# Posts by Benjamin

Total # Posts: 90

**Chemistry**

An 0.850 g sample of a mixture of LiH and CaH2 was reacted with H2O and the H2 gas produced, 1.20 L, was collected at STP. What mass % of the original mixture was LiH?

**Stats**

A sociology professor assigns letter grades on a test according to the following scheme. A: Top 14% of scores B: scores below the top 14% and above the bottom 55% C: scores below the top 45% and above the bottom 17% D: scores below the top 83% and above the bottom 6% F: bottom...

**Physics**

A typical photovoltaic cell delivers 4.2×10?3 W of electric energy when illuminated with 0.15 W of light energy. What is the efficiency of the cell?

**Geometry **

On a coordinate grid map jaff's house is located at (9,5.). Hannah's house is at (-5,-5). Kenya's house is at the midpoint between Jeff and Hannah's. what's the distance.

**Math**

Thank you Ms. Sue! :)

**Math**

So what I'm getting is: 22 + 13 = 35 35 ÷ 7 = 5 degrees per hour Is this correct?

**Math**

One day at 3 am., the temperature was -13 Fahrenheit in Kodiak, Alaska. At 10 am the temperature was 22 Fahrenheit What was the average change in temperature per hour?

**Maths**

the second term of a GP is 36 more than the first term. The difference between the 4th and the 3rd terms is 900. Calculate the common ratio and the first term of the GP

**Chemistry**

In this reaction: 2 HCl + Na2CO3 -> H2O + CO2 + 2 NaCl The HCl was diluted from 2M to 0.8M and I currently have 0.020 L of it. There is also Na2CO3. What would be four causes for a large error percentage? Is it possible that some of the HCl evaporated?

**Chemistry**

For the reaction of 2 HCl + Na2CO3 -> H2O + CO2 + 2 NaCl, how can I visually identify the limiting reagent, without any calculations? If I have a very high percent yield, what would be a good reason for it, considering that the HCl was diluted to 0.050 L at 0.8 M ...

**precalculus**

How do you find the major and minor axis of an ellipse?

**precalculus**

can you explain what the equation y = a(x - h)2 + k, a ? 0 means and what it represents?

**Algebra**

Your test scores in one class are 8484 and 88. What possible scores can you earn on your next test to have a test average between 86 and 90, inclusive

**biology**

assignment

**Math**

If q^1/2 = x, x^-1/4 = 4^-1/2, what is the value of q? Plz help me!

**maths**

15

**maths**

The area of a rectangle is 60 cm squared and its perimeter is 38cm. Find the length and width of a lectangle

**math**

tanA=opposite÷adjacent Adjacent=opposite÷tanA =180×tan27 =91.715cm Therefore length of his shadow is 91.715cm

**Physics**

A uniform rod 2m long has a force 80N applied downward at one end. Another force 6N applied downward at the other end. At what point under the rod should the pivot be placed to keep it in equillibrim?

**engineering**

important of ict in electrical studies

**Math algebra**

If a mixture calls for 3 cups of flour to 2 cups of water. Then how much water is needed for only 2 cups flour??

**English**

As a young girl growing up in Africa, the narrator came into contact with many native Africans. Those who found themselves in the employ of her family were the fortunate ones, she believed. While she acknowledged that they exist, the narrator took for granted the servant-like ...

**business math**

out of 7 men and 5 women, 5 members of a committee are selected. in how many ways can this be done if (a) there must be exactly 3 men (b) there must be more women than men?

**Statistics**

90% of population is unemployed. Assume 10 employable people are to be selected randomly. what is the expected number of those unemployed.

**Physics**

Plz, i need the workings. An object is acted upon by two forces of 5N and 12N. Calculate the resultant of two forces if the forces acting perpendicular to each other

**Physics**

Coefficient of kinetic friction =F/R=ma/mg Which is a/g since the mass is equal 0.64=a/10 a=6.4m/s NB. g=10m/s Recall v=u+at V=15+6.4×2 V-15=12.8 V=12.8+15 V=27.8m/s

**physics(lens)**

Two converging lenses, A and B,with focal length F1=20cm and F2=25cm,are placed 80cm apart. An object is placed F0cm in front of the first lens. 1)Determine the position of the final image formed by the magnification of the two lenses. 2)Determine the magnification of the ...

**physics(measurement)**

Thank you.

**physics(measurement)**

What accurate method can be used to determine the thickness of a coin. Explain pls..

