Friday

February 24, 2017
Total # Posts: 8,250

**Chemistry**

What is the total ionic equation of this: 3CaCl2(aq) + 2K3PO4(aq) → Ca3(PO4)2(s) + 6KCl(aq) Shw all physical states of the reactants and products

*September 26, 2014*

**Physics**

4. A ball is kicked toward a fence from a point 32 meters away. The velocity of the ball as it leaves the kicker’s foot is 24 m/s at an angle of 37 degrees above the horizontal. The top of the fence is 2.0 meters high. Assuming air resistance to be negligible…(1 ...

*September 25, 2014*

**Maths**

I don't know so help me

*September 25, 2014*

**Grammar**

Sentence: I tried all of the natural remedies, such as dishwashing liquid, but the ants kept coming back. Is there a comma before "such as"

*September 24, 2014*

**MATH**

Estimate the indicated derivative by any method y=1-x^2 ; estimate dy/dx , x=-1 I know I would use the f(x)= f(x+H)-(x)/h I am a bit overwhelmed with what to do next. Thanks John

*September 24, 2014*

**algebra**

I invest a sum of money at 10% annual simple rate and twice that amount at 12% annual simple interest.My total yearly in come from both investment was $2890,how much was invested at each rate? Also What is the speed of each train if one train travels 8 mph faster than the ...

*September 24, 2014*

**English**

What are all of the prepositional phrases in the following sentence: Ancestors, in every variety of dress, from the Elizabethian knight to the buck of the Regency, stared down and daunted us.

*September 22, 2014*

**algebra**

Thank You

*September 22, 2014*

**algebra**

a 25 inch piece of a steel rod is cut into 3 pieces so that the length of the second piece is twice the length of the first piece.The third piece is 1 inch longer than 5 times the length of the first piece.What are the lengths of the pieces

*September 22, 2014*

**physics**

A soccer ball is kicked horizontally from the edge of a 125 m high cliff with an initial speed of 15 m/s. At what horizontal distance does the ball land?

*September 21, 2014*

**physics**

A ball is thrown straight up into the air. At each of the following instants, is the magnitude of the ball's acceleration greater than g, equal to g, less than g, or zero? Air resistance may be neglected. A) just after leaving your hand? B) at the very top (maximum height...

*September 21, 2014*

**Chemistry (Ionic Equilibria)**

When a WEAK acid can be said to be weak, and when a WEAK acid can be said to be strong? I only know the difference between weak acids and strong acids, but i don't know that even weak acids can be classified as weak and strong. Plz help

*September 21, 2014*

**Math**

What is the largest possible value of the sum of 1000

*September 19, 2014*

**Physics 12**

A sports car is travelling along a highway at a constant velocity of 36 m/s [N] exceeding the speed limit. It passes an unmarked police car parked on the shoulder of the highway. The police car accelerates from rest, 3.0 s after the sports car passed it, at the rate of 6.0 m/...

*September 18, 2014*

**Calculus**

Calculate the average rate of change of the given function f over the intervals [a, a+h] where h=1, 0.1, 0.01, 0.001, and 0.0001. I have no clue how to do this. Any help would be appreciated. Thanks I know I use the formula f=f (a+h) - f (a)/h Then do I need to plug in the -2x...

*September 16, 2014*

**trig**

A planes actual resulting ground speed and direction are 550 mph and N26E. A wind is blowing from the northeast. If the pilot is holding a course of N27E how fast is the wind blowing I'm just stumped. It's an extra credit question is basically why I'm stumped.

*September 16, 2014*

**Trig**

A planes actual resulting ground speed and direction are 550 mph and N26E. A wind is blowing from the northeast. If the pilot is holding a course of N27E how fast is the wind blowing?

