Thursday
March 30, 2017

# Posts by charles

Total # Posts: 384

what spooky creature that have seven letters in it
October 13, 2009

Algebra ll
how do yu graph linear equations
September 30, 2009

Math 116
what is the fraction and decimal of 42 6/7
February 19, 2009

Electronics
If the frequency of an RC oscillator connected to CLKIN is 96 KHz on A PIC 16F877a, the frequency on CLKOUT would be?
December 3, 2008

electronics
If the frequency of the crystal oscillator is 20 MHz on a PIC16F877a, the frequency of the signal on OSC1/CLKOUT would be?
December 3, 2008

Electronics
If the frequency of the crystal oscillator is 20 MHz on a PIC16F877a, the frequency of the signal on OSC1/CLKIN would be?
December 3, 2008

Calculus
you almost in there already, think about the cos(theta) = 0, it means the theta=90 degree, so, you got it
October 26, 2008

Physics Help2I!!!
i have a question in here, what is the friction coefficient between the books and the table if those books sit on the table.
October 26, 2008

algebra
what should you not do if you want to help get rid of graffiti
October 26, 2008

english
I need an object to represent the beginning of one flew over the cuckoo's nest for a proj. Any ideas?
October 20, 2008

physics
A hydraulic lift office chair has it's seat attached to a piston with an area of 11.2cm squared. The chair is raised by exerting force on another piston, with an area of 4.12 cm squared. If a person sitting on the chair exerts a downward force of 219 N, what force needs to...
October 14, 2008

Math (Trig)
What does sec^2(-2) equal? Can you explain why?
October 8, 2008

Calculus-Derivatives
How is 6#sin(#x-1)/cos^3(#x-1) the derivative of f(x)= 3sec^2(#x-1)? #= Pi (I coulnd't find the symbol...sorry.)
September 28, 2008

Calculus
drwls: thanks for your help. would you mind explaining how you used that identity to set up the new problem? i get the chain rule but i had no idea that sin2xcos2x was equal to 1/2sin4x. thanks again.
September 28, 2008

Calculus
How is 2cos(4x) the derivative of f(x)=sin(2x)cos(2x)?
September 28, 2008

critical thinking
Describe a time when your moral values influenced the way you responded to an issue. · What differences did you notice between your logical reasoning process and your moral reasoning process? What were the possible consequences or outcomes
August 31, 2008

Electronics
With a carrier voltage of 80Vp-p and %m at 100 what is Vm,Vmax,Vmin,Vusb,Vlsb
May 5, 2008

Electronics
If Vmax is 18V and Vmin is 6V what is %m,Vc,Vm,Vusb,Vlsb
May 5, 2008

ECT
If Vmax is 18V and Vmin is 6V what is %m,Vc,Vm,Vusb,Vlsb
May 5, 2008

Communication
If Vmax is 18V and Vmin is 6V what is %m,Vc,Vm,Vusb,Vlsb
May 5, 2008

Communication
With a carrier voltage of 80Vp-p and %m at 100 what is Vm,Vmax,Vmin,Vusb,Vlsb
May 5, 2008

organizational theory and behavior
• Identify elements of group effectiveness that you may be able to influence.
April 14, 2008

computers
Pls I need a simple access control program written in either basic or fortran programming language.
March 13, 2008

chemistry
An increase in the average kinetic energy of a sample of copper atoms occurs with an increase in a. concentration b. pressure c. volume d. temperautre
March 5, 2008

chemistry
According to Solubility guidelines chemistry reference table, which of these salts is least soluble in water? a- PbCl2 b- RbCl c- LiCl d- FeCl2
March 5, 2008

Chemistry
According to Solubility guidelines chemistry reference table, which of these salts is least soluble in water? a- PbCl2 b- RbCl c- LiCl d- FeCl2
March 5, 2008

Chemistry
An increase in the average kinetic energy of a sample of copper atoms occurs with an increase in a- Concentration b- Pressure c- Volume d- Temperature
March 5, 2008

Physics
How long would it take for a beam of light to travel around the earth in an ideal fiber-optic cable?
February 18, 2008

