Wednesday

May 25, 2016
Total # Posts: 700

**physics**

A 49-kg bungee jumper has fallen far enough that her bungee cord is beginning to stretch and resist her downward motion. Find the force (magnitude and direction) exerted on her by the bungee cord at an instant when her downward acceleration has a magnitude of 7.3 m/s2. Ignore ...
*January 27, 2011*

**physics**

A 1790-kg car is traveling with a speed of 15.6 m/s. What is the magnitude of the horizontal net force that is required to bring the car to a halt in a distance of 78.4 m?
*January 27, 2011*

**AP Calculus**

I'm confused as to how to do part C), I don't remember how to find the second derivative of an implicit differentiation problem!
*January 26, 2011*

**Help Please!**

Charges of −4q are fixed to diagonally opposite corners of a square. A charge of + 5q is fixed to one of the remaining corners, and a charge of + 3q is fixed to the last corner. Assuming that ten electric field lines emerge from the + 5q charge, sketch the field lines ...
*January 24, 2011*

**physics**

A large box whose mass is 20 kg rests on a frinctionless floor. A mover pushes on the box with a force of 250 N at an angle of 35 degrees below the horizontal. What is the acceleration of the box across the floor?
*January 16, 2011*

**economics**

It's D
*December 22, 2010*

**Economics**

Thank you so much. :)
*December 11, 2010*

**Economics**

Topic- Each students will pick three things to write a consumer report on. It's your choice. Compare-For each item that you pick you will need to pick two other items to compare it against. (if you choice restaurants, then you need to pick one, then pick two other ...
*December 11, 2010*

**Trig**

a student says there can only be 360 different rays emanating from a point since there are only 360 degrees in a circle. Is this true? Why or Why not?
*December 10, 2010*

**Physics**

A 0.075 kg ball in a kinetic sculpture moves at a constant speed along a motorized conveyor belt. The ball rises 1.32 m above the ground. A constant frictional force of 0.350 N acts in the direction opposite the conveyor belt's motion. What is the net work done on the ball?
*December 9, 2010*

**Chemistry**

Cesium-137 has a half life of 30.0 years. If initially there are 8.0 kg of cesium-137 present in a sample, how many kg will remain after 60.0 years?
*December 7, 2010*

**Math**

a percentage bar graph is sometimes used like a circle graph. If the bar is 8 cm, how long is each piece?
*December 1, 2010*

**Math**

How can the faces of two cubes be numbered so that when they are rolled, the resulting sum is a number 1 to 12 inclusive and each sum has the same probability?
*November 22, 2010*

**Physics**

Me also
*November 21, 2010*

**Physics**

For a certain transverse wave, the distance between two successive crests is 3.11 m, and 5 crests pass a given point along the direction of travel every 12.16 s. Calculate the wave speed.
*November 21, 2010*

**Chemistry**

Two samples of water of equal volume are put into two dishes and kept at room temperature for several days. The water in the first dish is completely vaporized after 2.8 days while the water in the second dish takes 8.3 days to completely evaporate.What can you conclude about ...
*November 18, 2010*

**Math**

A man collected $28500 on a loan of $25000 he made 4 years ago. If he charged simple interest, what was the yearly interest rate?
*November 13, 2010*

**Physics**

a skateboarder moving at v = 4.8 m/s along a horizontal section of a track that is slanted upward by 48° above the horizontal at its end, which is h = 0.54 m above the ground. When she leaves the track, she follows the characteristic path of projectile motion. Ignoring ...
*November 11, 2010*

**math**

Please help me do these problems. I dont understand how to do weighted averages. Mrs. Gleason invested a portion of 32000 dollars at 9% interest and the balance at 11% interest. How much did she invest at each rate if her total income from both investments was 3200
*November 9, 2010*

**Physics**

A 0.145 kg baseball pitched at 38.0 m/s is hit on a horizontal line drive straight back toward the pitcher at 55.0 m/s. If the contact time between bat and ball is 3.40×10−3 s, calculate the average force between the ball and bat during contact.
*November 8, 2010*

**physics**

Use the work-energy principle: Wnet=1/2mv^2-1/2mv^2 Initial velocity is zero therefore: Wnet=1/2mv^2 Ans: 4.3 m/s
*November 7, 2010*

