Saturday
February 13, 2016

Posts by Charlie

Total # Posts: 439

Algebra
Thanx...Ms. Sue... I just wanted to know.
July 26, 2011

Algebra
How did you get the second one with 1/4?
July 26, 2011

statistics
A population of 200 voters contains 52 Republicans, 128 Democrats, and 20 independents and members of other parties. A simple random sample of 20 voters will be drawn from this population. The expected number of Republicans in the sample is? and The standard error of the ...
July 26, 2011

chemistry
iF 50.0 g of iron (II) carbonate react completely with hydrochloric acid, how many grams of carbon dioxide gas may be produced?
July 3, 2011

Chemistry
Give the following reaction,find the mass of oxygen required to produce 13grams of CO2; C3H8+5O2--->3CO2 + 4H2O
June 15, 2011

Math
What percentage of the data falls outside 1 standard deviation of the mean?
June 7, 2011

Algerbra 1
A(1,4), (6,8) Round to the nearest tenth
May 24, 2011

chemistry
in the reaction 2Na + Cl2 --> 2NaCl how many grams of NaCl are produced when 25 g. of sodium reacts completely to form NaCl?
May 17, 2011

chemistry
I have two solutions of 0.1 Molar. A solution of magnesium chloride and a solution of potassium chloride. I thought that the 0.1 M solution of magnesium chloride would conduct electricity better than a 0.1 M solution of potassium chloride. I did a lab in my chemistry class but...
May 11, 2011

Social Studies
Mandate of Heaven
April 25, 2011

Social Studies
What are the 5 things that every business needs to succeed?
April 3, 2011

statistics
Three students take equivalent stress tests. Which is the highest relative score? a. A score of 144 on a test with a mean of 128 and a standard deviation of 34. b. A score of 90 on a test with a mean of 86 and a standard deviation of 18. c. A score of 18 on a test with a mean ...
April 3, 2011

statistics
Three students take equivalent stress tests. Which is the highest relative score? a. A score of 144 on a test with a mean of 128 and a standard deviation of 34. b. A score of 90 on a test with a mean of 86 and a standard deviation of 18. c. A score of 18 on a test with a mean ...
April 3, 2011

physics
1.when white light is shone on red ink dried on a glass plate, the color that is transmitted is red. But the color that is reflected is not red. what is it? 2.a spotlight is coated so that it won't transmit blue from its white hot filament. what color is the emerging beam ...
March 31, 2011

physics
1.calculate th speed of waves in water that are 0.4m apart and have a frequency of 2hz? 2. sound waves travel at approximately 340m/s what is the wavelength of a sound with a frequency of 20Hz? what is the wavelength of a sound with a frequency of 20 kHz? 3.a bat flying in a ...
March 31, 2011

Chemistry
You mix 1.00 L of 2.00 M BaCl2 with 1.00 L of 2.00 M AgNO3. What compounds remain in solution, and what are their concentrations?
March 29, 2011

algebra
how do you solve for y in the equation -1/y=-0.25x^2-3.5
March 22, 2011

algebra
how do you solve for y in the equation 1/y=(1/3)x^3-(253/12)
March 22, 2011

algebra
how do you solve for y in the equation 1/y=-0.5x^(-2)-0.5
March 22, 2011

Traveling(saving money)
the cheapest pleese does it depend on when your going if so then for india in dec. and for england then july
February 23, 2011

Traveling(saving money)
how much are plane tickets to: india england
February 23, 2011

physics
so does the ball clear by 1 m or does the ball not clear the crossbar and misses it by 1 m.
February 22, 2011

physics
trying to win the superbowl, a placekicker attempts a field goal from 45 m away. when kicked, the ball leaves the ground with a speed of 22m/s at an angle of 50 degrees above the horizontal. what can you say about the ball when it reaches the crossbar that is 3.0m above the ...
February 22, 2011

physics
sorry that was 188 that i got
February 22, 2011

math
How do i find the extrema (local maximum and minimum) by using the first derivative of: x^3-(3/2)x^2?
February 16, 2011

physics
while watching ocean waves at the dock of the bay. otis notices that 10 waves pass beneath him in 30 seconds. he also notices that the crests of succesive waves exactly coincide with the posts that are 5 meters apart. what are the period frequency wavelength and speed of the ...
February 11, 2011

