Wednesday
July 30, 2014

Posts by Charles


Total # Posts: 253

Math
A homeowner is laying sod in her lawn. The lawn is a rectangle with dimensions of 28'*18'. If one piece of sod is a rectangle with dimensions of 60 cm*40 cm, approximately how many pieces of sod should the homeowner order?

physics
With brakes fully applied, a 1370 kg car deccelerates from a speed of 98.0 km/hr. What is the work done by the braking force in bringing the car to a stop?

physics
A force of 1.57 N pushes against an object with a mass of 0.16 kg for 3.00 min. The object does not move. What is the work done on the object by the force?

chemistry
What is the mass of water obtained when mix 100.0 mL of 2.5 M. HNO3 with 100.0 mL of 2.55 M. KOH?

chemistry
Calculate the mass of oxygen (in mg) dissolved in a 5.00 L bucket of water exposed to a pressure of 1.13 atm of air. Assume the mole fraction of oxygen in air to be 0.21 and the Henry's law constant for oxygen in water at this temperature to be 1.3 x 10-3 M/atm.

math
f (x) = (50-w) (75-w)?

algebra
how many{distinct letters in the word food}

algebra
{distinct letters in the word food}

physic
If wind blows at 34m/s over a house, what is the net force on the roof if its area is 170m2 and is flat? (At 20 ∘ C dry air has a density of 1.2 kg/m3).

science
Imagine that you are the scientist who discovered cells. If you were to give a speech to a group of fellow scientists, what key points would you include that describe your accomplishments?

physic
A 69-cm-diameter wheel accelerates uniformly about its center from 150rpm to 320rpm in 4.4s . Determine angular acceleration?

Physic
Calculate the mass m needed in order to suspend the leg shown in the figure(Figure 1) . Assume the leg (with cast) has a mass of 15.5kg , and its CG is 35.5cm from the hip joint; the sling is 76.5cm from the hip joint.

Physical Science
The air temperature on a certain day is 86 degrees F A)Convert to Celsius? B) Calculate the sound of speed in air? C)When a 653Hz tornado siren is turned on, the sound takes 2.3s to reach an observer. How far is the observer from the main siren, and what is the wavelength of s...

Physical Science
An ultrasonic wave in water is a compression wave that travels at 1,400 m/s A) An ultrasonic wave from a ship travels to the bottom of a lake and back in 0.16s. How deep is it at this point? B) If an ultrasonic wave is emitted in the ocean where the ocean's depth is 3.5km,...

Chemistry
Can someone please help me answer these questions? Is additional information other than what is given needed to solve? Thanks in advance. 1) Calculate the PH of a buffer containing 0.100 M propanoic acid, HC3H5O2 and .100 M NaC3H502 after the following have been added. Ka for ...

English
We heard tommy's loud drumming clearly despite the _______ of the elementary school band practice. A. Esprit B. Concordance C. Animadversion

science
I am doing a titration lab and need help with a problem. (i used .100M H2SO4)(I used 10.0 ml of Ba(OH)2 solution and added 50.0 ml of distilled water making 60.0 ml total.) 1. Use the titration results to calculate the moles of H2SO4 that were used to reach the equivalence poi...

College Algebra
Express 0.000093 in scientific notation. Can anyone help?

physics
determine the pressure of a 20 lb force is applied to an area of 10 inch squared

physics
determine the pressure of a 20 lb force is applied to an area of 10 inch squared

Physics
“Strontium-90 is a pure beta source.” How could a physicist test this statement? I am stuck on this one, but I was thinking through measurement of radioactivity.

Reading
Is the main characher in Football Futigive more like an equilateral isosceles or scalene?

math
Dents and Dings Auto Body buys paint with a list price of $29,000. If the supplier extends trade discounts of 30/35/20, what is the trade discount amount?

economics
In the simple economics of a competitive market price increases under which condition?

