Tuesday
September 23, 2014

Posts by Hannah


Total # Posts: 2,852

Math(Please check, urgent)
Yes but I always set it up incorrectly. so [76.95 +/- sqrt (76.95^2 - 4(4.9)(-1.5)] / 9.8 Did I set this up correctly?
September 17, 2012

Math(Please check, urgent)
y=1.5 + 76.95t-(1/2)(9.8)t2 = 303.6 I am not sure how to arrive at this answer. I am confused because there is a t and a t^2. Thank you for your help!
September 17, 2012

physics
A motorboat accelerates uniformly from a velocity of 6.6 m/s to the west to a velocity of 1.3 m/s to the west. If its acceleration was 2.1 m/s2 to the east, how far did it travel during the acceleration? Answer in units of m.
September 17, 2012

physics
A motorboat accelerates uniformly from a velocity of 6.6 m/s to the west to a velocity of 1.3 m/s to the west. If its acceleration was 2.1 m/s2 to the east, how far did it travel during the acceleration? Answer in units of m.
September 17, 2012

Math(Please answer)
This is the same equation as before just with different numbers. y=yo + (vo sin Q) t - 1/2gt^2 This time the numbers are: 0 = 1.005 + (3.021 sin 30)t - 1/2(9.8)t^2 4.9t^2 - 1.5105 - 1.005 = 0 This is the part where I am stuck. Did I do this correctly? sin 30 = 0.50 X 3.021 = 1...
September 15, 2012

Physics(Please answer, thank you)
How do you determine the ymax? I know you have to use Q which I have values that were given to me as well as vo values but I am not sure what to do with these values. Physics - drwls, Saturday, September 15, 2012 at 1:29am Define your terms. I have no idea what you are talking...
September 15, 2012

Physics(Please answer, thank you)
How do you determine the ymax? I know you have to use Q which I have values that were given to me as well as vo values but I am not sure what to do with these values.
September 14, 2012

Math
This is the same equation as before just with different numbers. y=yo + (vo sin Q) t - 1/2gt^2 This time the numbers are: 0 = 1.005 + (3.021 sin 30)t - 1/2(9.8)t^2 4.9t^2 - 1.5105 - 1.005 = 0 This is the part where I am stuck. Did I do this correctly? sin 30 = 0.50 X 3.021 = 1...
September 14, 2012

Algebra 2 (Math)
If A=(0,-17), B=(4,-5), and C=(12, -1), what is the length of the altitude from C to AB
September 14, 2012

Math (Algebra 2)
The points (2,1), (4,0), and (-4,k^2) are collinear. What is the value of k?
September 13, 2012

Physics(Please help)
How do you determine the ymax? I know you have to use Q which I have values that were given to me as well as vo values but I am not sure what to do with these values.
September 13, 2012

Math
Thank you!
September 13, 2012

Math
I have to calculate the percent error for my experiment and I just wanted to make sure that I am doing it correctly. My value was 1.376 and the accepted value was 1.371 so I did [1.376 - 1.371] / 1.371 = 0.0036 X 100 = 0.36% Did I do this correctly?
September 13, 2012

Math(Please check)
This is the same equation as before just with different numbers. y=yo + (vo sin Q) t - 1/2gt^2 This time the numbers are: 0 = 1.005 + (3.021 sin 30)t - 1/2(9.8)t^2 4.9t^2 - 1.5105 - 1.005 = 0 This is the part where I am stuck. Did I do this correctly? sin 30 = 0.50 X 3.021 = 1...
September 13, 2012

Chemistry
Thank you very much!!
September 13, 2012

Chemistry
I have to draw a skeletal, kekule, and lewis structure for this but I am having some difficulty because there is so much going on in the structure. Do you know of any websites that could show me examples of these types of condensed structures?
September 13, 2012

Chemistry
In the condensed structure CH3CH2CHCH double bonded to CHCH(CH3)2 ! CH3 What does it mean when the CH3 is in () followed by the 2?
September 13, 2012

Chemistry(Please check)
Last question, I just want to make sure I understand the concept of hybridization. For carboxylic acid the hybridization is: CH3= sp3 because there are only single bonds COOH= Sp2 because the oxygen is double bonded to the C Is this correct? Thank you for checking my work!
September 12, 2012

