Wednesday

September 28, 2016
Total # Posts: 1,755

**Physics**

A charge of +2uC is placed at one end of a meter stick, a charge of -2uC is placed at the other end. Calculate the electric field strength at the 50 cm mark

*October 17, 2014*

**Math**

Thank You Steve

*October 16, 2014*

**Math**

Would this phrase the quotient of 2 and the sum of a number and 5 be expressed as (4 / 2) + (x + 5)? Any help would be appreciated. Thank You

*October 16, 2014*

**Chemistry**

Should add that this is the question as well, sorry: "Calculate the absorbances and using this and the measured molar absorptivity, predict the concentrations of iron(III) and therefore volumes of the 30 mg L–1 iron(III) standard solution required to make your ...

*October 14, 2014*

**Chemistry**

And then how do I get (3)? Is it a matter of going c = 3.11; where 0.15 mg in 50mL -> 0.15/50 = 0.003 = 3ppm. So 3.11mg/50mL = 0.0622 = 62.2 ppm?

*October 14, 2014*

**Chemistry**

I.e. Say for 20% T: A = - log (%T/100) = - log (20/100) =0.69897 = 0.699 Then using c = A/bc: c = 0.699/(0.225 x 1) = 3.11 Does that mean the amount for (2) is 3.11 mg L^-1?

*October 14, 2014*

**Chemistry**

Hi was looking to get some help with an experiment. Currently I trying to determine the amount iron in cereal. And was hoping to get some help with one of the questions I have been given. First off I am the recorded absorbance across the region 470 – 490 nm for the 3.00 ...

*October 14, 2014*

**Ed. tech**

writeteacher you suck anonymous your good

*October 13, 2014*

**Math**

Thank You Reiny

*October 13, 2014*

**Math**

If point A is located at (9, -2), which of the following points would be located 9 units away from point A? A. (9,-7) B. (1,-2) C. (9,-11) D. (9,-9) I believe this would be C (9,-11) would I be right? Thanks for the help.

*October 13, 2014*

**Spanish Work Check**

Can someone check my work and tell me if they're grammatically correct and such? Instructions: Be creative and write a sentence for each of the following verbs using the future simple tense. 1.(ella) Venir Ella vendrá mañana a mi casa. 2. (nosotros) limpiar ...

*October 13, 2014*

**math**

Two whole numbers are less than 10 and grèater than 0.whats the difference between their product and their sum.

*October 10, 2014*

**statistics**

if you lose 10% a year, how much will be left of 2.44 million in 26 years?

*October 9, 2014*

**Separation of Racemate**

You have the racemate of a material. This material has an acid group as part of its structure. You also have a chiral base available. Design an experiment to separate the racemate into pure enantiomers. I have no ideas about this experiment and I need some ideas to start off. ...

*October 8, 2014*

**Chem Help Please!**

I only need help with the second question. Thanks!

*October 8, 2014*

**Chem Help Please!**

A material has an optical purity of 50%. How much of each of the enantiomers is present. The R enantiomer of a material has rotation of +35. what is the rotation of the S enantiomers.

*October 8, 2014*

**Chemistry**

A hot air balloon is filled with 1.23 × 106 L of an ideal gas on a cool morning (11 °C). The air is heated to 121 °C. What is the volume of the air in the balloon after it is heated? Assume that none of the gas escapes from the balloon.

*October 7, 2014*

**Chem Help Please!**

A + B ---> C + D ---> F + D

*October 5, 2014*

**Chem Help Please!**

You are carrying out a chemical process according to the equation below. If product C, which is the desired product can decompose to product F, how might you ensure that you stopped the reaction at the optimum point to ensure the maximum yield of C. Thanks!

*October 5, 2014*

**Math**

Is the answer 15 and 3/4?

*October 1, 2014*

**Math**

I added them because I wanted to figure out the total yardage. Just a guess on my part, I was wrong??? I am confused can you show me how I should have done it? Shoud I have subtracted?

*October 1, 2014*

**Math**

To try and figure out what he total yardage might have been

*October 1, 2014*

**Math**

Over 10 plays, a football team gained 63 yards. On 4 of the plays the team gained 0 yards, on 1 play the team lost 3 yards and on 1 play the team lost 6 yards. What was the team's mean gain, in yards, per play for the remaining plays. I did 63 plus 9 equals 72 divided by 4...

*October 1, 2014*

**Math**

THANK YOU SOOOOO MUCH MS. SUE YOU ARE THE BEST!!!!!!

*October 1, 2014*

**Math**

Can some people answer the math questions that were asked. I see none of them being answered. I just need someone to help me understand.