General Physics
A 4 kg block slides along a frictionless horizontal with a speed of 5.1 m/s. After sliding a distance of 7 m, the block makes a smooth transition to a frictionless ramp inclined at an angle of 13 degrees to the horizontal. The acceleration of gravity is 9.81 m/s2. How far...

General Physics
A 0.377 kg bead slides on a curved wire, starting from rest at point A(4.8 meters) as shown in the figure. The acceleration of gravity is 9.8 m/s2 . A. If the wire is frictionless, find the speed of the bead at B(0 Meters). Answer in units of m/s B. Find the speed of the bead ...

General Physics
A block sliding on a horizontal surface has an initial speed of 0.5 m/s. The block travels a distance of 1 m as it slows to a stop. What distance would the block have traveled if its initial speed had been 1 m/s? 1. 2 m 2. 1 m 3. more information is needed to answer the questi...

General Physics
Suppose that the force on the block FT is increased so that the block accelerates (starting from rest) at a = 2.2 m/s2. Now what is the net work done by all the forces acting on the block as it moves a distance of 15 m? 1. Wnet = −1968.75 J 2. Wnet = 1155 J 3. Wnet = 280...

General Physics
A 35 kg block is pulled at a constant speed along a horizontal surface by a rope with tension FT . The rope is inclined at an angle from the horizontal as shown. The block moves a distance 15 m along the horizontal surface. What is the net work done by all the forces acting on...

General Physics
A force Fx acts on a particle. The force is related to the position of the particle by the formula Fx = (5.9 N/m3) x3. Find the work done by this force on the particle as the particle moves from x = 0.9 m to x = 22 m. Answer in units of J

General Physics
A spring with spring constant of 28 N/m is stretched 0.2 m from its equilibrium position. How much work must be done to stretch it an additional 0.06 m? Answer in units of J

General Physics
A 7453 N piano is to be pushed up a(n) 4.04 m frictionless plank that makes an angle of 25.9 with the horizontal. Calculate the work done in sliding the piano up the plank at a slow constant rate. Answer in units of J

General Physics 1
A force ~F = Fx ˆý+Fy ˆ| acts on a particle that undergoes a displacement of ~s = sx ˆý + sy ˆ| where Fx = 10 N, Fy = −4 N, sx = 6 m, and sy = 1 m. 1. Find the work done by the force on the particle. Answer in units of J 2. Find the angl...

General Physics 1
A simple Atwood's machine uses a massless pulley and two masses m1 and m2. Starting from rest, the speed of the two masses is 4.8 m/s at the end of 5.5 s. At that time, the kinetic energy of the system is 33 J and each mass has moved a distance of 13.2 m. 1. Find the value...

liberal art math
slope intercept form of x + 3y + -6

chemistry
Calculate the mass in grams for a sample of water that absorbs 8200J when its temperature rises from 20.4∘C to 93.8∘C.

Math
How do I identify the initial value and the growth or decay for these problems? a) Q=25000 x (1/2)^t b) y=350 x 5* c) N=5000 x (9/10)^t

Chemistry
Determine the theoretical and percent yield of hydrogen gas if 78.5 g water undergoes electrolysis to produce hydrogen and oxygen and 3.23 g hydrogen is collected.

L.O
5 ways in which the human or enviromental problem impacts on the community.

chemistry
A generic salt, AB, has a molar mass of 293 g/mol and a solubility of 2.20 g/L at 25 °C. What is the Ksp of this salt at 25 °C?

chemistry
A generic salt, AB, has a molar mass of 293 g/mol and a solubility of 2.20 g/L at 25 °C. What is the Ksp of this salt at 25 °C?

Chemistry
I only need help with parts c) and d)

northrise university
What is natural law?

math
what is the speed of a runner who can run 400 metre in 76 seconds

college algebra
An advertising agency conducted a survey and found that the number of units sold, N, is related to the amount a spent on advertising (in dollars) by the following formula: N = 6,500 + 200 ln a (a ¡Ý 1) How many units are sold after spending $1,000? (Round your an...

