Wednesday
April 16, 2014

Posts by Alexandra


Total # Posts: 102

Science
In a fetal pig, what are the 4 lobes of the brain and their functions?

Science (Help, please!)
"Toy Car A" is propelled by elastic force. The other forces acting on the car are gravity (pulling the car down) and friction force (between the car and the floor). What UNBALANCED forces are acting on the car? "Toy Car B" is propelled by air resistance. Th...

Science (Balanced/Unbalanced Forces)
"Toy Car A" is propelled by elastic force. The other forces acting on the car are gravity (pulling the car down) and friction force (between the car and the floor). What UNBALANCED forces are acting on the car? "Toy Car B" is propelled by air resistance. Th...

math
11:15 a.m. until 12:50PM WHAT IS THE ELAPSED TIME

MATH
Fabio said that there are 3 times as many people on a basketball team as on a tennis team. Is he correct? Explain why or why not.

Physical Science
Thank you very much!

Physical Science
24. What happens when a solution of nitric acid (HNO3) is added to a solution of potassium hydroxide (KOH)? What are the products? 25. Which of the following compounds can react with H2SO4 to form a salt: NaCl, Ca(OH)2, HF, AlCl3, H2O, Mg(OH)2? Name the salt(s) that would form...

Physical Science
C(s) + H2O(g) + Heat <--> CO(g) + H2(g) 17. How would you adjust the temperature to increase the amount of product? 18. Does the removal of hydrogen gas as it is produced shift the reaction to the left or the right? My last two questions on my homework that I just can...

Algebra Help
49^2+112r+64 = ___ First take care of the exponents: 49^2=2401 Add like terms: (2401+64)+112r 2401+64= 2465 2465 + 112r is your answer.

Physical Science
Which of the following is a single replacement? a. KOH + HCl --> KCl + H2O b. 2Na + 2H2O --> H2 + 2NaOH c. 2C2H6 + 7O2 --> 4CO2 + 6H2O d. H2O + CO2 --> H2CO3 Any help would be appreciated, thank you in advance!

Algebra 1
A vending machine had to be programmed to accept any combination of nickels, dimes, and quarters that totals 40 cents. How many different combinations are possible?

chem
write the correct net ionic equation and identify spectator ions when CoSO4 and BaCL2 mix

chem
how many mL of .135M Sr(OH)2 are needed to neutralize 35ml of .157M HCL I know the answer came out to 20.4 ml My only question is how do I convert HCL to Sr(OH)2

chem
The reaction: 2C2H2+5O2->5O2->4CO2+2H2O is performed by mixing 175 grams of C2H2 and 175 grams of O2 to produce 127 grams of CO2 1)Limiting reagent 2)Theretical yeield of CO2 3)Percent yield of CO2

Chemistry Please help
A bottle of 12.0 M hydrochloric acid has only 35.7 mL left in it. What will the HCl concentration be if the solution is diluted to 250.0 mL?

Chem simple question
why is it 2HCL

vocabulary
Breaking them into prefix, root, and suffix. And also telling what the prefix, root, and suffix mean.

vocabulary
How do you parse these words? 1. Rendition 2. Ambiguous 3. Deleterious 4. Euphemism 5. Alacrity 6. Respite 7. Polemical 8. Timorous 9. Adulation 10. Eschew

World History
How did Renaissance thinkers think the individual was defined? Explain how this idea can be compared with the value of an individual in ancient Roman and medieval European societies. Any help with this question would be greatly appreciated. Please and thank you!

