Tuesday

October 21, 2014

October 21, 2014

Total # Posts: 577

**Physic**

A 290-N sphere 0.20 m in radius rolls without slipping 6.0 m down a ramp that is inclined at 31° with the horizontal. What is the angular speed of the sphere at the bottom of the slope if it starts from rest?
*November 10, 2011*

**math**

If a quarter circle is placed on a square target and the radius of the quarter circle is the same as the length of a side of the square, what is the probability that a dart that hits the square does not hit the quarter circle
*October 26, 2011*

**physics**

The rear window in a car is approximately a rectangle, 1.1 m wide and 0.30 m high. The inside rearview mirror is 0.45 m from the driver's eyes, and 1.45m from the rear window. Part A What is the minimum length for the rearview mirror if the driver is to be able to see the ...
*October 24, 2011*

**Physics**

You are 1.9 m tall and stand 3.3 m from a plane mirror that extends vertically upward from the floor. On the floor 1.6 m in front of the mirror is a small table, 0.75 m high. What is the minimum height the mirror must have for you to be able to see the top of the table in the ...
*October 24, 2011*

**geometry**

Hello, Can some one check my work. I just want to make sure I answered the questions correctly. Thanks, Nikki 1) Every rhombus is a parallelogram. True 2) Every parallelogram is a rectangle. False 3) Every rectangle is a square. False 4) Every square is a rectangle. True 5) ...
*October 19, 2011*

**Chemistry**

Wow....how did I NOT see that...thanks DrBob... :-)
*October 19, 2011*

**Chemistry**

In order to make 1200mL of 2.0 M of sodium hydroxide, NaOH, from 9M NaOH, how many mL of the 9M NaOH should be used?
*October 19, 2011*

**Math **

How is scientific notation used in our daily lives?
*October 13, 2011*

**Physics**

A 2 kg ball of putty moving to the right at 3m/s has a head-on inelastic collision with a 1 kg ball of putty moving to the left at 3m/s. What is the final magnitude and direction of the velocity of the stuck together balls after the collision?
*October 8, 2011*

**Health**

Thanks! The first link was very helpful. :)
*October 8, 2011*

**Health**

What is the average teen suicide rate in the state of New York, as well as the top five reasons (in order) for teen suicides there? Thanks :)
*October 8, 2011*

**Algebra**

Can anyone else help with the problems? Much appreciated :)
*October 8, 2011*

**Algebra**

Hi. I've tried doing these problems and got long decimals that don't make sense. Please help!! 1) 13x + 6=4x-4 2) (1/2)x + 8= 3x + 2 3) (n/3) + 8=n + 1 4) 2n + 3= 2n + 3 I don't know how I would find n in this one!! 5) 5x + 2(2x-1)=-16 Thanks so much for all the ...
*October 8, 2011*

**Algebra**

Thanks! That helped a lot! But now I have more questions...please see my other algebra question, as well as my health question if you can. Thanks!!
*October 8, 2011*

**Algebra**

How do I solve these equations? I was out sick a whole week :( please no direct answers. I want to know the process as well. -a=5 4/5x=20 -2/3y=-18 -x/3=18 Please note that the / are fractions. Thank you so much in advance!! :)
*October 8, 2011*

**math**

1. The cost, in millions of dollars, to remove x % of pollution in a lake modeled by
*October 2, 2011*

**health**

Write a 350- to 700-word paper in which you discuss corrections accreditation and privatization. Address the following questions: • What is corrections accreditation? How does corrections accreditation affect the professional development of corrections officers? How can ...
*October 2, 2011*

**physics**

A car travelling at a constant speed of 136 km/hr passes a tropper hidden behind a billboard. One second after the speeding car passes the billboard, the tropper sets in a chase after the car wit ha constant acceleration of 3.8 m/s^2. How far does the trooper travel before he ...
*September 29, 2011*

**algebra**

Joe has to add 2.9104 g of silver
*September 27, 2011*

**planetary science**

If I'm standing on the sun can I still see the phases of the moon
*September 26, 2011*

