Friday

July 25, 2014

July 25, 2014

Total # Posts: 214

**physics**

A flat circular mirror of radius 0.150 m is lying on the floor. Centered directly above the mirror , at a height of 0.750 m, is a small light source. Calculate the diameter of the bright circular spot formed on the 2.90 m high ceiling by the light reflected from the mirror.

**Physics**

a person's metabolic processes can usually operate at a power of 6 W/kg of body mass for several hours at a time. If a 60 kg woman carrying a 12 kg pack is walking uphill with an energy-conversion efficiency of 20 percent, at what rate, in meters/hour, does her altitude in...

**Excelsior**

he following transactions occurred during March 2009 for the Wainwright Corporation. The company owns and operates a wholesale warehouse. 1. Issued 30,000 shares of common stock in exchange for $300,000 in cash. 2. Purchased equipment of a cost of $40,000. $10,000 cash was pai...

**Physics**

The hypothenuse of a right triangle measures to be 17.5 cm. If the three angles are 30 degrees, 60 degrees, and 90 degrees, what are the lengths of the other two sides?

**Physics**

The hypothenuse of a right triangle measures to be 17.5 cm. If the three angles are 30 degrees, 60 degrees, and 90 degrees, what are the lengths of the other two sides?

**Business 101**

your #2,13,15,17,18 are wrong

**chemistry**

The kinetic energy of a rolling billiard ball is given by KE=1/2mv2. Suppose a 0.17-kg billiard ball is rolling down a pool table with an initial speed of 4.7m/s . As it travels, it loses some of its energy as heat. The ball slows down to 3.7m/s and then collides straight-on w...

**statistikc**

1. statistic 2. B. 3.

**Science (MYOGLOBIN)**

It's heme I figured it out myself. Thanks

**Science (MYOGLOBIN)**

Does anyone know the coenzyme found in myoglobin

**chemistry**

how do I determine the total charge of Asn-Tyr-Asp with a pH 7.4

**chemistry**

How do I determine the total charge of Asn-Tyr-Asp with a pH 7.4

**chemistry**

a certain a digestive reaction, performed at optimum temperature and pH takes 10 minutes to reach completion when performed in the absence of the associated catalyst. How many minutes would the same reaction require if an enzyme that increase the reaction rate one million time...

**Chem**

Ok thank you :D

**Chem**

Use a chemical equation to help explain why the pH of an aqueous solution changes after HCl solution has been added This is what I got HCL + H2O = H30+ plus CL- Hope that makes since (those are a positive and negative signs at the right side of the equation) Tell if I'm ri...

**organic chem**

Amide formation: draw the structure (or provide the IUPAC name) of the amide formed (appropriate coupling reagent required) between benzoic acid and N-ethyl ethanamine (diethyl amine)

**organic chem**

Hydrolysis: draw or name the products of hydrolysis of sec butyl 2-methylbenzoate Thank you I know you cant draw them but the names of products would be helpful.

**org. chem**

Give IUPAC name of the products of the dehydration of this alcohol? 2-ethyl cylcopentanol

**organic chem**

Draw and give IUPAC name the products of dehydration of 2-ethyl cyclopentanol I know you can't draw it but the name or even how to draw this would be appreciated

**organic chem**

Dehydrate the following a. 2-methyl-1-propanol b. 2-methylcyclohexanol c. 2-methyl-1-phenyl-1-propanol d. 1-methylcyclopentanol

**organic chem**

Classify as primary, secondary, tertiary alcohols. i. 2-butanol ii. 3-methyl-3-pentanol iii. 2-methyl-1-pentanol iv. 3-chlorocyclohexanol

**organic chem**

Oh ok thank you. Sorry, I'm really dumb when it comes to this stuff :)

**organic chem**

Ok I understand how your getting the parent compound. I'm not understanding where for example question 1, the '2-methylbutyl'. Thats where I keep getting messed up.

**organic chem**

Name the ester obtained when the alcohol is reacted with 2-ethylpentanoic acid? 1. 2 -propanol 2. 2-butanol 3, phenol

**organic chem**

Ok thank you so much I'm going to try to attempt the others.