Math
Elbert wants to plant grass seed in his backyard. His yard is shaped like a rectangle that is 6 meters by 7 meters. He plans to use a cup of seed for every square meter in his yard. How many cups of grass seed will he need?

Math
Serena has a square-shaped garden. She wants to put a fence around the outside of the garden. One side of the garden is 8 feet long. How many feet of fence will she need?

math
What is the PROCUREMENT cost of this system? Cost Types Cost (in millions) Research/Development $400 Procurement of Prime mission $800 Procurement of support equipment $100 Procurement of Initial Spares $100 Operations & and Support $70,000 Disposal $100 ANWERS! (A). 800 milli...

Math
Figured it out 5 cents

Math
A mother of triplets wants to buy gum balls the machine has two colors how much will it cost to get three gum apps the same color ?

math
1.As the 1st quantity increases, the 2nd quantity also increases. 2.As the 1st quantity increases, the second quantity decreases.

Maths
How can we find the antilogarithm of 9.485?

art
c d a c b d d d c d b

math
if Tom is driving 64 kilometers/hour what is his speed in miles/hour?

Math
Solve the equation sin2x=2cos2x, for 0 degrees <=x<=180 degrees

7 th grade math
5/4 or 1 1/4 since when you divide fractions you multiply by the reciprocal

Physical Science
Efficiency is "Efficiency = (useful work output / work input)" So the problem would look like: EC = (40/100) Divide 40 by 100, and you get 0.4 - which is 40%.

Chemistry
Ca(OH)2 reacts with CO2 to form CaCO3 and H2O. A. How many grams of CaCO3 will be formed if 4 grams of Ca(OH)2 are used? B. If you have 2.5 grams of Ca(OH)2 and 0.5 of CO2, which is the limiting reactant?

Criminal Justice
How does the structure of the government relate to the criminal justice system?

algebra
5x/9-11=-51

building mechanism
Explain the working principle of a sliding door on a horizontal surface on the floor.

Physics
Q=12,914.805 cal

Physics
Q=12,914.805 cal

physics
if a neutral shere and a sphere with a charge of 14 C are brought together, then separated, what would be the charge on each sphere

Statistics
vxzvxcvcvcx

Government
1.DISCUSS THE NATURE OF CORRUPTION BY PUBLIC OFFICERS 2.DISCUSS THE CAUSE OF CORRUPTION BY PUBLIC OFFICERS 3.FORMS BY PUBLIC OFFICERS 4.means of eradicating controling corruption in public establishment.

Government
Nigeria has been characterized as the most corrupt country in the world and evidence of corruption has been manifested daily by public officers. My question Discuss the nature, cause , forms and means of eradicating controling corruption in public establishment. Pls help me

Accounting
1.state ten users of accounting information and show their intrest 2. Enlimurate eight qualities that accounting information must poses. 3. Itemize at least eight roles of accounting in any organisation.,

Accounting
1.state ten users of accounting information and show their intrest 2. Enlimurate eight qualities that accounting information must poses. 3. Itemize at least eight roles of accounting in any organisation.,

Accounting
State ten users of accounting iformation and show their intrest 2 enumurate eighth qualities that accounting information must posses 3. Itemize at least eight rules of accounting in any organisation.

statistics
You think that the best sampling strategy is stratified sampling. Youd like to list the characteristics of schools in this district, then randomly select 80 schools who roughly match the demographic characteristics of the entire population of schools in this district. 40 of th...

Chemistry
Steam is compressed reversibly to liquid water at the boiling point 100C. The heat of vaporisation of water at 100C and 1.01325 bar is 2258Jg^-1. Calculate for one mole of water in term of work done(w),q,H and U for the process

math
Determine the mimimum furnace output for a 2100 sq feet modern house using the formula B=31a

Chemistry
how does the addition of a nonvolatile solute affect the vapor pressure of the solvent into which it is dissolved?

