Wednesday
July 23, 2014

Posts by Emily


Total # Posts: 2,297

chemistry
Calculate the frequency of electromagnetic radiation emitted by the hydrogen atom in the electron transition from n = 7 to n = 6.

math
jasmine is helping her father plant trees to create a border around their back yard jasmine plants a treesevery 25 and her father plants a tree every 15 minutes if they started together how long before they would finsh planting a treee at the same time

math
slove the folowing eqaution negtive 23=x+35

geometry
the quadrilateral has a pweimeter of 60 meters. mp and no are congruent the length of mn is 10 meters and the length of no is 15 meters what is the length of po

analytical chemistry
blank is used to dissipate the error brought about by impurities. What is the other reason of using blank in Mohr method?

English
I have a few question on linking verbs: 1. I am fond of both kinds of comics. linking verb - fond? 2. Joseph Pulitzer was the first to publish color funnies. linking verb - was? 3. The sales of his newspaper were high. linking verb - sales 4. Sunday Funnies soon became part of...

physics
What is the approximate mass of air in a living room 6.0 m times 3.9 m times 2.7 m?

PHYSICS ---HELP!
Suppose there is a circular metal disk spinning at a constant angular velocity. Now imagine near to, but not in contact with the first disk, there is an identical metal disk spinning at the same angular velocity but in the opposite direction (ie. W1 = -w2) and the surfaces are...

Physics-- Please Help!!
Suppose there is a circular metal disk spinning at a constant angular velocity. Now imagine near to, but not in contact with the first disk, there is an identical metal disk spinning at the same angular velocity but in the opposite direction (ie. W1 = -w2) and the surfaces are...

chemistry
How much heat is released when a mixture containing 12.6 g CS2 and 12.6 g Cl2 reacts by the following equation? CS2(g) + 3 Cl2(g) → S2Cl2(g) + CCl4(g) ΔH° = −230. kJ

chemistry
How many grams of oxygen gas are required to produce 7.46 kJ of heat when hydrogen gas burns at constant pressure to produce gaseous water? 2 H2(g) + O2(g) → 2 H2O(g) ΔH = −484 kJ Liquid water has a heat of vaporization of 44.0 kJ per mole at 25°C.

chemistry
Calculate the heat released when 4.260 L Cl2 with a density of 2.46 g/L at 25°C reacts with an excess of sodium metal to form solid sodium chloride at 25°C.

chemistry
A 19.5-g sample of a metal was heated to 61.67°C. When the metal was placed into 26.5 g of water in a calorimeter, the temperature of the water increased from 25.00°C to 30.00°C. What is the specific heat of the metal?

Chemistry
Hydrogen cyanide is a highly poisonous, volatile liquid. It can be prepared by the following reaction. CH4(g) + NH3(g) → HCN(g) + 3 H2(g) What is the heat of reaction at constant pressure? Use the following thermochemical equations. N2(g) + 3 H2(g) → 2 NH3(g) Δ...

Math
An auditorium has 50 rows of seats. The first row has 20 seats, the second row has 21, the third row has 22 seats, and so on, each row having one more seat than the previous row. How many seats are there all together? a. write 2 different expressions for the total number of se...

trig
If a=8, the angle C=50 degrees and the angle A=35 degrees find the other angle B and the remaining b and c sides. Give your answer to at least 3 decimal places.

physics
Consider a hoola-hoop of radius R and it is spinning about its symmetry axis at a constant angular velocity. Now, I double its mass and halve its angular velocity. What is the new angular momentum in terms of the initial angular momentum?

physics
With acceleration of 2500 m/s2, how long will it take to rreach speed of light

physics
With acceleration of 2500 m/s2, how long will it take to rreach speed of light

English
Thank you so much. I think I get it!

English
Zoo keepers harvest bamboo for Pandas harvest = transitive? In China people eat the tender shoots as a vegetable. eat = transitive?

English
last two, I think I am getting it... Zoo keepers harvest bamboo for Pandas harvest = transitive? In China people eat the tender shoots as a vegetable. eat = intransitive?

English
Asian farmers live in bamboo houses? live = intransitive? Their sandals are made from bamboo strips. made = intransitive? Peoples sometimes sleep on bamboo mats. sleep = intransitive? In some countries, bamboo cages hold animals. hold = transitive?

English
Asian farmers live in bamboo houses? live = transitive? Their sandals are made from bamboo strips. made = transitive? Peoples sometimes sleep on bamboo mats. sleep = transitive? In some countries, bamboo cages hold animals. hold = transitive?

English
The Size might suprise you. suprise = transitive Some reach a height of 120 feet. reach = transitive The Japanese also make flutes from these stems. make - transitive

English
I am trying to figure out transitive or intransitive.... It is related to wheat, oats and barley. related = intransitive? The stems measure a foot in diameter. measures - transitive? Engineers strengthen concrete with it. Intransitive?

Chemistry
What is the temperature (in kelvins) at which 0.0260 mol occupies 1.00 L at 0.563 atm?

