# Posts by Jeff

Total # Posts: 830

**physics**

-Using a digital camera, you are taking a picture of your 1.80meter-tall friend standing at a distance of one meter from you. From the camera manual, you learned that the size of the sensor (electronic film) is 6mmx8mm. In other words, the sensor is rectangular with 6mm on one...

**10th grade**

Mixing the two is simply and acid base reaction. CH3COOH + NaHCO3 ---> CH3COONa + H2CO3 That last product is carbonic acid which quickly decomposes into carbon dioxide and water: H2CO3 ---> H2O + CO2 The CO2 is what you see foaming and bubbling in this reaction.

**college/ vet assistant**

relating to the biting surface of a molar or premolar tooth

**college/ vet assistant**

Lingual describes speech sounds formed with the tongue

**Algebra**

Ok! Have a good night and thanks for the help!

**Algebra**

That makes sense..High School?

**Algebra**

Are you a math teacher? Just wondering?

**Algebra**

So which is the correct method? Switching the original, or just using variables as i did to make the equation true 4x-y = 7 4(2) - 1 = 7 (2,1) 4(3) - 5 = 7 (3,5) 4(4) - 9 = 7 (4,9) Which method is correct? Or does it not matter because the equation has infinate solutions? Thanks!

**Algebra**

Even though you switched it to the y = 4x - 7? Is this all the same or is the -7 and 7 the constants changed? Thanks

**Algebra**

Would (2,1) (3,5) and (4,9) work as well? Thanks!

**Algebra**

4x - y = 7 I need ordered pairs for this linear equation, I was wondering of some possible solutions. Thanks!

**physics**

Charges A through E have a charge of either + or - 5mC. They are placed at regular intervals along a semicircle of radius 7cm. Find the magnitude and direction of the force exerted on an electron placed at the center of the circle. Find the electric potential at the center of ...

**chemistry**

A + B -> C + D (reversible reaction) a 2L container contains 1 mol of C, 1.6 mol of D, 0.8 mol of A snd 0.8 mol of B. Calculate the equillibrium composition of the reaction. Kc =0.065 I think C and D are forming A and B because there is higher concentration of C and D. So ...

**chemistry**

A + B -> C + D (reversible reaction) a 2L container contains 1 mol of C, 1.6 mol of D, 0.8 mol of A snd 0.8 mol of B. Calculate the equillibrium composition of the reaction. Kc =0.065 I think C and D are forming A and B because there is higher concentration of C and D. So ...

**Math**

Express 5.6 x 10 (minue two squared) in standard notation

**Math**

Please help me with this question: What is the supplement of 125degrees?

**math**

wouldn't the answer be 1?

**chemistry**

NH4HS(s)-> NH3(g) + H2S(g) What direction does the equillibrium shift when NH4HS is added? I think that the equillibrium won't shift since we are adding a pure solid and pure solids are not included in the equillibrium expression. Just want to make sure.

**physics**

A frictionless track with a loop of radius 36 cm sits on a table 0.9 meters above the ground. If a 0.15 kg object just makes the loop, how high above the table did the object start and how far from the table does it land? Can you check my work Mgh - Mg(2R) = 0.5MV^2 gh - 2gR...

**physics**

A 4.74 kg spherical ball with radius 1.4 cm rolls on a track with a loop of radius 39 cm that sits on a table 1.2 meters above the ground. The last 1 meter section of the track is horzontal and is not connected to the rest of the track. 0.33 meters of this section of the track...

**physics**

A 4.74 kg spherical ball with radius 1.4 cm rolls on a track with a loop of radius 39 cm that sits on a table 1.2 meters above the ground. The last 1 meter section of the track is horzontal and is not connected to the rest of the track. 0.33 meters of this section of the track...

**physics**

A bench is made of a 3 meter long plank with a mass of 12kg and 2 sawhorses(each 0.2m from an end).There are two boxes on the bench. A 15kg box is 0.8 meter from the left hand side. A second box is 0.5 m from the right hand side. What would the mass of the second box have to ...

**physics**

A bench is made of a 3 meter long plank with a mass of 12kg and 2 sawhorses(each 0.2m from an end).There are two boxes on the bench. A 15kg box is 0.8 meter from the left hand side. A second box is 0.5 m from the right hand side. What would the mass of the second box have to ...

**Math**

* disregard the caffeine comment. sorry about that.

**Math**

I have this exact same question, but in my assignment I'm told I have to make a table of values, graph whatever it is, find the x&y intercepts, find the domain and range, determine whether it's increasing or decreasing, the equation of the asymptote, and what is the ...

**math**

I need Help With Time

**physics**

A 5 kg box is pushed against a K= 40 n/m spring on a horizontal surface and the spring is compressed 0.12m. The box is released and travels for 1.4 meters before comin to a stop. What is the coefficent of friction between the floor and the box. How fast was the box moving when...

**physics**

a block is held 1.3m above a spring and is dropped.The spring compresses 6cm before sending the ball into the air. How fast is the ball going when it hits the spring? What is the spring constant? How high in the air does the ball go after hitting the spring?

