Sunday

February 26, 2017
Total # Posts: 227

**Chemistry **

A 17.7kg piece of zinc at 73 degrees celsius is placed in a container of water. The water has a mass of 23 kg and has a temperature of 13.4 degrees celsius before the zinc is added. what is the final temperature of water?

*February 7, 2017*

**Calculus**

A car traveling 96ft/s begins a negative acceleration at a constant rate of 12ft/s^2. After how many seconds does the car come to a stop? How far will the car have traveled before stopping? Anti-derivatives are involved somewhere in the 2nd part I believe.

*December 16, 2016*

**Math**

You arrive home to find that your 45 foot by 20 foot basement has 3 inches of water in it. A) If 1 cubic foot of water is about 7.48 gallons, how much water will you be pumping out of your basement? Express your answer rounded to the nearest tenth of a gallon. gallons B)If you...

*October 4, 2016*

**Math**

A round silo is 40 feet tall and has a 25 foot radius. How high would a load of 37000 cubic feet of grain fill the silo? Express your answer rounded to the nearest foot.

*October 4, 2016*

**Math**

A model of A car has a scale of 3 cm : 2m the length of the actual hood of the car is 1m what is the length of the hood of the model

*September 11, 2016*

**Math**

Consider an account with an APR of 8.5%. Find the APY with daily compounding.

*August 30, 2016*

**Analytic Geometry**

what is the radius of the circle circumscribing an isosceles right triangle having an area of 162 sq. cm? Show your solutions pls. Thank you!

*June 29, 2016*

**geometry**

can someone answers this please

*May 24, 2016*

**Math**

A man 6 feet tall is standing 4 feet away from a 20 foot lamppost. How long is the lampposts shadow?

*April 27, 2016*

**Chemistry**

The chemistry problem is "How would you make 500.0 mL of a 3.00 M HCl solution form a stock solution that is 6.00 M?" I have no clue how to even approach this problem.

*April 12, 2016*

**math**

An executive traveling at 60 km hr would arrive 10 minutes early for an appointment, whereas at a speed of 45 km hr the executive would arrive 5 minutes early.how much time is there until the appointment?

*March 23, 2016*

**Chemistry**

Dr.Bob222, thank you for the assistance with 1a and 1b, however, I'm kind of confused with 2! What does recipe entail? A description? A series of calculations?

*March 6, 2016*

**Chemistry**

1). Calculate the initial and final pH when 5.0, 10.0, and 100mL of 0.100M HCL is added to (a) 100mL of water (b) 100mL of a buffer which is 1.50M acetic acid and 1.20M sodium acetate 2). Develop a recipe for making this buffer from acetic acid, sodium hydroxide, and water

*March 6, 2016*

**Math**

Tim is mixing blue and white paint to make pale blue paint. He uses 2 quarts of blue for every 3 quarts white. How many quarts of each color would he need to make 35 quarts of pale blue? Is the answer 14 quarts of blue and 21 quarts of white?

*February 29, 2016*

**Physics**

A uniform disk of radius 0.45 m is mounted on a frictionless, horizontal axis. A light cord wrapped around the disk supports a 1 kg object, as shown. When released from rest the object falls with a downward acceleration of 4.5 m/s^2. What is the moment of inertia of the disk? ...

*February 16, 2016*

**English**

"No doubt the feat was easy to Mr. Utterson; for he was undemonstrative at the best, and even his friendship seemed to be founded in a similar catholicity of good-nature." (Stevenson) not plagiarized because you have the name Stevenson and you have quotations to ...

*September 24, 2015*

**Biology**

Answer: The most specific is Genus. A way to remember is King Philip Came Over For Good Sex K = kingdom p = phlym c = class o = order f= family g= genus s= species Moving down from Kingdom to species you get more specific. Species is the most specific.

*September 24, 2015*

**physics**

A stone is thrown straight up from the ground with an initial speed of 26.6 m/s. At the same instant, a stone is dropped from a height of "h" (a variable) meters above ground level. The two stones strike the ground simultaneously. Find the height "h" (a ...

*August 23, 2015*

**math**

A reading list contains 3 historical books and 4 science-fiction books. What is the probability that Tena will randomly choose a historical book for her first report and a science-fiction book for her second?

*July 2, 2015*

**health**

Its important to choose foods that provide more A.carbohydrates B.potassium C.mercury D.cholesterol

*April 11, 2015*

**Physics**

A 1-kg ball initially moving with a speed of 3m/s strikes a stationary 2kg ball head-on. After the collision both balls stick together. What are the final velocities of the two balls?