*October 1, 2014*

**Math**

Over 10 plays, a football team gained 63 yards. On 4 of the plays the team gained 0 yards, on 1 play the team lost 3 yards and on 1 play the team lost 6 yards. What was the team's mean gain, in yards, per play for the remaining plays? Could somebody PLEASE HELP ME! It'...

*October 1, 2014*

**Math**

Over 10 plays, a football team gained 63 yards. On 4 of the plays the team gained 0 yards, on 1 play the team lost 3 yards and on 1 play the team lost 6 yards. What was the team's mean gain, in yards, per play for the remaining plays?

*October 1, 2014*

**Math (Trig)**

Rewrite the following expression in terms of tan3x: (sin2x + sin4x)/(cos2x + cos4x)

*September 29, 2014*

**Chemistry**

Anyone know how to go about the problem? I don't know how to do it. Assume a professor has a daily special request for her coffee. She likes to have the 250.0 mL of coffee frozen at -15.0°C overnight and then wants it heated to 95°C when she gets there in the ...

*September 25, 2014*

**physics**

A car has a mass of 1500 kg. If the driver applies the brakes while on a gravel road, the maximum friction force that the tires can provide without skidding is about 7000 N. If the car is moving at 18 m/s, what is the shortest distance in which the car can stop safely?

*September 22, 2014*

**Physics**

As two boats approach the marina, the velocity of boat 1 relative to boat 2 is 2.20m/s in a direction 47.0 ∘ East of North. If boat 1 has a velocity that is 0.745m/s due North, what is the(magnitude and direction) of boat 2?

*September 21, 2014*

**calculus**

Q: Suppose that for all xE(0,5), f(x) is between 1+x and 3+sin((pi)(x)). Find lim x->2 f(x). Is this question related to the intermediate value theorem? It is confusing me, can anyone help out? I am not certain of what xE(0,5) is defining, is that a set of x values or am I ...

*September 21, 2014*

**Math**

Evaluate the function and simplify: f(x)=4x^2+3x-3; f(x-1)

*September 19, 2014*

**Math Help**

Evaluate the function and simplify: f(x)=4x^2+3x-3; f(x-1)

*September 19, 2014*

**chemsitry**

stretched rubber band roller coaster at the top of hill candybar

*September 19, 2014*

**Maths**

The school cafeteria serves tacos every sixth day and cheeseburgers every eight day. If tacos and cheeseburgers are served on the same day, how many days will it be before they are both on the menu again.

*September 17, 2014*

**Chemistry Urgent Help Please!**

Give two means other than crystallization from a solvent that may be used to purify an organic solid. Explain Pleaseeeee!!!!!!!!!!!!!

*September 16, 2014*

**Chem Extraction of Caffeine from Tea**

When doing your extraction you were asked to vent your extraction funnel occasionally during the extraction. Why? You were instructed not to shake the extraction layers too vigorously. Why? What type of compound could cause the layers not to separate cleanly? Thanks!

*September 16, 2014*

**Physics Help**

An airport tram carries passengers between two terminal buildings 500 m apart. The tram starts from rest and accelerations at 1.5 m/s^2 for 20 m. It then travels at a constant velocity for 450 m. Finally, it slows down for 30 m at an acceleration of 1 m/s^2 and comes to rest. ...

*September 15, 2014*

**Organic Chemistry**

F

*September 15, 2014*

**Physics**

An airport tram carries passengers between two terminal buildings 500 m apart. The tram starts from rest and accelerations at 1.5 m/s^2 for 20 m. It then travels at a constant velocity for 450 m. Finally, it slows down for 30 m at an acceleration of 1 m/s^2 and comes to rest. ...

*September 14, 2014*

**Math**

Find how much interest $25,000 earns in 4 years in a certificate of deposit paying 8.5% interest compounded quarterly.

*September 13, 2014*

**chemistry**

suggest an alternative indicator for the standardization reaction. Explain the rationale behind your choice.

*September 13, 2014*

**chm**

how does CO2 affect the titer of a solution of NaOH ?

*September 13, 2014*

**Math**

Is the answer sixty?

*September 12, 2014*

**Math**

Matt made two types of pie: strawberry and blueberry. He cut all of the strawberry pies into 20 slices each and all of the blueberry pies into 15 slices each. If Matt cut the same total number of slices of each type of pie, what is the minimum number of slices of each type he ...

*September 12, 2014*

**Language Arts Answer check PLEASE**

what the answer was ms.sue

*September 12, 2014*

**Physics**

A ball is dropped from a roof of a building and strikes the ground in 3 seconds. If a second ball is thrown horizontally from the roof, it will hit the ground in:

*September 11, 2014*

**math**

Jack has $55.00 that's ten more than 1/3 of what Jill has how much does Jill have

*September 10, 2014*

** Math**

The density, d, of an object is given by the following formula, where m represents the mass of the object and V represents the volume of the object. Heather was asked to find the density of a brick given the mass in kilograms and the dimensions of the brick in meters. She ...