*September 16, 2014*

**Sublette**

An appellate court that hears an appeal on a money laundering case from a district court

*September 16, 2014*

**business finance**

can yiu help me with this asignment

*September 15, 2014*

**chemistry**

The ionic radii of Na+ (atomic weight 22.99) and Cl- (atomic weight 35.45) are 1.0 and 1.8 Angstrom, respectively. Treating the ions as hard spheres, calculate the density of NaCl. Compare this with the measured density of 2.17 g/cm3.

*September 13, 2014*

**science**

(1.b) Calculate your de Bröglie wavelength and momentum when you are driving a car at a speed of 104 km/hr (~65 mph), assuming your mass is 80 kg.

*September 13, 2014*

**maths**

An ant must walk from one vertex of a cube to the "opposite" vertex (that is, the vertex that is farthest from the starting vertex) and back again to its starting position. It may only walk along the edges of the cube. For the entire trip its path must traverse ...

*September 12, 2014*

**math**

Every marble in a jar has either a dot, a stripe or both. The ratio of striped marbles to non-striped marbles is 3:1, and the ratio of dotted marbles to non-dotted marbles is 2:3. If six marbles have both a dot and a stripe, how many marbles are there all together?

*September 12, 2014*

**Math**

14.4ft.

*September 10, 2014*

**algebra**

Solve F(x) for the given domain. Include all of your work in your final answer. Submit your solution. F(x) = x2 + 2 F(x + h) =

*September 10, 2014*

**physics**

Assume a projectile is launched from ground height over a flat plane, at an angle of 50 degrees above the horizontal with an initial speed of 100 m/s. What is the initial velocity of the projectile parallel to the ground (in the x direction) and perpendicular to the ground (in...

*September 8, 2014*

**American History**

The Whiskey Rebellion A. caused the formation of the Democratic Societies. B. unified northern merchants and southern farmers. C. led to the development of two distinct political groups. D. created a single party political system. C?

*September 8, 2014*

**English**

The military because they give up their lives to fight for us.

*September 8, 2014*

**Physics**

Two ping-pong balls each have a mass of (1.4x10^0) g and carry a net charge of (3.99x10^0) μC. One ball is held fixed. At what height should the second ball be placed directly above the fixed ball if it is to remain there?

*September 7, 2014*

**physics**

A spacecraft of mass 3.5 x 102kg was moving at 1.5 x 102ms-1 when its motor, operating at 8.4 x 102 kW fired for 5.0s Find the new velocity acquired by the spacecraft I don't know how to find the new velocity i found the work Power = w/t 840 x 5 = W 4200J = W Dont know ...

*September 6, 2014*

**Physics**

You toss a tennis ball straight upward. At the moment it leaves your hand it is at a height of 1.5 m above the ground, and it is moving at a speed of 8.0 m/s. (a) How much time does it take for the tennis ball to reach its maximum height? (b) What is the maximum height above ...

*September 6, 2014*

**Chemistry**

5.00

*September 6, 2014*

**math**

I don't now.

*September 3, 2014*

**marketing**

3. Now that we have discussed the concept of being customer oriented, let's discuss MARKETING ORIENTATION. Customer oriented practices are just one small piece of operating with a market orientation. Describe what market orientation means, and how you see that it differs ...

*September 1, 2014*

**marketing**

Many companies claim that they are customer-oriented, but their customer service leaves a lot to be desired. Why do you think this is the case?

*September 1, 2014*

**marketing**

How does the marketing relate to your own experiences and beliefs? Which information do you find particularly interesting and/or useful? Is there anything surprising to you in what you learned?

*September 1, 2014*

**physics**

Three point charges are fixed in place in a right triangle. What is the electric force on the q = -0.7 µC charge due to the other two charges? (Let Q1 = +0.79 µC and Q2 = +1.5 µC.)

*September 1, 2014*

**English/Grammar**

5. S/V/IO/DO 6. S/V/DO 8. S/V/IO/DO 9. S/V/IO/DO

*August 31, 2014*

**English/Grammar**

Can someone tell me if I did them correctly? 1. He followed the map to the treasure. 2. Darcy sang the song slowly. 3. They were certain about the time. 4. I called him a sucker. 5. I found the puppy a home. 6. He answered the question incorrectly. 7. The president gave the ...

