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Charles
Questions and answers by visitors named
Charles
Questions (249)
Suppose that $n$ is a positive integer such that in base $7$, then $n$ can be expressed as $\overline{ABC}_7$, and in base $11$,
7 answers
2,802 views
Let $A$ and $B$ be real numbers such that
$\frac{A}{x-5}+B(x+1)=\frac{-3x^2+12x+22}{x-5}$. What is $A+B$?
5 answers
2,991 views
A cone is exactly half full of water by volume.How deep is the water in the cone? With diameter 12cm and height 16cm.(Applying
6 answers
658 views
How do you prepare 17.2cm³ of 36% conc HCL per dm³ of solution?
3 answers
582 views
1. If the writer had attended an elementary school dance , which of the following might she have done ? A. made fun of everyone
5 answers
670 views
For some constants $a$ and $b,$ let \[f(x) = \left\{
\begin{array}{cl} 9 - 2x & \text{if } x \le 3, \\ ax + b & \text{if } x > 3.
7 answers
5,079 views
What is the minimum value of $y$ if $y=3x^2+6x+9?$
5 answers
2,048 views
Differentiate lmplicitly x^2y^2-3xy+4xy^3=4
4 answers
1,351 views
Laser Pointers emit light waves whose wavelength is 670 nm. What is the frequency for this light?
4 answers
3,032 views
A baseball player leads off the game and hits a long home run. The ball leaves the bat
at an angle of 30.0o from the horizontal
6 answers
11,908 views
Find the sum of vectors A=5m<60degree and B=6m<130degree
7 answers
3,461 views
If D=7i-3j+2k and E=4i+5j-3k. Find the scalar product of D.E
4 answers
1,308 views
an effort of 250N is applied to a pulley system consisting of two fixed and two movable pulleys to lift a load to a height of
5 answers
657 views
You are a 70 kg astronaut floating at rest in zero gravity holding your laptop. Your hard drive turns on (increasing from 0 to
4 answers
465 views
A body of mass 20kg falls from rest through a height of 10m and comes to rest having penerated a distance of 9.8m into sandy
3 answers
407 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
2 answers
861 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 answer
924 views
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
1 answer
958 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
2 answers
611 views
>Blockade of Berlin
>Operation of the Berlin Airlift >Organization of the Warsaw Pact >Construction of the Berlin Wall These
1 answer
594 views
During the cold war Era (1945-1990), the United states and the Soviet Union were reluctant to become involved in direct military
1 answer
965 views
Which countries separated the Soviet Union from Western Europe?
The so-called Warsaw Pact countries. Use Google or anothe search
1 answer
451 views
What were the closest non-Communist European countries to the Soviet Union?
Finland had a long history of trade and cordial
1 answer
586 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 answer
567 views
Why was Churchill concerned about Soviet influence and control from Moscow?
http://www.loc.gov/exhibits/churchill/wc-coldwar.html
1 answer
470 views
Choose four number from one to five, with reprtitions allowed, to creat the largest standard deviation possible.
1 answer
354 views
would the density of a person be the same on the surface of earth and on the surface of the moon? explain?
1 answer
415 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?
2 answers
665 views
The density of water is 1.0 g/mL. How many deciliters of water will fill a 0.5-L bottle?
4 answers
728 views
A piece of wood sinks in ethanol but floats in gasoline. Give a range of possible densities for the wood?
9 answers
3,003 views
What do i do when i have a question that ask to compare the size and density of an atom with its nucleus.
3 answers
336 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
3 answers
734 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
5 answers
413 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
2 answers
526 views
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
2 answers
486 views
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?
1 answer
358 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 answer
418 views
One last question:
If a 12lb. block is slowly tilted from horizontal when the plank reaches 30 degrees the block begins to slide.
3 answers
1,027 views
thank you for your help drwls
1 answer
343 views
I always thought I understood significant figures...until I attempted to tutor someone. Some of the rules seem counterintuitive.
1 answer
466 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?
3 answers
572 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.
9 answers
528 views
A satellite is in orbit 2500km above the surface of Earth. What is the velocity of the satellite in m/s?
3 answers
788 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
3 answers
392 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
3 answers
368 views
Find the attracting force between 2 people sitting .08 meters apart. One person has a mass of 62kg and the other 80kg.
1 answer
425 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
3 answers
610 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 answer
330 views
Find the gravitational force between the sun and the earth in newtons?
1 answer
404 views
Find the orbital velocity of a satellite orbiting 1800km above sea level in meters per second?
1 answer
405 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?
4 answers
1,119 views
A person with a mass of 85kg. How much in newtons do they weigh on the earth and the moon?
6 answers
4,417 views
How long would it take for a beam of light to travel around the earth in an ideal fiber-optic cable?
1 answer
467 views
An increase in the average kinetic energy of a sample of copper atoms occurs with an increase in
a- Concentration b- Pressure c-
4 answers
1,340 views
According to Solubility guidelines chemistry reference table, which of these salts is least soluble in water?
a- PbCl2 b- RbCl c-
2 answers
858 views
According to Solubility guidelines chemistry reference table, which of these salts is least soluble in water?
a- PbCl2 b- RbCl c-
4 answers
2,356 views
An increase in the average kinetic energy of a sample of copper atoms occurs with an increase in
a. concentration b. pressure c.
