eccentricity 3/2 has one focus at (1,3). The corresponding directrix is the line "y". find an equation for the hyperbola?
asked by ahmadafnan 
english
a good thesis statement on why teachers should have the authority to remove disruptive students from their classes permanently.
asked by kristin 
math
How many grams of a drug are contained in 1L of a 30% solution?
asked by Anonymous 
Earth Science
Does energy flows through the Earth's system by heat?
asked by Matt 
ECO 372
How does a stimulus program (through the money multiplier) affect the money supply?
asked by Ashley