Friday
October 24, 2014

Posts by Sarah


Total # Posts: 4,209

Early Childhood Education
To promote creativity in the classroom curriculum, a teacher should A. follow precise, preplanned steps B. provide materials that allow children to explore. I selected B, am I correct
May 31, 2012

dressmaking
Sometimes a person's sloping shoulders cause a garment to sag with diagonal wrinkles from the neck end of the shoulder seam to the armhole.To correct this,ripping out the sleeve and then doing which of the following is correct: A)Rip the soulder seam from the center to the...
May 29, 2012

math (please double check my answers)
x 2 - 4 for x = 5
May 27, 2012

Algebra II
(7 − 2) ÷ 5=
May 25, 2012

dressmaking
1)What sewing method should be used to attach a row of two mettalic threads around the wrist of a dress made of voile A)Trapunto B)Fagoting C)Couching D)smocking Im looking at either C or D 2)If you want to attach curved lines of beads,you can either apply each bead singly or ...
May 23, 2012

physics
For long range communication an elephant uses a low frequency rumble that is undetectable to human ears. One elephant can pick up another elephant's call from a distance of 10 km. The frequency of this rumble is about 13 Hz. How fast does the rumble travel?
May 22, 2012

physics
For long range communication an elephant uses a low frequency rumble that is undetectable to human ears. One elephant can pick up another elephant's call from a distance of 10 km. The frequency of this rumble is about 13 Hz. How fast does the rumble travel?
May 22, 2012

chemistry
Thanks and yeah idk those questions are pretty vague but thank you so much anyway!
May 21, 2012

chemistry
1. When the energy released by the formation of solute-solvent attractions is greater than the energy absorbed by overcoming solute-solute and solvent-solvent attractions, the dissolving process ____. 2. Mixtures are classified according to their ____. 3. A homogeneous mixture...
May 21, 2012

algebra 2 help please
Actually, you should come out with .89. My teacher told us that it is 1 - 12P7/12^7.
May 21, 2012

algebra 2 help please
0.22
May 21, 2012

dressmaking
When preparing patterns,the chest measurement is make horizontally at A) the largest part of the bust B) the widest part of the back C) an area under the arm C) an area between shoulderline and bustline I'm thinking it could be either C or D
May 21, 2012

CALCULUS
Consider the function f(x)=5–4x^2 , -3≤x≤1 The absolute maximum value is __________ and this occurs at x equals ___________ The absolute minimum value is _________ and this occurs at x equals ___________
May 19, 2012

CALCULUS
The circumference of a sphere was measured to be 83000 cm with a possible error of 050000 cm. Use linear approximation to estimate the maximum error in the calculated surface area. ________________ Estimate the relative error in the calculated surface area. _________________
May 19, 2012

CALCULUS
The differential of the function y=(x^2+9)^3 is dy=_________ dx. When x=3 and dx=005, the differential dy=_________
May 19, 2012

CALCULUS
The linearization at a=0 to sqrt(6+6x) is A+Bx where A is:_____ and where B is:_____
May 19, 2012

Math
Can you help me with the following Input and Output values? Input 0 Output 1 Input 1 Output 10 Input 2 Output 20 Input 3 Output 30 Input 4 Output 40 Input 5 Output 50
May 17, 2012

chem, predicting direction of change in entropy
Positive
May 17, 2012

Trig
Find the eccentricity of the ellipse. x^2+7y^2=35
May 16, 2012

Math
What is the rule if the input number is 32 and the output is 5 input number is 40 and the output is 6 input number is 48 and the output is 7 input number is 56 and the output is 8 input number is 64 and the output is 9
May 16, 2012

dressmaking
The book says cut 2 bits of fabric on the bias to the desired length and width of the bow and then it tells yu how to make the bow as well as how to make the knot.It doesnt say if yu need to use any extra fabric for the knot only tells yu how to make and attach it to the bow....
May 16, 2012

dressmaking
How many separate pieces of fabric are used to form a bow and knot added as a decoration down the center of a dress A) Two B) Three C) Four D) Five Guessing that the answer could be A or C as fabric has raw edges which needs to be joined together on the wrong side,turned over ...
May 16, 2012