*August 31, 2014*

**Chemistry**

new volume will be 1.440 + 0.567 in Litres or 1440 + 567 in mL

*August 31, 2014*

**Chemistry**

I am unsure how to write hypotheses for my experiments for pH, salinity using tirration(agno3), turbidity, conductivity of water samples. The teacher wants the hypothesis in this format Hypothesis format - If (relationship between independent variable and dependent variable) ...

*August 31, 2014*

**Chemistry**

What is the pH of a solution prepared by dissolving 1.23g of 2-nitrophenol (FM 139.11) in 0.250 L? Well so, i calculated the no.moles of 2-nitrophenol, and divided it by 0.250, to get the molarity which was 3.53E-2. Since the molar ratio of dissociation is 1:1, i assumed [H+] ...

*August 31, 2014*

**math**

1645; 1815

*August 29, 2014*

**chemistry**

a solution is prepared by mixing 1.0 grams of benzen(c6h6) in 100g of water to create a solution total volume of 100ml.calculate the molarity,mass percent,mole fraction and molarity of benzene in the solution

*August 26, 2014*

**biochemistry**

Calculate the mass of alanine and the volume of HCl required to prepare 1 litre of 0.1mol/litre buffer with pH of 2

*August 24, 2014*

**english**

Oladudah equiano wrote

*August 23, 2014*

**Physics**

Thank you :)

*August 22, 2014*

**Physics**

1.)A force of 250 is just sufficient to start a 50 kg steel trunk moving across a wooden floor. Find the coefficient of static friction. 2.) compute the acceleration of the block sliding down a 30 deg inclined plane if the coefficient of kinetic friction is 0.20.

*August 22, 2014*

**logical and critical reasoning**

Regardless of what Jim says, baseball is a more refined sport than ice hockey. This is so because more refined people watch baseball rather than ice hockey. You can tell which people are more refined simply by the fact that they prefer the more refined sport to the less ...

*August 21, 2014*

**logical and critical reasoning**

The second proposition is this: an action done from duty has its moral worth, not in the purpose that is to be attained by it, but in the maxim according to which the action is determined. The moral worth depends, therefore, not on the realization of the object of the action, ...

*August 21, 2014*

**Math**

I don't know how to answer this. If 10% of a number is 2 less than 20% of the same number, then 80% of the number equals_______.

*August 21, 2014*

**biology**

Bacteria, Plants

*August 19, 2014*

**Algebra**

To convert miles per hour to feet per second, which conversion factor would not be used? a. 1 hr/60 min b. 1 min/60 sec c. 5280 ft/1 mi d. 1 mi/5280 ft

*August 19, 2014*

**Math**

To convert miles per hour to feet per second, which conversion factor would not be used? a. 1 hr/60 min b. 1 min/60 sec c. 5280 ft/1 mi d. 1 mi/5280 ft

*August 19, 2014*

**Math**

HATS OFF ! Amazing is a less adjective for you. Thank you.

*August 19, 2014*

**Math**

The circumference of a circle is 4 times the circumference of a circle with a radius 1 unit less. What is the radius of each circle?

*August 19, 2014*

**Math**

AMAZING. Thanks Much.

*August 19, 2014*

**Math**

If the radius of a circle is increased by 1 unit, the area of the circle is increased by 16 pi square units. What is the radius of the original circle?

*August 19, 2014*

**math**

The point (-3,4) is on a circle with its center at the origin. Which of the following points must also be on the circle?

*August 19, 2014*

**Trigonometry**

Your horse on a merry-go-round is 18.3 m from the center. Suppose the merry-go-round makes 12.4 rev per ride. If you take 3 rides, through what angle do you move and how many meters do you travel?

