Tuesday
October 21, 2014

Posts by Hannah


Total # Posts: 2,890

Physics
A person pushes a 23.4-kg shopping cart at a constant velocity for a distance of 31.1 m on a flat horizontal surface. She pushes in a direction 34.8 ° below the horizontal. A 38.5-N frictional force opposes the motion of the cart. (a) What is the magnitude of the force ...
September 21, 2011

Math(Please help, very confused!)
A piece of copper contains 3.6 x 10^8 atoms. What is the volume of the sample in units of liters? i have no idea how to start this. Please help thank you!!!
September 20, 2011

Calculus
2sin(2theta) + sqrt(3) = 0 interval (0,2pi) How do I solve this? I thought about maybe subtracting the sqrt(3) from both sides, so that i would have 2sin(2theta) = -sqrt(3) Then maybe dividing by two? sin(2theta) = -sqrt(3)/2 Am I doing anything right here? It's been a ...
September 20, 2011

chemistry
If you dissolve 29.25 g of sodium chloride in 250 g of H2O. What would be the freezing point? Kfp- -1.86 degrees C/molal I know the formula is K times molality. I am taking -1.86(2.00) and getting -3.72 degrees Celsius, when the answer is -7.44 degrees. What am I doing wrong?
September 19, 2011

Science
Unscramble acnsrl spgei
September 19, 2011

Math(Please help!!!)
A piece of copper contains 3.6 x 10^8 atoms. What is the volume of the sample in units of liters? I know that first you have to get atoms to cancel out but them I do not know what to do!
September 18, 2011

physics
A 0.07 kg toy is made up of a spring of constant 375 N/m. When you place the toy on the floor,!@#$%^& the spring 7 cm and release it, the toy jumps upwards. What is in Joules the mechanical energy of the toy when sitting on the floor with a!@#$%^&ed spring? Use 10 m/s2 for g.
September 16, 2011

physics
A 0.05 kg toy is made up of a spring of constant 466 N/m. When you place the toy on the floor,!@#$%^& the spring 5 cm and release it, the toy jumps upwards. What is in Joules the spring potential energy stored in the toy when sitting on the floor with a!@#$%^&ed spring? Use 10...
September 16, 2011

physics
A 0.05 kg toy is made up of a spring of constant 466 N/m. When you place the toy on the floor,!@#$%^& the spring 5 cm and release it, the toy jumps upwards. What is in Joules the spring potential energy stored in the toy when sitting on the floor with a!@#$%^&ed spring? Use 10...
September 16, 2011

physics
It takes 9.10 J of work to stretch a spring 5.10 cm from its unstressed length. What is the spring constant k in N/m?
September 16, 2011

physics
It takes 5.50 J of work to stretch a spring 5.90 cm from its unstressed length. What is the spring constant k in N/m?
September 16, 2011

physics
Amy threw a ball of mass m=0.79 kg horizontally with an initial velocity v=33.4 m/s from a height h=1.9 m. What is the kinetic energy of the ball just before it touches the ground? Express your answer in Joules and use 10 m/s2 for g.
September 16, 2011

physics
A 0.730 kg particle has a speed of 3.00 m/s at point A and kinetic energy of 7.40 J at B. What is its speed at B? Answer in units of m/s.
September 16, 2011

physics
A 4.62 x 10-5 kg raindrop falls vertically at constant speed under the influence of gravity and air resistance. After the drop has fallen 83.7 m, what is the work done by gravity? Answer in units of milliJoule (a thousandth of a Joule) and use 9.8 m/s2 for g
September 16, 2011

Math(Please help)
A piece of copper contains 3.6 x 10^8 atoms. What is the volume of the sample in units of liters? I know that first you have to get atoms to cancel out but them I do not know what to do.
September 13, 2011