physics
the lowest frequency we can hear is about 20hz. calculate the wavelength associated with this frequency for sound that travels at 340m/s. how long is this in feet.
February 11, 2011

physics
calculate the speed of waves in a puddle that are 0.15m apart and made by tapping the water surface twice each second
February 11, 2011

physics
a nurse counts 76 beats in one minute. what are the period and frequency of the hearts oscillations?
February 11, 2011

math
In gift wrapping department, a customer can choose from x different papers, y different ribbons, and z different greeting cards. There are 160 different paper, ribbon, and greeting card combinations possible. List three of the possible combinations. What forumula are used? Don...
February 2, 2011

math
write the 100-complement of 40
January 20, 2011

chemistry
Lewis diagram for NO3- and NH4+
January 10, 2011

physics
calculate the period of a pendulum if the length of the pendulum is o.8m. what is the period if the angular deflection is 30 degrees? 45 degrees?
January 8, 2011

physics
calculate the amount of heat energy required to raise the temperature of a 5kg block of solid platinum from 0 degrees celsius to 25 degrees celsius. the specific heat of platinum is 133j/kg k. how much heat energy is required to raise 5kg of water by the same amount? the ...
January 8, 2011

9th grade science
A landslide may be caused when friction is ______ by moisture
January 4, 2011

9th grade science
A landslide may be caused when friction is ______ by moisture
December 16, 2010

AP Physics
A cylindrical container of radius 20 cm contains water of height of 3 m. Two meters down from the water level there is a hole of 0.5 cm in radius. Find the velocity and volume flow rate of water leaving the hole. Where does it strike the ground?
November 29, 2010

math
need help please. thanks evaluate and simplify. (8x/y) for x=10 and y=2
November 14, 2010

math
Tell which real number corresponds to the situation: During a month, a person withdraws $350. what is the corresponding # for this sentence?
November 14, 2010

science-6th grade
what is between the helium particles in a helium filled balloon?
November 5, 2010

College Physics
A mass of 0.4 kg, hanging from a spring with a spring constant of 80 N/m, is set into an up-and-down simple harmonic motion. What is the velocity of the mass when at its maximum displacement of 0.1 m?
October 24, 2010

College Physics
A multiple loop configuration is rotating at 60 Hz in a magnetic field of 0.12 T. The coil has an area of 0.0052 m2. How many coil loops are required to produce a maximum voltage difference of 170 V?
October 24, 2010

Chemistry
I conducted a simple titration experiment and i need to write how and why are the results reproducible can some one hlp me in answering this. Thankyou C.
October 17, 2010

Science
I have my results from a simple titration experiment (sodium carbonate against hydrochloric acid) Average titre of 53.27 cm3 which i am happy with but how can i reason that my results are accurate?
October 15, 2010

Periodic Table
Hello all, how does the periodic table determine the type of bonding of compounds Cheers Charlie.
October 13, 2010

Science (Bonding)
thankyou, srajmcgin
October 13, 2010

Physics, relativity
Thanks Drwls, but that's the press release I spotted the error in. I think!
October 11, 2010

Physics, relativity
I read this in a write-up of an experiment using atomic clocks: To reveal these effects, required the use of highly accurate atomic clocks, calibrated to check that they are perfectly in sync with each other – ticking down the nanoseconds (that's one billionth of a ...
October 11, 2010

college chemistry
whats is the boiling point of a solution composed of 17.6g of urea in (NH2)2CO in .300 kg of water
October 4, 2010

physics
the passenger's weight is ALWAYS mass x acceleration. Can you work out the acceleration at all 3 stages? The mass of the person is the same for all 3.
September 28, 2010

11th grade
Suppose you surveyed 50 students and 34 said that they approve of how the president is doing. Construct 90%, 95%, and 99% confidence intervals for the true proportion of students in your school who approve of how the president is doing. Be sure to specifically calculate the ...
September 12, 2010

college physics
A box on a frictionless horizontal surface is pulled by a tension of 42.4N directed at 45 degrees above the horizontal. what is the work done on the box as it moves 2.50 meters along the surface?
September 11, 2010

college physics
A box on a frictionless surface is pulled back a distance x into a spring with spring constant k and released. What is the formula for the kinetic energy of the box after it leaves the spring?
September 11, 2010

College Physics
A 50 kg skater moving at 5 m/s over frictionless ice grabs a rope stretched out 10m from a post and perpendicular to her path. She then moves in circles, spiraling inward as the rope wraps around the post. How fast is she moving when she is 2 meters from the post?
September 11, 2010

