Wednesday
April 16, 2014

Posts by charles


Total # Posts: 245

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?

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?

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

physics
thank you

physics
sorry

physics
B and C are on the same shaft

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?

physics
Thank you

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?

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 onl...

physics
thank you for your help drwls

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 ...

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?

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?

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...

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...

Physics 204
Than you for your help

Physics 204
So to figure out maximum friction force possible without sliding, thats 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

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?

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, w...

Chemistry
thanks very much!

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

Chemistry
whys does it floats on gasoline and not ethanol?

Chemistry
Gasoline: 737.22 kg/m3 Ethanol: 0.789 g/cm³

Chemistry
shouldn't you be the one telling me that.?

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

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

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?

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

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

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

Multiplying and Dividing Rational Expressions
3-9/x/x-8+15/x

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

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. =)

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 ...

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.

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 destr...

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...

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 ohm...

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...

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...

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 th...

qualities of persuasive business messages
ctu

the big idea of energy
help me with the big energy thing with mg

science
error

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