# Posts by frank

Total # Posts: 533

**Solution Making**

Suppose you start with a 5X solution A, and you want a final volume of 10ul of 1X solution. How much Solution A do you need? Can you please check my work not sure. I need 2 ul of solution A to 8 ul of H2O. 5/1=.2*10=2

**solution making/ chemistry/biotech**

thank

**COMM/215**

I would like to know if i have used the correct grammar and punctuation in the following two sentences: 47. "Have you ever read the story, 'The Tell-Tale Heart' by Edgar Allen Poe?" Dave asked. 48. "Did the professor say, 'Put down your pencils'...

**COMM/215**

I would like to know if i have used properly structured sentences for the following: 49. To succeed in the new economy, workers will have to learn throughout their careers adapt to changing circumstances, and self-motivate when needed. 50. Some students hate math; some ...

**AP Calc**

find f(x), if f'(x)=2x-3 and the graph of y=f(x) contains the point (2,5).

**algebra**

the lenght of a rectangular is 50 feet more than the width,it the perimeter of the basketball court is 300 feet,what is the lenght of the field

**Intro to computers**

You have set up Remote Desktop for the company server running Server 2008 so that your users can RDP in from their XP workstations. Users are calling you saying that they are being denied the ability to remote in. What is the most likely reason? A. XP does not support Remote ...

**Physics**

An object is placed 4 cm in front of a concave lens of focal length 3 cm. Using the lens equation, find where the image will form and state whether it is a real or virtual image.

**Physics**

An object is placed 4 cm in front of a convex lens of focal length 3 cm. Using the lens equation, find where the image will form and state whether it is a real or virtual image.

**Physics**

An object is placed 11 cm in front of a convex mirror of focal length 4 cm. Using the lens equation, find where the image will form and state whether it is a real or virtual image.

**Physics**

857.5hz?

**Physics**

What is the frequency of a sound wave in air at 20°C that has a wavelength of 0.4 m?

**Physics**

Thanks!!

**Physics**

A cubical object of sides 5 cm is immersed completely in water. What is the force of buoyancy on the object? (Assume g = 10 m/s2)

**physics**

Two point charges, each 6*10-5 C, are separated by 30 cm. What is the electrostatic force produced by this arrangement?

**Physics**

Does P=V^2/R seem correct?

**Physics**

A 30 ohm resistor is connected to a 1.5 V battery. How much power is dissipated by the resistor? I'm confused of the formula to use here.

**Physics**

A 4 ohm resistor and 10 ohm resistor are connected in series. If this circuit is connected to a 12 V battery, how much current will flow through the circuit?

**Physics**

A 10 ohm resistor and a 20 ohm resistor are connected in parallel. What is the equivalent resistance of this setup? What formula do I use for this?

**Physics**

Aluminum has a resistivity of 2.7*10-8 Ùm. What would be the resistance of 100 m of aluminum wire with a cross-sectional area of 2*10-4 m2?

**Physics**

How can you demonstrate that water is denser than ice without weighing them? What is the principle involved?

**Calculus angle of elevation**

Bob is wrong dx/dt = 3ft/s, dƟ/dt = ? 5ft/x = tan Ɵ Differentiating each side with respect to the time: (-5ft)/x^2 dx/dt=〖sec〗^2 ϑ dϑ/dt So dϑ/dt=(-5ft)/x^2 dx/dt.〖cos〗^2 θ We want to evaluate the change at the ...

**chemistry**

EDTA: 292.2 1. How would you make 250ml's of a 15% EDTA solution 2.How much of solution 1(above)should be used to make 500ml's of a .1% EDTA solution.

**Vocabulary**

implication

**Physics**

I don't get it

**Physics**

A ball is thrown horizontally from the top of a building 45.9 m high. The ball strikes the ground at a point 121 m from the base of the building. The acceleration of gravity is 9.8 m/s2 . Find the time the ball is in motion. Answer in units of s Find the initial velocity of ...

**physics**

THANK YOU I actually needed only the second part and I did the same as u but I forgot to put parentheses!

**physics**

A descent vehicle landing on the moon has a vertical velocity toward the surface of the moon of 22.7 m/s. At the same time, it has a horizontal velocity of 58.9 m/s. At what speed does the vehicle move along its descent path? Answer in units of m/s At what angle with the ...