Calculus
As you know, Chemproc, Inc. is a premier manufacturer of chemicals and chemical waste. Further, as has been recently highlighted on the local news, we are in the process of expanding our Lonlinc, Skanebra chemical manufacturing plant to add two or three new products to our ...
May 13, 2012

open collages "pet obedience trainer'
which one of the following statements describes classical conditioning: A. it generally involves more than one independant variable B. it involves the pairing of a conditioned stimulus with an unconditioned stimulus C. it depends on a close relationship between responses and ...
May 13, 2012

Chemistry!!
Calculate the pH at the equivalence point for the titration of 0.180 M methylamine (CH3NH2) with 0.180 M HCl. The Kb of methylamine is 5.0× 10^–4.
May 11, 2012

Chemistry
A 0.140-mole quantity of CoCl2 is added to a liter of 1.20 M NH3 solution. What is the concentration of Co^2+ ions at equilibrium? Assume the formation constant of Co(NH3)6^2+ is 5.0× 10^31.
May 11, 2012

math
that's right
May 11, 2012

Chemistry
For the first one I put 2NaOH (aq) + Pb(NO3)2 (aq) ==> Pb(OH)2 (s) + 2NaNO3 (aq) and for the second Pb(OH)2 (s) + 2NaOH (aq) ==> Na2Pb(OH)4 (aq) and it keeps saying the second one is wrong. I don't understand what's incorrect.
May 11, 2012

Chemistry
Write the balanced chemical equation for each of these reactions. Include phases. When aqueous sodium hydroxide is added to a solution containing lead(II) nitrate, a solid precipitate forms. However, when additional aqueous hydroxide is added the precipitate redissolves ...
May 11, 2012

sociology 100,social structure
You are walking down the street and in looking around, you can’t help but notice that half or more of the people you see are overweight. How do you explain this observation? Is obesity a personal issue or a societal one? If you were C. Wright Mills, how do you think you ...
May 11, 2012

Science
Saturated, because you added the salt.
May 11, 2012

Chemistry
7.8 g of calcium fluoride is dissolved in 100 L of water at 25°C. Will a precipitate be formed?
May 10, 2012

Chemistry
Calculate the solubility of CaCrO4 if its Ksp is 1.6 x 10-9 at 25°C, in mg/L.Ksp = 1.6 x 10-9
May 10, 2012

Chemistry
Initially, we place 2 mol of A and 4 mol of B in a 0.5 L flask. At equilibrium, the flask contains 0.3 mol of C. Determine the value of K. A(g) + B(g) <--> 3C(g) + 2D(g)
May 10, 2012

Chemistry
0.1 mol of HCl is added to 1 L of water. What is [H+] and [OH-]?
May 10, 2012

Chemistry
A beaker contains 100 mL of water. We add 112 mg of KOH(s). What is the concentration of H+ions?
May 10, 2012

Chemistry
Which of the following is a condensation reaction? Two monomers combine when one adds to the double bond of another. Two monomers break away when one forms a double bond. Two monomers break away with the addition of a water molecule. Two monomers form a new bond with the loss ...
May 10, 2012

Chemistry
What is the pH of a solution of 0.1 M silver hydroxide, which is only 10% ionized?
May 10, 2012

Chemistry
What is the concentration of H+ in a solution containing 73.0 g of HCl in 0.5 L of water?
May 10, 2012

chemistry
I don't quite under stand that answer..
May 10, 2012

chemistry
What are [H+] and [OH-] for 0.01 M perchloric acid?
May 10, 2012

AP Lit and Comp
what is the difference between paradox, juxtaposition, and antithesis?
May 10, 2012

Physics
A .145kg baseball pitched at 39m/s is hit on a horizontal line drive straight back toward the pitched at 52m/s. If the average force the bat exerts on the ball is 13,200N, how long did the collision last?
May 9, 2012

Physics
A 2.5kg ball strikes a wall with a velocity of 8.5m/s to the left. The ball bounces off the wall with a velocity of 7.5m/s to the right. If the ball is in contact with the wall for .25s, what is the constant force exerted on the ball by the wall?
May 9, 2012

Physics
A 55 kg pole vaulter falls from rest from a height of 5m onto a foam rubber pad. The pole vaulter comes to rest .3s after landing on the pad. A) calculate the athlete's velocity just before reaching the pad B) calculate the constant force exerted on the pole vaulter due to...
May 9, 2012

