Wednesday

January 18, 2017
Total # Posts: 127

**chem 1211**

What temperature change must 1.2mol of water undergo if the amount of energy changed is 23.7 J?

*November 13, 2016*

**Math**

If an individual saves $5,700 and elects to place the total dollar amount into a savings account earning 2.75% APR compounded monthly, how much will the original deposit grow to in 12 years?

*July 18, 2016*

**Calculus**

Two ships leave the same port at noon. Ship A sails north at 12 mph, and ship B sails east at 19 mph. How fast is the distance between them changing at 1 p.m.? (Round your answer to one decimal place.)

*May 28, 2016*

**chemistry**

A 15.0 g sample consisting of a mixture of silver nitrate and sodium nitrate is dissolved in water. This aqueous mixture then reacts with aqueous potassium chloride to form 3.97 g of solid. Calculate the percent by mass of silver nitrate in the first mixture.

*May 7, 2016*

**Statistics**

The Acme Candy Company claims that 60% of the jawbreakers it produces weigh more than .4 ounces. Suppose that 800 jawbreakers are selected at random from the production lines. Would it be unusual for this sample of 800 to contain 494 jawbreakers that weigh more than .4 ounces?

*April 9, 2016*

**Math**

A golden bar of metal (5 centimeters by 18 centimeters by 4 centimeters) being transported by armored car is suspected of being fake, made from a less valuable metal with a thin coating of pure gold. The bar is found to have a mass of 2.7 kilograms. if the specific gravity of ...

*February 7, 2016*

**HEALTH PLEASE HELP!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!**

thank you grace!!!!! you helped me too! i answered the questions on my own and then checked my answers with urs and got a 100!!!!!

*November 25, 2015*

**How much?**

How much wood could a wood chuck chuck if a wood chuck could chuck wood? I NEED THE ANSWER ASAP!!

*October 26, 2015*

**Physics**

A 64-kg boy and a 49-kg girl use an elastic rope while engaged in a tug-of-war on an icy frictionless surface. If the acceleration of the girl toward the boy is 3.8 m/s2, determine the magnitude of the acceleration of the boy toward the girl.

*October 12, 2015*

**Calculus and Vectors**

In triangle RST, RS=4, RT=7, and ST=5. Determine the measures of the angles to the nearest degree. I solved correctly for T's angle of 34 degrees. Once I try using the sine law to solve for angle S, I keep getting 78 degrees, when it's supposed to be 102 degrees. I ...

*September 9, 2015*

**physics**

A cart with a mass is of 6 kg rolls across a level surface. The wheels on the cart make the effects of friction negligible. A force of 3.0 N is applied to the cart, describe the carts motion.

*June 14, 2015*

**English**

make it right. #2 doesn't make clear sense since it isn't referring to anything. The correct way to say #2 would be if a person was having a conversation with someone. Ex: Sam: "Hey, Bill. How long far away is the market?" Bill: "About 40 minutes." ...

*May 7, 2015*

**Functions**

Two forest fire towers, A and B, are 20.3 km apart. From tower A, the bearing of tower B is 70 degrees. The ranger in each tower observes a fire and radios the bearing of the fire form the tower. The bearing from tower A is 25 degrees and from tower B is 345 degrees. How far, ...

*March 23, 2015*

**portland state**

62 decreased by twice a number

*March 6, 2015*

**physics**

hen a battery is connected to a 100-Ω resistor, the current is 4.00 A. When the same battery is connected to a 449-Ω resistor, the current is 1.09 A. Find the emf supplied by the battery and the internal resistance of the battery. I know that emf is equal to current ...

*February 19, 2015*

**physics**

when a battery is connected to a 100-Ω resistor, the current is 4.00 A. When the same battery is connected to a 449-Ω resistor, the current is 1.09 A. Find the emf supplied by the battery and the internal resistance of the battery.

*February 19, 2015*

**college Algebra**

thanks immensely. got it

*January 30, 2015*

**college Algebra**

ANemployee is paid a base salary of $2,150 a month plus an 8% commission on all sales over $7,000 during the month. How much must he sell in one month to earn a total of $3,120 for the month/

*January 30, 2015*

**physics**

Soccer player #1 is 7.31 m from the goal, as the figure shows. If she kicks the ball directly into the net, the ball has a displacement labeled . If, on the other hand, she first kicks it to player #2, who then kicks it into the net, the ball undergoes two successive ...