**physics**

A 2.99 kg ball is dropped from the roof of a building 161.9 m high. While the ball is falling to Earth, a horizontal wind exerts a constant force of 12.3 N on the ball. How long does it take to hit the ground> The acceleration of gravity is 9.81 m/s2. Answer the units in s...
*November 7, 2010*

**college english**

what are some things I can include in an essay about Hoagland's "City Rat" Please don't reply with links. I can do that myself.
*November 7, 2010*

**fraction**

10 3/5 x 20/25
*October 28, 2010*

**5th grade word problem**

got 5 bithes
*October 26, 2010*

**physics**

is the force exerted by the wall on the person’s hand passive or active?
*October 22, 2010*

**physics**

is the force exerted by the wall on the person’s hand passive or active?
*October 22, 2010*

**physics**

2. Explain how the tension force gets transmitted along from one end of a string to the other. Does the amount of force that gets transmitted depend on how elastic or stretchable the string is? Explain.
*October 22, 2010*

**algebra**

train A and B are traveling in the same direction on parallel tracks. train A is going 80 miles per hour train B is going 84 miles per hour. train A past a station at 2:15 am train B passes at 2:45 am what time will train B catch train A
*October 21, 2010*

**Ap Chemistry**

Find the emf for the cell Cr(s) |Cr3+(aq, 0.37 M) || Pb2+(aq, 0.0095 M) | Pb(s). Answer in units of V I kept getting .55V but it is wrong. Can someone please help me?
*October 21, 2010*

**6th grade math**

Idk I have the same answer on my math ws
*October 21, 2010*

**AP CHEM**

Complete and balance the reaction Al(s) + Pb2+(aq) ! using the smallest possible integers. I got: 2Al(s) + 3Pb2 ==> Al2Pb3 Calculate the standard free energy. Faraday’s constant is 96485 J V · mol Answer in units of kJ/mol. I know the formula is -nFE but when I ...
*October 21, 2010*

**ap chemistry**

Find the emf for the cell Cr(s) |Cr3+(aq, 0.37 M) || Pb2+(aq, 0.0095 M) | Pb(s). Answer in units of V I got .548733V Is this right?
*October 21, 2010*

**ap chemistry**

I got 8*10^-8 Is this correct?
*October 19, 2010*

**ap chemistry**

A solution is prepared in which a trace or small amount of Fe+2 is added to a much larger amount of solution in which the [OH]- is 1.0M*10^-2. some Fe(OH)2 precipitates. the value of Ksp for the salt is 8.0*10^-10. assuming that the hydroxide ion concentration is 1.0M*10^-2 ...
*October 19, 2010*

**ap chemistry**

would the half reactions for Ag(s) |AgCl(s) |Cl−(aq) || Cl−(aq) |Hg2Cl2(s) |Hg(§¤)be Ag+Cl+e==> AgCl 2Cl+3Hg==>Hg2Cl2+Hg+e
*October 15, 2010*

**ap chemistry**

i am having trouble writing the half reactions and the balanced equation for the galvanic cell Ag(s) |AgI(s) | I−(aq) || Cl−(aq) |AgCl(s) |Ag(s)
*October 15, 2010*

**ap chemistry**

Thank you Dr. Bob. with that information I figured out my question.
*October 15, 2010*

**ap chemistry**

is it a double replacement reaction? 2NaNO3 + Hg2Cr2O7
*October 15, 2010*

**ap chemistry**

what is the galvanic cell for the redox reaction between sodium dichromate and mercury(I) nitrate in an acidic solution.
*October 15, 2010*

**calculus**

Find dy/dx by implicit differentiation. sin x = x (1 + tan y)
*October 14, 2010*

**ap chemistry**

A titration. 12.46 mL of KMnO4 are titrated with 25 mL of H2C2O4. The half reaction is 2H2O+H2C2O4 ARROW 2H2CO3+2H+2e-. How do I get the molarity of H2C2O4? PLEASE HELP
*October 11, 2010*

**ap chemistry**

A titration. 12.46 mL of KMnO4 are titrated with 25 mL of H2C2O4. The half reaction is 2H2O+H2C2O4 ARROW 2H2CO3+2H+2e-. How do I get the molarity of H2C2O4? PLEASE HELP
*October 11, 2010*

**chemistry**

Calculate the molarity for 25mL of H2C2O4 in a titration with 12.46mL of KMnO4
*October 11, 2010*