**criminal juctice 230**

I have been trying to write this out the best was I can with out running on on to other subject
*September 24, 2011*

**criminal juctice 230**

Prepare a 200- to 300-word response to the following questions: •What is the objective of punishment in the criminal justice system? •How does punishment apply to the overall criminal justice system? •How may punishment assist with achieving institutional ...
*September 24, 2011*

**Calculus **

Can you arrange the digits 1-9, into a 1:2 fraction ( example 1/23+4/56+7/89=1) to equal 1? Only using each number once!
*September 21, 2011*

**College Physics**

Bob has just finished climbing a sheer cliff above a beach, and wants to figure out how high he climbed. All he has to use, however, is a baseball, a stopwatch, and a friend on the ground below with a long measuring tape. Bob is a pitcher, and knows that the fastest he can ...
*September 18, 2011*

**early childhood**

The first language arts skill that children learn is:
*September 14, 2011*

**early childhood**

Preschoolers use private speech to because it's more efficient
*September 14, 2011*

**math**

what does "find each unit rate" mean???
*September 14, 2011*

**physics**

Given that the electric potential is 7.0×10^−2 V higher outside the cell than inside the cell, and that the cell membrane is 0.10 thick, calculate the work that must be done (in joules) to move one sodium ion from inside the cell to outside.
*September 5, 2011*

**geometry**

B is the midpoint of AC. FInd BC if AB=3x-4 and AC=58
*August 31, 2011*

**Physics**

You are riding on a jet ski directed at an angle upstream on a river flowing with a speed of 2.8 m/s. If your velocity relative to the ground is 8.2 m/s at an angle of 25.0° upstream, what is the speed of the jet ski relative to the water?
*August 28, 2011*

**Math**

Identify the property communituve, associaive, or distributive? m+(n+6)=(n+6)+m
*August 21, 2011*

**Math**

Identify the property. X(a-b)= ax- bx
*August 21, 2011*

**geometry**

How many degrees is the base of your scalene triangle if the left leg at 35°and the right leg is 25°?
*August 10, 2011*

**annuaties**

Sally contributed $500 every six months for fourteen years into an RRSP earning interest at 7.5% compounded semi-annually. Seven years after the last contribution Sally converted the RRSP into an RRIF which is to pay her equal quarterly payments for sixteen years. If the first...
*August 1, 2011*

**annuaties**

Mr. Strupp expects to retire in 12 years. Beginning one month after his retirement, he would like to receive $500 per month for twenty years. How much must he deposit into a fund today to be able to do so if the rate of interest on the deposit is 12% compounded monthly?
*August 1, 2011*

**statistics**

a population has mean 15 and standard deviation 5. if 68% of the values in the population are between 10 and 20, the population cannot be normal
*July 11, 2011*

**Statistics**

A statistics professor gives a test and finds that the scores are normally distributed with a mean of 25 (out of 100) and a standard deviation of 5. She plans to curve the scores in one of two ways. 1) She could add 50 points to each grade. 2) She could use the following ...
*July 5, 2011*

**Business**

1. (TCO 9, 2, 3, 7) You have worked for an electronics company for the past three years. You have been assigned the responsibility to create a workbook presenting profits and losses at the company's end of year meeting. It is critical for the workbook to include a ...
*June 23, 2011*

**exp ofmath**

13/14 + 2/9 reduce answer to lowest terms
*June 17, 2011*

**geology**

I need help finding historical disasters associated with past earthquakes
*June 8, 2011*

**algebra**

i am not sure how he got this answer his name is reiny but i need alot more help wit math so someone help me please
*June 6, 2011*

**algebra**

Solve the equation by a method of your choice: 6x2 + 5x + 1 = 0 If there are two solutions, separate the solutions by a comma.
*June 6, 2011*