Physics
a car crashes into a wall at 25m/s and is brought to rest in .1seconds. Calculate the average force exerted on a 75kg test dummy by the seat belt. How many g-forces is this? (Remember g-force= Force/mg)
May 9, 2012

Physics
A .060kg tennis ball crosses the net a 40m/s and is returned back across the net at 36m/s by the other player. If the contact time between racket and the ball is .0250s, what is the average force on the ball?
May 9, 2012

Physics
A 50g bullet strikes a stationary 1.50kg block of wood paced on a horizontal surface just in front of the gun. The bullet becomes embedded in the block and the impact drives them a distance of 10m before they come to rest. If the coefficient of kinetic friction between the ...
May 9, 2012

Physics
A rocket car had a mass of 1650kg. The engine expels 140kg of combustion products in 7s. The expelled material has a velocity of 850m/s to the south. Calculate the velocity of the car at the end of 7s. ANSWER: 72m/s to the north
May 9, 2012

Physics
A bullet of mass 35g strikes a stationary wooden block of mass 2.6kg, becomes embedded in the block, and they both move off at 7.5m/s. What was the original velocity of the bullet?
May 9, 2012

Physics
object A of mass 3g with a velocity of 12cm/s to the east, collides with stationary object B. After collision, object A rebounds with a velocity of 10cm/s to the west and object B has a velocity of 1.5cm/s to the east. Calculate the mass of obeject B
May 9, 2012

Chemistry
Yes that makes a lot of sense now! Thank you so so much!:)
May 9, 2012

math-permutuation
a four digit serial number needs to be created using digits 0-9. first digit is even , no digit is repeated , last digit is odd
May 9, 2012

chemistry
What is the pH of a solution having a hydrogen ion concentration of 1x10^-5 M? Also the same question, but Hydroxide instead of hydrogen. thanks in advance!
May 9, 2012

Calculus
Approximate the sum of the series correct to four decimal places. n=1 to infinity (-1)^n/4^n*n!
May 8, 2012

PHYSICS
A tuning fork is set into vibration above a vertical open tube filled with water. The water level is allowed to drop slowly. As it does so, the air in the tube above the water level is heard to resonate with the tuning fork when the distance from the tube opening to the water ...
May 7, 2012

math
given f(x)=x^3+5x find the rate of change for the interval [0.5,0.51]
May 7, 2012

Physics
KE1= M1.v1'2/2 KE2= M2V2'2/2 KE1= [(1000kg)(277.89m'2/s'2)/2] = 138944.45J KE2= [(2000kg) (69.3889'2/s'2)/2] = 69388.9J KE1/KE2= 138944.45J/69388.9J =2.00
May 7, 2012

Physics
A king's crown is said to be solid gold but may be made of lead and covered with gold. when it is weighed in air, the scale reads 0.475 kg. when it is submerged in water the scale reads 0.437 kg.is it solid gold? if not, what percent is mass is gold? (density of gold= 19....
May 6, 2012

physics
A scuba diver searches for treasure at a depth of 20.0m below the surface of the sea. at what pressure must the scuba device deliver air to the diver? (density of sea water= 1030kg/m^3;atmospheric pressure= 1.013x10^5 pa)
May 6, 2012

Calculus
(-1)^1/4^1*1 + (-1)^2/4^2*2 + (-1)^3/4^3*3 + (-1)^4/4^4*4 + (-1)^5/4^5*5 + (-1)^6/4^6*6
May 6, 2012

Calculus
The answer I got was 0.9336. I did
May 6, 2012

Calculus
Approximate the sum of the series correct to four decimal places. n=1 to infinity (-1)^n/4^n*n!
May 6, 2012

psychology
the term "insanity" is used
May 5, 2012

CHEMISTRY
A 22.2-g piece of Al (which has a molar heat capacity of 24.03 J/mol°C) is heated to 84.6°C and dropped into a calorimeter containing water (the specific heat capacity of water is 4.18 J/g°C) initially at 23.5°C. The final temperature of the water is 27.8°C...
May 1, 2012