Physics
Thank you
February 11, 2008

Physics
A person with a mass of 85kg. How much in newtons do they weigh on the earth and the moon?
February 11, 2008

Physics
Thank you
February 11, 2008

Physics
The moon orbits 3.84 x 10^8m form the center of the earth. How fast does the moon travel in meters per second?
February 11, 2008

Physics
Find the orbital velocity of a satellite orbiting 1800km above sea level in meters per second?
February 11, 2008

Physics
Find the gravitational force between the sun and the earth in newtons?
February 11, 2008

Physics
If you fell into a hole in the Earth how long would it take to reach the center of the earth if your velocity remained constant at 100mph?
February 8, 2008

Physics
The average radius of the earth is 6.38*10^6m. Is the diameter just twice that or 12.8*10^6m. The circumference is 6.28(6.38*10^6)=40.1*10^6m
February 8, 2008

Physics
Find the attracting force between 2 people sitting .08 meters apart. One person has a mass of 62kg and the other 80kg.
February 8, 2008

Physics
I know the velocity would not remain the same but if it did what would the answer be
February 8, 2008

Physics
If you fell into a hole in the Earth how long would it take to reach the center of the earth if your velocity remained constant at 100mph?
February 8, 2008

Physics
If you were to jump from an airplane at an altitude of 15000 ft. and fall toward the Earth at 100 mph how long would it take to reach the surface?
February 8, 2008

Physics
A satellite is in orbit 2500km above the surface of Earth. What is the velocity of the satellite in m/s?
February 8, 2008

physics
thank you
February 6, 2008

physics
B and C are on the same shaft
February 6, 2008

physics
If gear A has 30 teeth and is spinning at 800rpm, gear B has 50 teeth and gear C has 20 teeth and gear D is spinning at 300rpm. How many teeth does gear D have?
February 6, 2008

physics
Thank you
February 6, 2008

physics
A lawn tractor tire turns at 65rpm and has a radius of 13cm. What is the linear speed of the tractor in m/s?
February 6, 2008

math
I always thought I understood significant figures...until I attempted to tutor someone. Some of the rules seem counterintuitive. For instance... 10.070 why is it 5 sig fig's? the "0" on the right is useless. without it the # holds the same value. 20 Why is it ...
January 30, 2008

physics
thank you for your help drwls
January 27, 2008

physics
One last question: If a 12lb. block is slowly tilted from horizontal when the plank reaches 30 degrees the block begins to slide. To find the coefficient of the static friction you take the tangent form of 30 degrees? To find the friction force you multiply the coefficient of ...
January 27, 2008

physics
3.A force of 26lbs. causes impending motion. If the force is maintained at 26lbs.Fn=Fw=65lbs and the sliding friction is .28. find: a.mass of the block b.FF c.acceleration What force must be maintained to cause an acceleration of 2ft/s^2?
January 26, 2008

physics
2.A plank is tilted slowly to an angle of 30 degrees with a 12 pound block on it Find FN, FF and the static friction?
January 26, 2008

physics
1.If a block weighs 30 pounds and has a static friction of .7 and a sliding friction of .55 and Fn=Fw a. How much force must be applied to just cause motion? b. Once motion has begun what force must be maintained to cause constant velocity motion? 2.A plank is tilted slowly to...
January 26, 2008

physics 204
1.If a block weighs 30 pounds and has a static friction of .7 and a sliding friction of .55. a. How much force must be applied to just cause motion? b. Once motion has begun what force must be maintained to cause constant velocity motion? 2.A plank is tilted slowly to an angle...
January 26, 2008

Physics 204
January 21, 2008

Physics 204
So to figure out maximum friction force possible without sliding, that's the product of the 23lb block and the static friction of .6. that will be A? Then I'm not sure what to do next
January 21, 2008

Physics 204
If there is a 23lb. block on a plank and the static friction is .6 and the sliding friction is .35. What angle must the plank be raised to just allow the box to slide?
January 21, 2008

Physics 204
I have a few questions. 1.The coefficient of sliding friction between steel skate blades and ice is .05. How much force must be applied to a 150lb. skater to maintain a constant velocity? 2. If it takes a force of 6 pounds to cause a 24 pound box to slide on a level surface, ...
January 21, 2008

