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Charles

Questions (249)

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.)
1. 1 answer
2. 2,000 views
How is 2cos(4x) the derivative of f(x)=sin(2x)cos(2x)?
1. 3 answers
2. 886 views
With a carrier voltage of 80Vp-p and%m at 100 what is Vm,Vmax,Vmin,Vusb,Vlsb
1. 1 answer
2. 587 views
If Vmax is 18V and Vmin is 6V what is%m,Vc,Vm,Vusb,Vlsb
1. 1 answer
2. 482 views
If Vmax is 18V and Vmin is 6V what is%m,Vc,Vm,Vusb,Vlsb
1. 1 answer
2. 569 views
With a carrier voltage of 80Vp-p and%m at 100 what is Vm,Vmax,Vmin,Vusb,Vlsb
1. 0 answers
2. 437 views
Pls I need a simple access control program written in either basic or fortran programming language.
1. 1 answer
2. 459 views
An increase in the average kinetic energy of a sample of copper atoms occurs with an increase ina. concentration b. pressure c.
1. 2 answers
2. 2,144 views
According to Solubility guidelines chemistry reference table, which of these salts is least soluble in water?a- PbCl2 b- RbCl c-
1. 2 answers
2. 2,437 views
According to Solubility guidelines chemistry reference table, which of these salts is least soluble in water?a- PbCl2 b- RbCl c-
1. 1 answer
2. 928 views
An increase in the average kinetic energy of a sample of copper atoms occurs with an increase ina- Concentration b- Pressure c-
1. 2 answers
2. 1,439 views
How long would it take for a beam of light to travel around the earth in an ideal fiber-optic cable?
1. 1 answer
2. 538 views
A person with a mass of 85kg. How much in newtons do they weigh on the earth and the moon?
1. 5 answers
2. 4,496 views
The moon orbits 3.84 x 10^8m form the center of the earth. How fast does the moon travel in meters per second?
1. 2 answers
2. 1,194 views
Find the orbital velocity of a satellite orbiting 1800km above sea level in meters per second?
1. 1 answer
2. 460 views
Find the gravitational force between the sun and the earth in newtons?
1. 1 answer
2. 452 views
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
1. 1 answer
2. 391 views
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
1. 2 answers
2. 676 views
Find the attracting force between 2 people sitting .08 meters apart. One person has a mass of 62kg and the other 80kg.
1. 1 answer
2. 475 views
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
1. 2 answers
2. 414 views
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
1. 2 answers
2. 453 views
A satellite is in orbit 2500km above the surface of Earth. What is the velocity of the satellite in m/s?
1. 2 answers
2. 877 views
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.
1. 8 answers
2. 625 views
A lawn tractor tire turns at 65rpm and has a radius of 13cm. What is the linear speed of the tractor in m/s?
1. 2 answers
2. 636 views
I always thought I understood significant figures...until I attempted to tutor someone. Some of the rules seem counterintuitive.
1. 1 answer
2. 528 views
thank you for your help drwls
1. 1 answer
2. 388 views
One last question:If a 12lb. block is slowly tilted from horizontal when the plank reaches 30 degrees the block begins to slide.
1. 2 answers
2. 1,099 views
3.A force of 26lbs. causes impending motion. If the force is maintained at 26lbs.Fn=Fw=65lbs and the sliding friction is .28.fin
1. 1 answer
2. 488 views
2.A plank is tilted slowly to an angle of 30 degrees with a 12 pound block on itFind FN, FF and the static friction?
1. 1 answer
2. 414 views
1.If a block weighs 30 pounds and has a static friction of .7 and a sliding friction of .55 and Fn=Fwa. How much force must be
1. 1 answer
2. 546 views
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
1. 1 answer
2. 605 views
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
1. 4 answers
2. 486 views
I have a few questions.1.The coefficient of sliding friction between steel skate blades and ice is .05. How much force must be
1. 1 answer
2. 823 views
What do i do when i have a question that ask to compare the size and density of an atom with its nucleus.
1. 2 answers
2. 383 views
A piece of wood sinks in ethanol but floats in gasoline. Give a range of possible densities for the wood?
1. 8 answers
2. 3,106 views
The density of water is 1.0 g/mL. How many deciliters of water will fill a 0.5-L bottle?
1. 3 answers
2. 793 views
A shiny gold colored car of metal weighting 57.3g has a volumes of 4.7cm^3. Is the bar of metal pure gold?
1. 1 answer
2. 723 views
would the density of a person be the same on the surface of earth and on the surface of the moon? explain?
1. 1 answer
2. 470 views
Choose four number from one to five, with reprtitions allowed, to creat the largest standard deviation possible.
1. 1 answer
2. 409 views
Why was Churchill concerned about Soviet influence and control from Moscow?http://www.loc.gov/exhibits/churchill/wc-coldwar.html
1. 0 answers
2. 522 views
What did Churchill mean when he said "iron curtain"?You need to start stating what YOU think the answers are for YOUR questions.
1. 0 answers
2. 630 views
What were the closest non-Communist European countries to the Soviet Union?Finland had a long history of trade and cordial
1. 0 answers
2. 668 views
Which countries separated the Soviet Union from Western Europe?The so-called Warsaw Pact countries. Use Google or anothe search
1. 0 answers
2. 532 views
During the cold war Era (1945-1990), the United states and the Soviet Union were reluctant to become involved in direct military
1. 0 answers
2. 1,046 views
>Blockade of Berlin>Operation of the Berlin Airlift >Organization of the Warsaw Pact >Construction of the Berlin Wall These
1. 0 answers
2. 666 views
An incandescent lamp is marked '120v,75W'a)what is the current in the lamp under normal condition of operation? b)How much does
1. 1 answer
2. 701 views
Bob, please confirm if I got this right and if not, please help to solve1)A wire has a resistance of 10 ohm at 20 deg celsius
1. 0 answers
2. 1,031 views
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
1. 0 answers
2. 1,000 views
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
1. 1 answer
2. 938 views

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