CEMISTRY
Consider a weak acid HX. If a 0.10 M solution of HX has a pH of 5.87 at 25°C, what is ΔG° for the acid's dissociation reaction at 25°C?
May 1, 2012

chemistry
T = 765 K, PN2 = 31 atm, PH2 = 182 atm, PNH3 = 15 atm
May 1, 2012

chemistry
Calculate ΔG for this reaction under the following conditions (assume an uncertainty of ±1 in all quantities). Assume that ΔH° and ΔS° do not depend on temperature.
May 1, 2012

Math /Algebra
Equation: y=mx+b If m= slope b= y-intercept what is x and y??? I doubt I worded this in a way that makes sense but I need help.
May 1, 2012

statistics
: an airline offers discounted advanced purchase fares to customers who buy tickets more than 30 days before travel and charges regular fares for tickets purchased in the last 30 days before travel. The airline notices 60% of its customers take advantage of the advanced ...
May 1, 2012

CHEMISTRY
The enthalpy of neutralization for the reaction of a strong acid with a strong base is −56 kJ/mol of water produced. How much energy will be released when 198.5 mL of 0.400 M HCl is mixed with 150.1 mL of 0.500 M NaOH?
May 1, 2012

CHEMISTRY
Consider the following cyclic process carried out in two steps on a gas. Step 1: 41. J of heat is added to the gas, and 20. J of expansion work is performed. Step 2: 60. J of heat is removed from the gas as the gas is compressed back to the initial state. Calculate the work ...
April 30, 2012

CHEMISTRY
In a coffee cup calorimeter 70.0 mL of 0.100 M AgNO3 and 70.0 mL of 0.100 M HCl are mixed to yield the following reaction. Ag+(aq) + Cl ‾(aq) → AgCl(s) If the two solutions are initially at 22.60°C, and if the final temperature is 23.39°C, calculate ΔH...
April 30, 2012

social studies
Different labor systems and cultures predominated in various regions of British America. How did the economy of each region help determine its labor systems and customs?
April 30, 2012

Physics
The mass of a rocket car plus fuel is 2,000kg. The rocket car starts from rest. The engine expels fuel(in the form of exhaust) over a period of 8 seconds. The exhaust has a velocity of 1,000m/s due west, and the velocity of the rocket car after 8 seconds is 90m/s due east. How...
April 30, 2012

dressmaking
Thanks for the help
April 30, 2012

dressmaking
A houndstooth(black and white plaid) jacket would work well with which of the following bodylines? A) Straight B)Soft-straight C)Soft-curved D)curved Im thinking it could be A or B.Need help for this question
April 30, 2012

Statistics
The author’s of the article “Perceived risks of Heart Disease and Cancer Among Cigarette Smokers” expressed the concern that a majority of smokers do not view themselves as being at increased risk of heart disease or cancer. Because of this, the authors call for...
April 30, 2012

Physics
a 1.5kg cannon is mounted on top of a 2.0kg cart and loaded with a 52.7 gram ball. The cannon, car, and ball are moving forward with a speed of 1.27m/s. The cannon is ignited and launches a 52.7 gram ball forward with a speed of 75m/s. Determine the post-explosion velocity of ...
April 30, 2012

Physics
The mass of a rocket car plus fuel is 2,000kg. The rocket car starts from rest. The engine expels fuel(in the form of exhaust) over a period of 8 seconds. The exhaust has a velocity of 1,000m/s due west, and the velocity of the rocket car after 8 seconds is 90m/s due east. How...
April 29, 2012

Physics
In an unusual return to space, Astronaut Sally Ride is conducting repair work on the Hubble Space telescope. She throws a hammer of mass 500.0g forward at 20.0m/s. The astronaut, mass 80.0kg, recoils in the opposite direction. What is Sally's recoil velocity?
April 29, 2012

Physics
Philadelphia Flyers player Mike Richards stands on the frictionless ice next to the goal. Neither Mike nor the goal are anchored to the ice. Frustrated after a recent playoff loss, 102.5kg Mike suddenly pushes on the goal, sending it across the ice a 2.80m/s. Mike recoils in ...
April 29, 2012

Physics
after an ice show, Michelle helps clear the props from the ice. Standing in her skates next to a potted artifical tree, she gives it a push. The tree, which has a mass of 6500g, slides forward at a velocity of 13m/s. Michelle, with a mass of 40.0kg, slides in the opposite ...
April 29, 2012