*May 15, 2014*

**physics**

Soccer player #1 is 7.31 m from the goal, as the figure shows. If she kicks the ball directly into the net, the ball has a displacement labeled . If, on the other hand, she first kicks it to player #2, who then kicks it into the net, the ball undergoes two successive ...

*May 15, 2014*

**math**

can you show me the steps required to get the answer to 3-6x+8x=9

*February 25, 2014*

**math**

3-6x+8x=9

*February 25, 2014*

**Tech ed**

the answer is a

*January 16, 2014*

**Math**

How much low fat milk(1%) and whole milk(4%) should be mixed to make 5 gallons of reduced fat milk (2%)?

*October 20, 2013*

**physics**

A 5000kg truck is being pulled up a 15 degree ramp by a cable which is parallel to the surface of the ramp. If the coefficient of friction u between the wheels of the truck and the ramp is 0.100 and the truck is being pulled at a constant velocity, calculate the tension in ...

*October 19, 2013*

**physics**

A 5000kg truck is being pulled up a 15 degree ramp by a cable which is parallel to the surface of the ramp. If the coefficient of friction u between the wheels of the truck and the ramp is 0.100 and the truck is being pulled at a constant velocity, calculate the tension in ...

*October 19, 2013*

**Math**

Find the rate in mph of someone who drove 12 miles in 45 minutes

*October 1, 2013*

**Probability**

How many different committees can be formed from 5 professors, and 15 students. If each committee is made up of 2 professors, and 10 students.

*July 29, 2013*

**Calculus**

45 is wrong

*April 26, 2013*

**Economics**

b) If you were the head of the Japanese Central Bank, how would you respond if your goal was to keep the interest rates at the original equilibrium level (before the increase in the taxes) in the money market?

*April 23, 2013*

**Economics**

b) If you were the head of the Japanese Central Bank, how would you respond if your goal was to keep the interest rates at the original equilibrium level (before the increase in the taxes) in the money market?

*April 23, 2013*

**Economics**

b) If you were the head of the Japanese Central Bank, how would you respond if your goal was to keep the interest rates at the original equilibrium level (before the increase in the taxes) in the money market?

*April 23, 2013*

**Economics**

b) If you were the head of the Japanese Central Bank, how would you respond if your goal was to keep the interest rates at the original equilibrium level (before the increase in the taxes) in the money market?

*April 23, 2013*

**Economics**

b) If you were the head of the Japanese Central Bank, how would you respond if your goal was to keep the interest rates at the original equilibrium level (before the increase in the taxes) in the money market?

*April 23, 2013*

**Economics**

b) If you were the head of the Japanese Central Bank, how would you respond if your goal was to keep the interest rates at the original equilibrium level (before the increase in the taxes) in the money market?

*April 23, 2013*

**college Mathematics**

f(x)= X2- 6x - 8

*April 8, 2013*

**Chemistry**

A swimming pool, 20.0 m 12.5 m, is filled with water to a depth of 3.73 m. If the initial temperature of the water is 18.5°C, how much heat must be added to the water to raise its temperature to 28.5°C? Assume that the density of water is 1.000 g/mL.

*March 27, 2013*

**statistics**

Your program has an RDT&E-funded project scheduled to start in July 2005 which is expected to take 12 months to complete. The project is expected to cost a total of $12 million (then-year dollars), with cost expected to be incurred at a rate of $1 million per month. The ...

*March 21, 2013*

**statistics**

The program plans to acquire a total of 600 end items costing $570 million over a five-year period. The first production contract is to be awarded in FY04. The number of items to be procured (not delivered) each year and their estimated cost (in then-year dollars) is shown ...

*March 20, 2013*

**math**

Your program has an RDT&E-funded project scheduled to start in July 2005 which is expected to take 12 months to complete. The project is expected to cost a total of $12 million (then-year dollars), with cost expected to be incurred at a rate of $1 million per month. The ...