8th grade Math
3p - 1.5
September 9, 2010

math
let me retype the question. Sorry for the scribble. 1/2 X 1/2 answer in simplest form. must show work. thanks
August 29, 2010

math
desperately seeking help. work must be shown. answer must be in simplest form. Thanks 1 1 _ X _ 2 2
August 29, 2010

mat115
There are multiple choices for the answer to this problem. They are a) 1/5 b) undefined c) 5 d) 5/7 Thanks again for both of your help
August 29, 2010

mat115
Sorry Reiny, The question is 11-6/7-7 I thought the answer was 5/0= undefined. Can you please let me know if I am wrong and show the work so I can further understand your answer. Thanks Reiny
August 29, 2010

Math
Thanks Reiny, Yes, I spotted that it dosen't work for any run of primes, but it does up to 9. I'm afraid i don't really follow your explanation! An answer for dummies maybe? Charlie
July 30, 2010

Math
I have to find the relationship between these sequences, and express a generality. Could you help please. 1 + 3 + 5 + 3 + 1 = 3^2 + 2^2 1 + 3 + 5 + 7 + 9 + 7 + 5+ 3 + 1 = 5^2 + 4^2 1 + 3 + 1 = 2^2 + 1^2 I'm thinking sum of consecutive primes can be expressed in squares? ...
July 30, 2010

Physics
It's too hard. You should give up now
July 6, 2010

gen.science
A compound containing 3 atoms of carbon and 8 atoms of hydrogen is combined in a reaction with oxygen molecules. The two end products of this equation are carbon dioxide and water. Which chemical or element will have the largest number of moecules?
June 21, 2010

chemistry
What was the purpose of the phenolphthalein?
June 1, 2010

Math algebra
I'm reposting this, because Mathmate's answer hasn't directed me to the WHY? part of the question. Any prompts appreciated. The product of any two (whole) numbers each of which leave a remainder of 1 on dividing by 7, also leaves a remainder of 1 on dividing by 7...
May 3, 2010

math
I have this question to work on, and I don't know where to start investigating the answer: The product of any two (whole) numbers each of which leave a remainder of 1 on dividing by 7, also leaves a remainder of 1 on dividing by 7. Why? I THINK that I can see a quadratic ...
May 2, 2010

physics
If the angular quantities θ,ω,α were specified in terms of degrees rather than radians, how would the kinematics equations for uniformly accelerated rotational motion have to be altered?
April 11, 2010

Physics
Ok thanks, but why isn't this true for an arm or leg?
February 3, 2010

Physics
Why is the CM of a 1.00m length of pipe at its midpoint, whereas this is not true for your arm or leg?
February 3, 2010

Math
I need to figure out what a deposit of 3500 a month, with 9 percent intrest compounded monthly, would be in 6 years. Any help would be greatly appreciated.
January 13, 2010

Math
I need to figure out what a deposit of 3500 a month, with 9 percent intrest compounded monthly, would be in 6 years. Any help would be greatly appreciated.
January 13, 2010

math
-3/4
January 13, 2010

freedom
iiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiissssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssss WAR.
January 11, 2010

Biology
What differences would you expect to see in a population made up of individuals whose chromosomes experience crossing-over frequently compared with a population made up of individuals whose chromosomes do not cross over?
January 6, 2010

algebra
x+12+x-5+x=40 3x+7=40 3x=33 x=11 x-5+6 x+12=23 23, 11, 6
December 16, 2009

AP Physics B
can u give me these in numbers please, i dont understand what formulas u wrote and what some of the stuff in ur formulas are
December 16, 2009

AP Physics B
i figured out the amplitude and the period, i just dont kno how to get to the other 4 with using simple harmonic motion equations
December 16, 2009

AP Physics B
The position of a 20 g oscillating mass is given by x(t) = (2.0 cm) cos(2t), where t is in seconds. Determine the following. The Amplitude (cm.) The Period (s.) The Spring Constant (N/m) The maximum speed (cm/s) The total energy (J) The velocity at t=0.40 s. (cm/s) I need your...
December 16, 2009

Chemistry
The titration of 25.0 mL of an unknown concentration H2SO4 solution requires 83.6 mL of 0.12 M LiOH solution. What is the concentration of the H2SO4 solution (in M)? A) 0.40 M B) 0.10 M C) 0.20 M D) 0.25 M E) 0.36 M The answer is supposedly C, but I got A. What am I doing ...
December 8, 2009