Algebra 1
The manager of a shopping mall was asked to rope off a rectangular section of the parking lot for an automobile show. The area roped off was 250 ft by 300 ft. Post were to be placed every 25 ft around the lot. How many posts were needed? The one question I can't get past f...

algebra
The Environmental Protection Agency set a standard of 50 parts per billion of lead in drinking water. A new standard was set that safe water contains less than 15 parts per billion. a) write each of these rates as fractions using positive powers of ten. b) write each rate with...

calculus (gr 12)
Evaluate each of the following. Show all your calculations. a) f'(3) if f(x)  = x^4 − 3x b) f' (−2) if f(x) = 2x^3 + 4x^2 − 5x + 8 c) f" (&#...

calculus (gr 12)
Evaluate each of the following. Show all your calculations. a) f'(3) if f(x)  = x^4 − 3x b) f' (−2) if f(x) = 2x^3 + 4x^2 − 5x + 8 c) f" (&#...

calculus (gr 12)
Determine the velocity and acceleration as functions of time, t, for s(t) = 45t − 5t^2, where s(t) represents the distance as a function of time. (Hint: velocity and acceleration correspond to the first and second derivatives of the distance)

calculus (gr 12)
The forward motion of a space shuttle, t seconds after touchdown, is described by s(t) = 189t − t^3 , where " is measured in metres. a) What is the velocity of the shuttle at touchdown? b) How much time is required for the shuttle to stop completely? c) How ...

calculus
Determine the maximum and minimum of each function on the given interval. a)  = 2x^3 − 9x^2 ,−2 ≤ x ≤ 4 b)  = 12x − x^3 ,  x∈ [−3,5]

Grade 12 Calculus
State the absolute maximum value and the absolute minimum value of each function, if the function is defined on the interval shown. {I CANNOT POST THE GRAPH SO CAN SOMEONE EMAll ME AT miss.a.parker at hot mail(. com) SO I CAN EMAIL IT TO THEM SO YOU CAN HELP ME? I WOULD LOVE ...

Science
Assume you can heat water with perfect insulation (all the heat from combustion of ethanol is transferred to water). What is the volume of ethanol required to heat 100 mL of water by 10 degrees C? (You will need to look up density of ethanol, specific heat capacity or water, a...

statistics
. A certain researcher thinks that the proportion of women who say that female bosses are harshly critical is greater than the proportion of men. In a random sample of 200 women, 27% said that female bosses are harshly critical. In a random sample of 220 men, 25% said that fem...

Physics
If the puck strikes the goalie's pads and stops in a distance of 4.14 cm, what average force is exerted on the pads? Answer in units of N. This is part three of three parts. 1st Part: A player strikes a hockey puck giving it a velocity of 39.486 m/s. The puck slides across...

Science
Calculate the density of a material that has a mass 100g and a volume of 10 cm3

physics
A 20-N horizontal force pushes an object along a rough floor so that the object moves with a constant velocity of 7.0 m/s. How much power does this force deliver to the object?

physics
A 16.0-N weight slides down a rough inclined plane that makes an angle of 28.0° with the horizontal. The weight, which started from rest, gains a speed of 15.0 m/s after sliding 150 m. How much work is done against friction?

physics
An object of mass 5 kg is dropped from a certain height. Just before it strikes the ground it has a kinetic energy of 1250 J. From what height was the object dropped? Ignore air resistance and use g = 10 m/s2.

Geometry
You are planning to use a ceramic tile design in your new bathroom. The tiles are blue-and-white equilateral triangles. You decide to arrange the blue tiles in a hexagonal shape as shown. If the side of each tile measures 7 centimeters, what will be the exact area of each hexa...

Exploring Multiplication
how can you find out how many slices your class needs if each pizza has 8 slices and ther are 28 kids?

Chemistry
It does, thank you for the help! :)

Chemistry
It does, thank you for the help! :)

Chemistry
That is my guess, that decreasing the concnetration of a reactant will decrease the rate of the reaction because there is a decrease in the frequency of collisions. Am I right?

Chemistry
If the concentration of a reactant is decreased, will the speed of the reaction increase or decrease? Explain. I understand that if the concentration of a reactant is INCREASED, the frequency of coliision increases, making the rate of reaction increase. How aboout when the con...

Chemistry
Xe(g) + F2(g) ----uv light---> Xe F2(s) XeF2(g) + 2F2(g) ---catalyst---> XeF6(s) XeF6(s) + H2O(l) ------> Xe O3(s) + 6HF(g) Looking at these three reactions respond the following: a) For each 0.0250 grams of xenon hexaflouride that reacts, what mass of water is requie...