Biology
also located on the X chromosome is a gene that codes for deafness. This gene is recessive. a black female cat that is heterozygous for deafness (Dd) is crossed with a yellow cat that is not deaf What is the Punnet Square . and must use two letters on the x chromosome

algebra
what does x equal in this equation?1/2+7x/10=13/20

Biology
Thanks

Biology
Why do we perform aerobic respiration when we're resting and both aerobic and anaerobic respiration while we're running?

math
A low ha this paper sux ):

math
352$ for mae assurian and sally got $4.44 cents for 148 newspapers.

Applied statistics for business and economics
I apologize, 3 of the above answers are not correct. * a. 0.0498 * b. 0.0000 c. correct * d. 0.0038 e. correct f. correct

Applied statistics for business and economics
a. 0.9998 b. 0.0002 c. 0.0504 d. 0.0224 e. 3 cards f. 1.731877594 (rounded 1.7319)

Math
Thank you!

Math
For what values of k does the function f(x)=(k+1)x^2+2kx+k-1 have no zeros? One zero? Two zeros?

Physics
average acceleration in m/s squared

Physics
A sports car accelerates from rest to 89 km/h in 6.1s . What is its average acceleration in

Physics
A sports car accelerates from rest to 89 km/h in 6.1s . What is its average acceleration in

Physics
If you are driving 100km/h along a straight road and you look to the side for 1.9s , how far do you travel during this inattentive period?

physics
If you are driving 100 along a straight road and you look to the side for 1.9 , how far do you travel during this inattentive period?

Math
Determine the domain and range of f(x)=-sqrt(x+3) and the equation of the inverse.

Math
If f(x)=x^2-6x+14 and g(x)=-x^2-20x-k, determine the value of k so that there is exactly one point of intersection between the two parabolas.

Biology
What does the net movement of solutes/solvents during osmosis and diffusion mean?

chemistry
A coal burning plant that burns 4 metric tons of coal containing 2% sulfur (S) requires 1 metric ton of wet limestone (calcium carbonate) to remove 90% of the sulfur. The process prevents most of the sulfur from being emitted as sulfur dioxide to the air by producing calcium s...

chemistry
A coal burning plant that burns 4 metric tons of coal containing 2% sulfur (S) requires 1 metric ton of wet limestone (calcium carbonate) to remove 90% of the sulfur. The process prevents most of the sulfur from being emitted as sulfur dioxide to the air by producing calcium ...

physics
find the frictional force between an air hockey puck and the table, assume u air = 1.8 X 10^-5 kg/ms, the puck is 0.013 above the table, the puck has an area of 25 cm^2

chemistry
A coal burning plant that burns 4 metric tons of coal containing 2% sulfur (S) requires 1 metric ton of wet limestone (calcium carbonate) to remove 90% of the sulfur. The process prevents most of the sulfur from being emitted as sulfur dioxide to the air by producing calcium s...

chemistry
A coal burning plant that burns 4 metric tons of coal containing 2% sulfur (S) requires 1 metric ton of wet limestone (calcium carbonate) to remove 90% of the sulfur. The process prevents most of the sulfur from being emitted as sulfur dioxide to the air by producing calcium s...

precalc
find where f(x)<0 and f(x)>0 f(x)=xlnx-2x

Math
Given f(x)=7-2(x-1)^2, x>= 1, determine f inverse (5).

Math
Given f(x)=2x^2-1, determine the equation of the inverse.

Math
Given f(x)=7-2(x-1)^2, x>= 1, determine f inverse (5).

Chemistry
what is the wavelength of the photon emitted when an electron drops from a 4p orbital to a 2p orbital in a hydrogen atom

Biology
A cell has a salt concentration of 0.2 %. If it is placed into a solution with a salt concentration of 0.1 %. a) What change will occur to the salt concentration inside the cell? b)What change will occur to the water concentration inside the cell? c)What condition will eventua...

Economics
True or false: The US must remove tariffs and quotas to open trade with foreign countries. Consider the following issues: The definition of tariffs and quotas. The strength of the dollar on domestic and global economies. Benefits from tariffs or quotas, including examples. Los...

Chemistry
Given a 2.5 kg solution of phosphoric acid and water (56 % phophoric acid, by mass), calculate the number of moles of phosphoric acid.

Chem
I got 100125 is that correct?

Chem
The specific heat capacity of aluminum is .89 J/y degrees C. How much heat is required to change the temp of 1500g aluminum pan from 25 degrees C to 100 degrees C?

Chem
The specific heat capacity of aluminum is .89 J/y degrees C. How much heat is required to change the temp of 1500g aluminum pan from 25 degrees C to 100 degrees C?

calculus
Find the equation of a cubic function that gives you the surface area of the cans given a set volume. The set volume is 300ml

History
yes

Photography
What's the difference between the setting of the enlarger height and focusing the image? Aren't both of the dealing with the light that shines onto the baseboard?

Math
What does it mean by: Show that the "value of 3x^2-6x+5" cannot be less than 1. ?

Physics
Oh! thanks! I understand it now :D

Physics
So it's 20 x 0.8=16?