*April 6, 2015*

**Physics**

A block is released from rest at the top of an incline which makes a 30 degree angle with the horizontal. The incline is 12m long and it takes the block 25 seconds to reach the bottom. What is the coefficient of kinetic friction, µk, between the block and the incline?

*February 25, 2015*

**Social Studies help!!!!**

Actually, my test came back telling me that it was railroads. Which doesn't make sense to me... What would the explanation be?

*January 22, 2015*

**Business English**

Identify and correct the errors in the following to create parallel structure: To narrow a web search a. Put quotation marks around a phrase when you want an exact term. b. Many search engines have wild cards (usually an asterisk) to find plurals and other forms of a word. c. ...

*January 18, 2015*

**algebra**

A veterinarian uses 300 feet of chain-link fencing to enclose a rectangular region and also to subdivide the region into two smaller rectangular regions by placing a fence parallel to one of the sides, (a) Write the width w as a function of the length l. w = 1 (b) Write the ...

*November 4, 2014*

**algebra**

The sum of the length l and the width w of a rectangular area is 220 meters. (a) Write w as a function of l. w = (b) Write the area A as a function of l. A = (c) Find the dimensions that produce the greatest area. l = w =

*November 4, 2014*

**algera**

The fuel efficiency for a certain midsize car is given by E(v) = −0.018v^2 + 1.440v + 3.9 where E(v)is the fuel efficiency in miles per gallon for a car traveling v miles per hour. (a) What speed will yield the maximum fuel efficiency? Round to the nearest mile per hour...

*November 4, 2014*

**algebra**

The height in feet of a projectile with an initial velocity of 32 feet per second and an initial height of 240 feet is a function of time in seconds given by h(t) = −16t^2 + 32t + 240. (a) Find the maximum height of the projectile. ______ ft (b) Find the time t when the ...

*November 4, 2014*

**algebra**

The height in feet of a projectile with an initial velocity of 32 feet per second and an initial height of 240 feet is a function of time in seconds given by h(t) = −16t^2 + 32t + 240.

*November 4, 2014*

**algebra**

A piece of pottery is removed from a kiln and allowed to cool in a controlled environment. The temperature (in degrees Fahrenheit) of the pottery after it is removed from the kiln is shown for various times (in minutes) in the following table. Time(min) Temperature (F) 15 2200...

*October 23, 2014*

**algebra**

The rate at which water evaporates from a certain reservoir depends on the air temperature. The table below shows the number of acre-feet (af) of water per day that evaporate from the reservoir for various temperatures in degrees Fahrenheit. Temperature, °F af 40 760 60 ...

*October 23, 2014*

**algebra**

The rate at which water evaporates from a certain reservoir depends on the air temperature. The table below shows the number of acre-feet (af) of water per day that evaporate from the reservoir for various temperatures in degrees Fahrenheit. Temperature, °F af 40 760 60 ...

*October 22, 2014*

**physics**

A construction worker is carrying a load of 40 kilograms over his head and is walking at a constant velocity. If he travels a distance of 50 meters, how much work is being done?

*October 8, 2014*

**algebra**

x2 = −x + 1

*September 14, 2014*

**algebra**

(z − 1)^2 + 4 = 0

*September 14, 2014*

**algebra**

A company has determined that the profit, in dollars, it can expect from the manufacture and sale of tennis racquets is given by P = −0.01x^2 + 130x − 180,000. How many racquets should the company manufacture and sell to earn a profit of $174,900? (Enter your ...

*September 14, 2014*

**algebra**

A model rocket is launched upward with an initial velocity of 200 feet per second. The height, in feet, of the rocket t seconds after the launch is given by h = −16t2 + 200t. How many seconds after the launch will the rocket be 380 feet above the ground? Round to the ...

*September 14, 2014*

**math**

solve v=1/3TTr2h; h

*September 11, 2014*

**math**

A motorboat left a harbor and traveled to an island at an average rate of 11 knots. The average speed on the return trip was 10 knots. If the total trip took 4.2 hours, how far is the harbor from the island

*September 11, 2014*

**math**

How many liters of water should be evaporated from 110 liters of a 12% saline solution so that the solution that remains is a 20% saline solution

*September 11, 2014*

**algebra**

A over 6 - 11=25 what's my answer

*July 4, 2014*

**math**

Write an equation of a line in standard form with a slope of -8 and passing through the point (-10, 2).

*May 6, 2014*

**Calculus**

A rocket fired straight in the air is being tracked by a radar station 3 miles from the launching pad. If the rocket is travelling at 2 miles per second, how fast is the distance between the rocket and the tracking station changing at the moment when the rocket is 4 miles in ...

*April 9, 2014*

**education**

I beleive the answer is, B!