**Chemistry**

Assignment Calculate the pH, pOH, [H+], and [OH] for each of the following solutions. Show all work. (10 Points) Solution Composition of Starting Materials 1 0.10 M acetic acid 2. 5 mL 0.10 M acetic acid + 5 mL wa 3 1 mL 0.10 M acetic acid + 99 mL water 4 5 mL...
*October 11, 2010*

**communication**

the answer is c
*October 7, 2010*

**Physics**

rry leaves home at 4:07 and runs at a constant speed to the lamppost. He reaches the lamppost at 4:11, immediately turns, and runs to the tree. Larry arrives at the tree at 4:22. What is Larry's average velocity during his entire trip, if the lamppost is 363.0 m west of ...
*October 5, 2010*

**algebra word problem**

the difference between 2 numbers is 24. find the numbers if their sum is 88
*October 4, 2010*

**chemistry**

50.0 mL of water is heated from 60 C to 85 C. How much heat was absorbed by the water sample in joule Can anybody help me understand the process or rules to figuring this out? Thanks
*October 3, 2010*

**ap chemistry**

At normal temperature and pressure, air has a density of 0.001184 g/mL. What is the mass of air in a room that is 3.74 m by 3.45 m by 3.93 m? Answer in units of kg.
*October 1, 2010*

**ap chemistry**

Th solution has a density of 1.049g/mL and only 40% of the solution is acetic acid
*October 1, 2010*

**ap chemistry**

i came up with the answer of 419 g
*October 1, 2010*

**ap chemistry**

Calcu- late the mass of pure acetic acid in 440 mL of this solution at 20 C. Answer in units of g.
*October 1, 2010*

**Chemistry**

How many molecules of Cl2 would be formed from the reaction mixture that produces the greatest amount of products? Consider the following reaction: 4HCl(g)+ O2(g)to 2H2O +2Cl2(g)
*September 28, 2010*

**Math broadmoor**

1 2 3 4 5
*September 23, 2010*

**Accounting**

It is stand accounting procedures, or GAAP, to make an adjusting entry to remove the current year’s principle from the long-term liabilities. This entry reduces the long-term liabilities and increases the current liabilities. You are the bookkeeper for Biker’s ...
*September 20, 2010*

**Physics**

A jetliner can fly 6.50 hours on a full load of fuel. Without any wind it flies at a speed of 2.15 102 m/s. The plane is to make a round-trip by heading due west for a certain distance, turning around, and then heading due east for the return trip. During the entire flight, ...
*September 19, 2010*

**math**

describe a real life situation that can be represented by the following: A - (B U C) The U is a union symbol
*September 17, 2010*

**Math**

write 128 in each of the following bases A) five B)two C)twelve
*September 17, 2010*

**Math**

Where do the parentheses go in this equation? 8+3x6-4-1=13?
*September 17, 2010*

**chemistry**

2408
*September 15, 2010*

**math**

i need help on doing 442 mi in 8.5 hr and i dont know how to do it can you help me?
*September 14, 2010*

**Physics**

at what velocity would a snowball melt before it hit the wall at 32 degrees?
*September 14, 2010*

**Math**

call your tutor rather than trying to get someone else to do your course work for you
*September 14, 2010*

**health**

Case Study â€“ Memorial Health System CPOE Implementation Identify at least five indicators of project failure that manifest themselves in this case study. 2. For each of those indicators, describe what you might have done differently to eliminate or minimize ...
*September 13, 2010*

**health**

this is the case study and instead of the landor one i put lack of involvment Case Study â€“ Memorial Health System CPOE Implementation Memorial Health System is an eight-hospital integrated health care system in the Midwestern United States. The health system ...
*September 13, 2010*

**health**

Identify at least five indicators of project failure that manifest themselves in this case study. Are these right ? these are a few i have came up with: organized inertia lack of clarity of pupose lack of landor project status report insufficient leadership support
*September 13, 2010*

**chemistry**

fhdjfhsghjbfdhfegkfh,nbngdbhhfbebfgbhbgherhfjhge aka IONO
*September 12, 2010*

**Science **

in plants the process that happens when sugars break down and give off energy is called
*September 8, 2010*

**Science**

Why do we name hurricanes?
*September 7, 2010*

**Science**

Why do we name hurricanes?
*September 7, 2010*

**math**

xy = 8 y = x + 2
*September 6, 2010*

**math**

solve algebraically x^2 - 2y^2 = 11 y = x + 1
*September 6, 2010*

**math**

simplify 3sqrt-1/8
*September 5, 2010*

**Division**

3y-18/35 divided by y-6/15y
*September 5, 2010*

**math**

You make $ 90000 a year, and you get a 10% raise. Your new salary is $ .??? The next year you get a 10% cut. Your new salary is $ ????. That is ??? % less than your initial salary. How would I go about solving this??
*August 26, 2010*