*August 15, 2014*

**Trigonometry**

Your horse on a merry-go-round is 18.3 m from the center. Suppose the merry-go-round makes 12.4 rev per ride. If you take 3 rides, through what angle do you move and how many meters do you travel?

*August 15, 2014*

**english**

Thank you Menna!

*August 15, 2014*

**math**

A group of 21 people went to the country fair with 9 people on a stagecoach and 3 people in each buggy. On the return trip, 4 people rode in each buggy. How many people returned on the stagecoach?

*August 14, 2014*

**math**

In a Sing Thing, the first 4 singers sand song 1, the next 4 sand Song 2, and so forth. Song number 73 sang Song? A. 18 B. 19 C. 20 C. 73 I got 15 but I don't know.

*August 12, 2014*

**math**

THANKS

*August 12, 2014*

**math**

To the nearest 1%, what percent of the 12 months have 31 days? A. 75% B. 70% C. 58% D. 50%

*August 12, 2014*

**math**

If ray BD bisects right angle ABC, the measure of angle ABD is?

*August 12, 2014*

**Precalculus**

Let a and b be real numbers. Describe the graph of r = a(cos(theta)+b) as much as possible. (The intent of this question is to get as specific a description as possible that holds for all possible values of a and b. For example, if the question was to describe the graph of x^2...

*August 9, 2014*

**math**

The ratio of boys to girls in a class room was 9:8. Half of the girls left the classroom, and then there were 15 more boys than girls. A. How many children were in the classroom in the beginning B. How many girls left the classroom?

*August 7, 2014*

**math**

The base of a triangle is 11. The other two sides are integers and one of the sides is twice as long as the other. What is the shortest possible length of a side of the triangle?

*August 7, 2014*

**Chemistry**

60g/1.42g/ml= 42.25ml Molarity concentrated sol= .060/63*1/42.25= 2.25 so you want to dilute it 2.25/1 times, which means one part concentrated HNO#, 1.25 part water. One part is 2ml, so 1.25 part water is 2.50ml First, the pure acid is what molarity? 1.42 x 1000 x 0.70 x (1/...

*August 7, 2014*

**math**

A jar contains 20 marbles: 4 red, 6 white and 10 blue. If you remove 1 marble at a time, randomly, what is the minimum number that you must remove to be certain that you have at least 2 marble of each color? I guessed the answer was 18 and it was correct but I don't know ...

*August 6, 2014*

**math**

In the z transformation formula, z = (x – M)/s the x stands for __________. (Points : 1)

*August 3, 2014*

**math**

Of the books in a library, 1/3 came from Robbie's collection and 15 came from Marta's. Of the rest, 15 were Elena's 1/5 were Winfield's, and 5 were purchased from the bookstore. How many book are there in the library?

*July 30, 2014*

**math**

How many quarts of water must be added to 18 quarts of a 32% alcohol solution to dilute it to a solution that is only 12% alcohol.

*July 30, 2014*

**math**

Avery paid $168 on a cell phone. What was the original price of the phone if he got it at a 30 percent discount?

*July 30, 2014*

**math**

Mrs. Richmond bought some apples and pears in the ratio 3:5. After she gave away 3/5 of the apples and 40 pears, the ratio of apples to pears became 2:5. An apple costs 30 cents. A pear costs 15 cents more than an apple. How much did Mrs. Richmond pay for the fruit?

*July 28, 2014*

**math**

The square of a certain whole number N is N squared. If 60 is a factor of N squared, its possible that __ is not a factor of N squared.

*July 28, 2014*

**PHI 208 final exam**

hope

*July 27, 2014*

**math**

ya don't say. I got the answer 2D+40c. but the answer key said it was 2D+.4c

*July 27, 2014*

**math**

The charge for renting a rowboat on Loon Lake is D dollars per hour plus c cents for each minute into the next hour. How many dollars will Mr.Wilson pay if he used a boat from 3:40 P.M. to 6:20 P.M.

