# Posts by Kelly

Total # Posts: 1,739

**Physics**

A 11.0-g bullet is fired horizontally into a 101-g wooden block that is initially at rest on a frictionless horizontal surface and connected to a spring having spring constant 160 N/m. The bullet becomes embedded in the block. If the bullet-block system compresses the spring ...

*November 11, 2012*

**chemistry**

_A2(SO3)3+_NaOH->_Na2SO3+_Al(OH)3 if you start with 389.4 g of Al2(SO3)3 and you produce 212.4 g of Na2SO3, what is your percent yield for this reaction?

*November 10, 2012*

**chemistry**

_H3PO4+_KOH->_K3PO4+_H2O if 49.0 g of H3PO4 is reacted with excess KOH, determind the percent yield of K3PO4 if you produce 49.0 g of K3PO4.

*November 10, 2012*

**chemistry**

1K2PtCl4+2(NH3)->1Pt(NH3)2Cl2+2KCl what is the percent yield, when 34.5 grams of NH3 react with excess K2PtCl4 if 76.4 g of Pt(NH3)2Cl2 are actually produced?

*November 10, 2012*

**Calculus**

what happens to the 2 in e^2x? do u bring it down?

*November 9, 2012*

**Calculus**

Find the solutions of the exponential equation e^2x–4e^x+3=0 x1=? x2=?

*November 9, 2012*

**physics**

While fishing, you get bored and start to swing a sinker weight around in a circle below you on a 0.31- piece of fishing line. The weight makes a complete circle every 0.70 . What is the angle that the fishing line makes with the vertical? Express your answer using two ...

*November 7, 2012*

**Chemistry**

a 9.85 g sample of an unknown metal M is burned in the presence of excess oxygen, producing the oxide M2O3 (s) and liberating 57.8kJ of heat at constant pressure. What is the identity of the metal? 4M(s) + 3O2(g) yields 2M2O3(s)

*November 4, 2012*

**Calculus**

Let f(x) = 1/(x+2) and g(x)= (x-1)/x. Simplify and state the domain. f(g(x)) g(f(x))

*October 29, 2012*

**Poem Help**

so the correct answers for this quick check, which I just took, are: 1. b 2. c 3. a 4. d

*October 29, 2012*

**Poem Help**

4 is d

*October 29, 2012*

**calculus**

lim (x^(2)-4)/(x-2) x->2 lim x->1 (x+1)/(x-1)

*October 27, 2012*

**Chemistry**

Running at a rate of 6 mi/h uses 704 Calories in an hour. Convert this value to (a) calories; (b) kilocalories; (c) joules; (d) kilojoules.

*October 25, 2012*

**math**

The products of 5x4 (20) and 1x4 (4)added together (20+4=24)is one half the product of 6x8 (48). If you double the sum of 20+4 (24) you will get 48 (24+24=48 or 24x2+48).

*October 23, 2012*

**Programming Logic**

Shemrock Inc. is a brake pad manufacturing company. This company uses raw materials, such as carbon powder, iron, ash, and resin. It wants to develop an inventory management system that will have the following features: 1.The system should store the current inventory levels ...

*October 23, 2012*

**chemistry**

Complete and balance the molecular equation, including phases, for the reaction of aqueous ammonium bromide, NH4Br, and aqueous lead(II) acetate, Pb(C2H3O2). Enter the balanced net ionic equation, including phases, for this reaction.

*October 23, 2012*

**chemistry**

A certain weak base has a Kb of 9.00 × 10-7. What concentration of this base will produce a pH of 10.34?

*October 21, 2012*

**lens surface**

A spherical generator is used to produce a -15.00D surface on glass of refractive index 1.80. The diameter of the cutting tool is 80mm and the radius of the cutting surface is 4mm. What is the angle between the axis of the tool and the axis of the lens? Do I calculate the ...

*October 18, 2012*

**Chemistry**

What is the concentration of Cu2+ in a solution that is 0.10 M Cu(NH3)4^2+? (Kf = 1.2 x 10^12) The answer is 8.0 x 10^-4 How do I solve the problem to get the answer

*October 14, 2012*

**physics**

If an automobile engine delivers 48.2 hp of power, how much time will it take for the engine to do 6.80 ✕ 105 J of work? (Hint: Note that one horsepower, 1 hp, is equal to 746 watts.)

*October 12, 2012*

**Physics**

A dockworker loading crates on a ship finds that a 22-kg crate, initially at rest on a horizontal surface, requires a 80-N horizontal force to set it in motion. However, after the crate is in motion, a horizontal force of 59 N is required to keep it moving with a constant ...