**Chemistry**

2LiOH + CO2 yields Li2CO3 + H2O will the astronauts survive and how much water is made if there is 2.00 kg LiOh and expel 35kg of CO2?
*June 1, 2011*

**geology**

When astronauts brought back rock samples from the Moon, the minerals present were mostly the same as those found on Earth. Can you think of reasons why this might be so? Would you expect minerals on Mars or Venus to be the same, or at least very similar, to those on Earth?
*May 25, 2011*

**lit**

It's suppose to be incorrect that is why we have to rewrite each sentence correctly and use parallel structure.
*May 19, 2011*

**lit**

Perseverance is an obstacle that involves never giving up, maintaining a positive attitude, and the ability to trust others. how can this be written in parallel structure?
*May 19, 2011*

**science **

the moon's gravity is about one-sixth the gravity on earth. mar's gravity is about one half the gravity on earth. make a bar graph that shows your weight (95 lbs) in newtons on earth, moon, and on mars. A newton is equal to about one quarter of a pound.
*May 12, 2011*

**English**

whom
*May 12, 2011*

**chemistry**

2.50x10 to the second power mL of 0.100M NaBr
*May 11, 2011*

**5th Grade Math**

Once a month a fast food chain offers a special when a coach brings in a team. Buy 5 hamburgers and get one free. This month, a team goes in after their game. Each person had one hamburger. Each of the players had a soda @ $.50 each and shared an order of french fries ($.95 ...
*May 9, 2011*

**Math**

Once a month a fast food chain offers a special when a coach brings in a team. Buy 5 hamburgers and get one free. This month, a team goes in after their game. Each person had one hamburger. Each of the players had a soda @ $.50 each and shared an order of french fries ($.95 ...
*May 9, 2011*

**Chemistry**

How many grams of sodium azide are required to produce 31 grams of nitrogen
*May 3, 2011*

**chemistry**

what is the formula for hydrate copper(II) CHLOride Tetra-hydrate?
*April 27, 2011*

**statistics**

In prior investigations made by a local Gas and Electric Company, 65% of homeowners prefer to heat with gas instead of electricity. In a recent study of 200 homeowners 60% prefer heating with gas. In a two tailed test at a .05 level of significance can we conclude that the ...
*April 26, 2011*

**statistics**

The pew research center recently polled n=1048 u.s. drivers and found that 69% enjoyed driving their cars. In 1991 a poll reported this percent to be 79%. Using the data from this poll ,test the claim that the percent of drivers who enjoy driving their cars has declined since ...
*April 11, 2011*

**statistics**

The pew research center recently polled n=1048 u.s. drivers and found that 69% enjoyed driving their cars. In 1991 a poll reported this percent to be 79%. Using the data from this poll ,test the claim that the percent of drivers who enjoy driving their cars has declined since ...
*April 11, 2011*

**statistics**

The pew research center recently polled n=1048 u.s. drivers and found that 69% enjoyed driving their cars. In 1991 a poll reported this percent to be 79%. Using the data from this poll ,test the claim that the percent of drivers who enjoy driving their cars has declined since ...
*April 11, 2011*

**5th grade Math**

Once a month a fast food chain offers a special when a coach brings in a team. Buy 5 hamburgers and get one free. This month, a team goes in after their game. Each person had one hamburger. Each of the players had a soda @ $.50 each and shared an order of french fries ($.95 ...
*April 7, 2011*

**Physics**

If a gas tap is turned on for a few seconds, someone a couple of meters away will hear the gas escaping long before he or she smells it. What does this indicate about the speed of sound and the motion of molecules in the sound-carrying medium?
*April 6, 2011*

**Physics**

Will a cyclist coast farther if the lamp connected to his generator is turned off? Explain.
*March 30, 2011*

**Physics**

Can an electron at rest in a magnetic field be set into motion by the magnetic field? What if it were at rest in an electric field?
*March 29, 2011*