Physics
a 1.5kg cannon is mounted on top of a 2.0kg cart and loaded with a 52.7 gram ball. The cannon, car, and ball are moving forward with a speed of 1.27m/s. The cannon is ignited and launches a 52.7 gram ball forward with a speed of 75m/s. Determine the post-explosion velocity of ...
April 29, 2012

Economics
You bought the bond for $1,040, after 6 months you received a coupon of $35 and after another 6 months you received another $35 coupon and you sold the bond for $1,070. What would be your total dollar return in that case? What would be your total percentage return? Would the ...
April 29, 2012

Math
You bought the bond for $1,040, after 6 months you received a coupon of $35 and after another 6 months you received another $35 coupon and you sold the bond for $1,070. What would be your total dollar return in that case? What would be your total percentage return? Would the ...
April 28, 2012

Math-helpppppp
1)when a certain polynomial is divided by x - 3, the quotient is x^2+2x-5 and the remainder is -3. what is the polynomial 2) Find each quotient and remainder. Assume the divisor is not equal to zero. a)(2x^2+29x-x^3-40)/(-3+x) b)(6+7x-11x^2-2x^3)/(x+9) c)(x^3-2x^2+4x+150/(x^2+...
April 28, 2012

Math--help help help
1)when a certain polynomial is divided by x - 3, the quotient is x^2+2x-5 and the remainder is -3. what is the polynomial 2) Find each quotient and remainder. Assume the divisor is not equal to zero. a)(2x^2+29x-x^3-40)/(-3+x) b)(6+7x-11x^2-2x^3)/(x+9) c)(x^3-2x^2+4x+150/(x^2+...
April 28, 2012

Sociology
How would eating disorders factor into the media/cultural aspect of sociology? Would they be considered an unintentional/long term media effect?
April 26, 2012

Physics
a 65-kg ice skater moving to the right with a velocity of 2.50m/s throws a .150kg snowball to the right with a velocity of 32.0m/s relative to the ground a) what is the velocity of the ice skater after throwing the snowball? b) a second skater initially at rest with a mass of ...
April 26, 2012

Physics
a 78kg hockey player standing on frictionless ice throws a 6.0kg bowling ball horizontally with a speed of 3.0m/s. With what speed does the hockey player recoil?
April 26, 2012

Physics
a space-satellite mass of 600kg fires a rocket engine for 2 seconds expelling 40kg of exhaust gases at 350m/s. By how much will the speed of the capsule change? You may consider the initial relative velocities to be zero, but would it matter?
April 26, 2012

Physics
a 3.5kg rifle fires a 5gram bullet with a muzzle speed of 300m/s. What is the recoil speed of the rifle?
April 26, 2012

Physics
A 24-ton freight car rolls along a straight track with a speed of 10mph. A 2.0 ton automobile falling vertically lands on the freight car from above. a) what is the speed of the freight car after the car lands on it? b) the car then rolls sideways off the freight car. What is ...
April 26, 2012

Physics
a 10,000kg boxcar rolling west at 60mph collides with an empty tanker of mass 7000kg sitting at rest on the track. The cars attach and continue to roll west on the track. What is the speed of the connected cars?
April 26, 2012

Physics
a diatomic molecule of oxygen traveling at 330m/s collides head on with a carbon dioxide molecule going 270m/s. The oxygen molecule bounces off the carbon dioxide molecule in the opposite direction going 365m/s. What is the speed and direction of the carbon dioxide molecule? (...
April 26, 2012

Physics
two carts with masses of 10.0kg and 2.5kg move in opposite directions on a frictionless track, with speeds of 6.0m/s and 3.0m/s respectively. The carts stick together after colliding head on. Find the final speed of the two cars
April 26, 2012

Physics
A 5-gram bullet going 200m/s hits a 40-gram "tin can" resting on a fence post. The bullet passes through the can emerging with a speed of 160m/s in the same direction. How fast, in the same direction, does the can go after the bullet has passed through.
April 26, 2012

geomitry
what measure is formed by the hands of a clock at 5:00
April 26, 2012

psychology
How is the experience of emotion related to engaging in health-promoting behaviors such as exercising and recreational sports? a) Negative emotion increases health-promoting behaviors. b) Positive emotion increases health-promoting behaviors c) Positive and negative emotions ...
April 26, 2012

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