Physics
Laser Pointers emit light waves whose wavelength is 670 nm. What is the frequency for this light?

College Physics
A tiger leaps horizontally from a 15.0 m high rock with a speed of 7.10 m/s. How far (in meters) from the base of the rock will it land?

Math/Trig
Which logarithmic equation is equivalent to L^m = E 1) LogL E = m 2) logE L = m 3) logm E= L 4) logE m= L

Trigonometry
This is a logs question If u=x/y^2, which expression is equivalent to log u? 1) log x + 2 log y 2) 2(log x- log y) 3) 2(log x + log y) 4) log x- 2 log y

physics
A mass with an initial combined potential energy and kinetic energy of 10,000 joules is dropped onto a fence post to drive it into the ground. The post is driven 0.25 meters into the ground before it comes to rest with the mass sitting on top of the post. How much work was don...

statistics
Use the data given in table 13.1 on page 846 to construct a frequency distribution with a first class ( in ten thousands ) of 150-296.

Math
How can pupils be easily helped to understand base ten concepts

PHYSICSI
The rotating loop in an AC generator is a square 11.0 cm on a side. It is rotated at 60.0 Hz in a uniform field of 0.800 T. Calculate the following quantities as functions of time t, where t is in seconds. (a) the flux through the loop mT·m2 (b) the emf induced in the l...

physics
A small airplane with a wingspan of 13.5 m is flying due north at a speed of 70.8 m/s over a region where the vertical component of the Earth's magnetic field is 1.20 µT downward. (a) What potential difference is developed between the airplane's wingtips? mV (b) ...

physics
A ball is dropped from a roof to the ground 4.00 m below. Exactly 0.400 s later, a rock is thrown downwards with some initial velocity. If the two objects hit the ground at exactly the same time, what was the initial speed of the rock?

math
Bairleys rectangular dog pen for his irish setter must have an area of 400 square feet. Also the length must be 50 feet longer than the width. Find the dimentions of the pen

math
Having trouble solving: w^2 +5w -40

advance algebra
how to find the lcm of 15,27

social studies
List three states that don't have ports on the atlantic ocean

Geometric progression
Solution.Tn=ar'n-1 where n=3

chemistry
In the reaction of N2 and H2 to produce NH3, how many moles of H2 will produce 37.9 grams NH3 if sufficient N2 is present? Do not enter units with your answer.

physics
if i ran a 4.6 forty yard dash and i ran down hill at a max speed of 18 miles per hour and punched you right in the face how many foot pounds of pressure would my hit have

algebra
1. The statement 3x – 4 = 2x + 9 is called .

statistics
What is the probability a student answer at least 4 out of five questions correctly on a quiz? n=15, x>=4, p=.20, q=.80

arithmetic
first term and larst term of a geometric progression is 42.if the forth term is greater than the second term by 168, find the first term.the forth term.

HELP!!!!!!!!!GEOMETRY!!!!
P=4.(17)^1/2

MATH
HASAN MADE A MODEL FOR 437 HUNDREDS, 3 TENS,AND 7.WHAT ARE TWO OTHER WAYS HE COULD SHOW 437 USING BASE-TEN BLOCKS?

Logic
Choose the pair of words/phrases among the choices that exhibits the same logical relationship as the words/phrases in the following pair. heavy : weight dry : wet feather : scale #hot : temperature color : size I placed a # next tom my answer.

government
The WPA was paid for by posting US Bonds with the phrase "Reinvest in America" Couldn't the money now spent on unemployment and job retraining be so much better spent on a new version of the WPA than simply paying unemployed people a check every week for nothing ...

government
During the middle 1930s the WPA (Works Progress Administration) put unemployed people to work building bridges, roads and school paid for by posting US Bonds. Why could that not work to solve economic and similar problems today?

trig
Write the expression and evaluate. There is only one answer whIch should match the range of the inverse trig function. Sec^-1(-2) I got 2pi/3 could someone tell me if that is right? And if not, could someone please explain how to get the answer.

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