Thursday

September 29, 2016
Total # Posts: 745

**chemistry**

An activation energy of 2.0 eV is required to form a vacancy in a metal. At 800¡èC there is one vacancy for every 10^-4 atoms. At what temperature will there be one vacancy for every 1000 atoms?

*April 15, 2013*

**Math**

120 people are given a survey about which television shows they watch. ABC=55 NBC=30 CBS=40 ABC and CBS=10 ABC and NBC=12 NBC and CBS and ABC=5 It wants you to solve for the remaining regions of the circle (mainly what NBC+CBS equal). I know you have to make a venn diagram but...

*April 10, 2013*

**Geometry**

On these types of questions I always like to do the opposite of the FOIL (First Outer Inner Last) method. Since the first coefficient is 2 we know we have to have a 2x and an x and then the -5 at the end will result in only 5 and a 1 (one has to be postive and one has to be ...

*April 10, 2013*

**Algerbra**

A boat's crew rowed 10.5 miles downstream, with the current, in 1.5 hours. The return trip upstream, against the current, covered the same distance, but took 3.5 hours. Find the crew's rowing rate in still water, and the rate of the current.

*April 10, 2013*

**world history**

4 famous poet during Spain golden age ?

*April 7, 2013*

**biology**

(1) XA Xa (2) Xa Y (3) Xa Xa (4) XA Y (5) XA Xa (6) XA Y (7) XA Xa (8) XA Xa (9) XA X_ (10) Xa Y (11) Xa Y

*April 7, 2013*

**MAH**

It is simple, you have to see that at what stage the nominator gets divisible by denominator, because u dont want any left over. so it is sixth stage. 5/6 +5/6 + 5/6 +5/6 + 5/6 + 5/6 = 30/6 , you need 6 bags.

*April 3, 2013*

**chemistry**

Don't forget just Arsenate, which is AsO4-3. That's the missing piece.

*March 23, 2013*

**uhar**

two blocks a and b are connected by a cord passes over a frictionless pulley. the mass of a is 1.2 kg and the magnitude of acceleration is 3.6

*March 21, 2013*

**Math - Quadratic**

a. 1 b. 0.2 c. -11

*February 19, 2013*

**discrete**

we have 20 kinds of presents. we want to give 12 children presents but each child doesn't need to get one. No child can get 2 copies of the same present. in how many ways can we give presents? please explain! the answer is (2^20)^12 but i dont see why

*January 31, 2013*

**Chemisty **

Determine how many calories are need to heat 30 grams of water from 10 degrees C to 30 degrees C

*January 30, 2013*

**chemistry **

What volume of 9.0Molarity of H2SO4 is required to react with 20.0g of NaOH?

*January 26, 2013*

**8th grade science**

write an advertisement that you could use to sell copies of Mendeleev's periodic table to chemists in 1869. Be sure to emphasize the benefits of the table to the chemical profession. Remember, the chemists have never seen such a table. i want you to give me an advertisement.

*January 22, 2013*

**science 8th grade**

give me an advertisement

*January 15, 2013*

**science 8th grade**

write an advertisement that you could use to sell copies of Mendeleev's periodic table to chemists in 1869. Be sure to emphasize the benefits of the table to the chemical profession. Remember, the chemists have never seen such a table.

*January 15, 2013*

**math**

4 pounds

*January 15, 2013*

**physics**

GET YOUR OWN DAMN HELP TRICK!

*January 15, 2013*

**k park **

how much heat must be removed froms 20 g of water at 130 c to make 20 g water at -22 c

*January 14, 2013*

**muniz**

how much heat must be removed from 20g of water at 130 c to make 20 g water at -22 c

*January 14, 2013*

**chemistry**

I need the answer

*January 13, 2013*

**physics**

sphere A has a mass of 4.2*10^-2 kg and is tethered to a wall by a thin thread. Sphere a has an excess of 1.2 *10^12 electrons. Sphere B has a deficit of 3.5*10^12 electrons and is o.23 m from sphere A a) determine the angle between the thread and the wall b) determine the ...

*January 12, 2013*

**English**

its wrong Nicole is rite trust me

*December 28, 2012*

**Chemistry**

two D-glucose monosaccharide units

*December 16, 2012*

**psychology**

anterograde amnesia

*December 9, 2012*

**Cell Biology**

1. Which molecule is the major contributor to the increase in mass observed in a full grown plant (i.e. tree) compared to a plant seed? I'm thinking it could be either of these three: D-glucose, C02, or H20.. help?