Chemistry(Please check)
What is the hybridization of each carbon in the molecule of ethanol. CH3 = sp3 CH2OH = sp3 I think that the carbons are all sp3 because there are only single bonds in this molecule. Is this correct?
September 12, 2012

Math(Please help)
Ok so just to make sure I take the square root of 1.005/4.9= 0.45 which would be both positive and negative but I only take the negative correct? Thank you for your help. This makes sense now because I have to compare this value to the actual which was 0.44 so I am not to far ...
September 12, 2012

Math(Please help)
The 1.005 was the value given for yo, the angle given was 0 and vo was 3.107. The t I just took from the equation y=yo + (vo sin Q) t -1/2 gt^2. I need to find t using this equation but I wasnt sure how to do it.
September 12, 2012

Math(Please help)
Using the equation y=yo + (vo sin Q) t - 1/2gt^2 I have to find t. The values for y, yo and vo were given to me. So I set the equation up like this: 0=1.005 + (3.107 sin 0) t - 1/2(9.8)(t^2 The sin of 0 is 0 times 3.107 is 0. So 0 = 1.005 t - 4.9 t^2 Now I am stuck. I am not ...
September 12, 2012

Chemistry
Oh ok I understand thank you!
September 12, 2012

Chemistry
Sorry didnt get to finish. CH2 CH2 ! ! CH2 CH2 Each CH2 going from left to right has a single bond as well. I think this is an alkane but I am not sure. I only think this because it only has single bonds of hydrogen and carbon. Is this correct?
September 12, 2012

Chemistry
Classify the following: 1) CH2 CH2 ! ! CH2
September 12, 2012

Chemisty
Classify the following: 1)CH3CHCH2COOH ! CH3 I think this is a carboxylic acid because of the COOH attached. Would you agree?
September 12, 2012

chemistry
ok thank you!
September 12, 2012

chemistry
Is that a functional group?
September 12, 2012

chemistry
Classify the following: 1) CH3CN There is a triple bond between the C and N. I am really not sure what compound this is.
September 12, 2012

Chemistry(Please check)
Thank you very much!!
September 12, 2012

Chemistry(Please check)
Classify the following as ether, ketone, ester, amide, etc. 1) CH3CH2CNH2 !! O The !! represents a double bond and it is below the CN I think this is an amide. 2) CH3COCH3 !! O The doube bond is below the CO I think this is an ester. 3) CH3CCH3 !! O The double bond is below ...
September 12, 2012

Physics(Please help)
using the equation y=yo + (vo sin Q) t - 1/2gt^2 I have to find t. The values for y, yo and vo were given to me. So I set the equation up like this: 0=1.005 + (3.107 sin 0) t - 1/2(9.8)(t^2 The sin of 0 is 0 times 3.107 is 0. So 0 = 1.005 t - 4.9 t^2 Now I am stuck. I am not ...
September 12, 2012

Physics(please check)
Please diregard. Thank you!
September 12, 2012

Physics(please check)
X=(Vo cos Q) t X=(3.107 cos 0)(0.443) I just wanted to make sure that I put this equation into my calculator correctly. I have a TI-30 so first I put in 0 then cos to get 1. Then I multiplied by 3.107 to get 3.107 and then multiplied by 0.443 to get 1.376 . Did I do this ...
September 12, 2012

Math
Plz help lisa is painting a fence that is 26 feet long and 7 feet tall. A gallon of paint will cover 350 square feet. Write and solve a proportion to determine how many gallons lisa will need.
September 12, 2012

Math
An assembly line worker at rob's bicycle factory adds a seat to a bicycle at a rate of 2 seats in 11 minutes. Write a proportion relating the number of seats s to the number of minutes m. At this rate how long will it take to add 16 seats? 19 seats?
September 12, 2012

Chemistry(Please check)
Classify the following functional groups: 1)CH3CH = CH2 I think this is an alkene 2) CH3CHCH3 I think it is an alcohol. ! OH Would you agree with my answers?
September 11, 2012

Organic chemisty(Please check)
Do you have to show the R? I need to show the kekule structure for CH3CONH2. I know how to start it off Im just not sure about the NH2. The N would be connected to a carbon on the left side correct?
September 11, 2012