*March 25, 2014*

**education**

Teacher observations are vital to the promotion and maintenance of children's health status because: A. they provide a baseline of typical behavior and appearance of each child. B. teachers have primary responsibility for children's health care while they are attending...

*March 25, 2014*

**Statistic**

should be 3/10

*March 14, 2014*

**social stud. quiz --- check my answers!!!**

If you are from Connections Academy here are the right answers: 1. C 2. B 3. A 4. B 5. C 6. D 7. B 8. C 9. A 10. B

*February 11, 2014*

**math;)**

how did you get 437

*February 9, 2014*

**Help me with this science.**

Yep they are right

*December 10, 2013*

**Physics**

Pi = Initial Pressure (Atmospheres) Pf = Final pressure (Atmospheres) V = Volume n = Moles R = That constant number Ti = Initial Temperature (Kelvins) Tf = Final Temperature (Kelvins) Use the Ideal Gas law. PiV=nRTi & PfV=nRTf ----In the problem, half the gas is removes, so ...

*November 30, 2013*

**Calculus**

Consider the function f(x) whose second derivative is f''(x)=5x+2sin(x). If f(0)=3 and f'(0)=3, what is f(3)?

*November 19, 2013*

**Calculus**

A Norman window has the shape of a rectangle surmounted by a semicircle. (Thus, the diameter of the semicircle is equal to the width of the rectangle.) If the perimeter of the window is 25 ft, find the dimensions of the window so that the greatest possible amount of light is ...

*November 18, 2013*

**Calculus**

Answer the following questions for the function f(x)=(x^3-9x^2+27x-27)/(x^2-6x+8) defined on the interval [-14, 22]. Enter points, such as inflection points in ascending order. A. The function f(x) has vertical asymptotes at _______ and ________. B. f(x) is concave down on the...

*November 5, 2013*

**Chemistry**

How many grams of phosgenite can be obtained from 14.0 g of PbO and 14.0 g of NaCl in the presence of excess water and carbon dioxide?

*November 4, 2013*

**Calculus**

Find the absolute maximum and absolute minimum values of the function f(x)=x^3+6x^2-63x+4 on each of the indicated variables. Enter DNE for does not exist. (A) Interval = [-8,0] Absolute maximum = Absolute minimum = (B) Interval = [-5,4] Absolute maximum = Absolute minimum = (...

*October 29, 2013*

**Calculus**

List the critical numbers of the following function in increasing order. Enter N in any blank that you don't need to use. f(x) = (6x+6)/(5x^2+5x+5)

*October 28, 2013*

**Chemistry**

An 80.0 g sample of a gas was heated from 25 degree C to 225 degree C. During this process, 346 J of work was done by the system and its internal energy increased by 7495 J. What is the specific heat of the gas? J/(g∗C)

*October 22, 2013*

**Chemistry**

In a constant-pressure calorimeter, 65.0 mL of 0.330 M Ba(OH)2 was added to 65.0 mL of 0.660 M HCl. The reaction caused the temperature of the solution to rise from 23.85 °C to 28.35 °C. If the solution has the same density and specific heat as water, what is ΔH ...

*October 22, 2013*

**Calculus**

Use continuity to evaluate. as x approaches 2, lim arctan((2x^2-8)/(3x^2-6x))

*October 22, 2013*

**Calculus**

y = tan^-1(sqrt(5x^2-1)) find dy/dx

*October 21, 2013*

**Calculus**

Suppose f(x) = 3x + 4. What is f^-1(x) and what is (f^-1)'(x).

*October 14, 2013*

**Calculus**

Find the derivative of the function y, below. It may be to your advantage to simplify before differentiating. y = 8x(ln(x)+ln(2))-4x+pi

*October 14, 2013*

**Calculus**

The radius of a circular disk is given as 24 cm with a maximal error in measurement of .2 cm. What is the percentage error?

*October 10, 2013*

**Calculus**

The linear approximation to (1/sqrt(9-x)) at x=0. What is y?

*October 10, 2013*

**Math**

Find the pattern 0.8, 0.4, 0.2, 0.1, ?

*October 2, 2013*

**AP Physics**

F=ma (In rotation problems, centripetal acceleration is equal to V^2/r, where v is the velocity and r is the radius) F=mv^2/r The only force acting on the water bucket is that of gravity (mg). mg=mv^2/r Now we solve for v. g=v^2/r gr=v^2 √gr=v √(9.8)(1.49)=v 14.6 m...

*September 23, 2013*

**Math**

-(5) to the 2nd power

*September 19, 2013*

**chemistry**

what is the density of an object with a mass of 125g and a volume of 176ml?