*December 8, 2012*

**Math [Consumer Surplus]**

The demand function for a certain brand of blank digital camcorder tapes is given by p=−0.02x^2−0.1x+24 where p is the wholesale unit price in dollars and x is the quantity demanded each week, measured in units of a thousand. Determine the consumers' surplus if...

*November 30, 2012*

**Calculus [Finding volume of solid]**

Find the volume of the solid obtained by rotating the region bounded by the given curves about the specified axis. y=x^2 y=0 x=3 about the y-axis

*November 30, 2012*

**Calculus [Finding volume of solid]**

Find the volume of the solid formed by rotating the region enclosed by x=0 x=1 y=0 y=4+x^5

*November 30, 2012*

**Calculus [rotation of region bounded by curves]**

Find the volume of the solid obtained by rotating the region bounded by the given curves about the specified axis. y=3x^2, x=1, y=0 about the x-axis

*November 30, 2012*

**Calculus: Help !**

The demand function for a certain brand of blank digital camcorder tapes is given by p=−0.02x^2−0.1x+24 where p is the wholesale unit price in dollars and x is the quantity demanded each week, measured in units of a thousand. Determine the consumers' surplus if...

*November 30, 2012*

**grammar**

correct the grammar of the following text: Jason Turner thought he did the right thing when he had seen a man get into a car and drive off much too fast. A year earlier, another dangerous drive was injuring a friend of his, when he was knocking him off his motorbike. So Mr. ...

*November 20, 2012*

**Calculus [finding slope of tangent line]**

Find the slope of the tangent line to the curve 0x^2−2xy+2y^3=10 at point (-4,1) Help please? Thanks in advance

*November 18, 2012*

**physics**

A meterstick (L = 1 m) has a mass of m = 0.174 kg. Initially it hangs from two short strings: one at the 25 cm mark and one at the 75 cm mark.

*November 18, 2012*

**Math**

Find the slope of the tangent line to the curve 0x^2−2xy+2y^3=10 at point (-4,1) Help please? Thanks in advance

*November 17, 2012*

**Calculus [Implicit Differentiation]**

If √x+√y=10 and y(16)=36, find y'(16) by implicit differentiation. If somebody could please help me by explaining how to solve this problem ! Thank you (:

*November 17, 2012*

**Chemistry**

28

*November 16, 2012*

**Math**

The girls' high school basketball team played 12 games. They won 6 more games than they lost. Find the number of games the basketball team won.

*November 8, 2012*

**art**

How to make a concept about abstract painting

*November 6, 2012*

**Business English**

I have a positive attitude, even with boring tasks, I still get the job done./or I never complain. How can I phrase this into a more professional way? Thanks.

*October 30, 2012*

**Sunset**

At noon, ship A is 50 miles north of ship B and is headed south at 16mph. Ship B is headed west at 12 mph. At what time are they closest together, and what is the minimum distance between them?

*October 24, 2012*

**Calculus**

Two ships leave the same port at noon. Ship A sails north at 22 mph, and ship B sails east at 12 mph. How fast is the distance between them changing at 1 p.m.? (Round your answer to one decimal place.)

*October 10, 2012*

**math**

how many 2 inch pieces can be cut from a 10 foot bar

*October 10, 2012*

**physics**

In a new scenario, the block only makes it (exactly) halfway through the rough spot. How far was the spring compressed from its unstretched length?

*October 4, 2012*

**Maths **

A ball bounces two-thirds of the distance it falls. If it is dropped from a height of 10 meters, how far does it move before hitting the floor for the fourth time?

*October 3, 2012*

**physics**

At the instant the traffic light turns green, an automobile that has been waiting at an intersection starts ahead with a constant acceleration of 2.80{\rm m}/{\rm s}^{2} . At the same instant, a truck, traveling with a constant speed of 14.8{\rm m}/{\rm s} , overtakes and ...

*September 27, 2012*

**physics**

You are on an airplane traveling 30° south of due west at 130.0 m/s with respect to the air. The air is moving with a speed 31.0 m/s with respect to the ground due north. 1) What is the speed of the plane with respect to the ground? 2) What is the heading of the plane with...

*September 10, 2012*

**physics**

You are on a train traveling east at speed of 17.0 m/s with respect to the ground. 1) If you walk east toward the front of the train, with a speed of 1.1 m/s with respect to the train, what is your velocity with respect to the ground? 2) If you walk west toward the back of the...