**Math**

Np

**Math**

28 inches

**Advanced Algebra**

The polynomial function defined by f(x) = 1 − x + x^2 − x^3 + ... + x^16 − x^17 may be written in the form f(y) = a_0 + a_1 y + a_2 y^2 + ... + a_16 y^16 + a_17 y^17, where y = x + 1 and a_i s are constants. Find a_2.

**Calculus**

Find the points at which y = f(x) = x^11-6x has a global maximum and minimum on the interval 0 ¡ x ¡ 4 Round your answers to two decimal places. Global Maximum: (x,y) = (,) Global Minimum: (x,y) = (,)

**physics**

Find the x- and y-coordinates of the center of gravity of a 4.00 ft by 8.00 ft uniform sheet of plywood with the upper right quadrant removed as shown in the figure below. The dimensions of the cutout are a = 4.50 ft and b = 1.70 ft. HINTS: Think of the board as being made of ...

**physics**

Traveling at a speed of 19.5 m/s, the driver of an automobile suddenly locks the wheels by slamming on the brakes. The coefficient of kinetic friction between the tires and the road is 0.740. What is the speed of the automobile after 1.21 s have elapsed? Ignore the effects of...

**Math College (Algebra)**

How to solve this system? x + [(3x-y)/(x^2+y^2)] = 3 y - [(x+3y)/(x^2+y^2)] = 0

**physics**

A 20 kg object is acted on by a conservative force given by F = -3.0 x - 5.0 x 2, with F in newtons and x in meters. Take the potential energy associated with the force to be zero when the object is at x = 0. (a) What is the potential energy of the system associated with the ...

**chemistry**

Suppose 1.2x10^3 kg of C is mixed with 2.4x10^5g oxygen gas and carbon dioxide forms. 1. write the reaction and balance 2.which reactant is the limiting reagent and which reactant is in excess 3. How many grams of carbon dioxide will be formed.

**Fractions**

How many 1/4 cup servings are in 5/6 cup of raisins?

**chemistry**

thank you, i forgot to convert the mols, once i put that part in. I got about the same thing as you

**chemistry**

A 2.556g sample of baking soda (NaHCO3)decomposes to produce 0.876g of solid sodium carbonate. Caculate the theoretical yield and the percent yield of the sodium carbonate. The equation is: 2NaHCO3(s) -> Na2CO3(s) + H2O + CO2(g)

**chemistry**

Calculate the number of moles of O atoms in a 2.5x10(-6)kg sample of C8H10N4O2

**chemistry**

thank you

**chemistry**

Calculate the number of C atoms in a .25mg sample of C8H10N4O2

**chemistry**

balanced equation =2 H(2)+ 1 O(2) -> 2H(2)O A. What mass of H2O would be produced from7.4 mg of O2 B. What is the volume of H2O would be produced from 7.4kg of O2. Density of water = 1.000g/ml

**Economics**

Country A is producing 4 units of X and 8 units of Y and country B is producing 4 units of X and 6 units of Y. The opportunity cost of producing more of A) good X is the same for both countries. B) good Y is the same for both countries. C) good X is lower in country A. D) good...

**Physics**

At some instant, a particle traveling in a horizontal circular path of radius 7.80 m has a total acceleration with a magnitude of 15.0 m/s2 and a constant tangential acceleration of 12.0 m/s2. Determine the speed of the particle at this instant(initial speed) and (1/8) ...

**chemistry**

You have a protein solution of 3.7mgs/ml You need to load 20ug onto a gel. How much of this solution would you use ?

**chemistry**

thanks that is exactly how the teacher gave us the questions

**chemistry**

How would I make 500 ml's of a .35M NaCI solution. MW= 58.44 ( I know how to do the first part) How many micromoles of NaCI would be present in that solution? What would be the percentage of NaCI in that solution?

**Math**

You ride your bike at an average speed of 8 miles per hour.how many miles can you travel in 1.5 hours?

**statistics**

Suppose a study is done in which several random samples of people from a population are taken and polled on the number of hours per night they sleep. It is determined that the sample proportion for those who sleep at least 8 hours a night is 36%, and the 95% confidence ...

**math**

Frank was a jacket that cost $60 ESA $43 what is the fraction of the amount that he that he needs to saved

**Albebra**

2 dice are rolled.What is the probability that neither both numbers are 2's or their sum is less than 6?