*September 17, 2013*

**chemistry**

what is the density of an object with a mass of 125g and a volume of 176ml?

*September 17, 2013*

**math**

the temperature is -10 degrees outside. The temperature inside is 72 degrees. what is the difference between the two temperatures?

*September 5, 2013*

**math**

(-0.9)(-0.64)

*September 5, 2013*

**math**

0.05 + -4.74

*September 5, 2013*

**Phyiscs**

A 40,000 kg jet has a force of 3.9×10^3 newtons. what is the acceleration of the jet

*April 3, 2013*

**Chemistry**

3.176

*April 1, 2013*

**7th Grade Social Studies**

U LIED ANGEL U GOT MEH A 2/20

*March 30, 2013*

**Physics**

in a childrens soccer game, one of the children kicks the ball from the ground, giving it an itial velocity of 22m/s a) what height and range does the ball reach? b) How high is the ball 2.25s into flight?

*March 24, 2013*

**Physics**

in a childrens soccer game, one of the children kicks the ball from the ground, giving it an itial velocity of 22m/s a) what height and range does the ball reach? b) How high is the ball 2.25s into flight?

*March 24, 2013*

**Algebra**

What does / Equal in a formula? Such as 2A/3 =8+4A

*March 21, 2013*

**Physics**

same and yea he does this is nuts

*March 16, 2013*

**calculus**

If that is the case, Damon, wouldn't the answer just be 1?

*March 9, 2013*

**probability**

choose a number 1 to 100. What is the probability that the number is not a multiple of 5?

*March 8, 2013*

**Social Studies**

3 5 and 6 are wrong

*February 28, 2013*

**Social Studies**

Im on the same thing

*February 28, 2013*

**Algebra**

In a Quadratic function if -b=-2 and 2a=2/3 do you eliminate the two and x equals negative three or... What would x end up being?

*February 25, 2013*

**6 grade Math**

Should it be 1 1/2

*January 23, 2013*

**6 grade Math**

How do I divide this ... 3 divided by 1/2

*January 23, 2013*

**spanish**

Preparamos because the subject, Sarits y yo, is plural and includes yo. This means that the nosotros conjugation of the verb is needed. Preparan is ellos or ustedes.

*January 4, 2013*

**Calculus**

Find the limit lim x->2 (2x^2 +1)/(x^2 + 6x -4)

*November 30, 2012*

**chemistry**

Use Avogadro's number 6.022 X 10^23.

*October 9, 2012*

**physics**

A 0.73 kg ball is thrown straight up with an initial velocity of 2.50 m/s. Taking the potential energy of gravity to be zero at the height from which the ball is thrown, determine its gravitational potential energy at the balls highest point. Ignore air resistance.

*October 5, 2012*

**physics**

You are planning to build a log cabin in northern Minnesota. You will pull the logs up a long, smooth hill to the building site by means of a rope attached to a winch. You need to buy a rope for this purpose, so you need to know how strong the rope must be. Stronger ropes cost...

*September 27, 2012*

**physics**

You are part of a team to help design the atrium of a new building. Your boss, the manager of the project, wants to suspend a 16.0 kg sculpture high over the room by hanging it from the ceiling using thin, clear fishing line (string) so that it will be difficult to see how the...

*September 27, 2012*

**phsycis**

A tight-rope walker walks across a 30.0 m long wire tied between two poles. The center of the wire is displaced vertically downward by 1.0 m when he is half-way across. If the tension in both halves of the wire at this point is 3675 N, what is the mass of the tight-rope walker...

*September 20, 2012*

**phsyics**

To move a large crate across a rough floor, you push on it with a force F at an angle of 21¨¬ below the horizontal. The mass of the crate is 31 kg, ¥ìs is 0.57, and ¥ìk is 0.45. Find the force necessary to start the crate moving

*September 19, 2012*

**Math**

If you had a new business and you had 30 customers the first week and 55 customers the second week and 80 customers the third week, what would you project for week 4? Explain how you arrived at your answer.

*September 14, 2012*

**physics**

The engine of a 1250 kg car provides a forward directed force of 3,560 N. If the car accelerates at a rate of 2.60 m/s2, what is the total resistive force (wind resistance, friction, etc.) acting on the car?

*September 13, 2012*

**Math**

What is a shortcut for finding the sum of all numbers from 1-99?

*September 11, 2012*

**physics**

The eye of a hurricane passes over Grand Bahama Island in a direction 60.0° north of west with a speed of 36.1 km/h. Three hours later, the course of the hurricane suddenly shifts due north, and its speed slows to 26.9 km/h. How far (in km) from Grand Bahama is the ...

*September 9, 2012*