*October 9, 2012*

**Physics**

A dockworker loading crates on a ship finds that a 22-kg crate, initially at rest on a horizontal surface, requires a 80-N horizontal force to set it in motion. However, after the crate is in motion, a horizontal force of 59 N is required to keep it moving with a constant ...

*October 9, 2012*

**Physics**

A crate of mass m = 31 kg rides on the bed of a truck attached by a cord to the back of the cab as in the figure. The cord can withstand a maximum tension of 82 N before breaking. Neglecting friction between the crate and truck bed, find the maximum acceleration the truck can ...

*October 9, 2012*

**physics**

Betty Bodycheck (mB = 51.4 kg, vB = 22.0 km/h in the positive x-direction) and Sally Slasher (mS = 42.4 kg, vS = 28.0 km/h in the positive y-direction) are both racing to get to a hockey puck. Immediately after the collision, Betty is heading in a direction that is 76.0° ...

*October 8, 2012*

**please help!**

I'm having trouble with this word problem. Two friends Jodi and Abe go horseback riding on the same trail in the same direction. Jodi's horse travels at 5 miles per hour while Abes horse travels at a slower pace. After 2 hours they are 2 miles apart. Find Abes horse ...

*October 5, 2012*

**math**

to estimate how many more people live in Atherton than Needles, which is closer to the exact answer: rounding to nearest hundreds or thousand

*October 4, 2012*

**Is this right?**

I have to determine the slope and y- intercept of this equation then graph 4x=6y+9 so I ended up putting it in y-mx+b form and it was 6y=4x+9 so slope is 4x and y intercept is 6y? How would I graph it though?

*October 3, 2012*

**math**

use the orden of operation and the digit 4 four time to write problems that have the following answers 44

*October 1, 2012*

**Math**

Expression for the square of one more than a number

*October 1, 2012*

**Math**

-8(t-3)-(t+1)=6

*September 24, 2012*

**Physics**

A baseball is hit so that it travels straight upward after being struck by the bat. A fan observes that it takes 3.20 s for the ball to reach its maximum height.

*September 21, 2012*

**Physics**

A ball is thrown vertically upward with a speed of 15.0 m/s. (a) How high does it rise? (b) How long does it take to reach its highest point? (c) How long does the ball take to hit the ground after it reaches its highest point? (d) What is its velocity when it returns to the ...

*September 21, 2012*

**Physics**

In 1865, Jules Verne proposed sending men to the Moon by firing a space capsule from a 220-m-long cannon with final speed of 10.97 km/s. What would have been the unrealistically large acceleration experienced by the space travelers during their launch? (A human can stand an ...

*September 21, 2012*

**Physics**

A steam catapult launches a jet aircraft from the aircraft carrier John C. Stennis, giving it a speed of 205 mi/h in 3.00 s. (a) Find the average acceleration of the plane. (b) Assuming the acceleration is constant, find the distance the plane moves.

*September 21, 2012*

**Physics**

The average person passes out at an acceleration of 7g (that is, seven times the gravitational acceleration on Earth). Suppose a car is designed to accelerate at this rate. How much time would be required for the car to accelerate from rest to 59.1 miles per hour?

*September 20, 2012*

**Physics**

A tortoise can run with a speed of 0.13 m/s, and a hare can run 20 times as fast. In a race, they both start at the same time, but the hare stops to rest for 4.0 minutes. The tortoise wins by a shell (35 cm). (a) How long does the race take? (b) What is the length of the race?

*September 20, 2012*

**Physics**

A motorist drives north for 40.0 minutes at 61.5 km/h and then stops for 15.0 minutes. He then continues north, traveling 130 km in 1.70 h. (a) What is his total displacement? (b) What is his average velocity?

*September 20, 2012*

**health**

i think its B.

*September 18, 2012*

**Math**

1.d 2.a 3.c 4.b

*September 13, 2012*

**science**

I need helping locating information about the environment of Costa Rica so that I can analyze data about the country.

*September 9, 2012*

**HSM/270**

Last few weeks of class and struggling to keep up to graduate, can somebody help me if they have done this before, also i used the PEACE Program for my assignments in this Grant Proposal and Writing class. Thanks Identify where the program planning and evaluation process can ...

*September 8, 2012*

**english**

Was this answer correct?

*September 7, 2012*

**math**

What are the step to help solve for 5r+30/20= 3r-36/3

*September 7, 2012*

**math**

How to write the ration as a fraction in lowest terms. Compare in hours. 22 hours to 3 days. The ratio is __.

*September 7, 2012*

**math**

The distance between city A and city B is 500 miles. On a certain wall map, this is represented by a length of 2.3 feet. On the map, how many feet would there be between city C and city D, two cities that are actually 800 miles apart? On the map, city C and city D are ___ feet...

*September 7, 2012*

**math**

If 5 sweaters cost $39.40, how much would 8 sweaters cost? The cost is $__.