Organic chemisty(Please check)
Ok thank you so for something like an amine with an NH2 would I show it the same way N with an H above and below??
September 11, 2012

Organic chemisty(Please check)
When drawing a kekule structure for CH3CH2OH(alcohol) do I leave the OH at the end just like it is (OH) or would it be shown as O-H? I know that to start of it would be -C- with an H on the top and the bottom as well as the left side and then connected to the C would be ...
September 11, 2012

Science
What is the difference between the lithosphere and the asthenosphere? In which layer is each located?
September 11, 2012

Physics
Please I need help with this problem
September 11, 2012

chem
i am also having trouble iwth this one The atomic masses of barium-137, nitrogen-14, and titanium-48 are 136.905821 amu, 14.003074 amu, and 47.947947 amu, respectively. For each isotope, calculate the nuclear mass, the nuclear binding energy, and the nuclear binding energy per...
September 11, 2012

chem
Each beta particle has an energy of 2.51 10-14 J, and 7.5% of the radiation is absorbed by the person. Assuming that the absorbed radiation is spread over the person's entire body, calculate the absorbed dose in rads and in grays i got 3.27e-5 for grays but its wrong
September 11, 2012

Chemistry
A watch is to be electroplated with gold. - provide a solution that would make a suitable electrolyte for this cell. I'm not quite sure how to figure out what the electrolyte solution is made of. Any help you can give me would be wonderful!
September 10, 2012

Chemistry
A watch is to be electroplated with gold. - provide a solution that would make a suitable electrolyte for this cell. This is the only question I'm having a little trouble with. I'm not quite sure how to figure out what the electrolyte solution is made of. Any help you ...
September 9, 2012

Science, Chemistry
What is the volume of 75.65 grams of zinc
September 6, 2012

chem
Cobalt-60 is a strong gamma emitter that has a half-life of 5.26 yr. The cobalt-60 in a radiotherapy unit must be replaced when its radioactivity falls to 75% of the original sample. If an original sample was purchased in October 2005, when will it be necessary to replace the ...
September 5, 2012

Math
What is the difference between the measured values of 1.05m and 1.050m? What factor of a measurement tool determines the sig figs of a measured value? The two values are different because of their sig figs, the first has 3 and the other has 4. I think that the factor of a ...
September 3, 2012

Physics(Please check)
Please diregard. I found my mistake.
September 3, 2012

Physics(Please check)
An experiment was done where a tiny steel ball was measured with a micrometer. I know I already posted a question about this before and was given a respond but after trying to fix my answers I am still lost. If someone could please review my results and tell me where I went ...
September 3, 2012

Physics(Please check)
What is the difference between the measured values of 1.05m and 1.050m? What factor of a measurement tool determines the sig figs of a measured value? The two values are different because of their sig figs, the first has 3 and the other has 4. I think that the factor of a ...
September 3, 2012

Physics(Please check)
What is the difference between the measured values of 1.05m and 1.050m? What factor of a measurement tool determines the sig figs of a measured value? The two values are different because of their sig figs, the first has 3 and the other has 4. I think that the factor of a ...
September 2, 2012

Physics(Please help, thanks)
Please disregard. I found my mistake.
September 2, 2012

Physics(Please help, thanks)
An experiment was done where a tiny steel ball was measured with a micrometer. I know I already posted a question about this before and was given a respond but after trying to fix my answers I am still lost. If someone could please review my results and tell me where I went ...
September 2, 2012

Physics(Please help, thank you)
I had to do an experiment where a tiny steel ball was measured using a micrometer. There was then a series of calculations that needed to be completed and then a percent error had to be calculated. I think that my data may be incorrect or maybe I am just not doing the ...
August 30, 2012

algr.2
solve for the equation or formula for the specified variable x+y-a=b,for y over Z
August 29, 2012

Math(Please help, thank you)
Yes my data is probably wrong I'm just not sure where I messed up
August 29, 2012

Math(Please help, thank you)
Oh ok so now to find the percent error do I subtract 120,000 from 7800 and then multiply by 100?
August 29, 2012