Chemistry
So I do know how to work out letter a) but I'm still very confused with parts b and c. Appreciate the help! 2FeN(s) + 3H2(g) --> 2Fe(s) + 2NH3(g) Suppose that the reaction is carried out at 300C and 3.00 atm. 1.00 grams of iron (III) nitride reacts. a)What is the volume...

Desert
How are deflation hollows made? Could you also give me some more pictures of hoodoos (the landforms)?

geometry
Point C is the center of the circle. Arc AB measures 5x + 2. Angle ACB measures 3x + 14. Find the value of x.

math
A green purse costs $11, which is 11 times as much as a red tie costs. How much does the red tie cost?

scientist
Which is the best reason for the smaller number of drone bees compared to the number of worker bees in a beehive?

math
To solve for the following proportion, you could use equivalent ratios, divide out the known ratio, or use cross products. Choose one of these methods to solve for t. Show your work and explain why you chose that method. 18/5 = 4/t

math
A plane flying with a constant speed of 14 km/min passes over a ground radar station at an altitude of 7 km and climbs at an angle of 35 degrees. At what rate, in km/min, is the distance from the plane to the radar station increasing 5 minutes later?

Calculus
The base of a solid is bounded by y=2sqrtx, y=2 and x=4. Find the volume of solid if cross sections perpendicular to y=2 are semicircles

Calculus
I don't understand how to answer this problem: The base of a solid is bounded by y=x+1 and y= x^2-1. Find the volume of the solid if the cross section is perpendicular to the x axis are equilateral triangles.

Chemistry
How many moles of acetic acid are there in 25 mL container?

Chemistry
If 10.0 grams of sodium bicarbonate reacts with 50.0mL of 2M acetic acid, what is the limiting reactant? what reactant is in excess, and by how much? What volume of carbon dioxide gas would form?

Finance
9 rights X $4 = 36 36 + $50 Stock = $86 Ex rights value of Fogel stock is $86.

phoenix
I'm in orientation classes at school, (online) and the teacher asked me this question, if my computer was damaged what is the others options had to send or save my homework?

phoenix
The library is an excellent sources and option. What are some other public option? examples & explanation.

statistics
Assume the IQ's of men and women can be described by a Normal model with a mean of 100 and a standard deviation of 15. For the first part: What percent of people do you expect to have IQ's over 120?

Algebra
A candy cane 30 cm high has a circumference of 3 cm. The red “ribbon” makes exactly 4 complete turns round the candy cane while its two ends touch the cane's top and bottom. How long is the ribbon in cm? It doesn't make any sense to me. Can somebody explain m...

Math/3rd grade
If you forget the product of 9 and 9, what can you do to figure it out?

6th grade
how do you do rate of change?

Physics
A 10.2 kg weather rocket generates a thrust of 200N. The rocket, pointing upward, is clamped to the top of a vertical spring. The bottom of the spring, whose spring constant is 500N/m, is anchored to the ground. a) Initially before the engine is ignited, the rocket sits at res...

college alg help!
cannot figure a way to do this problem: An investment of $98,000 was made by a business club. The investment was split into three parts and lasted for one year. The first part of the investment earned 8% interest, the second 6%, and third 9%. The total interest from the inves...

Chemistry
In the study of biochemical processes, a common buffering agent is the weak base trishydroxymethylaminomethane, often abbreviated as Tris. At 25 C, Tris has a pKb of 5.91. The hydrochloride can be abbreviated as Tris HCl. What volume of 10.0 M NaOH is needed to prepare a buffe...

6th grade
Can you simplify 9 over 16?

chemistry
what is the density of 700 ml of a gas that has a mass of 7 g?