*September 8, 2014*

**ANALYTICAL CHM**

Describe the correct technique for reading the meniscus of a solution in the buret.

*September 6, 2014*

**math**

a square photo display is made up of 60 rows of 60 photos each. the area of each square photo is 4 square inches. how long is each side of the display board?

*September 4, 2014*

**Algebra 2. HELP**

Thankyou Mr.Damon :D

*September 2, 2014*

**Algebra 2. HELP**

Furniture Assembly: At the beginning of your 8 hour shift, there were 42 units of furniture that needed assembled. The number of units N that still need to be assembled during your shift can be modeled by n(t)=-3t +42 where t is the time in hours... 1. Graph the model 2. What ...

*September 2, 2014*

**algebra **

a cannon is 80 feet long. the muzzle velocity = 960 ft / sec. if fired strait up, what is the maximum height

*September 1, 2014*

**memphis school**

Two boats leave a dock at the same time, one goes eastward at 10miles per hour and the other goes north at 24miles per hour how miles apart are both boats after 3hours

*August 27, 2014*

**Precal**

How do I calculate a and b?

*August 23, 2014*

**Precal**

The number cis 75 + cis 83 + cis91 +...+ cis 147 is expressed in the form r cis(theta), where 0 <= theta < 360. Find theta in degrees. @Damon I didn't understand your reply to my post. Could you please explain it to me?

*August 23, 2014*

**Pre-cal**

nvm its 111

*August 23, 2014*

**Pre-cal**

I got 291 degrees. is that correct?

*August 23, 2014*

**Pre-cal**

How do I calculate a and b?

*August 23, 2014*

**Pre-cal**

I don't understand?

*August 23, 2014*

**Pre-cal**

The number cis 75 + cis 83 + cis91 +...+ cis 147 is expressed in the form r cis(theta), where 0 <= theta < 360. Find theta in degrees. I need help.

*August 23, 2014*

**Physics**

A 25 kg box is along a horizontal floor and a force of 400 N pushes the box with an angle of 50 deg with the horizontal. Starting from rest, the box achieves a velocity of 2 m/s in a time of 4 seconds. Find the coefficient of sliding friction between box and the floor.

*August 22, 2014*

**Physics**

A 20 kg wagon is pulled along the level ground by a rope inclined at 30 deg above horizontal. A frictional force of 30 N opposes the motion, how large is the pulling force if the wagon is moving at constant velocity?

*August 22, 2014*

**Physics**

A body A of a mass 0.16 kg exerts a force of 6.2x10^-10 N on a body B when the distance between their centers is 0.37 meters. What is the mass of body B?

*August 22, 2014*

**Philippine history**

Anyone here please give me the possible questions that can threw up to me about Filipinization of Government. Please. Thank you.

*August 20, 2014*

**Physics**

Still physics. It has a figure shown here. Can't show u the picture. But its like, theres a box and another box suspended by a cord on either sides of a pulley creating 30 deg and 50 deg.

*August 19, 2014*

**Physics**

Okay then. Maybe it's a typo. I'll ask my teacher about this tom :) uhmm anyway, how can you get the acceleration of the two boxes and tension in the cord if you just have 53 degrees and 30 degrees?

*August 19, 2014*

**Physics**

Hi Damon. Thank you. It is written on my book, it's really 15 seconds.

*August 19, 2014*

**Physics**

A 50 kg box rests on a smooth frictionless table. Connected to the box is a light string passing through a pulley at the end of the table. Suspended on rhe other end of the string is a 20 kg box. Find a) acceleration of the system, b) the tension in the string c) the ...

*August 19, 2014*

**Precal**

Prove algebraically that |w+z|<=|w|+|z| for any complex numbers w and z.

*August 16, 2014*

**english**

Menna is correct!

*August 15, 2014*

**Physics**

In a binary star system in which 2 stars orbit each other about their centre of mass, the mass of one star is 20m while the other star is m. In another binary star system, the masses of the star are 14m and m. The fixed distance between the stars in the both cases are the same...

*July 7, 2014*

**statistics**

The inside diameter of metal washers produced by a company are normally distributed with a mean of .5 inches and a standdrd deviation of .01 inches. Of all washers produced .8% of the washers are rejected because they are too small for a bolt used to test them. What is the ...

*June 28, 2014*

**Math**

The digit sum for 126 is 1+2+6, or 9. The digit sum for 300 is 3+0+0, 0r 3. Find the two consecutive numbers that have digit sums of 36 and 1 Please help - Thank You

*June 27, 2014*

**math**

Matt is working for 75 points. If he answered 16 of 31 questions correctly, how many of the 75 points did he earn?