**organic chem**

oh sorry, I wrote the ethyl group on my equation just didn't write it on the forum. Anyway, I'm curious how did you do the first one. Where did the ammonia come into play? It looks like you lost the -anoic acid group and replaced with the ammonia (NH3). And why did the...

**organic chem**

Ok, I'm just confused on the coupling reaction. Is the coupling reaction the amide like for A. Is is Ammonia. I drew out 3-hexanoic acid + NH3...thats where I'm stuck. I do apologize for the amount I'am asking you. I appreciate the help.

**organic chem**

ok, then just name the amide

**organic chem**

Draw and name the amides that would be obtained by reaction of 3-ethylhexanoic? Also with the apropriate coupling reagent, and the following amines: A. ammonia B. methanamine C. N-methyl methanamine D. Aniline E. N-ethyl aniline

**organic chem**

which of following alcohols can be oxidized to be a carboxylic acid. Name the carboxylic acid produced. Those that cannot be oxidized to a carboxylic acid name the final product A. ethanol b. 2-propanol c. 1-propanol d. 3-pentanol

**org. chem**

what would the oxidation product 1. 2-methylpentnal 2. 3-pentanone My answers: 1. 2-methylpentanoic acid 2. no further reaction I just want to be sure I'm doing this right. Thanks.

**organic chem**

Write an equation representing the oxidation of each of the following. I'm on 3-hexanol. And this is what I got -> [o] 3-hexanal and further oxidation I know you get 3-hexananoic acid. I don't know how to make this in the line formula. Can I put the -OH and the doub...

**organic chem**

Which are enatiomers? optically active?identical? diastereomers? A.)...CH3 .....| ...H-C-Cl .....| .....Ch2Cl B.).....H .......| ...H3C-C-CH2CL .......| .......CL C.)...CH3 .......| ....CL-C-H ......| ......CH2CL D.)....CH2CL .........| ......CL-C-H .........| .........CH3 E.)...

**org. chem**

Draw the acetal obtanined from 1-propanol and benzaldehyde Draw the ketal obtained from 2-propanol and 3-methylcyclpentanone Can someone tell me where the actal/ketal comes from or do I just add it to the equation. Not sure how to start this. Thanks :)

**org. chem**

Can someone explain in simple terms the difference between hemiketal and hemiacetal? Just curious

**organic chem**

Draw the hemiketal obtained by addition of methanol to 3-methyl-2-hexanone This is what I got: 3-methyl-2-hexanone + CH3OH <-> CH3CH2CH(CH3)CH2C(OH)(CH3). But my answer is line angle formula because that's what the professor wants here's my line formula CH3 /\/\/...

**org. chem**

ok thank you thats what I got :)

**org. chem**

The question asks, "draw the hemiacetal obtained by addition of ethanol 2-methylpentanal" My question is how to do this problem? I know you can't actually draw it out on this site. However so I know how to do it on the upcoming test. Thanks :)

**organic chem**

oxidation product for 3-methyl-1-heptanol

**org. chem**

Hello, I do apologize DrBob222 I didn't see your post from yesterday. However, thank you for help and thank you devron for your help as well. The extra credit only says how would prepare a .6m acetate buffer with a pH = 4.0. So I too, wasn't sure what the question was ...

**org. chem**

How to start these problems out: Please help thank you Use the Henderson-Hasselbach equation: pH = pKa + log [A-]/[AH], where A- is the conjugate base and AH is the weak acid. Calculate the pH of an acetate buffer in which the acetate concentration [CH3COO-] is 3.5 times great...

**organic chem**

. Use the Henderson-Hasselbach equation: pH = pKa + log [A-]/[AH], where A- is the conjugate base and AH is the weak acid. Calculate the pH of an acetate buffer in which the acetate concentration [CH3COO-] is 3.5 times greater than acetic acid [CH3COOH]. pKa = 4.74. 9. How wou...

**physics**

The body of a 1258 kg car is supported on a frame by four springs. The spring constant of a single spring is 1.31 × 104 N/m. Four peo- ple riding in the car have a combined mass of 230 kg. When driven over a pothole in the road, the frame vibrates and for the first few s...

**AP Psychology**

What is right brain education and how does it relate to cerebral lateralization

**College algebra**

What is the domain for X³+2X²-9X-18

**College Physics**

Just for clarification, the question asks if he does 3.85 X 10^2 J of work.