**physics(lens)**

Two converging lenses, A and B,with focal length F1=20cm and F2=25cm,are placed 80cm apart. An object is placed F0cm in front of the first lens. 1)Determine the position of the final image formed by the magnification of the two lenses. 2)Determine the magnification of the ...

**physics(kinematics)**

A police officer in a patrol car parked in a 70 Km/h speed zone observes a passing automobile might be intoxicated,the officer starts his car,accelerates uniformly to 90 Km/h in 8s ,and maintaining a constant velocity of 90 Km/h,overtakes the motorist 42s after the automobile ...

**physics(capacitors)**

A sheet of paper 40mm wide and (1.5 x 10^-2) thick is placed between a metal foil of the same width is used to make a 2.0 UF capacitor. If the dielctric constant(relative permitivity of the paper is 2.5 ,what length of paper is required?

**math**

665,830 my answer

**physics**

a cell of emf 10v and internal resistance 2ohms is connected in series with an ammeter resistance 0.5ohms and a load of resistance 7ohms. Calculate (A) the potential difference across its terminal (B)the voltage drop

**Calculus**

t is greater than 0.5, not 2

**physics**

Coefficient of friction=F/R=ma/mg=a/g Coefficient of friction of rubber on dry concrete=0.6>>0.85 So to make it accurate coefficient=0.75 0.75=a/10 a=7.5m/s^2 Recall that.. v^2=u^2+2as v^2=0^2+2×7.5×30 v^2=450 v=√450 v=21.2m/s (b)coefficient of ...

**social studies**

THANK YOU GUYS SO MUCH. YEE. YOU ARE THE BEST

**math**

A tomato plant has grown 5 inches over the last 9 days at this rate how many inches will it grow over the next 15 days

**Math**

A fence is to be built to enclose a rectangular area of 310 square feet. The fence along three sides is to be made of material that costs 3 dollars per foot, and the material for the fourth side costs 14 dollars per foot. Find the dimensions of the enclosure that is most ...

**science**

suppose 125g of ethanol at 25C is mixed with 255g of ethanol at 84C at constant atmospheric pressure in a thermally insulated vessel. What is the Ssys for the process. The specific heat capacity for ethanol is 2.42 J/g K. Answer in units of J/K

**science**

A point charge of 0.5C is brought from infinity to a point A in free space.how much work is required to this?

**science**

two parallel plates are separated by a dielectric of thickness 2mm and a dielectric of constant 6.if the area of each plate is 40cm2 and p.d between them is 1.5kv,find the capacitance,the energy stored by the capacitor and the ratio of the capacitance if the dielectric is ...

**CHEM, HELP!!**

1. If the energy of a photon is 1.32 × 10^-18 J, what is its wavelength in nm? 2. The energy of an electron in the hydrogen atom is determined by what?

**Accounting**

12,069

**Community technical college**

Given that 1st term of an A.P is 7 and it's 10th term is twice the second term,calculate the (a) 19th term (b)sum of 28 terms (c) difference between 9th and 6th terms

**math**

if i ride my bike for 5.22 km and my whell turns 1.45 m how many times will it rotat

**Calculus**

Find a cubic function f(x) = ax^3 + bx^2 + cx + d that has a local maximum value of 3 at x = −2 and a local minimum value of 0 at x = 1.

**geometry**

i have to proof that segment ad is congruent to segment ce. my givens are that segment ab is congruent to cb, that fd bisects ab and that fe bisects cb. the shape is a triangle

**collage math**

what is the difference of two cubes

**university of phoenix**

if someone scored two standard deviations above the mean on a standard test where the mean =100 and the standard deviation = 15, what is the person's numerical score?

**physics**

3.3m/s

**Algebra**

What do I do if a compound inequality contradicts itself? Do I put down empty set, or what?

**3 grade math**

64÷2=32-8=24-8=16

**Medical Coding 2**

Answer I came up for Ilsa and Anonymous is 943.29 (multiple, because it's both arms) E924.8 (where: other-burning by: hot object NOS) E849.0 (where) E015.2 (activity) E000.8 (who) 99251 (inpatient - hospital-based clinic) 16030 (large dressing change)

**3rd grade math**

Just multiply 8 and 5 you will get 40 when you add two zeros you get 4000.Check your answer on paper, If you wish to

**medical Coding**

my take on it is: 972.9, E950.4, E000.8, E849.7, 99281, 96365, 96366x2, J1610x20, J7070

**math**

Find the angles of atriangle which are in the ratio 2:3:5. Could someone explain how to do this also. Thanks.

**ISB**

Find the angles of atriangle which are in the ratio 2:3:5. Could someone explain how to do this also. Thnaks.