Math(Please help! Thank you!!)
A piece of copper contains 3.6 x 10^8 atoms. What is the volume of the sample in units of liters? I know that first you have to get atoms to cancel out but them I do not know what to do.
September 13, 2011

scientific method and measurement 8th Hons science
You see i already know its not replicable or such 13 letters long and it ends with an N.
September 12, 2011

scientific method and measurement 8th Hons science
Can Anyone Please Help Me?
September 12, 2011

scientific method and measurement 8th Hons science
what allows results to be verified to maintain credibility?
September 12, 2011

Math(Please help)
The radius of a niobium atom is 131 pm. How many niobium atoms would have to be laid side by side to span a distance of 1.4 mm?? I know that 10^9 is pm or is it -9??
September 11, 2011

Math
4.47 x 10^1 g How wouldI convert this to nanmograms? would I use 1mg / 10^-9 g? I do not understand how to do this
September 11, 2011

math
8 decimeters
September 11, 2011

Math(Please check! Thank you!!)
metric system conversions 1)3.68kg = ? g (3.68 kg) (10^-3 / 1kg) = 3.68 x 10^-2 g 2) 568cm = ? m (568cm) (1 m /100cm) = 5.68 m Are these correct?
September 11, 2011

PHYSICS
A student of weight 830 N was sent to another planet called Nerdland. If Nerdland has a mass that is three times the mass of the earth and a radius that is half the radius of the earth, what would be the mass in kg of the student when on Nerdland?
September 8, 2011

Calculus
find f(3) and f'(3), assuming that the tangent line to y=f(x) at a=3 has the equation y=5x+2.
September 7, 2011

Physics
At the heighest point on earth, the distance to the center of the earth is approximately equal to 1.0014 times the radius of the earth. What would be in N/kg the magnitude of the gravitational field (g) due to the earth at that position? Assume 9.8 N/kg for g at the surface of...
September 6, 2011

pre cal
A movie theater seats 400 people. For any particular show, the amount of money the theater makes is a function m(n) of the number of people, n, in attendance. If a ticket costs 2 dollars, find the domain and range of this function
September 4, 2011

Math
An auditorium has 1600 seats. At a ticket price of $6, the owners can sell 1200 tickets. For each 25 cent increase in price the tickets sold reduces by 25. What price should the owners set to maximize the income?
August 29, 2011

Math
What is another name for odd numbers?
August 29, 2011

Biology(Please help)
Why are cyanobacteria not bacteria? Is it because they can be nitrogen fixers?
August 28, 2011

Math
The expression 9a + 6s is theh cost for a adults and s students to see a musical performance.
August 26, 2011

physics
A body moving with uniform acceleration has a velocity of 9.9 cm/s when its x coordinate is 1.28 cm. If its x coordinate 1.3 s later is -9.1 cm, what is the magnitude of its acceleration? Answer in units of cm/s2.
August 25, 2011

physics
An electron has an initial speed of 178000 m/s. If it undergoes an acceleration of 4.8 x 1014 m/s2, how far has it traveled before reaching a speed of 789000 m/s? Answer in units of m.
August 24, 2011

physics
An electron has an initial speed of 178000 m/s. If it undergoes an acceleration of 4.8 x 1014 m/s2, how far has it traveled before reaching a speed of 789000 m/s? Answer in units of m.
August 24, 2011

Speech
I have to give a speech soon about my different " sides" of my life. Like my school life and what I do at school compared to how I act as a sibling etc. But I'm stumped on what my visual should be. My teacher wants originality no power point or posters with just ...
August 22, 2011

Pre-Algebra
5 and 17/20 - 3 and 1/4
August 18, 2011

Pre-Algebra
5 and 17/20 - 3 and 1/4
August 18, 2011

math
Suppose f is a 1-1 function with domain A and range B. What is the range of f^-1? Would it be A?
August 14, 2011

introductory technology
A boat is tied to a stake on a fast flowing river. What energy does the boat gain when the rope is cut.
August 10, 2011

reading
the setting where does the story take place, time period (present, future etc.), the main character(s), the plot-what happens to the main character
August 8, 2011

reading
I need help on writing a book report on anastasia absolutely
August 8, 2011