**physics**

a box whose mass is 0.3 kg is pushed against a spring(k=40n/m) on a horizontal surface and the spring is compressed 0.12m. The box is released and travels for 1.4 meters before coming to a stop. What is the coefficient of friction between the floor and the box? How fast was ...

**Science**

How is it that clothes can dry on the clothesline at temperatures well below freezing?

**physics**

An arrow with a mass of 0.12 kg is pulled back in a bow. After being held still, it is let go, moving at 23m/s after the 0.51meters in which the arrow is in contact with the bow string? What work was done on the arrow by th bow string? What force was exerted by the archer to ...

**Math**

[(x^3)+(2x^2)-x-2]/(2x-5)

**Math**

we want tacos!!!!

**Physics**

how do you solve for v ?

**Geometry**

AB = 5x+3 and aback =3x + 19

**physics**

what happen to the value g (free fall). If the rocket has launch from Earth to moon with the constant velocity. What if the rocket acclerating?

**physics**

An old-fashioned single-play vinyl record rotates on a turntable at 34.0rpm . What are the angular velocity in rad/s and the period of the motion?

**Chemistry**

Consider a 27.5g piece of ice at 0.00C. a) how much heat is required to convert the ice to water that is also 0.00 C? b) how much heat would be required to warm this water from 0.00 C to 17.50 C? I don't understand the process of how to go about solving this problem.

**chemistry**

a) how much heat is required to convert the ice to water that is also 0.00 C? b) how much heat would be required to warm this water from 0.00 C to 17.50 C? HELP!! I think the fusion is 333 J/g at 0 C... But I'm not sure what to do with that.

**Chemistry**

is Hf triangleH'f?? and if so would the value be -285.83? for b, would we want the specific heat of h2o (l) or (s)?

**Chemistry**

Consider a 27.5 g piece of ice at 0.00 C. a) how much heat is required to convert the ice to water that is also 0.00 C? b) how much heat would be required to warm this water from 0.00 C to 17.50 C? HELP!! I think the fusion is 333 J/g at 0 C... But I'm not sure what to do ...

**English**

Is the following sentence (a) fragment, (b) run on sentence, (c) commas splice, (d) complete sentence? Although zone-delivered pricing is a plan under which customers living outside the seller's primary trading area pay the cost of delivering their purchases to them

**physics**

A rocket is launched straight up with constant acceleration. Four seconds after liftoff, a bolt falls off the side of the rocket. The bolt hits the ground 6.10s later. What was the rocket's acceleration?

**Physics**

n apple and feather free fall in a evacuated chamber. The apple and feather are released from the top. Suppose the camera opened flash every 1 s. (1)Suppose A1 is the distance from t = 0s to t = 1 s, A2 is the distance from t = 1s to t =2s, A3 is the distance from t = 2s to t...

**biology**

Why does cell need enzymes?

**Chemistry**

15 mols

**Social Studies**

madistat serverriov

**Social Studies**

madistat serverriov

**Algebra**

The Perimeter of a rectangular porch is 72 feet. The porch's length is 5 times its the width. You want to determine the dimensions of the porch?

**math (calc)**

At noon, ship A is 150 km west of ship B. Ship A is sailing east at 35 km/h and ship B is sailing north at 25 km/h. How fast is the distance between the ships changing at 4:00 pm. Find the intervals of increase or decrease find the local maxiumum and minimum values find the ...

**english**

in uncle toms cabin why does eliza think its safe to stop for food at the farmhouse

**English**

Can someone use the word myriad in a sentence? I know it's kind of a dumb question but I'm really stuck

**history**

this is a question about anne frank who was martin kelper? can not find anything about him

**research writing**

This is helpful, thanks Christine

**research writing**

thank you

**research writing**

how do you know when sources are reliable?

**grade 5 math**

the grade 5 class decided to collect cans of food to donate to the food bank .After the 1st week ,they had collected 8 cans . The next week they collected 11 more . By the 3 rd week they had 31 cans Following this pattern how long will it take for them to reach there goal of ...

**college algebra**

I'm not sure, but my answer would be 15. you multiply 18x4=72, 9x3=27, 3x2=6 add them together, it makes 105 divided by 3x2+1=7, so 105 divided by 7=15. I hope it helps

**college algebra**

Could you help me with this long division problem of a polynomial? 18x4+9x3+3x2/3x2+1

**history**

Thanks

**history**

I think it's "B"

**history**

The great French historian Jules Michelet (1798-1874) sympathized with the French Middle Ages and with the Revolutionary epoch in France, yet he wrote his best work on the despotic French monarchy, which he despised. 5) The statement above, if true, would most clearly support ...

**history**

The great French historian Jules Michelet (1798-1874) sympathized with the French Middle Ages and with the Revolutionary epoch in France, yet he wrote his best work on the despotic French monarchy, which he despised. 5) The statement above, if true, would most clearly support ...