**college physics**

double the height of H
*August 24, 2010*

**math**

make A 14 dot array that has exactly 2 rows
*August 19, 2010*

**Algebra II**

Two algebra II questions... simple, i believe? give a numerical example to show that subtraction is not commutative. and give a numerical example to show that subtraction is not associative. thanks(:
*August 18, 2010*

**Physics**

A scientist has devised a new method of isolating individual particles. He claims that his method enables him to detect simultaneously the position of a particle along an axis with a standard deviation of 0.12 nm and its momentum component along the axis with a standard ...
*August 16, 2010*

**Physics**

Please help me solve this! The spectrum of the sodium atom is detected in the light from a distant galaxy. If the 590.0 nm line is redshifted to 658.5 nm, at what speed is the galaxy receding from the Earth?
*August 11, 2010*

**Physics**

(a)Assuming that only gravity is acting on it, how far does an electron have to be from a proton so that its acceleration is the same as that of a freely falling object at the Earth’s surface? (b)Suppose the Earth were made up only of protons but had the same size and ...
*July 29, 2010*

**chemistry**

I'd like to know the answer! haha
*July 16, 2010*

**Finance**

On this problem, theres one thing holding me up. $3 = $1(1 + r)^(12/3) What is r? I cant get it. I even had a sample problem along the same lines and couldnt get that on.
*July 10, 2010*

**Finance**

Suppose an investment offers to triple your money in 12 months (don't believe it). What rate of return per quarter are you being offered?
*July 10, 2010*

**Finance**

You have just won the lottery and will receive $1,000,000 in one year. You will receive payments for 30 years, which will increase 5 percent per year. The appropriate discount rate is 8 percent. What is the present value of your winnings?
*July 10, 2010*

**physics**

I'm having trouble with question 2, please help The velocity of an object in simple harmonic motion is given by v(t)= -(0.275 m/s)sin(23.0t + 2.00π), where t is in seconds. 1) What is the first time after t=0.00 s at which the velocity is -0.100 m/s? 2) What is the ...
*June 13, 2010*

**Physics**

Thanks, I see how it's done. For question 2, I did: x = dv/dt = 0.275*cos(23t) = 0.275*cos(0.372rad) = 0.256 m which is incorrect for some reason.
*June 12, 2010*

**Physics**

The velocity of an object in simple harmonic motion is given by v(t)= -(0.275 m/s)sin(23.0t + 2.00π), where t is in seconds. 1) What is the first time after t=0.00 s at which the velocity is -0.100 m/s? 2) What is the object's position at that time? I tried solving ...
*June 12, 2010*

**Physics**

Nevermind I figured it out... :)
*June 12, 2010*

**Physics**

Two blocks of masses M and 5M are placed on a horizontal, frictionless surface. A light spring is attached to one of them, and the blocks are pushed together with the spring between them, as seen in the figure below: img404.imageshack.us/img404/8349/sbpic0906.png 1) A cord ...
*June 12, 2010*

**math**

I appreciate all of your help. We had about 77 of these problems to do. These are the LAST two problems that I need some help on. Thank you so much for everything. 1/x-1 minus 2/x^2-1= -1/2 2/y plus y-1/3y= 2/5
*May 1, 2010*

**Math**

I appreciate all of your help. We had about 77 of these problems to do. These are the LAST two problems that I need some help on. Thank you so much for everything. 1/x-1 minus 2/x^2-1= -1/2 2/y plus y-1/3y= 2/5
*May 1, 2010*

**math**

Thank you!!
*May 1, 2010*

**math**

solve each equation: x over x+1 plus 2= 3x over x+2
*May 1, 2010*

**math**

Thank you!!
*May 1, 2010*

**math**

Solve each equation: 11/3v+2 minus 3/4= 5 over 3v+2
*May 1, 2010*

**math**

I appreciate your help. This is the last problem that I need help with today. The answer is suppose to be -1/4 3x/x+1=5x over x-1 -2
*April 30, 2010*

**math**

Solve the equation: Thank you 2/y + y-1/3y= 2/5
*April 30, 2010*