Statistics(Please help)
t-test for independent means: n=8 t=-1.33 df= 8 C.V. = plus or minus 2.306 My question is how do you get 2.306 for the cv??? Why wouldnt the cv be 2.31?
August 2, 2011

statistics
t-test for independent means: n=8 t=-1.33 df= 8 C.V. = plus or minus 2.306 My question is how do you get 2.306 for the cv???
August 2, 2011

Chemisty
How would you classify a solution of NaCl at 35.9 g/100 g of water at 20° C?
August 1, 2011

Chemisty
that's all the information i have, this is my only worksheet on the subject so i'm honestly only looking for an answer
August 1, 2011

Chemisty
How much KNO3 will you have to add to 100 g of water at 40° C to make a saturated solution?
August 1, 2011

Chemisty
In terms of saturation, how would you classify a KBr solution with a concentration of 78 g/100 g of water at 47°C?
August 1, 2011

Chemisty
In terms of saturation, how would you classify a KBr solution with a concentration of 78 g/100 g of water at 47°C?
August 1, 2011

Prob ans stat
Let x be a random variable that represents the length of time it takes a student to complete a take-home exam in Dr. Larson's psychology class. After interviewing many students, it was found that x has an approximately normal distribution with mean of 5.2 hours and ...
July 29, 2011

Statistics(Please check)
calculate the probability of the following: A four, three, or spade from a single draw from a 52 card deck. there are 4 4's so 4/52, 4 3's so 4/52 and then 13/52 spades so 21/52 but and one 4 and one 3 are from spades so minus 2 = 19/52 Is this correct?
July 23, 2011

Statistics(Ugent Please help!!)
Nevermind I figured it out
July 23, 2011

Statistics(Ugent Please help!!)
Assume that 100 subjects received one of four treatment combinations and produced the data reported below. Conduct a two-factor ANOVA and complete an ANOVA table reporting the relevant SS, df, MS, F's. N=100 n=25 the table shows A1 and A2 at the top and B1 and B2 on the ...
July 23, 2011

Statistics(Please help)
Assume that 100 subjects received one of four treatment combinations and produced the data reported below. Conduct a two-factor ANOVA and complete an ANOVA table reporting the relevant SS, df, MS, F's. N=100 n=25 the table shows A1 and A2 at the top and B1 and B2 on the ...
July 23, 2011

chemistry
A sample of metallic element X, weighing 4.315 g, combines with 0.4810 L of Cl2 gas (at normal pressure and 20.0¢ªC) to form the metal chloride with the formula XCl. If the density of Cl2 gas under these conditions is 2.948 g/L, what is the mass of the chlorine? The ...
July 22, 2011

chemistry
A sample of metallic element X, weighing 4.315 g, combines with 0.4810 L of Cl2 gas (at normal pressure and 20.0¢ªC) to form the metal chloride with the formula XCl. If the density of Cl2 gas under these conditions is 2.948 g/L, what is the mass of the chlorine? The ...
July 22, 2011

Statistics(Please help)
thank you
July 21, 2011

Statistics(Please help)
the problem asks to complete an ANOVA table and report the relevant SS, df, MS, and F values, and find the critical value for the F-values. I found my F values: they were 3 and 16. I do not understand how to find the critical value.
July 21, 2011