*September 10, 2012*

**pyhsics**

A cannonball is shot (from ground level) with an initial horizontal velocity of 36.0 m/s and an initial vertical velocity of 21.0 m/s. 1) What is the initial speed of the cannonball? 2) What is the initial angle θ of the cannonball with respect to the ground? 3) What is ...

*September 8, 2012*

**physics**

A red ball is thrown down with an initial speed of 1.2 m/s from a height of 25.0 meters above the ground. Then, 0.6 seconds after the red ball is thrown, a blue ball is thrown upward with an initial speed of 22.9 m/s, from a height of 0.8 meters above the ground. The force of ...

*September 3, 2012*

**college**

A blue ball is thrown upward with an initial speed of 19.8 m/s, from a height of 0.5 meters above the ground. 2.4 seconds after the blue ball is thrown, a red ball is thrown down with an initial speed of 7.9 m/s from a height of 22.5 meters above the ground. The force of ...

*September 3, 2012*

**maths**

in a boy's school,5/8 of the boys play football and 4/7 play rugby.if every boy play atleast one of the two games,ind the fraction of the boys who play both ?

*August 27, 2012*

**bond**

Assume an investor with 5 years investment horizon is considering purchasing a 7 years 6% coupon selling at par. The investor expects to reinvest the coupon at 5% and that the bond will be selling to offer a yield to maturity of 4% in five years. What is the expect total ...

*July 30, 2012*

**physical science**

A train sounding its horn is approaching an observer. The pitch of the horn's sound relative to its normal pitch is???

*July 25, 2012*

**Math**

216

*July 16, 2012*

**KSU**

At 3 P.M, ship A is 150 km west of ship B. Ship A is sailing east at 35 km/h and ship B is sailing north at 25 km/h. How fast is the distance between the ships changing at 7 P.M.? (Round your answer to one decimal place.)

*June 28, 2012*

**Math**

Thank You

*June 18, 2012*

**Math**

11+2*(6+11)

*June 18, 2012*

**Chemistry**

In the following experiment, a coffee-cup calorimeter containing 100 \rm mL of \rm H_2O is used. The initial temperature of the calorimeter is 23.0 \rm ^{\circ}C. If 9.80 g of \rm CaCl_2 is added to the calorimeter, what will be the final temperature of the solution in the ...

*June 17, 2012*

**Biology**

Which of the following are three common characteristics of echinoderms? A tube feet, circulatory system, body symmetry B marine-dwellers, endoskeletons, water-vascular system C bilateral symmetry, ossicles, respiratory system D mouths, protosomes, body symmetry is it C...

*June 14, 2012*

**geography**

Southwest Asia can best be characterized as A) an area with few resources. B) a desert with an arid and semiarid climate. C) a region of forests. D) an area of forests and grasslands. I think it's B, just checking! thanks in advance

*June 7, 2012*

**business**

Is the correct answer D?

*June 6, 2012*

**Physiology**

if someone is infected with the common cold virus, which type of nonspecific immune response would attempt to deal with the invader? A) T cells B) b cells C) antibodies D) none of these

*June 6, 2012*

**Math**

how do you subtract hundreds?

*June 4, 2012*

**Chemistry**

1.) What are the equilibrium partial pressures of CO and CO2 if co is the gas present initially, at a partial pressure of .912 atm. Kp = 19.9 Fe2O3 + 3CO <--> 2Fe + 3CO2 I'm trying to find partial pressure of both CO and CO2 by calculating for "x" in the ...

*May 8, 2012*

**statistics**

a set of maths exame score mean is 70 and variance is 8. a set of english score has mean is 74 and variance is 16. for which exame whould a score of x=78 have a higher standing?

*May 5, 2012*

**calcalus**

Water is leaking out of an inverted conical tank at a rate of 12200 cubic centimeters per minute at the same time that water is being pumped into the tank at a constant rate. The tank has height 15 meters and the diameter at the top is 65 meters. If the water level is rising ...

*May 2, 2012*

**Chemistry**

KMno4+NaHso3

*May 2, 2012*

**physics**

A 40N force applied at an angle of 37 degrees above the horizontal pulls a 5kg box on a horizontal floor. the acceleration of the box is 3meter per second square. how large a frictional force must be retarding the motion of the box. a.50N b.13N c.17N d.25N

*April 20, 2012*

**physics**

a 2kg and a 4kg hang freely at opposite end of a light in-extensible string which passes over a small and light pulley fixed to a rigid support.calculate the acceleration of the system. a.3.3M/S square b.2.67m/s square c.4.41m/s square d.2.67m/s square.