**College Physics**

Suppose the Eskimo is pushing the same 50.0-kg sled across level terrain with a force of 51.5 N. If he does 3.85 102 J of work on the sled while exerting the force horizontally, through what distance must he have pushed it?

**Physics **

An astronaut on a distant planet wants to determine its acceleration due to gravity. The astronaut throws a rock straight up with a velocity of + 14.2 m/s and measures a time of 22.2 s before the rock returns to his hand. What is the acceleration (magnitude and direction) due ...

**Geometry**

Find the perimeter of a square with sides 10 feet long?

**Geometry**

In the standard (x,y) coordinate plane, if the x-coordinate of each point on a line is 4 less than twice its y-coordinate, what is the slope of the line?

**business**

all 400 answers are correct

**Physics**

A capacitor consisting of two parallel plates of area A = 4.6 m2 and spacing d = 0.150 m is filled with two parallel slabs of dielectric material of equal thickness and with dielectric constants 1 = 2.20 and 2 = 5.50, respectively. What is the total capacitance?

**social studies**

How can you use the word league in a sentence

**7th Geometry**

We are using the Pythagorean rule and I'm a little confused... Solve each problem using a grid. Round your answer to the nearest hundredth. Dover is located at (1,2) and Goodlow is located at (5,7). How far apart are the 2 cities? My answer is 6.40... am I doing this right...

**geometry**

A tree that is 100 feet tall casts a shadow that is 150 feet long. Determine the angle at which the rays of the sun hit the ground to the nearest degree.

**algebra**

The half-life of plutonium-234 is 9 hours. If 40 milligrams is present now, how much will be present in 4 days? (Round your answer to three decimal places.)

**chemistry 111**

2A+3B 3C hOW MANY MOLES OF b ARE REQUIRED TO COMPLETELY REACT WITH 9 MOLES OF A?

**math**

Suppose that the format for license plates in a certain state is two letters followed by four numbers. How many different plates can be made if repetitions of numbers and letters are allowed except that no plate can have four zeros?

**physics**

how to solve for velocity using these values... distance time(s) 28.5 (initial) 4.26 (initial) 89 (final) 6.77 (final)

**physics**

the car travels at 20m/s when the driver sees a child. It takes 0.8s to react, then steps on the brakes and slows at 7.0m/s^2. How far does the car go before it stops?

**physics**

a bike first accelerates from 0m/s to 5.0m/s in 4.55, then continues at this constant speed for another 4.5s. what is the total distance traveled by the bike?

**physics**

a student drops a ball from a window 3.5m above the sidewalk. the ball accelerates at 9.80m/s^2. How fast is it moving when it hits the sidewalk.

**physics**

A bike accelerates from 0.0m/s to 4.0m/s in 4s. what distance does it travel?

**Statistics**

An automatic machine in a manufacturing process is operating properly if the lengths of an important subcomponent are independently and normally distributed with a mean of 120 cm and a standard deviation of 4.7 cm. Find the probability that if 3 are randomly selected, all 3 ha...

**physics**

A baseball thrown at an angle of 65.0^\circ above the horizontal strikes a building 16.0 {\rm m} away at a point 5.00 {\rm m} above the point from which it is thrown. Ignore air resistance. a) find the magnitude of the initial velocity of the baseball. b) find the magnitude of...

**physics**

A man stands on the roof of a 19.0 m tall building and throws a rock with a velocity of magnitude 30.0 m/s at an angle of 30.0 degrees above the horizontal. Ignore air resistance. Calculate the horizontal distance from the base of the building to the point where the rock strik...

**AP Calculus**

If f(x)=3x^2-x+2 then what is 2f(a)? What is f(2a)? What is f(a^2)? What is [f(a)]^2? What is f(a+h)?

**English**

Our state is bordered by Kansas to the west. Should west be capitalized...I was thinking it was a direction and didn't.

**Math**

Bacteria experiences exponential growth, increasing 17% every hour. If there are 800 bacteria now, in how many hours will there be 2000? How would I go about this problem?

**Math**

Okay, I need to find the 101th term of the sequence 5,9,13,17,21... Do I do this: a1 + (n-1)d SO... 5+(101-1)4 5+(100)4 105x4 420 Did I do this problem correctly?