Accounting Help Needed
November 30, 2007

Chemistry
thanks very much!
September 25, 2007

Chemistry
What do i do when i have a question that ask to compare the size and density of an atom with its nucleus.
September 25, 2007

Chemistry
whys does it floats on gasoline and not ethanol?
September 20, 2007

Chemistry
Gasoline: 737.22 kg/m3 Ethanol: 0.789 g/cm³
September 20, 2007

Chemistry
shouldn't you be the one telling me that.?
September 20, 2007

Chemistry
A piece of wood sinks in ethanol but floats in gasoline. Give a range of possible densities for the wood?
September 20, 2007

Chemistry
The density of water is 1.0 g/mL. How many deciliters of water will fill a 0.5-L bottle?
September 20, 2007

Chemistry
A shiny gold colored car of metal weighting 57.3g has a volumes of 4.7cm^3. Is the bar of metal pure gold?
September 20, 2007

Chemistry
would the density of a person be the same on the surface of earth and on the surface of the moon? explain?
September 20, 2007

social studues
what are the advantages and disadnavtages of using a globe to show earth surface
September 18, 2007

Math
Choose four number from one to five, with reprtitions allowed, to creat the largest standard deviation possible.
September 17, 2007

Social Studies 4
Why was Churchill concerned about Soviet influence and control from Moscow? http://www.loc.gov/exhibits/churchill/wc-coldwar.html http://en.wikipedia.org/wiki/Origins_of_the_Cold_War#The_breakdown_of_postwar_peace_.281945-1947.29
April 18, 2007

Social Studies 3
What did Churchill mean when he said "iron curtain"? You need to start stating what YOU think the answers are for YOUR questions. Then the tutors here will be able to give you feedback and point you in the right direction if needed. =)
April 18, 2007

Social Studies 2
What were the closest non-Communist European countries to the Soviet Union? Finland had a long history of trade and cordial diplomatic relations with the Soviet Union. After 1984, France, Austria, the Federal Republic of Germany (West Germany), and Italy joined in. They began ...
April 18, 2007

Social Studies 1
Which countries separated the Soviet Union from Western Europe? The so-called Warsaw Pact countries. Use Google or anothe search engine for references that will provide their names.
April 18, 2007

Social Studies
During the cold war Era (1945-1990), the United states and the Soviet Union were reluctant to become involved in direct military conflict mainly because 1. the peacekeeping role of the united nations 2. pressure from nonaligned nations 3. the potential for global nuclear ...
April 18, 2007

Social Studies
>Blockade of Berlin >Operation of the Berlin Airlift >Organization of the Warsaw Pact >Construction of the Berlin Wall These events of the cold war are examples of 1. efforts to prevent military conflict between the superpowers 2. situations that increased tensions...
April 18, 2007

Physics - electricity
An incandescent lamp is marked '120v,75W' a)what is the current in the lamp under normal condition of operation? b)How much does it cost per hour to operate the lamp if the price of electrical energy is \$6.00 per unit? Please stop posting under different names. Use ...
April 17, 2007

Plz help Physics-bobpursley
Bob, please confirm if I got this right and if not, please help to solve 1)A wire has a resistance of 10 ohm at 20 deg celsius and 13.1 ohm at 100 deg celsius. Obtain a value for its temperature coefficient of resistance. ans I got is this= using Rt = Ro (1 + alpha(T-To)) 13.1...
April 17, 2007

Physics
Please can you help out: 1)The Potential diff across the terminals of a battery is 8.5v when there is a current of 3amps in the cct from the -ve to the +ve terminal. When the current is 2amps in the reverse direction, the potential diff becomes 11volts. a) what is the internal...
April 17, 2007

Maths-Vectors Help!
Please can you help me as I have just been introduced to your Help Forum: Determine whether the vectors u, v and w given below are linearly independent or dependent where u, v and w are non-colliner vectors such that u=2a-3b+c , v=3a-5b+2c and w=4a-5b+c. thanks. Use exactly ...
April 16, 2007

the big idea of energy
help me with the big energy thing with mg
December 5, 2006

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