Sunday
April 20, 2014

Posts by H


Total # Posts: 134

chemistry
The density of 19.0% by mass of nitric acid, HNO3 is 1.11 g cm-3. Calculate the volume (dm3) of acid needed to prepare 2.00 dm3 of 3.00 mol dm-3 HNO3 solution. (FW HNO3 = 63 g/mol)

english
What is the tone in "a thankless experience

calculus
A closed cardboard box is made with a square top and bottom, and a square horizontal shelf inside that divides the interior in half. A total of 12 square meters of cardboard is used to make the top, sides, bottom, and shelf of the box. What should the dimensions of the box be ...

calculus
A dog kennel with four pens is to be constructed. The pens will be surrounded by rectangular fence that costs $23 per meter. The rectangle is partioned into four pens of equal size with three partitions made of fence that costs $12 per meter. Each pen measures x meters wide by...

Math
0 is the intercept because the line passes through the axis at X=0 or y=0

Calculus
27 ft of wire is to be used to form an isosceles right triangle and a circle. Determine how much of the wire should be used for the circle if the total area enclosed is to be a maximum? I can only find the minimum because the parabola is opening upward

Chemistry
Electron exhibiting a particle wavelength of 7.18 x 10-9 are emitted from hydrogen atoms after interaction with high energy photons. Assuming that the electrons in the hydrogen atom were in their ground state prior to interaction, determine the wavelength of the photon which g...

microeconomics
Question 20 of 20 5.0 Points If the government attempts to control pollution with a command-and-control policy: A. the government will control the firm's entire production process. B. the government will force the firm to use particular pollution-control technologies. C. t...

physics
a large bus and a van, both moving with a velocity of magnitude v, have a head-on-collision and both the vehicles stop after the collision. if the time of the collision is 1 sec then, a) which vehicle experiences smaller force of impact? b) which vehicle experiences the smalle...

Physics
Suppose that we repeat the experiment shown in the video, but we replace one of the cylinders with a cylinder that has twice the radius (and use larger containers of water). If the height of the original cylinder is \rm h, how deeply must we submerge the new cylinder to get th...

biology
,

physics
A key falls from a bridge that is 45 m above the water. The key falls straight down and lands in a model boat traveling at a constant velocity of 3.5 m/s. Calculate the distance the boat was from the point of impact when the key was released. Answer d= 10.6 m

physics
A ball is dropped from the top of a building. The balls fall 3 times farther during its last second of freefall than it did during its third second of freefall. The ball fell 4.9 meters during its first second, how tall is the building and how much time is the ball in the air?...

math algebra
.075*10000 = .08x + .06(10000-x) x = 7500 ------ .075*10000 = .08*7500 + .06(10000-7500) .075*10000 = 600 + .06(2500) .075*10000 = 600 + 150 .075*10000 = 750 750$

geometry
A swimming pool is 3 ft deep in the shallow end the bottom of the pool has a steady downward drop of 12 degrees if the pool is 50 feet long how deep is the deepest end?

Physics
.05

Physics
.05

Calc
thanks for the first part. i wanted something that was more step-by-step for the second one.

Calc
Evaluate the integral using any method: (Integral)sec^3x/tanx dx I started it out and got secx(1tan^2x)/tanx. I know I just have to continue simplifying and finding the integral, but I'm stuck on the next couple of steps. Also, I have another question witht he same directi...

Chemistry
just get the molar mass and use multiplication by one, meaning it would be mol/1 x grams(from molar mass)/moles(1)of the compound.

Chemistry
What mass of Ca(OH) 2 is required to make 1.5 l of a 4.0% (w/v) solution of Ca(OH)2 in water?

Calculus
Find the volume of the solid generated by revolving the region bounded by the line y=5x+6 and the parabola y=x^2 about the following lines: a) the line x=6 b) the line x=-1 c)the x axis d) the line y=36 Thanks!

Chemistry
A 50.0 mL graduated cylinder has a mass of 67.6 g. When it is filled with an unknown liquid to the 38.8 mL mark, the cylinder and liquid combined have a mass of 119.4 g. Calculate the density of the liquid in g/cm3. (1 mL = 1 cm3.)

Chemistry
the steps are right but its not al its zn.

calculus
Integral from pi/6 to pi/4 of 2sin(2x)cos(2x)dx=

physics
A wire 453 m long is in a 0.2 T magnetic field. A 2.56 N force acts on the wire. What current is in the wire? Answer in units of mA

algebra
solve by using the square root method: (5y+4)^2+100=0

6th grade math
23. 5.87 25. 9.035 27. 8.669 29. .143

calculus
The value of c for which f(x) = x + c/x has a local minimum at x= 3 is (a) -9 (b) - 6 (c) -3 (d) 6 (e) 9

English
22 is B. do you know 7) I wonder if my daydream of my neighbor's house being raided has worked its way across the street. ?

English
16 is the american. do you know what 11)I didn't care much for the poems she wrote. ?