Math/Algebra
The length of Karen's living room is 2ft longer than the width. The perimeter is 80ft. Find the length and the width. Can someone please explain to me how you find the answers? Thanks a ton!
July 17, 2011

chemistry
After you preform your experiment, you determine that the Kf value for naphthalene is 6.9 . You are using 10g of naphthalene and added 1.0 g of your unknown. The the freezing point of the solvent decreased by 4.42 when the unknown was added. Knowing this information, determine...
July 17, 2011

chemistry
Strontium has density of 2.64 and crystallizes with the face-centered cubic unit cell. Find the radius of the strontium atom
July 10, 2011

chemistry
How much heat (in ) is evolved in converting 1.00 of steam at 150.0 to ice at -55.0? The heat capacity of steam is 2.01 and of ice is 2.09 .
July 10, 2011

chemistry
How much heat (in ) is evolved in converting 1.00 of steam at 150.0 to ice at -55.0? The heat capacity of steam is 2.01 and of ice is 2.09 .
July 10, 2011

chemistry
Benzene has a heat of vaporization of 30.72kJ/mol and a normal boiling point of 80.1 C. At what temperature does benzene boil when the external pressure is 490 ? I think I have the equation setup, but I can't figure out how to solve for T2..please help
July 10, 2011

statistics
thank you!!!
July 6, 2011

statistics
calculate the correlation for data set A. Data Set A: xi = 65, 55, 50, 45, 35 yi= 44, 52, 68, 20, 36 I know how to find the mean, variance, standard deviation, and z-score. The part I am having trouble finding is the ZxiZyi. In the chart that I have to fill in it says Zxi in ...
July 6, 2011

economics
What is the role of economic theory in the way economies are run today? I need some concrete examples.
July 6, 2011

Statistics(Please help)
I have a chart that has 4 columns across the top and 33 going down. The colunms on the top read: predicted number, selected number, (col 1 - col2)^2, and the mean of x. Their are 32 predicted numbers and 33 selected numbers. I need to fill in the column that says the mean of x...
July 2, 2011

Statistics(Urgent!Please help)
I have a chart that has 4 columns across the top and 33 going down. The colunms on the top read: predicted number, selected number, (col 1 - col2)^2, and the mean of x. Their are 32 predicted numbers and 33 selected numbers. I need to fill in the column that says the mean of ...
July 1, 2011

Statistics
I have a chart that has 4 columns across the top and 33 going down. The colunms on the top read: predicted number, selected number, (col 1 - col2)^2, and the mean of x. Their are 32 predicted numbers and 33 selected numbers. I need to fill in the column that says the mean of ...
June 30, 2011

Statistics
I have a chart that has 4 columns across the top and 33 going down. The colunms on the top read: predicted number, selected number, (col 1 - col2)^2, and the mean of x. Their are 32 predicted numbers and 33 selected numbers. I need to fill in the column that says the mean of x...
June 30, 2011

Chemistry
yep its right
June 5, 2011

maths
5x10^2 divide by 7x10^4 what is the answer in standard form
June 5, 2011

maths
expand 5(3w^2+4)
June 5, 2011

Calculus
Find the definite integral that represents the arc length of the curve y=sqrt(x) over the interval [0, 3]
May 26, 2011

Calculus
Find the volume of the solid formed by revolving the region bounded by y=x^3, x=2 and y=1 about the y-axis. Please help =(
May 26, 2011

Spanish
How do you say she was looking at the tv in Spanish. I know this is in the imperfect progressive but ver ( to look) is irregular in the imperfect . Does that matter? Would it be esta viendo a la tele?
May 25, 2011

chemistry
Calculate the E° for each of the following reaction. Decide whether each is product-favored in the direction written 2 Cl-(aq) + Cu2+(aq) --> Cu(s) + Cl2(g) i got -1.020 but its wrong and i do not know why.
May 12, 2011

chemistry
From the indicated voltages for the voltaic cell pictured, determine the standard electrode potential, E°M3+/M, if the metal, M, is each of the following. description on the image: in the left beaker there is one Cr3+ and one Cr2+ on the right beaker there is 'M'3...
May 12, 2011

Probability NEED HELP
1. When two fair dice are tossed, what is the probability of a sum of 4 or a sum of 8? 2. When two fair dice are tossed, what is the probability of doubles or a sum over 9? 3. Evaluate 1025! / 1022! Please help
May 11, 2011