**Chemistry**

I'm having trouble giving the formula for this coordination compound: sodium diamminetetrachloroplatinate(IV) I think that it has to have a charge because it has Na+ and [Pt(NH3)2Cl4] (which is neutral), but Na[Pt(NH3)2Cl4]+ is wrong. Please help!
*March 26, 2011*

**Chemistry**

Thanks, I got it right!
*March 26, 2011*

**Chemistry**

A saturated solution of Mg(OH)2 is prepared having a large excess of Mg(OH)2. Sn(NO3)2 is added to the solution. Ksp = 1.9 x 10^-11 for Mg(OH)2 and Ksp = 6.0x10^-26 for Sn(OH)2. What [Sn2+] is required so that the [Mg2+] in solution will be 0.15 M?
*March 26, 2011*

**physics**

A student sits at rest on a piano stool that can rotate without friction. The moment of inertia of the student-stool system is 4.6 kg m^2. A second student tosses a 1.5 kg mass with a speed of 2.9 m/s to the student on the stool, who catches it at a distance of 0.40 s from the...
*March 18, 2011*

**physics**

A student sits at rest on a piano stool that can rotate without friction. The moment of inertia of the student-stool system is 4.2 . A second student tosses a 1.1 mass with a speed of 3.0 to the student on the stool, who catches it at a distance of 0.45 from the axis of ...
*March 18, 2011*

**math**

this can also be expressed as 15-20, which equals -5 so, +15 + -20=-5
*March 17, 2011*

**algebra**

36sqrt(2)
*March 17, 2011*

**physics**

Suppose partial melting of the polar ice caps increases the moment of inertia of the Earth from 0.331MR^2 to 0.332MR^2. What is the change in length of day in seconds?
*March 17, 2011*

**physics**

A student sits at rest on a piano stool that can rotate without friction. The moment of inertia of the student-stool system is 4.6 kg m^2. A second student tosses a 1.5 kg mass with a speed of 2.9 m/s to the student on the stool, who catches it at a distance of 0.40 s from the...
*March 17, 2011*

**Literary Analysis and Composition**

can you please tell me if these are right and if not could you please help? Like autobiographies, diaries are usually written in the privacy of one’s room. in the decades after one has important experiences. in the second-person point of view. -in the first-person point ...
*February 16, 2011*

**physical science**

What is Final Velocity? I don't understand it at all!!
*February 2, 2011*

**chemistry**

When copper(II) oxide is heated in the presence of hydrogen gas, elemental copper and water are produced. What mass of copper can be obtained if 22.8 g copper(II) oxide is used?
*January 25, 2011*

**chemistry**

What volume of a 3.00 M KI stock solution would you use to make 0.270 L of a 1.25 M KI solution?
*January 23, 2011*

**Literary Analysis and Composition**

respect for the power and wildness of the natural world. is outwardly embarrassed or clumsy but is a very different man on the inside. joyful animation allowing readers to experience Walter Mitty's daydreams more closely. Some people make up their minds and cannot be ...
*January 20, 2011*

**Literary Analysis and Composition**

could you please help with these questions? In works like "To Build a Fire," Naturalist writers such as Jack London advocated (Points : 5) trusting entirely in the wisdom and ingenuity of human beings. respect for the power and wildness of the natural world. ...
*January 20, 2011*

**MATH**

Which of the following sums is larger and by how much? (n=1) Y1 = 7 over Σ 15/4(pi/10)^n Y2= 11 over Σ 17/4(4/13)^n
*January 20, 2011*

**MATH **

what is the general term of the following series? 60/121-30/11+15-...+219 615/ 16
*January 20, 2011*

**geometry**

how can the slope formula help you remember the equation for the point-slope form of a line?
*January 20, 2011*

**Calculus **

Consider the function f defined by f(x)= sin x/x, x cannot equal 0 1, x cannot equal 0 a) At what points does the graph cross the X-axis? b) What is the relation between f(x) and tan x at points x cannot equal 0 at which f(x)=0? c) What is the behavior of f as the absolute ...
*December 13, 2010*