Math(Please help, thank you)
I am trying to calculate my percent error for an experiment conducted. I need to compare my average density calculated to the accepted average density but I am having trouble doing this because of the conversions. My average density was 0.12 g/mm^3. The accepted value is for ...
August 29, 2012

chem
As the mass of the particle is increased while the speed of the particles remains the same, would you expect the bending to increase, decrease, or stay the same? i thought it would increase because of the weight pulling it. but it was wrong
August 21, 2012

Chemistry
i have no idea how to set this problem up! please help! A 22.19-g sample of a solid is placed in a flask. Toluene, in which the solid is insoluble, is added to the flask so that the total volume of solid and liquid together is 50.0 mL. The solid and toluene together weigh 47....
August 20, 2012

chemistry/math
nevermind! i converted wrong!
August 19, 2012

chemistry/math
The density of air at ordinary atmospheric pressure and 25°C is 1.19 g/L. What is the mass, in kilograms, of the air in a room that measures 12.0 ft 12.5 ft 7.3 ft? i made ft^3 into Liters and got 8,346,211.799 then I made the grams into kilograms and set up density = mass...
August 19, 2012

DR BOB PLEASE HELP CHEM
there are no instructions... i dont see it
August 19, 2012

DR BOB PLEASE HELP CHEM
Consider the reduction of 4-t-butylcyclohexanone. If the procedure calls for 153 mg of 4-t-butylcyclohexanone, what mass of sodium borohydride should be added?
August 19, 2012

CHEMISTRY
thanks :] it is correct. D and C are the answers
August 19, 2012

CHEMISTRY
In TLC, why do you spot multiple times? Select one or more correct answers. A. To fill the capillary almost instantly by capillary action. B. So the developing chamber solvent does not evaporate. C. The higher compound concentration facilitates visualization. D. To acheive a ...
August 19, 2012

Chemistry
Consider the reduction of 4-t-butylcyclohexanone. If the procedure calls for 153 mg of 4-t-butylcyclohexanone, what mass of sodium borohydride should be added?
August 18, 2012

chemistry
There is more than one answer for this problem.
August 18, 2012

chemistry
In TLC, why do you spot multiple times? Select one or more correct answers. A. To fill the capillary almost instantly by capillary action. B. So the developing chamber solvent does not evaporate. C. The higher compound concentration facilitates visualization. D. To acheive a ...
August 18, 2012

Chem
Consider the reduction of 4-t-butylcyclohexanone. If the procedure calls for 153 mg of 4-t-butylcyclohexanone, what mass of sodium borohydride should be added?
August 18, 2012

chem
oh oops i didnt see the e3
August 18, 2012

chem
I am confused so the answer would be .87?
August 18, 2012

chem
-879.6?
August 18, 2012

chem
do this using the appropriate number of sig figs 320.44 − (3104.1/2.6) i got -880 as my answer and it said to check my sig figs. I thought it was all the numbers up to the ones place
August 18, 2012

Chem
Indicate which of the following are exact numbers. the mass of a stapler? i think its inexact because all staplers are different sizes. Is that correct? Also,the mass of a postage stamp. is that inexact? because they can also be diff. sizes?
August 17, 2012

sig figs
I am having trouble with my sig figs Many scientific data are reported at 25°C. What is this temperature in kelvins and in degrees Fahrenheit? I got 3.0e2 degrees kelvin since it will have to have two sig figs but it said it was wrong
August 15, 2012

english-grammar
I am writing an essay and am not sure If I should combine these two sentences with a semi colon or just leave them separate. Please help! (It may take...will be fruitful) I have found that nothing can be accomplished without hard work. It may take a large amount of persistence...
August 14, 2012

Chemistry
Awesome, thank you so much!!
August 12, 2012

Chemistry
Suggest a procedure that could be used to remove lead (II) ions from industrial waste water as a precipitate. Provide an equation and explain your choice.
August 12, 2012

math
Find the error. Sam is finding 9-6+2. Find his mistake and correct it. Steps: First solve the problem. Second, write a summary statement. Third, find Sam's mistake and explain in complete sentences.
July 30, 2012

Chemistry
Describe what hard water is and how a water softening unit works. Provide balanced chemical equations to show how sodium sulphate can remove these ions (Magnesium and Calcium). The first was no problem, but I am having trouble trying to get through the second part balancing ...
July 17, 2012