**Math**

How do you find surface area of a box?

**Algebra**

(x-3)/5 = (x-3)/x The x-3 is over the 5 and the other x-3 is over the x... I know to cross multiply so I would get 5(x-3)= x(x-3) But then would i just divide (x-3) by both sides? I would assume that's what to do, but the only reason I ask is because my book says the ...

**Algebra**

oops it didn't write the question like i wanted it to, here I'll fix it 4x/x^2-9 - 5x/x^2+4x-+3

**Algebra**

I have one more question I need to ask about algebra, this one is a perform the indicated operation question. 4x 5x ----- - ---- x^2-9 x^2+4x-+3 I am really confused on the -+3 part, I don't know if my teacher made a typo or what, because without the - in that part it ...

**Algebra**

Ooo ok thanks so much, I got it :D

**Algebra**

Hi I am in need of help, please... The question says to perform the indicated operation. x^2+2x-3/x^2-9 Divided By x^2-1/x^3-27 I put divided by in the middle to show that it is dividing two rational expressions.

**History**

Did Lyndon Johnson think Eisenhower was a good president?

**Math**

The least common multiple of 96 and 108?

**Calculus I**

A tank in the shape of an inverted right circular cone has height $ 10$ meters and radius $ 8$ meters. It is filled with $ 6$ meters of hot chocolate. Find the work required to empty the tank by pumping the hot chocolate over the top of the tank. Note: the density of hot ...

**calculus**

A ball of radius 10 has a round hole of radius 5 drilled through its center. Find the volume of the resulting solid.

**calculus-differential equation**

Thanks so much. I've been struggling with that thing for days!

**calculus-differential equation**

Consider the differential equation: (du/dt)=-u^2(t^3-t) a) Find the general solution to the above differential equation. (Write the answer in a form such that its numerator is 1 and its integration constant is C). u=? b) Find the particular solution of the above differential ...

**math**

looking to reduce to lowest term 1) 3+x(4+x)/3+x i got 4+x 2)3a^2-13a-10/5+4a-a^2 i got could not reduce any help would be great

**math**

sorry next one is 3a^2-13-10/5+4a-a^2 i got cannot reduce

**math**

a couple more 1) 3+x(4+x)/3+x i got 4+x

**math**

thanks i got could't reduce on the second one the first one the denominator both numbers are to the second power does that matter

**math**

trying to reduce to simpilest form 1.t-a/t^2-a^2 i have 1/2(t+a) 2.3y^3+7y^2+4y/y^2+5y+4 i have cannot reduce thanks

**Algebra 1**

The formula for direct variation is y = kx, where k is the constant of variation. For slope, use y - y1 = m(x-x1)

**Math x-int's**

Wow... that's a long process. Thanks for the help!

**Math x-int's**

How do I algebraically find the x-intercepts for this equation y = x^3 - 3x^2 + 3. I know I need to plug in y = 0 to solve for x. x^3 - 3x^2 + 3 = 0 But where do I go from there? I don't think I can factor, and I don't think I can use the quadratic formula.

**civics**

Gave 2/3 majority of the 13 colonies.

**civics**

1) Did not give enough power to the federal government 2) No national currency

**geography**

elevation

**Math**

also apply the rules of divisibility

**Math**

I'm tutoring someone 1st year arts math and they have been given this difficult question that I cannot mind boggel. It goes as follows: There are 6 couples at a party. Each can shake another persons hand once, but they can never shake their spouses hand. At the end of the ...

**Math**

Im really unsure about this question i have not been taught this type of graphing before. It is a tough one.

**tech math**

if some one could solve this so i can see if i'am doing it right 8x+y+z=1 7x-2y+9z=-3 4x-6y+8z=-5 thanks

**Chemistry**

In alcohol fermentation, yeast converts glucose to ethanol and carbon dioxide C6H1206 -----> 2C2H5OH + 2CO2 If 5.97 g of clucose are reacted and 1.44 L of CO2 gas are collected at 293 K and .984 atm, what is the percent yield of the reaction?

**math**

What is the question?

**Reading**

It's been years since I read the book but wasn't Johnny cleared of charges in the book? Wasn't it ruled that he acted in self-defence?

**chemistry**

I need the equilibrium constant for the following reaction @ 25 deg. C 2CaCO3 (calcite) + Mg2+ <==> CaMg(CO3)2 (dolomite) + Ca2+

**geography**

larger land area- california or missouri?

**English**

what are the properties of protagonist

**equations**

80

**Maths**

16n+7

**physics- what did i do wrong**

If the bus is 100 meters ahead of the car and the bus is travling at 65 km/hr and the car at 78km/hr, how long will it take the car to catch the bus? I used the following formula, but was informed my answer was wrong. 100m + (t) 65km/hr = 0 + (t)78km/hr and solved for (t). t...

**physics**

i need help with this one! A 100KHz oscillator that's followed by a doubler and two triplers will produce an output of frequency.... a.) 180 kHz b.) 500 " c.) 800 " d.) 1.8 "