*July 27, 2014*

**chemistry**

1-Dinitrogen tetroxide (N2O4) dissociates according to the equation: N2O4 ⇌ 2NO2 An equilibrium reaction mixture at 25 ºC was found to have the partial pressure of N2O4 as 72 kPa whilst the partial pressure of nitrogen dioxide (NO2) was 29 kPa. Calculate Kp for the ...

*July 27, 2014*

**math**

A box contains 4 red cards, 6 blue cards, and 10 green cards. What is the smallest number of cards we must remove from the box to make sure that we have 2 cards of the same color?

*July 27, 2014*

**math**

The difference between one half of a number and one fifth of it is 561. Find the number.

*July 24, 2014*

**math**

2 triangles of the same shape are always A) similar B) equilateral C) congruent D) symmetrical E) equal

*July 24, 2014*

**math**

1/a is a fraction. 1 is the numerator and a is the denominator. you need to plug in for a but I don't know how to solve it

*July 24, 2014*

**math**

a= 1/a, then a squared=?

*July 24, 2014*

**math**

The lengths of the diameters of two concentric circles are 6 and 8. What is the distance between the circles?

*July 24, 2014*

**math**

The cost of mailing a package is c cents for the first b ounces and d cents for each additional ounce. find the cost, in cents, for mailing a package weighing f ounces if f is more than b

*July 24, 2014*

**Algebra**

2.5

*July 23, 2014*

**math**

If 25 times were moved from Box A to Box B, there would be an equal number of dimes in both boxes. If 100 dimes were moved from Box B to Box A, the ratio of dimes in Box A to Box B would be 7:2. What was the original number of dimes in Box A?

*July 21, 2014*

**Trigonometry**

oN A LEVEL GROUND, A 5FT. PERSON AND A FLAGPOLE CAST SHADOWS OF 10 FEET AND 60 FEET RESPECTIVELY. WHAT IS THE HEIGHT OF THE FLAGPOLE?

*July 21, 2014*

**Trigonometry**

On a level ground, a 5 ft. person and a flagpole cast shadows of 10 feet and 60 feet respectively. What is the height og the flagpole?

*July 21, 2014*

**chemistry**

4. Calculate the Gibbs’ free energy change for the reaction Mg(s) + H2O(g) → MgO(s) + H2(g) carried out at 100ºC given the data below. Under these conditions is this reaction product favoured? ΔHºformation (kJ mol^-1) MgO(g) -602 H2O(g) -242 H2(g) 0 ...

*July 19, 2014*

**chemistry**

3. Calculate the standard entropy change for the reaction: N2 + 3H2 → 2NH3 given the standard entropies Sº(N2)(g) = 191.6 J K^-1 mol^-1 Sº(H2)(g) = 130.6 J K^-1 mol^-1 Sº(NH3)(g) = 193.3 J K^-1 mol^-1

*July 19, 2014*

**chemistry**

2. Calculate the enthalpy change of combustion for ethene gas (C2H4) given the following enthalpy changes of formation: ΔHºf(C2H4)(g) = +52 kJ mol^-1 ΔHºf(CO2)(g) = -394 kJ mol^-1 ΔHºf(H2O)(g) = -286 kJ mol^-1

*July 19, 2014*

**chemistry**

1. Calculate the standard enthalpy change for the reaction: C2H4(g) + H2(g) → C2H6(g) given that the enthalpy of combustion for the reactants and products are: ΔHºc(C2H4)(g) = -1411 kJ mol^-1 ΔHºc(C2H6)(g) = -1560 kJ mol^-1 ΔHºc(H2)(g) = -...

*July 19, 2014*

**math**

Carrie can inspect a case of watches in 5 hours. James can inspect the same case of watches in 3 hours. After working alone for 1 hour, Carries stops for lunch. After taking a 40 minute lunch break, Carrie and James work together to inspect the remaining watches. How long do ...

*July 17, 2014*