**physics**

d = __________________ m from where the first pulse originated please help me!!!!!
*December 9, 2010*

**physics**

A 13.5 m long wire of mass 173 g is stretched under a tension of 269 N. A pulse is generated at one end, and 16.5 ms later a second pulse is generated at the opposite end. Where will the two pulses first meet?
*December 9, 2010*

**creative activities in other curriculum areas**

which one of the following methods is preferred for teaching songs from recordings to young children? a-the phrase-wise method b-the whole-song method c-the combination method d-the strong-melody method
*December 6, 2010*

**Chemistry**

Convert: 5.72 kJ to kcal
*December 2, 2010*

**geometry**

a triangle has two sides that have lengths of 14 feet and 22 feet. which of the following lengths could not represent the length of the third side... A 8FT B 12FT C 14FT D 20FT
*November 23, 2010*

**algebra**

To estimate animal populations, biologists count the total number of animals in a small section of a habitat. The total population of animals is directly proportional to the size of the habitat (in acres) polled. Write an equation using only one variable that could be used to ...
*November 22, 2010*

**Algebra 1**

The world record for the mile was 4:10 and 3:49 in 1975. Assuming that the record improves in a linear fashion (which it has so far) write an equation to predict the mile world record (in seconds) for a given year (y=record in seconds, x=year) What should the world record be ...
*November 21, 2010*

**chemistry**

A pH glass/calomel electrode was found to develop a potential of -0.0390 V when used with buffer of pH 5.52. With an unknown solution, the potential was -0.360 V. Calculate the pH of the unknown solution
*November 17, 2010*

**Math**

Can someone please please help me understand how to go about solving this? (not really answering it, but actually explaining it-pretty please?) "The zipper and the safety pin were invented in the 14th century. The safety pin was invented 44 years before the zipper. The ...
*November 10, 2010*

**calculus**

A street light is at the top of a 15 ft tall pole. A woman 6 ft tall walks away from the pole with a speed of 4 ft/sec along a straight path. How fast is the tip of her shadow moving when she is 30 ft from the base of the pole
*November 5, 2010*

**Emergancy help!!!!!!!!! **

Classify the model as exponential growth or exponential decay. Identify the growth or decay factor and the percent increase or decrease per time period. y=16(1.25)^t
*November 4, 2010*

**Math**

y=16(1.25)^t
*November 4, 2010*

**Math**

Classify the model as exponential growth or exponential decay. Identify the growht or decay factor and the percent increase or decrease per time period.
*November 4, 2010*

**chemistry**

what the balanved equation for gaseous sulfur dioxide reacts with water to form aq sulfurous acid (H2SO3)
*November 4, 2010*

**AP Biology**

I have two questions: 1. Why are action potentials usually conducted in only one direction along an axon? A. The axon hillock has a higher membrane potential than the terminals of the axon. B. The brief refractory period prevents reopening of voltage-gated Na+ channels. C. ...
*November 1, 2010*

**chemistry**

Calculate the pH at which the amino group of lysine is 20% dissociated. lysine side chain pka is 10.5.
*October 25, 2010*

**Calculus**

int(dx/(x^2+9)) u = x/3 Use the indicated substitution (above) to evaluate the integral. Confirm answer by differentiation. Okay, so I found that du/dx is 1/3. dx is 3du. Just by looking at the integral I can tell this is some form of tan^-1(x), if we change it to int(1/(x^2+9...
*October 23, 2010*

**Physics Please Help**

A spider sits on its web, undergoing simple harmonic motion with amplitude A.What fraction of each cycle does the spider spend at positions with x>0.75A? Hint: Use the analog of uniform circular motion.
*October 21, 2010*

**Physics Please Help**

A spider sits on its web, undergoing simple harmonic motion with amplitude A.What fraction of each cycle does the spider spend at positions with x>0.75A? Hint: Use the analog of uniform circular motion.
*October 21, 2010*

**US history**

thanks :)
*October 21, 2010*

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