Physics
A certain force made a 5.0 kg mass accelerate at 4.0 m/s^2. This same force made another object accelerate at only 0.8 m/s^2. Find the mass of the second object. I have no idea how to do this. Do i use m=1/a? What do i do?

Physics- Newton's 1st and 2nd Law
Thank you so much for the help!!

Physics- Newton's 1st and 2nd Law
Please help me :( Briefly explain the following scenario's using Newton's first law. a) Trevor wants to tow Kevin's car with his truck. He attached a small tow rope between the vehicles and leaves the rope slack (loose). Trevor quickly accelerates forwards making t...

Math
What are the vertical and horizontal stretch/compressions for the functions h(x)=1/(5x) and k(x)=|0.4x| ?

physics
A car drives straight off the edge of a cliff that is 56 m high. The police at the scene of the accident note that the point of impact is 129 m from the base of the cliff. How fast was the car traveling when it went over the cliff?

Physics
I understand the mass should be divided by the density for the required volume. I dont think that I am using the correct numbers. I came up with a volume of 172800 or 1.7 x 10^5 but the answer is incorrect. Can you please help?!! I did (1000V)(10)(500) = 1.7x 10^5

Physics
where would I use the 9.8m/s^2? And the density is which number?

Physics
To store the energy produced in 1.5 hour by a 160 MW (160 10^6 W) electric-power plant, how many cubic meters of water will have to be pumped from the lower to the upper reservoir? Assume the upper reservoir is 500 m above the lower and we can neglect the small change in depth...

Math
A 5 m stepladder propped against a classroom wall forms an angle of 30 degree with the wall. Exactly how far is the top of the ladder from the floor? Express your answer in radical form. What assumption did you make?

math
find a function y=ax^2+bx+c whose graph has an x-intercept of 1, a y-intercept of -2, and a tangent line with slope -1 at the y-intercept.

Math
Given any right triangle with an acute angle theta, a) Explain why csc theta is always greater than or equal to 1 b) Explain why cos theta is always less than or equal to 1

hist
who were the pilgrims and what did they believe?

algebra
A brick border that is x feet wide is built around a rectangular patio. The patio is 6 feet wide and 8 feet long. The combined area of the patio and the brick border is 120 square feet. What is the width of the brick border?

algebra
If the area of a square is 9x2-12xy+4y2, what is the perimeter of the square in terms of x and y. *its 9x squared and 4y squared i have several problems like this on my homework if you show me how to do this one im sure i could figure out the rest

algebra
Elliot is 5 times as old as Sid. Ten years from now, Elliot will be at least 3 times as old as Sid will be then. At least how old is each person now?

Physics
You are driving to the grocery store at 14.8 m/s. You are 140.0 m from an intersection when the traffic light turns red. Assume that your reaction time is 0.440 s and that your car brakes with constant acceleration. You are 133 m from the intersection when you begin to apply t...

3rd grade
200

Physics
i do not think that is correct because i am getting the incorrect answer.

Physics
You are driving to the grocery store at 14.8 m/s. You are 140.0 m from an intersection when the traffic light turns red. Assume that your reaction time is 0.440 s and that your car brakes with constant acceleration. You are 133 m from the intersection when you begin to apply ...

Physics
You are driving to the grocery store at 14.8 m/s. You are 140.0 m from an intersection when the traffic light turns red. Assume that your reaction time is 0.440 s and that your car brakes with constant acceleration. You are 133 m from the intersection when you begin to apply t...

Physics
A speedboat starts from rest and accelerates at +2.07 m/s2 for 7.00 s. At the end of this time, the boat continues for an additional 6.00 s with an acceleration of +0.523 m/s2. Following this, the boat accelerates at -1.55 m/s2 for 8.00 s. What is the velocity of the boat at t...

Physics
nope :(

Physics
kk got that. did you get number 18?

Physics
okay ! and which q'n did u get 255 m for?

Physics
k i got this one.. find the t it takes for each runner using t=d/v....then subtract the times, and you have the answer !

Physics
A speedboat starts from rest and accelerates at +2.07 m/s2 for 7.00 s. At the end of this time, the boat continues for an additional 6.00 s with an acceleration of +0.523 m/s2. Following this, the boat accelerates at -1.55 m/s2 for 8.00 s. What is the velocity of the boat at t...

Physics
You are driving to the grocery store at 14.8 m/s. You are 140.0 m from an intersection when the traffic light turns red. Assume that your reaction time is 0.440 s and that your car brakes with constant acceleration. How far are you from the intersection when you begin to apply...

Physics
alrighttyy. did u get number 13, 14 or 18?

Physics
okay thanks ! was your velocity really small and negative then?

Physics
okay but what does 'u' refer to? Also, for question #7, how did you figure out the total velocity for the entire trip?

Physics
oh okay i got that ! thanks. for the second part..how long it takes to reach the bottom.. do u use t = d/v?

Physics
yes. but how did you get it because i have different numbers

Physics
I have this same question.. got it wrong

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