*September 7, 2012*

**math**

Write the ratio as a fraction in lowest terms. compare in inches. 3ft to 31 inches. The ratio is__.

*September 7, 2012*

**math**

The sum of the measures of the angles of any triangle is 180 degrees. In triangle abc, angles a and b have the same measure, while the measure of angle c is 78 degrees larger than each of a and b. What are the measures of the three angles? angle a is __degrees.

*September 7, 2012*

**math**

If planet I is 31.8 million miles from the sun than planet II, then planet III is 25.6 million miles father from the sun than planet I. When the total of the distances for these three planets from the sun is 200.2 million miles, how far away from the sun is planet II? Planet ...

*September 7, 2012*

**math**

An electrician cuts a 26ft piece of wire into two pieces. One piece is 4ft longer than the other. How long are the pieces? What is the length of the shorter piece?__ft

*September 7, 2012*

**Comunication Skills**

Cultural history.

*September 7, 2012*

**Math**

Evaulate each expression: (-1/8)^1/3 Would you make it 3 square root of -1/8? I don't know how to go from there. (256/81)^1/4 Same thing, would it become 4 square root (256/81)?

*September 6, 2012*

**Math**

Factor out the common factor: −3x^4 y^2 + 18xy^3 + 9xy^4

*September 5, 2012*

**Math**

Factor the trinomial: 2x^2 +11x - 63

*September 5, 2012*

**ENGLISH**

yup! all were right! thanks so much!!:)

*September 5, 2012*

**Algebra**

The first two please

*August 30, 2012*

**Algebra**

please help me solve my homework with all the work involved. i have trouble paying attention in class so it's hard for me to do my homework. here are a few of the questions. I need to find out what the letters equal. 1.) 10(-4+y)=2y 2.)9(b-4)-7b=5(3b-2) 3.)-(8n-2)=3+10(1-...

*August 30, 2012*

**Math.**

A spinner is divided into 8 equal sections. There are 3 yellow sections and 5 green sections. The spinner is spun 32 times. Which proportion can be used to find the number of times, B, that the spinner could be expected to land on a green section?

*August 23, 2012*

**English**

Opps I mean dedicate*

*August 10, 2012*

**English**

I am writing a paragraph about why I want to participate in this school counsil thing and I was wobderi if the word choice for "deticate" in this sentence makes sense: I want to deticate myself to participate in more school activities.

*August 10, 2012*

**English**

Is this sentence right? I have never had a pet before.

*August 9, 2012*

**Svience**

I'm just courious what "ragweed mix" is/are. Is it one type of plant or a bunch?

*August 9, 2012*

**history**

the construction of Levitt Towns

*August 9, 2012*

**stats 101**

how do you find the lower class limit,upper class limit, class width, class midpoint, and class boundaries from a set of frequencies data

*July 30, 2012*

**physics**

Two positive charges, each of magnitude 2 10-6 C, are located a distance of 17 cm from each other. (a) What is the magnitude of the force exerted on each charge?

*July 24, 2012*

**health and diseases**

Im not sure how to do it? I need suggestions

*July 14, 2012*

**health and diseases**

I need help on doing a powerpoint presentation about trichomoniasis

*July 14, 2012*

**Chemistry**

I am stuck on this question: what mass of KCl in grams when 2.00 lbs KC10 3 is decomposed?

*July 14, 2012*

**anth**

why is anthropology necessary in a career/life?

*June 25, 2012*

**abnornal psych**

so what are the necessary reason for and aganist establishing a specific disorder related to suicide?

*June 18, 2012*

**abnornal psych**

should suicide be added to the DSM IV- TR and what are the reason for and aganist establishing a specific disorder related to suicide?

*June 18, 2012*

**Math**

If y is directly proportional to x and inversely proportional to z^2, by what value is y multiplied if x is doubled and z is multiplied by 3

*June 18, 2012*

**physics**

You have a mass of 71 kg and are on a 51-degree slope hanging on to a cord with a breaking strength of 165 newtons. What must be the coefficient of static friction to 2 decimal places between you and the surface for you to be saved from the fire? In the previous problem if the...

*June 16, 2012*

**College physics**

A skier traveling at 30.9 m/s encounters a 21.5 degree slope. If you could ignore friction, to the nearest meter, how far up the hill does he go?

*June 16, 2012*

**Physics**

I'm still a little confused. When I use the equation: W = k(x2^2 - x1^2)/2, I get 0.0216 J. This doesn't seem correct.

*June 2, 2012*

**Physics**

A spring with k = 54 N/cm is initially stretched 1 cm from its equilibrium length. (a) How much more energy is needed to further stretch the spring to 2 cm beyond its equilibrium length? (b) From this new position, how much energy is needed to compress the spring to 2 cm ...