*March 20, 2013*

**MATH**

The life cycle cost of the BLUEBIRD system is $600 million. The program acquisition cost is $400 million and the development cost is $150 million. There are no facilities costs. What is the procurement cost of the BLUEBIRD system? $200 million $150 million $250 million $100 ...

*March 18, 2013*

**Algebra**

Chuck and Dana agree to meet in Chicago for the weekend. Chuck travels 236 miles in the same time that Dana travels 224 miles. If Chuck’s rate of travel is 3 mph more than Dana’s, and they travel the same length of time, at what speed does Chuck travel?

*March 5, 2013*

**Algebra**

A store mixes Kenyan coffee worth $11 per kilogram and Turkish coffee worth $13 per kilogram. The mixture is to sell for $12 per kilogram. Find how much of each should be used to make a 348-kilogram mixture. How many kilograms of the Kenyan coffee should be in the mixture?

*March 5, 2013*

**algebra**

Chuck and Dana agree to meet in Chicago for the weekend. Chuck travels 236 miles in the same time that Dana travels 224 miles. If Chucks rate of travel is 3 mph more than Danas, and they travel the same length of time, at what speed does Chuck travel?

*March 5, 2013*

**college chemistry**

how to make a 1:8 dilution of chemical Y. You have 350 mililiters of chemical Y. how much diluent do you need?

*February 21, 2013*

**MATH&&HELP**

What is the PROCUREMENT cost of this system? Cost Types Cost (in millions) Research/Development $400 Procurement of Prime mission $800 Procurement of support equipment $100 Procurement of Initial Spares $100 Operations & and Support $70,000 Disposal $100 ANWERS! (A). 800 ...

*February 16, 2013*

**Math**

1/2-1/8 WRITE THE ANSWER IN SIMPLEST FORM

*February 6, 2013*

**Math**

Are there more rational or irrational numbers? I am thinking irrational, because the product of a rational and irrational number is irrational. Is this enough of a reason to prove it?

*January 28, 2013*

**Discreet Mathematics**

Part I: Suppose you are developing a statistical database in which information about professional football teams and records are stored. Consider the following 2 sets of data that list football teams and quarterbacks: D = {Jets, Giants, Cowboys, 49’ers, Patriots, Rams, ...

*October 20, 2012*

**stats**

assume that 7 horses are owned by 7 different owners and the other 4 are owned by the same person

*September 20, 2012*

**stats**

that is the only information given

*September 20, 2012*

**stats**

a horse race has 11 entries, assuming that their are no ties what is the probability that four horses owned by one person finish first second third and fourth

*September 20, 2012*

**chem**

.You have an ice cube that is 150 g and is at a temperature of 0°C. You drop the ice into water that is initially at 15ºC and the ice melts. As a result, the water cools of by exactly 1ºC to become 14ºC. How much water was there? In other words, what mass of...

*September 12, 2012*

**automotive repair**

19. In a cylinder block, the opening that the valve head rests in is called the valve A. margin. C. stem. B. seat. D. guide.

*July 25, 2012*

**statistics**

If the city spends $145,000 on promotional expenditures, what will be the projected attendance at 95% confidence level? how to calculate this using excel?

*June 1, 2012*

**Differential Equations**

The boundary value problem Ty"+ ρ(ω^2)y' = 0 , y(0) = 0, y(L) = 0 is the model of the shape Of a rotating string. Suppose T and ρ are constants. Find the critical angular speed ω = ωn for which there is non-trivial solutions.

*April 22, 2012*

**Differential Equations**

Find the charge on the capacitor in an LRC series at t = 0.02 sec when L = 0.05 h, R = 2 Ohm, C = 0.01 farad. The initial conditions are q(0) = 5 C, i(0) = 0 Ampere. Determine the firt time at which the charge on the capacitor is equal to zero. Also, find the current at any ...

*April 22, 2012*

**Differential Equations**

Find the eigenvalues and eigenfunction for the BVP: y ' ' '+ λ2 y ' = 0 , y(0) = 0, y’(0) = 0 and y’(L) = 0

*April 22, 2012*

**Geometry**

a soccer goal is 24 feet wide. point a is 40 feet in front of the center of the goal. point b is 40 feet in front of the right goal post. from which point would you have a better chance of scoring a goal?