**math**

In a right angle triangle, two acute angles are in the ratio 2:3. Find the angles?

**English**

Thank you, your responses helped my very much.

**English**

I was wondering what you all may think about video games and their effects on children playing them? Are the children becoming more violent? What do these games do t a child's psyche?

**physics**

hysics - Joy, Friday, June 14, 2013 at 6:14pm 1.a2.b3.c4.a5.c6.c7.c8.a9.a10.c11.c12.d13.b14:a15.d16.c17.b18.c19:d20:b.

**Physics**

An airplane, traveling 90 degrees, at 100 meters per second is blown towards 180 degrees at 50 meters per second. What is the resultant velocity and direction?

**Math**

Find the difference of all the prime numbers between10 and25 arranged in descending and ascending order.Give your answer in words.

**math**

Find the GCD OF 121, 151 And 211

**Math (difficult)**

The value of a new car purchased for $28,000 decreases 8% per year. Write an exponential decay model for the value of the car. Use the model to estimate the value after 5 years.

**Chemistry**

I don't knw it. Buh pls m interested In d solution

**algebra II**

Using the given equations, find the point of intersection. 6x - 2y = 5 and 3x - y = 10

**college HIST**

The Age of Jackson is often seen as a turning point in American politics, one where we turn from a politics where few could vote or hold office to one where many could. Define Jacksonian Democracy and show how it changed the political system from what came before. Do the major...

**Really bad interpreter**

I think it means that the american people like doing things in a very simple manner and don't like to make such a big deal over anything to avoid confusion or problems. They rather be straight forward with one another than lying and tricking people in order to get what ...

**geometry**

to the nearest integer how long is the diagonal square with the side of 12

**Form1/9th grade**

A mixture contains solids: Aluminium,camphor and sugar.Explain how you would obtain a sample of solid sugar from the mixture.

**Algebra**

There is a table of values for the function f. They read: x=3, f(x)=4 x=4 f(x)=5 x=5 f(x)=6 x=6 f(x)=3 x=7 f(x)=5 x=8 f(x)=7 What is the value of 2f(5)-f(4)? I did this wrong obviously, but what I did was figure out the function of five from the table (4), and multiplied that ...

**Satistics**

In North American, female adult heights are approximately normal with a mean of 65 inches and a standard deviation of 3.5 inches. a.) If one female is selected at Random, what is the probablility that shes has a height 70 inches or higher? b.) The heights of 50 females were ...

**english**

hosted scolded called punted pressed landed stamped bumped honked dented crunched winked spelled thrilled mended trashed twisted banged

**physics**

For the velocity remember that the work done on the ice by the spring is calculated as the change in Kinetic Energy of the block or: Work = (1/2)mass*velocity(final)^2 - (1/2)mass*velocity(initial)^2 Plug in your Work answer from part a and substitute into the above equation. ...

**algebra with pizazz pg 40 riddle**

I need help with problem E: 2v + 18 = 16 - 4(v + 7)

**4th grade math**

That is not 4th grade homework

**Managerial Economics**

unable to answer

**physics**

Vector A has a magnitude of 8.00 units and makes an angle of 45.0° with the positive x-axis. Vector B also has a magnitude of 8.00 units and is directed along the negative x-axis. Using graphical methods, find (a) the vector sum A + B and (b) the vector difference A –...

**algebra**

Militsa has 4 times as many nickels as dimes. Their total value is $8.10. How many of each coin does she have

**Math**

What is the maximum height reached by the ball? If a baseball is projected upward from ground level with an initial velocity of 64 feet per second, then its height is a function of time, given by s= -16t^2 + 64t

**Music**

What is the Mongolian equivalent to the guitar called? I've searched under Mongolian instrument lists, but I couldn't find it. Thanks!

**History**

and that i don't have a textbook, nor any notes,

**History**

I know, i just wanted to find out a little more about the french revolution, and im clueless, that's all

**History**

uhhh.... Im clueless...

**History**

About the French Revolution. You are a member of the Third Estate. Prepare a speech for the meeting of the Estates General, explaining all your problems. Minimum 300 words

**Misc./Project/Art**

I like the poster idea, but the problem is that I don't have access to any of those resources. I'm away from home so I don't have access to pictures or poster boards.

**Misc./Project/Art**

Hello, I need to come up with a very creative way to express who I am to a certain group of people. Unfortunately, I'm not very good at art, so I would have to come up with a new way. Are there any ideas you might have? Thank you very much for your help.

**Math, Geometry and Physics**

less than 270m or more than 3480m.