Math applied/pre-cal
(-8/5)^7/4*(-8/5)^1/4=64/25 Not sure how get this answer . Could please show me the steps.
July 11, 2012

Physics(Please help)
The two strings have the same tension and mass per unit length, but they differ in length by 0.54 cm. The waves on the shorter string propagate with a speed of 41.7 m/s, and the fundamental frequency of the shorter string is 227 Hz. Determine the beat frequency produced by the...
June 22, 2012

Physics(Please check)
A gas, while expanding under isobaric conditions, does 660 J of work. The pressure of the gas is 1.40 x 105 Pa, and its initial volume is 1.70 x 10-3 m3. What is the final volume of the gas? Would I multiply the two values? W = p*dV = p(Vf - Vi)--for isbaric p is constant. ...
June 22, 2012

Physics(Please respond)
A system does 210 J of work on its environment and gains 80.6 J of heat in the process. Find the change in the internal energy of (a) the system and (b) the environment. ÄU = Q - W Where ÄU is the change in the internal energy of the system, Q is the heat/energy ...
June 22, 2012

Physics(Please respond)
A system does 210 J of work on its environment and gains 80.6 J of heat in the process. Find the change in the internal energy of (a) the system and (b) the environment. Physics(Please respond) - Elena, Thursday, June 21, 2012 at 2:33am ÄU = Q - W Where ÄU is the ...
June 21, 2012

Physics(Please help)
A gas, while expanding under isobaric conditions, does 660 J of work. The pressure of the gas is 1.40 x 105 Pa, and its initial volume is 1.70 x 10-3 m3. What is the final volume of the gas? Would I multiply the two values?
June 21, 2012

Physics(Please help)
What is the smallest number of whole logs (ñ = 725 kg/m3, radius = 0.0800 m, length = 3.60 m) that can be used to build a raft that will carry four people, each of whom has a mass of 60.0 kg? I do not know how to start this.
June 21, 2012

Physics(Please check)
A paperweight, when weighed in air, has a weight of W = 6.95 N. When completely immersed in water, however, it has a weight of Win water = 4.26 N. Find the volume of the paperweight. Would I multiply the two values of weight and then by the density of water? 4.26=weightinair-...
June 21, 2012

Physics(Please help)
so I would do log of 4.83 then times 10?
June 21, 2012

Physics(Please help)
The intensity (in W/m2) of one sound is 4.83 times as great as the intensity of another sound. Relative to the quieter sound, what is the intensity level â of the louder sound? I am not sure how to start this. Thank you.
June 21, 2012

Physics(Please respond)
A satellite has a mass of kg orbits the Earth in a circular path with radius 1.0e^7m. What is the period of the satellite? I think I already posted this but I am still confused. My teacher said to use T= 2(pi)r^3/2 / sqrt GmE So I just plugged the numbers in T= 2(pi)(1.oe^7)^3...
June 20, 2012

Physics(Please check, thanks)
Looking through my textbook I found what it was that my teacher said to use. R= Vo^2 Sin 2Q / g So I guess I just have to plug in the numbers; Vo is 25^2 and Q is 40. Correct?
June 20, 2012

Physics(Please check, thanks)
Where did you get 625 and 4.9?
June 20, 2012

Physics(Please check, thanks)
A football player kicks a ball with a speed of 25m/s at an angle of 40 degrees relative to the horizontal. Ignore air resistance. 1) What is the ball's range? R= V0^2 sin Q / g Is this the correct equation to use?
June 20, 2012

Physics(Please, please respond)
so would it be between 90 and 180 or 180 and 270?
June 20, 2012

Physics(Please, please respond)
Vector A has a magnitude of 3.0 m and direction 1o3 degrees relative to the positive x-axis. Vector B has magnitude 5.0m and direction 215 relative to the positive x-axis. For the resultant I did Rx= 3 cos 103 + 5 cos 215 Ry=3 sin 103 + 5 sin 215 Then sqrt Rx^2 + Ry^2 and got ...
June 20, 2012

Physics(Please respond)
A source emits sound uniformly in all directions. There are no reflections of the sound. At a distance of 12 m from the source, the intensity of the sound is 1.7 × 10-3 W/m2. What is the total sound power P emitted by the source? Would I do 1.7e^-3 (12) ?
June 20, 2012

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