*April 10, 2012*

**Math 11**

An investment earning simple interest at a rate of 1.10% per annum for a term of 5 years earned $82.50 in interest. What was the principal?

*April 9, 2012*

**Algebra**

What do you call it when somebody spends 20 years in the 24th row of a theater

*March 28, 2012*

**science**

The half-life of carbon 14 is 5730 years. if a 1 g sample of old carbon is 1/8 as radioactive as 1 g of a current sample, then the age of the old sample is about ___________years. 22,900 17,200 11,500 716

*March 5, 2012*

**physics**

Do your own work and stop looking on the Internet for answers.

*February 6, 2012*

**physics**

A person pushes a 10.0 kg lawn mower at constant speed with a force of 70.0 N directed along the handle, which is at an angle of è = 46.0° to the horizontal

*October 29, 2011*

**algebra**

I NEED HELP SOLVING THIS PROBLEM ,PLEASE EXPLAIN AND SHOW HOW TO SOLVE the answer ."I HAVE 63 LITERS OF HYDROGEN PEROXIDE, HOW MANY TEST TUBES CAN I FILL IF EACH CONTAINED 7/8 OF A LITER?" PLEASE SHOW ME YOUR WORK. AND THANK YOU IN ADVANCED.

*October 11, 2011*

**homework**

ranslate the following situation into an inequality. Do not solve. “Charlie would like to pack one less outfit than Jane for their trip. Loretta would like to bring five outfits less than twice what Jane packs. Due to space in the suitcase, they are limited to a total of ...

*August 30, 2011*

**algebra**

x+1=7

*August 21, 2011*

**alebra**

Solve using the addition principle. x + 1 = 7

*August 20, 2011*

**algebra**

Solve using the addition principle. x + 1 = 7

*August 20, 2011*

**algebra**

x = 3 a solution for 3x – 1 = 6? Write yes or no.

*August 20, 2011*

**chemistry**

Wow... noone ever answered... sorry man..

*July 19, 2011*

**Civics**

Mr. Medicine Man, gets it any time he can. Heheheheheh

*July 6, 2011*

**Math**

Can someone solve this showing the steps involved 4^log2(2^log2 5)

*May 23, 2011*

**math**

Can someone solve this and explain it please 4^log2 (2log2 5)

*May 23, 2011*

**algebra**

Solve the following, then check your answer by graphing. x^2+4y^2=25 y^2-x=1

*April 20, 2011*

**Math**

we are working on a puzzle similar to a magic square. 9 boxes are arranged in an X with the center box being shared by both diagonals. the goal is to use each integer 1-9 one time so that each diagonal sums to 26 and the 4 corners sum to 26. HELP

*March 30, 2011*

**Algebra**

.122

*March 30, 2011*

**chemistry**

What is the pH of a solution prepared by dissolving 6.0 g of HCl in water to make 415 mL of HCl solution?

*March 29, 2011*

**algebra**

Write the equation for this situation: the cost, c, in dollars of a car rental is equal to 10 dollars plus 1/2 the miles driven, m. Then graph the equation and use the graph to determine the cost of the car rental if the number of miles driven is 12. Please show all of your ...

*March 20, 2011*

**Chemistry**

How much lead (Pb) is in 3.01 × 10^12 atoms of lead? Answer in units of mol.

*March 8, 2011*

**math**

How would you set up a system of linear equations to find out how many packages of 8 and 12 you would have to buy to have no left?

*January 11, 2011*

**log graph**

Write the equation for this situation: the cost, c, in dollars of a car rental is equal to 10 dollars plus 1/2 the miles driven, m. Then graph the equation and use the graph to determine the cost of the car rental if the number of miles driven is 12. Please show all of your ...

*November 1, 2010*

**physics**

Consider a frictionless track as shown in the figure below. A block of mass m1 = 5.95 kg is released from A. It makes a head on elastic collision at B with a block of mass m2 = 10.0 kg that is initially at rest. Calculate the maximum height to which m1 rises after the ...

*October 28, 2010*

**math**

I have 28 marbles in all. Red,Blue, Green. 8 of them are blue. I have 3 times as many red marbles than green marbles. How many are red ?