Chemistry
Uranium-235 can be separated from U-238 by fluorinating the uranium to form UF6 (which is a gas) and then taking advantage of the different rates of effusion and diffusion for compounds containing the two isotopes. Calculate the ratio of effusion rates for 238UF6 and 235UF6 ...
December 7, 2009

Chemistry
Thanks so much! I got 4.82 which seems to be correct. Thank you again
December 7, 2009

Chemistry
Consider the following reaction: 2NiO (s)--> 2Ni(s) + 2O2 (g) If O2 is collected over water at 40.0 C and a total pressure of 752 mmHg, what volume of gas will be collected for the complete reaction of 25.67 g of NiO? I am struggling to set up this problem. Can anyone help ...
December 7, 2009

Physical Science
What is cracking and reforming? For what purposes are either or both used by the petroleum industry
September 29, 2009

Physics
I'm not doing the measuring, it's a graphing exercise, and I've been given the table of data. I was looking for confirmation of my choice of axes. But your extra points are well taken. Thanks for your comment.
August 10, 2009

Physics
I have to plot a graph of Pressure gradient vs average velocity (water in a pipe, I have all the data). I plan to put the average velocity on the x axis, since I could control that better in an experiment. Do you agree/ Thanks. Charlie
August 10, 2009

english (help please)
help
August 2, 2009

english
this is the quesion List four things to look for when you’re proofreading?
August 2, 2009

english
If you’re asked to list for things can the way of your listing be vertical or horizon.
August 2, 2009

Physics
Would someone check this please? A circular loop of wire of radius 0.10 m and of resistance 2.0 x 10^−3 ohms is in a region where there is a uniform magnetic field B. The field is at 30deg to the normal to the plane of the wire loop as shown in Figure 3. The magnitude of...
June 20, 2009

physics
The last stage in the fusion of hydrogen to form helium in the Sun involves the formation of an alpha particle (4He) from two 3He nuclei: 3He + 3He 4He + p + p The binding energy for 3He is 2.57 MeV per nucleon and that for 4He is 7.07 MeV per nucleon. Calculate the amount of ...
June 19, 2009

Physics
Would someone check this please? A circular loop of wire of radius 0.10 m and of resistance 2.0 x 10^−3 ohms is in a region where there is a uniform magnetic field B. The field is at 30deg to the normal to the plane of the wire loop as shown in Figure 3. The magnitude of...
June 19, 2009

Physics
The last stage in the fusion of hydrogen to form helium in the Sun involves the formation of an ƒ¿-particle (4He) from two 3He nuclei: 3He + 3He ¨ 4He + p + p The binding energy for 3He is 2.57 MeV per nucleon and that for 4He is 7.07 MeV per nucleon. ...
June 18, 2009

Physics
Would someone check this please? A circular loop of wire of radius 0.10 m and of resistance 2.0 ~ 10−3 ƒ¶ is in a region where there is a uniform magnetic field B. The field is at 30‹ to the normal to the plane of the wire loop as shown in ...
June 18, 2009

Physics
In an elastic collision: mass a is 1kg, and is moving at 100ms^1 in the +ve x direction when it hits mass b, 10kgs at rest. Given: mass a moves off at 80 ms^1 in the -ve x direction. What's the final velocity of mass b. Using cons of momentum, i say 2 ms^1 in the +ve x ...
June 16, 2009

physics
Thanks for that. So it would take longer to stop then?
June 15, 2009

physics
Would someone check my thinking please. A solid sphere (mass, r, and moment of inertia given) is rotating at a given angular speed. Friction is constantly applied at the 'equator' of the sphere, and brings it to rest in 3s. Find the force. I worked out the torque, and ...
June 15, 2009

Physics/Maths
Thanks
June 11, 2009

Physics/Maths
Keplers third law I understand. T^2/a^3 of one planet = T^2/a^3 second planet. But I can't do the algebra to solve for the second planet's a^3 (semimajor axis) Would someone walk me through the steps please? Thanks.
June 11, 2009

Entropy
Thanks for that.
May 11, 2009

Entropy
If a sample of an ideal gas is heated at a constant volume, I believe its entropy will increase. Am I right? Thanks.
May 11, 2009

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