*April 20, 2012*

**physics**

a 2kg and a 4kg hang freely at opposite end of a light in-extensible string which passes over a small and light pulley fixed to a rigid support.calculate the acceleration of the system.

*April 20, 2012*

**Thermodynamics**

Suppose an enzyme lowers the activation energy by an order of magnitude. What is the ratio of catalyzed rate to the uncatalyzed rate at at 25 °C? at 37 °C?

*April 9, 2012*

**Honors Chemistry**

1. 5 2. 1.0 x 10^-5 3. 2.5 4. 12 5. 1.26 x 10^-9

*April 6, 2012*

**math**

The perimeter of a rectangular pool is 84 feet. The width of the pool is half the length. What are the measurements of the rectangular pool?

*March 20, 2012*

**trig**

if cot(x-10)=tan(4x) what does x equal?

*March 4, 2012*

**chemistry**

how do you do electron dot diagrams?

*March 3, 2012*

**Math**

4*10=40 slices of bread. 18 ppl eat 2 slices each, making 36 eaten 36/40 slices were eaten

*March 1, 2012*

**Chemistry--Plz HELP!**

How would i go about balancing the following equation? My teacher said something about the charges: Silver Nitrate + Sodium Phosphate = Silver Phosphate + Sodium Nitrate

*March 1, 2012*

**Chemistry-Stoichiometry**

A 1.146 mixture of the solid salts Na2SO4 and Pb(No3)2 forms an aqueous solutionwith the precipitation of PbSO4. The precipitate was found to weigh 0.672g. The limiting reactant is Na2SO4. What is the percent by mass of each salt in the mixture?

*March 1, 2012*

**math 2nd grade**

simon ate 3/2 slices of an apple. Did he eat less than a whole apple or more than the whole apple. Draw a picture to show your answer

*February 29, 2012*

**Econnomics**

junanita has 6000 in a two year certificate of deposit (CD) money supply definitions

*February 28, 2012*

**MATH - area question **

I need help on where to begin with this problem. You are installing a new deck around your pool. The pool is rectangular with the dimensions 8m by 4m. The deck will surround the pool and will have a width by 2m. What is the area of the deck? I know that A=LxW and that the Area...

*February 27, 2012*

**Math (Area)**

I need help on where to begin with this problem. You are installing a new deck around your pool. The pool is rectangular with the dimensions 8m by 4m. The deck will surround the pool and will have a width by 2m. What is the area of the deck? I know that A=LxW and that the Area...

*February 27, 2012*

**math**

lisette drew a rectangle and divided it into fourths. She colored the whole rectangle. How many fourths were colored?

*February 27, 2012*

**math**

simon ate 3/2 slices of an apple. Did he eat less than a whole apple, the whole apple or more than a whole apple. Draw a picture to show the answer.

*February 27, 2012*

**MATH**

what addition fact can help you find 14-4? explain

*February 27, 2012*

**english**

what does this question mean?

*February 21, 2012*

**english**

also how does she describe her feelings as she waits for him?

*February 21, 2012*

**english**

ROMEO AND JULIET what are juliets feelings towards romeo in act 3 scene 2 from lines 1-35?

*February 21, 2012*

**chemistry**

Sketch one face of a simple cubic unit cell of side a for the case when the maximum fraction of the lattice in volume is filled with atoms, and each atom is approximated by a hard sphere. (ii) What is the radius of each atom in terms of a? (iii) What is the volume of each atom...

*February 19, 2012*

**engineering**

Sketch one face of a simple cubic unit cell of side a for the case when the maximum fraction of the lattice in volume is filled with atoms, and each atom is approximated by a hard sphere. (ii) What is the radius of each atom in terms of a? (iii) What is the volume of each atom...

*February 19, 2012*

**math**

for every 20 math books a school buys, they they get 7 aditional books for free. The school needs 297 math books. What is the total number of math books the school must buy in order to receive 297 math books in all?

*February 8, 2012*

**Physics**

a boat sails steadily across a river ,with velocity 20 m/s. if the river has width 30 m, how long does it take the boat to get across ,and how far downstream is it swept by the currenty first

*February 6, 2012*

**physics**

I don't know

*January 30, 2012*

**Dynamics**

A quarterback throws a football with a velocity vo at an angle of 45o with the horizontal. At the same instant a receiver standing 20 ft in front starts running down the field at 15 ft/s and catches the ball. What is the distance of the receiver from the quarterback when the ...

*January 30, 2012*

**math**

Thank You so much Ms. Sue,

*January 26, 2012*

**math**

3rd grade create an algorithm that has a difference of 20

*January 26, 2012*