6th grade math
2:1 or 2/1

chemistry
what is the volume in liters of 3.0 moles CH4, at 26C and 1.48atm?

physics
hg

physics
a cat walking at 0.25 m/s sees a mouse and accelerates uniformly at 0.40 m/s (squared) for 3.0 s. what is the cat's displacement during this time?

Physics
A car starting from rest, accelerates at 5.0 m/s^2 fpr an unknown time interval. If the car travels 250 m in the acceleration period, what is the time interval?

physics
An object accelerates from 5.0 m/s to 100m/s. If the object traveled 250 m during this time, what was the acceleration?

Science
Equal Masses of phosphorus and chlorine react according to the follow equation. 2P+3Cl2=2PCl3 Which reagent is in excess and what percentage of it will remain at the end of the reaction

principle of managemen
jkyfgttctt

physics 1
197.568

engineering
isnt the area of a circle Pi*R^2?

half life
look at the intro to nuclear physics (2500U) tutorial notes (tut 6 i think)

math
1+4+s=

math
1+4+s=

Pre -calculus
An observer 2 km from the launching pad observes a vertically ascending missile at an angle of elevation of 21 degrees. 5 seconds later the nagle has increased to 35 degrees. What was its average speed during this interval? If it keeps going vertically at the same average spee...

physics
-272.97

Math 12
trig question 2sin^2x+sinx-6=0 how to solve for x when the restriction is x is greater than or equal to zero but less than 2pi

CHEMISTRY (WEBWORK)
how about parts a and b?

CHEMISTRY (WEBWORK)
problem 7 part A: iii, iv. part b: i. didn't get problem 8 yet.

CHEMISTRY (WEBWORK)
i got it right.

CHEMISTRY (WEBWORK)
number 9 part A is : v, vi

College Physics
A 8.2 gram lead bullet that was stopped in a doorframe apparently melted completely on impact. Assuming the bullet was fired at room temp., what is the minimum muzzle velocity of the gun?

Horizon
What would the final volume of water be if 80.0 kJ were added to a 100.0 mL sample at 100.0 degrees Celsius?

Accounting
I know this is late, but its mostly to those that will get this problem at some point. You are right about the journals. To find the Rent expense, you need to add ALL payments (11,000+11,600+12,200+12,800+...+23,000) then divide by 21 (the term of the lease) To find Cash, mult...

math
A rectangular field 250 m long by 110 m wide. How much shorter is it to walk diagonally across the field than around the sides?

calc
A train travels from city A to city B. The cities are 600 miles apart. The distance from city A at t hours after the train leaves A is given by d(t) = 50t + t^2. What is the average velocity of the train in miles per hour during the trip from A to B?

math
I am working on a problem where I am to graph the equation and identify the y intercept the equation is y+x=-9 On the graph, I plotted (0,-9) and (-9,0); I identified the y intercept as (0,-9) Is this correct?

algebra
My answer to the question below is >=22.5 is it correct 0.6x+4<=1.0x-5

Child Psychology
They are authoritarian answer c

math
I am lost, and I bet it is simple, but I have been working with many problems and I keep coming back to this and I grow increasingly confused. How do I begin to solve this problem? In 1993 the life expectancy of males in a certain country was 71.7 years. In 1997 it was 75.2 y...

Algebra
I am lost, and I bet it is simple, but I have been working with many problems and I keep coming back to this and I grow increasingly confused. How do I begin to solve this problem? In 1993 the life expectancy of males in a certain country was 71.7 years. In 1997 it was 75.2 y...

Math
I am lost, and I bet it is simple, but I have been working with many problems and I keep coming back to this and I grow increasingly confused. How do I begin to solve this problem? In 1993 the life expectancy of males in a certain country was 71.7 years. In 1997 it was 75.2 ye...

MATH/ALGEBRA PLEASE
Okay, I think I have arrived at all the answer to the questions thrown my way. However, how do I explain what is happening “graphically”, where the services are charging same rate? : Your company must use a transportation service to shuttle their corporate partners f...

Help;is this correct?
Graphically, where the services are charging the same rate, the graphs will intersect. A solution of a system of equations in two variables is an ordered pair that makes both equations true.

Help;is this correct?
Graphically, where the services are charging the same rate, the graphs will intersect. A solution of a system of equations in two variables is an ordered pair that makes both equations true.

Algebra help
Okay, I think I have arrived at all the answer to the questions thrown my way. However, how do I explain what is happening “graphically”, where the services are charging same rate? : Your company must use a transportation service to shuttle their corporate partners f...

Algebra
Okay, I think I have arrived at all the answer to the questions thrown my way. However, how do I explain what is happening “graphically”, where the services are charging same rate?

Math
Here is the question: The mortgage department of the company is selling two model homes that are located on the same block. The square footage, as well as the type of model, determines the cost of these homes. e) The second home has 1000 square feet less than twice the square ...