**u.s. history**

What was the prevailing economic challenge the United States faced at the start of World War II

**English**

Thank you very much. I still have these sentences I'm doubtful about. My doubt is whether I should use the present perfect or the simple past (considering that it is the end of the school year) 1) Exercises for literary text analyses aimed at developing lexicon have been ...

**English**

Can someone check the grammar in the following sentences? Thank you in advance. 1) The nuclear power station can give our town a lot of energy and jobs to people. 2) We won't be able to use the farmland near the power station because it will be polluted with chemicals. We ...

**C++**

The variables arr1 and arr2 have been declared as pointers to integers . An array of 10 elements has been allocated, its pointer assigned to arr1, and the elements initialized to some values . Allocate an array of 20 elements , assign its pointer to arr2, copy the 10 elements ...

**Math**

kim has 4/10 of a dollar. Carla has 40/100 of a dollar. Who has more money? Explain Colin has 3 quarters. He says he has less than 8/10 of a dollar. is he correct? Explain.

**English**

Can someone help me with these sentences? Which of them are grammatically correct? Thank you very much in advance. 1) They are not able to dance well. 2) They can't dance well 3) Are you able to play the piano? 4) Can you play the piano? 5) Were you able to find the book ...

**English**

Can someone explain to me the difference between angry about and angry for (when a verb follows)? I think "about" is used in sentences like: he is angry about being in jail (Would "for" be possible in this sentence?) he is angry with me for being rude to ...

**English**

Can someone check if the questions and the sentences are grammatical? Thank you. 1)Can you fly with a Bergonian passport? 2) Why might visitors not be welcome on Seeland? 3) What are the citizens of the Aerican Empire like? 4) What happened to Danny when he accepted his friend...

**English**

Yes, I wrote the sentences incorrectly: Thank you He was seen to watch the TV He is still dependent on ... but independent of.... I was so angry WITH him FOR behaving like that in front of everyone. (about behaving would be a mistake?) The teacher was annoyed WITH me FOR ...

**English**

Can someone check if the following prepositions/verbs are correct? Thanks 1) I couldn’t help CRYING 2) It’s no use EXPLAINING it to him; he won’t understand. 3) He was seen TO the watch. 4) I can’t afford TO BUY it. 5) Norma is anxious ABOUT making the ...

**eNGLISH**

Can you please tell me if the sentences are grammatically correct? e.g. "facing death" or the ability to face death Hamlet doubtful about the existence of an afterlife.

**English**

Can someone check these sentences, please? I thank you in advance. 1) Lady Macbeth "becomes sleepwalking" 2) Cowardice is the ability to bear the sorrows of our life and to stay alive, while courage is facing death by committing suicide 3) We can't be sure about ...

**math**

square root of [2+(square root of 1+k)]=square root of 5. Solve for k

**math**

square root of 2+(square root of 1+k)equals the square root of 5. Solve for k

**algebra**

square route of 2 plus the square route of 1 plus k = 2.24

**English**

Can someone please help me check the grammar in the following sentences? 1) I would like to inform people about the danger (after effects?) of having a nuclear power station near our town 2) I hope you will listen to our advice. 3) Animal and plant species will be in danger.

**SAT prep help**

If x^4=10, what it x^6?

**English**

Can someone of you check these sentences, please? Thank you in advance. 1Complete the sentences with the correct form of should, must or have to. 1You _________ be worried. This test is very easy. (don’t have) 2All the students _________arrive on time. (must) 3In my ...

**English**

Can someone check if the following questions are grammatically correct? Thank you. 1)Please Henry the VIII rule by focusing on the following: -Why he broke ties with the church -What the Act of Supremacy established -What political and social changes the reformation brought ...

**English**

Can someone tell me what's the British for the words "common trash barrels", "sorted trash", "regular kitchen" trash or food/garden waste? Thank you I'm quite environmentally friendly. I have three containers at home into which to sort my ...

**English**

Can someone help me with these sentences, please? Thank you very much in advance. I use the Internet to conduct school research, use translation programmes, use an online homework agency, do online shopping, play games, chat with my friends, send private instant messages, log ...