Probability
1. When two fair dice are tossed, what is the probability of a sum of 4 or a sum of 8? 2. When two fair dice are tossed, what is the probability of doubles or a sum over 9? 3. Evaluate 1025! / 1022! Please help
May 11, 2011

Chem
2 Ag+(aq) + Fe(s) --> 2 Ag(s) + Fe2+(aq) In which directions do the cations and anions migrate through the solution? cations toward the silver cathode or toward the iron cathode thanks
May 11, 2011

Chemistry
i have a follow up question: In which directions do the cations and anions migrate through the solution? toward the silver cathode ? or toward the iron cathode ? so do the anions(Fe)migrate to the silver? and cations toward the iron? there is a diagram that goes along with ...
May 10, 2011

Chemistry
oh ok i see! thanks!
May 10, 2011

Chemistry
Im having trouble on a question Im not sure what it is they are asking for. A voltaic cell similar to that shown in Figure 20.5 is constructed. One electrode compartment consists of a silver strip placed in a solution of AgNO3, and the other has a iron strip placed in a ...
May 10, 2011

Grammar
Does this sentence make sense, if not how do you write it correctly Never give up to your dreams? Thank you!
May 7, 2011

Grammar
Is the capital word used right in this sentence, if not how can i use it with the same meaning of the sentence His song was SKEPTICAL because it was so good Thank you!
May 7, 2011

CHEM
An atom at the face of a unit cell is shared by how many unit cells? 1 2 4 6 8
May 4, 2011

Math
o ok thank you.
May 1, 2011

Math
1) evaluate: integral of (3x^2 + 5x - 1 + 3/x) dx x^3/3 + x^2/5 - x Is this correct? 2) evaluate: integral of (5e^7x + srqtx) dx I am not sure with this. Could you please explain. Thank you for you help!
May 1, 2011

Math
for number 2 how did you get 2e^2x?
May 1, 2011

Math
1) evaluate integral of xe^3x dx 2) evaluate integral form 1 to 0 of 4e^2x dx I just need help finding the anitderivative. Would it be 2e^2x?
May 1, 2011

math
thank you
May 1, 2011

math
Deifferentiate: y=e^-3x+2 would the answer be -3e^-3x+2 or 3e^-3x+2
May 1, 2011

Math(Please help. Thank you)
thank you
May 1, 2011

Math(Please help. Thank you)
1)evaluate: integral of x ln 4x dx 1/2 x^2 + 2x^2 Is this correct? 6) evaluate the integral from 3 to 1 of x^3 - 3x +1 1/4x^4 + 3/2 x^2 Is this the correct antiderivative?
May 1, 2011

Math(Please help. Thank you)
Is number 3 considered a related rates problem?
May 1, 2011

Math(Please help. Thank you)
Are the rest that I did do correct?
May 1, 2011

Math(Please help. Thank you)
solve the following for x. 1)e^x^2-x=e^2 x^2-x = 2 I am not sure what to do now 2) e^-5x * e^4 = e -5x + 4 = 1 x= 3/5 3) Suppose that the price p (in dollars) and the demand in x(thousands) of a commodity satisfy the demand equation 6p + x + xp =94. How fast is the demand ...
May 1, 2011

Math(Please check. Thank You)
Thank you!!
April 30, 2011

Math(Please check. Thank You)
1) solve:e^x(x^2-4)=0 e^x=0 and then (x+2)(x-2) so x=2, -2 2) differentiate: y=ln(6x^2 - 3x + 1) 1/(6x^2 - 3x + 1) * 12x-3 3) differentiate: y=e^-3x+2 -3 * e^-3x+2 4) evaluate: 2^4-x=8 2^4-x = 2^3 4-x = 3 -x=-1 so x=1 5) differentiate: x^3 + y^3 -6 =0 3x^2 + 3y^2 6) A ...
April 30, 2011

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