Chemistryy
what mass of silver nitrate (AgNO3) is required to prepare 400 grams of a 3.50% solution of AgNO3? Options: 1. 0.00875 g 2. 114.28 g 3. 1400 g 4. 14 g

ap chem
calculate the lattice enthalpy of potassium fluoride from the following data: enthalpy of formation of K(g): +89 kJ · mol−1 first ionization energy of K(g): +418 kJ · mol−1 enthalpy of formation of F(g): +79 kJ · mol−1 electron affinity o...

physics
When a 2.60-kg object is hung vertically on a certain light spring described by Hooke's law, the spring stretches 2.30 cm. (a) What is the force constant of the spring? (b) If the 2.60-kg object is removed, how far will the spring stretch if a 1.30-kg block is hung on it? ...

chemistry
how many joules are formed when 3 moles oh CH4(g) react?

Chemistry
A gas storage tank has a volume of 3.5*10^5 m^3 when the temperature is 27 degrees celcius and the pressure is 101 kPa. What is the new volume of the tank if the temperature drops to -10 degrees celcius and the pressure drops to 95 kPa?

math
64/8

math
The quotient of two numbers is 8. The sum of the same two numbers is 72. What is the two numbers

college physics
Im not really sure, that is all that as being asked. Maybe it has to do with this first question as well?.... The electric field near the surface of a uniformly charged conducting plane can be determined by Gauss's law (look it up). If the plane is a square of sides 11.5 c...

college physics
Let's say that you find a slope of 6.671×10-14 for square plates of width 11.5 cm. What do you get for the value of the permittivity of free space?

physics
A 20.0kg mass is placed a the top of a 3.5m long, 15degree ramp. When released from rest, the mass accelerates down the ramp. The frictional force acting on the mass is 11.0 N. What is the velocity of the mass at the bottom of the ramp.

Language Arts
Risk is to chance as forthought is to?

Algebra
How long will it take $7,000 invested at 5.5% compounded daily to grow to $14,000? Round your answer to the nearest tenth of a year.

Biology
The adaptations of land-dwelling organisms forgetting oxygen show a trade-off of two needs. What are they?

social studies
did george washington want the great comprimes? Why?

French
meobdailfr.... its french what is the unscrambled...

Chemistry
Is the experiment to recreate the big bang theory by colliding to atoms being continued? If successful, would it really create a black hole?

english
latin roots half awake half sleep 13 letters

science
what is the 5th grade definition of calcium chloride

College Applications
Where can i find out what format to type my Background Information that entails Activities I have been in, the awards I have received from them, and past jobs that i have had? Thankyou.

french
I have to do a French collection about my playmobile I am 11 years old in grade five. How do I go about it.

french
I have to do a French collection about my playmobile I am 11 years old in grade five. How do I go about it.

physical Science
I'm having a lot of trouble writing my lab report it's on Density of common Solids and I'm so confused. PLEASE HELP!

science
Im having trouble writng my lab report its on Density of Solid objects and I don't know where to start!

math
she was practicing for a moon shot

Science 4th grade
Hi how do objects with opposite charges affect eachother and how do objects with the same charge affect eachother ?

science
What happends when the semi major axis is longer?

earth science
how are scientist approaching the study of Earth today?

earth science
Traditionally,how have different fields of earth science been studied?

algabra
U should try 2 change the denominators to make them alike so u will have 2 find tha least common denominator...

Math
Find the domain and range y=x^2-3x+8. Explain how you found the domain and range.

Chemistry
How was the weather related to the amount of electricity used in Riverwood? What ways did the power company use the river to help out, or harm in that situation?

egypt
can any one plaese tell me info about egypt like about cario...... because i need tomake a leaflet about egypt please help me.....

Math-Algebra
2ak-6a+k-3

History
Does anyone know what happened or have any good information about what happened to John F. Kennedy? OH! and if anyone has any clear pictures that would be good too!! Here are some good sites. http://en.wikipedia.org/wiki/John_F._Kennedy_assassination http://www.fiftiesweb.com/...

Math
How can i make nine equations with the numbers 2, 7 and one other number to equal 8. The first equation should have one as the other number, then two and so on up to 9. I can only use a number once for each expression. I can use arithmetic symbols, decimals, exponents and pare...

chemistry
At ph of 12 what charged groups would be present on glycine I said a NH2 and coo- Answered with some reluctance above.

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