MATH
Thanks

MATH/amendment
I added a few more sentences, does this sound okay, or should I exclude it? The interval notion is a way to express solutions of an inequality. Points a and b are the endpoints of the interval; we can include parentheses and brackets to express the interval notation; (a,b) sho...

MATH
Give a response of at least 50 words to the following: Describe the graph of the interval [-4, 3). • Explain how this differs from the graph of the interval [-4, 3]. From the question above, does the answer below sound right? The interval notion is a way to express soluti...

algebra
.45n

algebra
It would look like this...9(23-4y)+7y=4 Then you simplify 9*23=207 9*-4y=-36y so you now have 207-36y+4y Combine like terms -36y+4y=-32 -32y=4 Finally you divide the end reslut is y=-8

physics
If you jump from rest from a height of 2.0 m above ground, what is your speed (magnitude only), right before you hit the ground? Give your answer numerically in m/s using decimal notation (omit the units). Use the acceleration due to gravity as g=9.8 m/s2 i got my answer as 6...

Math
if amy had 800 apella and their two firends hoe much would their friend will get?

english
“We can't all be heroes, because somebody has to sit on the curb and applaud when they go by.” what does this quote mean?

chemistry
only br and h are produced, br in the anode and h in the cathode

CHEM..URGENT!
What is produced at each electrode in the electrolysis of NaBr(aq) and AgF(aq)?

chemistry
Which substances in each of the following pairs would have the greater entropy? Explain. (a) at 75°C and 1 atm: 1 mol H2O(l) or 1 mol H2O(g) (b) at 5°C and 1 atm: 50.0 g Fe(s) or 0.80 mol Fe(s) (c) 1 mol Br2(l,1 atm, 8°C) or 1 mol Br2(s, 1 atm, -8°C) (d) 0.312 ...

Algebra
Sorry i typed the question wrong. Suppose the growth of a population in millions is modeled by 3.2 * (4.72^t. What is the size of the population initially?

Algebra
Suppose the growth of a population in millions is modeled by 3.2*(4.72)^t. What is the size of the population in millions?

Physics
A free electron is captured by a proton forming a Hydrogen atom. If the electron ends up in the ground state then what is the wavelength of the photon it emits during this process?

Physics
A free electron is captured by a proton forming a Hydrogen atom. If the electron ends up in the ground state then what is the wavelength of the photon it emits during this process?

science
A free electron is captured by a proton forming a Hydrogen atom. If the electron ends up in the ground state then what is the wavelength of the photon it emits during this process?

physics
Many subatomic particles have the same charge as an electron (e) but much different masses. For instance, the muon has the same charge as an electron but its mass is roughly 207 times greater. Explain the changes you would have to make to the e/m tube and Helmholtz coils if yo...

physics
A continuous stream of water is flowing out of a faucet and falling into a sink below. Explain why this stream of water is narrower at the bottom (near the sink) than at the top (near the faucet).

physics
A seashell is basically an open-closed tube rolled up. Explain why you hear a roaring sound (the sound of the sea) when you place a seashell (or any other kind of tube) up to your ear.

physics
Explain how the pitch of the roaring sound relates to the length of the tube.

Chemistry
Chromatography How can I tell which of two mobile phases is more polar? Does the fact that one solvent (e.g. isopropanol/ammonia) moves up the TLC plate slower than another solvent (e.g. hexane/ethyl acetate/ethanol)? Or should I look at how far up the dyes have moved?

: Arithmetic Sequence
13,26,39,52

physics
In a ballistic motion experiment with a ball being lanched from a ballistic launcher and hitting a impact point.How do we explain how the work done by non-conservative forces UNC changes the impact distance.

algebra
a.(16-2+13=27) B.(8+2-9=11) c.(3-10+9*7=56) right a and c are correct b is wrong first you said B is wrong then you said its right 18 + 2 - 9 = 11

algebra
simplify: 2+3*10/5*3-9= A.-5, B.21, C.-60, D.11 , 2+18-9= 20-9=11 so 11 is right i don't got it can you explain more thanx.

algebra
a.(16-2+13=27) B.(8+2-9=11) c.(3-10+9*7=56) right

algebra
and thank you again

algebra
simplify: 2+3*10/5*3-9= A.-5, B.21, C.-60, D.11 (B) is the answer right

algebra
16-10/5+13= A.31,B.1/3,C.139/9,D.27 B is my answer is it right

math
the smith family is going to buy a home for $150.000.they will need a 10%down payment.how much will they need? my answer is $15,000 is it right

math
emily wants a new dress.she only has $30 to spend.she lives in florida where the sales tax is 5%.about(estimate)how much can the dress cost if she wants to spend all her money? a.30,b.29.50,c.28,d.20 i don't get it

math
emily wants a new dress.she only has $30 to spend.she lives in florida where the sales tax is 5%.about(estimate)how much can the dress cost if she wants to spend all her money? $28 right

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