*October 28, 2010*

**physics**

A 35 turn coil of radius 4.9 cm rotates in a uniform magnetic field having a magnitude of 0.53 T. If the coil carries a current of 20 mA, find the magnitude of the maximum torque exerted on the coil.

*October 22, 2010*

**Maths**

Find the La Place Transform of a.) f(t)=t b.) f(x)=y"+2y'+Y

*October 17, 2010*

**Physics**

Consider the circuit shown in the figure below. Use the following as necessary: R1 = 11.00 Ù, R2 = 1.40 Ù, and V = 6.00 V. (a) Calculate the equivalent resistance of the R1 and 5.00 Ù resistors connected in parallel. 1 Ù (b) Using the result of part...

*October 5, 2010*

**Physics**

A lamp (R = 151 ), an electric heater (R = 24 ), and a fan (R = 49 ) are connected in parallel across a 121 V line. What total current is supplied to the circuit? What is the voltage across the fan? What is the current in the lamp? What power is expended in the heater?

*October 4, 2010*

**Physics**

The voltage across an air-filled parallel-plate capacitor is measured to be 219.0 V. When a dielectric is inserted and completely fills the space between the plates as in the figure below, the voltage drops to 64.4 V. What is the dielectric constant of the inserted material? ...

*September 23, 2010*

**Physics**

Consider the system of capacitors shown in the figure below (C1 = 5.00 µF, C2 = 7.00 µF). Find the equivalent capacitance of the system. Find the charge on each capacitor. Find the potential difference across each capacitor. Find the total energy stored by the group.

*September 22, 2010*

**Physics**

A uniform electric field of magnitude 395 N/C pointing in the positive x-direction acts on an electron, which is initially at rest. The electron has moved 3.40 cm. What is the work done by the field on the electron? What is the change in potential energy associated with the ...

*September 22, 2010*

**Physics**

Three point charges, A = 2.2 µC, B = 7.5 µC, and C = -3.9 µC, are located at the corners of an equilateral triangle as in the figure above. Find the magnitude and direction of the electric field at the position of the 2.2 µC charge.

*September 17, 2010*

**physics**

Four closed surfaces, S1 through S4, together with the charges -2Q, Q, and -Q are sketched in the figure below. The colored lines are the intersections of the surfaces with the screen.

*September 17, 2010*

**english**

What is the tone of this article? The trackers mustered at Tex Canyon Road, 20 miles north of the Mexican border, on the afternoon of March 27. There were border-patrol agents, six search-and-rescue units from the Cochise County sheriff's department and dogs trained to ...

*July 16, 2010*

**math**

pppppppp pnpnpnpn pndnpdpn pndqpdpq penny+penny+penny+nickel+dime+dime+quarter+ quarter=3+5+10+10+25+25=78 cents. I think Ms. Sue overlooked the part about every other coin being replaced by nickels.

*December 3, 2009*

**math**

I figured it out before I got your answer, and I used the trig identity sin(t-u)=sin(t)cos(u)-cos(t)sin(u). I ended up having to use four or five more trig substitutions before finally getting to the answer you have there. Your substitution is much easier to compute. Too bad I...

*December 3, 2009*

**math**

I'm trying to find the convolution f*g where f(t)=g(t)=sin(t). I set up the integral and proceed to do integration by parts twice, but it keeps working out to 0=0 or sin(t)=sin(t). How am I supposed to approach it? integral (sin(u)sin(t-u)) du from 0 to t.

*December 3, 2009*

**physics**

A Modified Atwood's machine (the pulley with two mass system used in class on in the Modified Atwood physlet) has a 10.0 N cart on a frictionless, horizontal track with a 10.0 N hanging weight attached to a string connecting the two weights. A second track is set up where ...

*November 18, 2009*

**geography**

Sammy goes out to play. His mother tells him to be home by 5:oo. Sammy is almost an hour late, but he has an excuse. He says that he got lost. He tells his mother that when he checked his compass, it was pointing to the west, so he followed a path in that direction, but still ...

*November 12, 2009*

**Math**

What is the rule _,68,94_,120.

*November 1, 2009*