**Algebra**

Thanks for your help!! I knew how to start, just wasn't sure the steps to go!

**Algebra**

Solve the logarithmic equation. log2(4x)-log2(x+3)=1

**Algebra**

4^(2x-2)=26

**Algebra**

Solve the exponential equation. 4^2x – 2 = 26 I know I use the one to one property to equate. But I am confused. Thanks!

**pre cal**

what is the equation to make a heart out of a cardioid?

**Math**

A raffle held by Mundane Products has collected 700 entries. They are giving away 40 TVs and 30 stereos. John bought 5 entries for the raffle. What is the probability that John wins exactly one TV as well as exactly one stereo? John just heard that the TVs are already decided ...

**Math**

What is the probability that at least 2 people in a random group of 4 people have a birthday on the same day of the week? Answer:

**Math**

A right circular cylinder with a height of 20 cm and a right circular cone share a circular base and have the same volume. What is the height of the cone?

**math**

In a game of blackjack, each player is dealt two cards from a standard 52-card deck. If the first card is 10 of clubs, what is the probability that the second card is heart?

**Math**

A teacher is trying to pick 7 students to represent his class at an upcoming state competition. If there are 18 boys and 10 girls in the class, in how many ways can the teacher pick 4 boys and 3 girls to attend the event?

**Math**

Thanks!!!!!!!

**Math**

A florist has access to 9 types of flowers and 8 types of foliage. He makes bouquets using 4 types of flowers and 3 types of foliage. How many different bouquets can he make?

**APUSH**

The U.N. Resolution 1441 authorized what?

**Math**

If you can afford a monthly payment of $760 for 27 years and if the available interest rate is 5.40%, what is the maximum amount that you can afford to borrow?

**AP Chemistry**

what si the procedure to make a 0.10m solution of Potassium Hydroxide during a class lab?

**AP Chemistry**

This is an Advance placement chemistry class. We were told to fine the materials needed to do this lab, and the procedure. i need this info so i can physically do the lab.

**AP Chemistry**

what are the procedures and materials needed to make a 0.10m solution of Silver(I) Chloride?

**AP Chemistry**

what is the procedure and materials needed to make a 0.10m solution of Potassium Hydroxide?

**physics**

thank you!

**physics**

A hot stell ball of mass 1 kg is dropped into a 4 L bucket of water at room temperature (70 degrees F). If the system reaches an equilibrium temperature of 320 K, what was the initial temperature of the steel ball before it was dropped into the water? Cp of steel = 490 J/kg de...

**chemistry**

when a balloon has 1.2 L of a gas at 1.1 atm what will be the new volume of the balloon if the ballooon is placed in a partial vacuum, with a pressue of .35 atm?

**math**

scientific notation please exlain.

**New Age Math**

Consider the region defined by the inequalities: 0≤x 0≤y -21/4≤y-7/4x y+x≤7 4≤y-3/7x Pick up those points which are the boundary points of the resulting convex region.

**New Age Math**

Suppose that y≤5x,3x≤y and 14x+15y≤1 together with 0≤x, 0≤y. The maximum value of the function y+x on the resulting region occurs at x=? and y=? The maximum value of the function is ?

**English**

I need to write a Reading Response to "Why We Crave Horror Movies" by Stephen King. I need help figuring out the theme to the essay.

**6th grade English**

Draw a line under each preposition and to lines under the object of a preposition. He was thirty years old when he first went to California in 1868. i underlined once "to California" and "in 1868" and i under lined twice twice Californiia and 1868. is this ...

**algebra2**

What is the value of x in the solution to the system y = 4x + 3 and 3x + 2y = -16? (Round to the nearest integer if necessary.)

**Math- Geometry**

A board 20 feet long is cut into two boards with lengths in ratio of 5 to 2. To the nearest tenth of a foot, how lng is the longer piece of the board?

**math**

how long will it take to earn 525$ in interest if $3500 is invested at a 6% annual interest rate?

**math**

Omar wants to buy a double scoop ice cream cone. His favorite flavors are vanilla, strawberry, raspberry and chocolate. A combination with both scoops of raspberry represents ___ out of ___ possible combinations.