4 answers
2,074 views
Pls I need a simple access control program written in either basic or fortran programming language.
1 answer
396 views
With a carrier voltage of 80Vp-p and
%m at 100 what is Vm,Vmax,Vmin,Vusb,Vlsb
1 answer
380 views
If Vmax is 18V and Vmin is 6V what is
%m,Vc,Vm,Vusb,Vlsb
1 answer
427 views
If Vmax is 18V and Vmin is 6V what is
%m,Vc,Vm,Vusb,Vlsb
1 answer
412 views
With a carrier voltage of 80Vp-p and
%m at 100 what is Vm,Vmax,Vmin,Vusb,Vlsb
2 answers
513 views
How is 2cos(4x) the derivative of f(x)=sin(2x)cos(2x)?
4 answers
793 views
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.)
3 answers
1,926 views
What does sec^2(-2) equal? Can you explain why?
3 answers
300 views
If the frequency of the crystal oscillator is 20 MHz on a PIC16F877a, the frequency of the signal on OSC1/CLKIN would be?
1 answer
337 views
If the frequency of the crystal oscillator is 20 MHz on a PIC16F877a, the frequency of the signal on OSC1/CLKOUT would be?
1 answer
331 views
If the frequency of an RC oscillator connected to CLKIN is 96 KHz on A PIC 16F877a, the frequency on CLKOUT would be?
1 answer
322 views
Which analysis of variance should be applied when an experiment has more than one independent variable.
What are the assumptions
1 answer
510 views
Irene has experienced physical problems because her life has been disrupted by environment changes and constraints. She
1 answer
451 views
John was recently diagnosed with dissociative amnesia. His family and friends have asked to be involved in his treatment. What
1 answer
1,072 views
John was recently diagnosed with dissociative amnesia. His family and friends have asked to be involved in his treatment. What
1 answer
432 views
Irene has experienced physical problems because her life has been disrupted by environment changes and constraints. She
1 answer
491 views
Hello im kinda new here and hoping someone can help me with this energy conservation question (I believe).
A 2.10g- bullet embeds
3 answers
480 views
A firm's cost of financing is equal to its: WACC, required yield that investors seek for various kinds of securities, required
1 answer
505 views
A) The total market for high density TV’s is estimated to be 600,000 units. Product development and marketing costs for market
2 answers
551 views
Explain why fixed and variable costs per unit decline as sales volume increases. Suppose a company had a variable cost/unit of
2 answers
802 views
A)Explain why the return on investment in advertising diminishes as more is invested in advertising.
I understand that ROI= (Gain
1 answer
487 views
Does anyone know prealgebra so i can ask a question????????????????????????????????????? PLEASE
3 answers
341 views
A) Explain why the return on investment diminishes as more is invested in advertising.
I understand that ROI= (Gain from
1 answer
813 views
D) Explain why distribution frequenly purchased goods like Mars bars requires longer distribution channel with more
1 answer
358 views
D)Assume that you have $100,000 extra to spend on promotion of consumer product. On what basis would you decide whatever to
1 answer
1,040 views
From a single deck of cards, you select a card, look at it, put it back in the deck and shuffle. If you do this 10 times, what
1 answer
354 views
From a single deck of cards, you select a card, look at it, put it back in the deck and shuffle. If you do this 10 times, what
1 answer
382 views
From a single deck of cards, you select a card, look at it, put it back in the deck and shuffle. If you do this 10 times, what
1 answer
477 views
Show that for all three distributions (Binomial, Poisson and Geometric) the probability of finding at least one ace is around
1 answer
367 views
a student claims that if a fair coin is tossed and comes up heads 5 times in a row, then according to the law of averages the
4 answers
2,433 views
Do students at various universities differ in how sociable they are? Twenty-five
students were randomly selected from each of
2 answers
517 views
The most useful indicator of the degree of democracy reached by a particular society is whether it has a what?
1 answer
343 views
Some properties of aluminum are summarized in the following list.
normal melting point 658°C heat of fusion 0.395 kJ/g normal
5 answers
783 views
Why did it take until 1932 for Saudi Arabia to obtain its independence?
1 answer
344 views
week9 Romans, Islamic, and Indian civilization. wHAT is the purpose of the piece, who's responsible for paying for the piece,how
2 answers
534 views
points that all lie in one place?
1 answer
288 views
I have described normative and legal definitions of crime but how is each for applied?
1 answer
390 views
A laser emitting light with a wavelength of 480 nm is directed toward the surface of rubidium metal. The work function for
2 answers
698 views
Suppose that two different tests A and B are to be given to a student chosen at random from a certain population. Suppose also
2 answers
890 views
Describe in each case what you could add to the following aqueous solutions in order to separate one or more cations or anions
1 answer
406 views
A surveillance satellite circles the earth at a hight of h miles above the surface. Suppose that d is the distance, in miles, on
3 answers
1,178 views
what is the concentration hcl react with zn
1 answer
296 views
What is the volume of a spherical dome with radius 5.5ft and height 3.5ft?
3 answers
419 views
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