**English**

Can someone check these sentences, please? I need to prepare them for Tomorrow. 1) Air pollution is mainly caused by gases from factories and car exhaust fumes. It can cause acid rain, breathing problems and it can increase the risk of cancer. 2)The destruction of the ozone ...

**English**

Just one more thing. Which of the following sentences are grammatical? Thank you very much for your cooperation. 1.I spent most of my holiday at home. 2. I spent the greatest part of my holiday at home. 3. I mainly/mostly stayed at home during my holiday. 4.For the most part, ...

**English**

Are both skiing Holiday and ski Holiday possible? Thank you.

**EARTH SCIENCE**

the answer to 1 is not D!

**English**

Can you tell me if the expression the most part of my holiday is a mistake? I used it once instead of the greatest part of.. Thank you.

**math**

if 3a+3(b+1)=c, what is b+1 in terms of a and c?

**English**

I left out these last sentences. Thank you. 1) My parents like my clothes style very much and not They like so much my clothes style. 2) My favourite style is the urban look because it is comfortable enough for school. 3) Each of you will have to join one of the four groups ...

**English**

Can you please check these sentences I'm doubtful about? Thank you very much. 1) My parents like my clothing style because they think that wearing practical clothes is the most important thing/most important is to wear practical clothes/ 2) I was given these trousers for ...

**English**

Can you please check these sentences? Thank you very much in advance and Merry Christmas! 1) The Key-Note begins with an extended description of Coketown, the fictional setting for the novel, which is based on Preston, now part of greater Manchester, where Dickens went in 1953...

**English**

I still have a few doubts. Thank you very much. 1) When I go to a party, I generally wear clothes which are smarter than the ones I wear for school. 2) I want to be original and on fashion (is it possible?) 3) What do you think of/about this coat? Are both "about " ...

**English**

I urgently need your help with a few sentences. Can you tell me which alternatives are possible? 1) What do you think of/about these shoes? 2) AlL the ones I have been shown are uncool 3) all of the ones I have been shown... 4) He was given two weeks by the judge in which to ...

**Math**

A football arena measures 100ft. wide by 200ft long.The games are played on a similar rectangular field that's 150ft. long. What is the width of the football field? What is the perimeter of the football field?

**Math**

A faulty odometer (mile indicator) on a car registers 6 miles for every 5 miles travelled. A t the start of a journey it reads 500 miles and at the end of the journey it read 560 miles. What distance has actually been covered?

**Math**

The Japanese Nozomi averages 162 miles per hour. About how many miles would it take the Nozomi to travel 119 miles? Thanks, (If you could please show me how to do it)

**Physics Classical Mechanics**

Double star system answer - 9.859*10^17 seconds; keep on getting bungee jump wrong; I might be using the wrong equation. setting the equations to: 1/2*k*x^2=m*g*h; k = 2*m*g*h/x^2

**physics**

Use the answer from a (R) to calculate the escape velocity

**physics**

Geosynchronous Orbit Equation: R^3=(T^2)*(G)*(M_p)/(4)*(pi^2) Time is in seconds T=1.6 earth days=38.4hrs=13824seconds or 1.38*10^4 seconds this the equation i I used to get my answer. b)V-escape=sqrt(2)*(m_planet)*G/R to do b you need a to solve; do not forget to take cubed ...

**physics**

a. 1.29*10^8; b. 8.2547 km/sec

**Biology/Chem**

how?

**physics**

8.01 homework. I have difficulty with question no. 2. all my equations do not work-Rough Surfaces. Also, the period of oscillation got part a the rest is confusing and my answers do not check out. I thought this was a very difficult assignment to say the least. So far, I am ...

**chemistry**

1129 nm

**Biology**

Father has red/green color blindness and is a hemophiliac. Mother is normal. Have two female children (Both are probably carriers). One female offspring marries a normal male. The question is what is the probability that their son is both color blind and hemophiliac? ...

**Math**

Lori's car gets about 28 miles per gallon of gas. About how many gallons of gas does Lori's car use for each mile driven? How do you know?

**Chemistry**

How many grams of sodium sulphate (mol. wt. 142) are required to make 1.2 liters of 0.5N solution

**math**

Dents and Dings Auto Body buys paint with a list price of $29,000. If the supplier extends trade discounts of 30/35/20, what is the trade discount amount?

**science**

How much hot air in SCFM is needed to heat up water from 60F to boiling point. The hot air is 350F.