*June 2, 2012*

**Chemistry**

Calculate the final pressure on the addition of 2.0 g He(g) to a vessel of 10.0 L fixed volume already containing O2(g) at 25°C and 740 mm Hg

*May 29, 2012*

**Learning through Play**

One of the parents in your school says, “I really enjoyed coming to Parents’ Night last week and seeing all the things the children are doing. I was particularly interested in your comments about the materials which enhance cognitive abilities. Why is it so much ...

*May 25, 2012*

**Calc- Trig Substitution**

integral of dx/square root(x^2-64) My answer is: ln (x/8 + square root(x^2-64)/8) +c is this right?

*May 25, 2012*

**physics**

A model of a helicopter rotor has four blades, each 3.40 {m} in length from the central shaft to the tip of the blade. The model is rotated in a wind tunnel at 580 {rev/min}. What is the radial acceleration of the blade tip, expressed as a multiple of the acceleration g due to...

*May 22, 2012*

**chemistry**

how many times a proton is heavier than an electron

*May 19, 2012*

**Math**

Write an addition problem in which, when the addends are rounded to the nearest ten, the sum is 90. Then explain how you use estimation to solve the problem.

*May 15, 2012*

**physics**

A skydiver jumps out of a hovering helicopter, so there is no forward velocity. Use this information to answer questions 1 to 9. Ignore wind resistance for this exercise. What is the skydiver's acceleration?

*May 11, 2012*

**functions 12**

after i solve for x then that is my answer? so x=1/3,-1

*May 8, 2012*

**functions 12**

so would it be (3sinx-1)(4sinx+4)=0?

*May 8, 2012*

**functions 12**

solve 12cos^2X=8+13sinX between the window of -360 ¡Ü x ¡Ü 360

*May 8, 2012*

**chemistry**

Why are hydrogen ions NEVER found in an aqueous solution?

*May 7, 2012*

**geometry**

the top of a giant slide is 30 ft off the ground. the slide rises at a 30 degree angle. to the nearst whole foot, what is the distance down the slide?

*May 5, 2012*

**Science**

I have a few questions if someone could please help with them: Which of the following is true: A.Relative dating tells us how long ago something existed B.Disconformities are less common but usually far more conspicuous because the strata on either side are essentially C....

*April 27, 2012*

**Chemistry**

A solution of .12 mol/L of phosphoric acid completely neutralizes .20L of a solution of sodium hydroxide with.a concentration of .15mol/L What is the neutralizing volume of the phosphoric acid?

*April 27, 2012*

**ethics**

I am doing a presentation on biomedical issues- abortion. My part is what issues involve problems with consent. Can you help please

*April 26, 2012*

**Earth Science**

Which of the following is true: -Relative dating tells us how long ago something existed -Disconformities are less common but usually far more conspicuous because the strata on either side are essentially -Estimates indicate that the North American continent is being lowered ...

*April 25, 2012*

**Maths lit,geography,life science,pysical science**

Help us plz

*April 23, 2012*

**Chemistry**

Are these right? I didn't know some of them. 1. AgNO3 Soluble, rule 3 2. Ag2SO4 Insoluble, rule 4 3. HgCl2 Insoluble, rule 2 4. BaSO4 Insoluble, rule 4 5. CaCl2 Soluble, rule 2 6. NH4OH ? 7. PbCl4 Insoluble, rule 2 8. Mg(C2H3O2)2 Soluble, rule 3 9. HgCl Soluble, rule 2 10...

*April 23, 2012*

**Chemistry**

how do you determine the solubility of the following salts: 1. AgNO3 2. Ag2SO4 3. HgCl2 4. BaSO4 5. CaCl2 6. NH4OH 7. PbCl4 8. Mg(C2H3O2)2 9. HgCl 10. CaF2 11. CuO 12. AgI 13. Al(OH)3 14. Fe2(CO3)3 15. CrPO4 16. K2S

*April 23, 2012*

**Chemistry**

what are the rules used to determine the solubility of salt?

*April 23, 2012*

**Honors Chemistry**

1. What is the pH of a solution whose [H3O+] is 1 X 10^ -5 M? 2. What is the [H3O+] concentration of a solution with a pH of 9? 3. What is the pH of a solution whose [H3O+] concentration is 3 X 10^-3 M? 4. What is the pH of a solution with a [H3O+] concentration of 1 X 10^ -12...

*April 19, 2012*

**Shurley English**

What are Single Quotes and when do you use them?

*April 17, 2012*

**Phsyics**

A cannonball is fired into the air with a speed of 42 m/s from a height of 28 m, with what speed does the cannonball hit the ground?

*April 16, 2012*