Monday
October 20, 2014

Posts by CHARLES


Total # Posts: 260

Science
spring scale
September 14, 2014

math
In order to pass a physical education class at a university, a student must run 1.0 mi in 12.5 min. After running for 10.0 min (assume constant speed), she still has 510 yd to go. What constant acceleration does she need over the final 510 yd in order to make it?
September 14, 2014

Physics
Just saw the flaw. -2.5 in vector B should be -3.5. This has had me stuck for too long.
August 30, 2014

Physics
Thank you for that. I don't understand the rule for "Cy/Cx = 5/6.5; if Cx = 6.5k, then Cy = 5k." I also realize that your solution doesn't match my book's solution. Here's the step by step from the book that I'm not understanding either, perhaps ...
August 30, 2014

Physics
You are given vectors A = 5.0i - 6.5j and B = -2.5i + 7.0j. A third vector C lies in the xy-plane. Vector C is perpendicular to vector A and the scalar product of C with B is 15.0. Find the x and y components to vector C. Answer key shows x component is 8.0, y component is 6.1...
August 30, 2014

chemistry
In the combustion of hydrogen gas, hydrogen reacts with oxygen from the air to form water vapor. If you burn 54.8 g of hydrogen and produce 4.90 × 10^2 g of water, how much oxygen reacted?
August 29, 2014

chemistry
In the combustion of hydrogen gas, hydrogen reacts with oxygen from the air to form water vapor. If you burn 54.8 g of hydrogen and produce 4.90 × 102 g of water, how much oxygen reacted?
August 29, 2014

Physics
A stone projected vertically upward with a speed of 30ms from the top of a tower of height 50m neglecting the air resistance.determine the maximum height it reach from the ground
August 5, 2014

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?
July 18, 2014

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?
July 11, 2014

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?
July 11, 2014

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?
July 8, 2014

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.
May 26, 2014

math
f (x) = (50-w) (75-w)?
April 25, 2014

algebra
how many{distinct letters in the word food}
April 11, 2014

algebra
{distinct letters in the word food}
April 11, 2014

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).
April 7, 2014

physic
A 69-cm-diameter wheel accelerates uniformly about its center from 150rpm to 320rpm in 4.4s . Determine angular acceleration?
March 29, 2014

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.
March 29, 2014

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 ...
March 2, 2014

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...
March 2, 2014

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 ...
December 13, 2013

English
We heard tommy's loud drumming clearly despite the _______ of the elementary school band practice. A. Esprit B. Concordance C. Animadversion
October 28, 2013

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 ...
October 12, 2013

College Algebra
Express 0.000093 in scientific notation. Can anyone help?
September 8, 2013

physics
determine the pressure of a 20 lb force is applied to an area of 10 inch squared
September 7, 2013

physics
determine the pressure of a 20 lb force is applied to an area of 10 inch squared
September 7, 2013

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.
August 30, 2013

Reading
Is the main characher in Football Futigive more like an equilateral isosceles or scalene?
August 28, 2013

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?
August 24, 2013

economics
In the simple economics of a competitive market price increases under which condition?
August 14, 2013

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...
July 26, 2013

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 ...
July 26, 2013

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 ...
July 26, 2013

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 = ...
July 26, 2013

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...
July 26, 2013

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
July 26, 2013

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
July 26, 2013

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
July 26, 2013

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 ...
July 26, 2013

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...
July 26, 2013

liberal art math
slope intercept form of x + 3y + -6
July 7, 2013

Physics
I don't understand the flow in the math here. Please help me understand this solution by "dumbing it down" a bit.
June 23, 2013

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.
June 21, 2013

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
May 15, 2013

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.
May 11, 2013

L.O
5 ways in which the human or enviromental problem impacts on the community.
April 10, 2013

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?
March 26, 2013

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?
March 26, 2013

Chemistry
I only need help with parts c) and d)
March 23, 2013

northrise university
What is natural law?
March 20, 2013

math
what is the speed of a runner who can run 400 metre in 76 seconds
March 19, 2013

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 ...
March 8, 2013

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?
February 28, 2013

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?
February 28, 2013

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 ...
February 15, 2013

Math
Figured it out 5 cents
February 14, 2013

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 ?
February 14, 2013

math
1.As the 1st quantity increases, the 2nd quantity also increases. 2.As the 1st quantity increases, the second quantity decreases.
February 6, 2013

Maths
How can we find the antilogarithm of 9.485?
January 31, 2013

art
c d a c b d d d c d b
January 23, 2013

math
if Tom is driving 64 kilometers/hour what is his speed in miles/hour?
January 23, 2013

Math
Solve the equation sin2x=2cos2x, for 0 degrees <=x<=180 degrees
January 14, 2013

7 th grade math
5/4 or 1 1/4 since when you divide fractions you multiply by the reciprocal
December 12, 2012

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%.
November 3, 2012

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?
October 25, 2012

Criminal Justice
How does the structure of the government relate to the criminal justice system?
October 21, 2012

algebra
5x/9-11=-51
September 20, 2012

building mechanism
Explain the working principle of a sliding door on a horizontal surface on the floor.
August 27, 2012

Physics
Q=12,914.805 cal
July 31, 2012

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
June 25, 2012

Statistics
vxzvxcvcvcx
May 21, 2012

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.
April 22, 2012

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
April 22, 2012

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.,
April 22, 2012

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.,
April 22, 2012

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.
April 22, 2012

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 ...
April 12, 2012

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
April 8, 2012

math
Determine the mimimum furnace output for a 2100 sq feet modern house using the formula B=31a
April 1, 2012

Chemistry
how does the addition of a nonvolatile solute affect the vapor pressure of the solvent into which it is dissolved?
March 4, 2012

Physics
Laser Pointers emit light waves whose wavelength is 670 nm. What is the frequency for this light?
February 23, 2012

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?
February 14, 2012

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
February 11, 2012

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
February 11, 2012

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 ...
January 24, 2012

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.
January 2, 2012

Math
How can pupils be easily helped to understand base ten concepts
December 10, 2011

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 ...
December 2, 2011

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) ...
December 2, 2011

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?
November 30, 2011

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
November 21, 2011

math
Having trouble solving: w^2 +5w -40
November 21, 2011

advance algebra
how to find the lcm of 15,27
November 10, 2011

social studies
List three states that don't have ports on the atlantic ocean
November 7, 2011

Geometric progression
Solution.Tn=ar'n-1 where n=3
October 23, 2011

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.
October 21, 2011

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
October 14, 2011

algebra
1. The statement 3x – 4 = 2x + 9 is called .
October 11, 2011

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
September 24, 2011

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