*June 24, 2014*

**physics**

The cricketer in the previous question hit the ball off the bat with a velocity of 25 m/s at an angle of 38° above the horizontal. If the boundary is 60 m away, work out whether the ball clears the boundary without bouncing or not. help please!

*June 23, 2014*

**physics**

A 78 kg volleyball player jumps and leaves the ground with a vertical velocity of 3.5 m/s. By thinking about the conservation of energy in a freefalling object, work out how high their centre of mass would reach at the top of their jump and present your answer to the nearest ...

*June 23, 2014*

**Columbus State**

CO(g) + 2H2(g) ↔ CH3OH(g) Kc=14.5 (500K) a. In which direction will the reaction proceed if the reaction vessel contains 0.500 atm CO, 0.500 atm H2, and 0.500 atm CH3OH? Show your calculations for full credit. Remember that Q and K both have to be calculated with either ...

*June 22, 2014*

**Mircoeconomics**

Is it true that monopolies do not exist in our economy? Please explain

*June 21, 2014*

**Intro to Algebra**

The cost for paint to cover the exterior of the four sides of a shed was $40. A can of paint costs $10 and will cover 33 square feet. The shed consists of four sides, each shaped like a trapezoid. They each have one base of 5 feet and one base of 6 feet. What is the altitude ...

*June 12, 2014*

**English**

Thank You

*June 9, 2014*

**English**

In the following sentence the word alternate is used as a verb or adjective? There must be an alternate solution to this problem. Thank You

*June 9, 2014*

**math**

fifteen less than four times seven

*June 2, 2014*

**math**

If I make 600$ every 14 seconds, how long would it take me to get 1,000,000$?

*May 31, 2014*

**Maths**

Question: total of 40 students in class, boys number is double of the girls number. How many boys & girls in the class? Working as follow: a = boy b = girl 2a + b = 40 2a + 2a = 40 4a =40 a =10 b=2a b = 2x 10 b = 20 So a=10, b= 20. Total only 30, not 40 . Why? Thanks

*May 22, 2014*

**Maths**

Question: total of 40 students in class, boys number is double of the girls number. How many boys & girls in the class? Working as follow: a = boy b = girl 2a + b = 40 2a + 2a = 40 4a =40 a =10 b=2a b = 2x 10 b = 20 So a=10, b= 20. Total only 30, not 40 . Why? Thanks

*May 21, 2014*

**Physics Please help4**

Two 1.50cm -diameter disks spaced 1.80mm apart form a parallel-plate capacitor. The electric field between the disks is 5.10×10^5 V/m I got the voltage as =918 but B. How much charge is on each disk? _________C? and C. An electron is launched from the negative plate. It ...

*May 21, 2014*

**Physics Please help3**

A point charge with charge q1 = 3.10μC is held stationary at the origin. A second point charge with charge q2 = -4.60μC moves from the point ( 0.160m , 0) to the point ( 0.270m , 0.255m ). How much work W is done by the electric force on the moving point charge? ...

*May 21, 2014*

**Physics Please help2**

Two small insulating spheres with radius 7.00×10^−2m are separated by a large center-to-center distance of 0.565m . One sphere is negatively charged, with net charge -2.05μC , and the other sphere is positively charged, with net charge 4.10μC . The charge...

*May 21, 2014*

**Physics Please help**

A thin, horizontal 20cm×20cm copper plate is charged with 1.7×10^10 electrons. Consider the electrons are uniformly distributed on the surface. A. What is the strength of the electric field 0.1 mm above the center of the top surface of the plate? E=____ N/C B. What...

*May 21, 2014*

**Math**

This seems like it would be a simple math problem but...... How do you create an equation and calculate the difference between 2 birthdays, putting the older person's on top? 5/17/1987 and 10/28/2002 PLEASE HELP ME!

*May 20, 2014*

**Math**

This seems like it would be a simple math problem but...... How do you create an equation and calculate the difference between 2 birthdays, putting the older person's on top? 5/17/1987 and 10/28/2002 PLEASE HELP ME! hank You

*May 20, 2014*

**Math**

Ms. Sue are you there? You have helped me so much in the past could you please help me with this? Thank You

*May 20, 2014*

**Math**

This seems like it would be a simple math problem but...... How do you create an equation and calculate the difference between 2 birthdays, putting the older person's on top? 5/17/1987 and 10/28/2002

*May 20, 2014*

**Physics**

How to solve? 2. A 70.0 kg astronaut is training for accelerations that he will experience upon reentry. He is placed in a centrifuge (r = 10.0 m) and spun at a constant angular velocity of 16.3 rpm. Answer the following: a. What is the angular velocity of the centrifuge in ...

*May 20, 2014*