Monday
September 15, 2014

Posts by Alan


Total # Posts: 320

Physics
A small plane tows a glider at constant speed and altitude. If the plane does 2.00X10^5 J of work to tow the glider 165 m and the tension in the tow rope is 2660 N, what is the angle between the tow rope and the horizontal?
March 15, 2011

physics
A 55-kg packing crate is pulled with constant speed across a rough floor with a rope that is at an angle of 44.7 degrees above the horizontal. If the tension in the rope is 155 N, how much work is done on the crate to move it 9.0 m? *looking for W=__J
March 15, 2011

Physics
Early one October, you go to a pumpkin patch to select your Halloween pumpkin. You lift the 2.8 kg pumpkin to a height of 1.4 m, then carry it 50.0 m (on level ground) to the check-out stand. Calculate the work you do on the pumpkin as you lift it from the ground? and How much...
March 15, 2011

Physics
531684.027J
February 23, 2011

AP PHYSICS
In a Young's double-slit experiment, the angle that locates the second-order bright fringe is 3.0°. The slit separation is 4.8 10-5 m. What is the wavelength of the light?
February 16, 2011

Physics
At t=0, a wave disturbance has the waveform that is shown in a figure. The wave has a velocity of 500.0 m/s to the left. What's the values for k and ω if the wave equation is to be written in the form: y(x,t)=A cos(kx±ωt+φo). What is the value for k, ...
February 13, 2011

Physics
Thanks.
February 11, 2011

Physics
Two waves are combined to form this standing wave equation of y(x,t) = (3 mm)sin[x/(2 m]cos[(100 rad/s)t] a. What's the amplitude of the right moving wave and left moving wave? b. What's the wavelength of the right moving wave and left moving wave? c. What's the ...
February 11, 2011

AP Physics
At a height of 5 meters above the surface of a freshwater lake, a sound pulse is generated. The echo from the bottom of the lake returns to the point of origin 0.140 s later. The air and water temperatures are 20°C. How deep is the lake?
February 9, 2011

Science Physics
A rubber ball of mass m1= 10kg is moving to the right with speed v1= 10m/s. it collides elastically with another ball of mass m2= 50kg, which is sitting at rest. m2 is larger than m1, what are the speeds of the balls, v1 and v2 after the collision?
February 3, 2011

writing paper for political science
Ok then I will start at that point.
December 6, 2010

writing paper for political science
Since it only wants recent history I gather then I don't need to go back to far ago. So I should just stick to the most recent events? Or should I start with the korean war? Would it be wise to mention the Korean war briefly if it is important to the current events?
December 6, 2010

writing paper for political science
Thanks of the responses. I came up with the country in order to do on the conflict with North Korea. Yeah I could use a tip on researching what about the conflict I should focus on. I got a bit overwhelmed. and I also was lost on how to cite sources into a paper with footnotes...
December 6, 2010

writing paper for political science
Confused on what do to do for this paper I have to write for a class here in a community college. I am to choose a country in asia, africa or Latin America like say South Korea. I am to research recent history and contemporary situation. Identify and explain using factual ...
December 6, 2010

business
18. Which of the following is not a ramification of too much or too little status in an organization? a. it inhibits communication b. solidarity is not developed c. it interferes with work d. it causes resentment and conflict e. it causes communication underload
November 28, 2010

Chemical Engineering
I got the same answer
November 7, 2010

math
distance over time. 18/2=9 so is traverling at 9 feet per second multiply by the amount need to turn one second into an hour and u will have your answer.60 x 60 just a clue to help.
October 21, 2010

Astrology / Physics
The calculations/concepts here are actually physics.
September 20, 2010

Astrology / Physics
How do we calculate the radial velocity after the recession velocity is known?
September 20, 2010

Chemistry
Does methanol absorb UV light?
September 12, 2010

Chemistry
Does water and methanol absorb light in the UV-Vis region?
September 11, 2010

algebra
Find the function value. f(x)=x^3 f(-8)=
September 5, 2010

algebra
Given the function k described by k(x)=8x, find each of the following. k(-13)= k(6)= k(24)=
September 5, 2010

Chemistry
In the reaction: Protection of 1-Phenylethanol by 3,4-Dihydro-2H-pyran, 1-phenylethanol, 3,4-Dihydro-2H-pyran and anhydrous ether were added first and stirred in ice-water bath before acid catalyst p-toluenesulfonic acid monohydrate was added. The reaction was kept at 0 deg ...
September 4, 2010

Statistics
One of the tests for Outlier is anything greater or smaller than 1.5 IQR. Why is 1.5 chosen to be the benchmark, instead of 2 or 1 IQR?
August 31, 2010

Chemistry
An NMR spectrum of fumaric acid in acetone was run. The following results were obtained: 1 sharp peak with 5 splittings at around 2 ppm (belonging to acetone) 1 broad peak at 3.789 ppm (integration 0.63) 1 sharp peak at 6.779 ppm (integration 1.00) (belonging to CH of fumaric...
August 30, 2010

Chemistry
An NMR spectrum of fumaric acid in acetone was run. The following results were obtained: 1 sharp peak with 5 splittings at around 2 ppm (belonging to acetone) 1 broad peak at 3.789 ppm (integration 0.63) 1 sharp peak at 6.779 ppm (integration 1.00) (belonging to CH of fumaric ...
August 28, 2010

Chemistry
In general, what are the conditions required for Schiff's Base to polymerise?
August 21, 2010

Chemistry
Sorry. What I meant was: How do we improve the efficiency of Flash Column Chromatography?
August 19, 2010

Chemsitry
How do we improve the efficiency of Column Chromatography?
August 19, 2010

Pyschology
the determining factors of gender identification and gender roles o State the factors that determine gender identity. o Explain how a person’s masculine and feminine traits can be described using the continuum of masculinity-femininity
May 31, 2010

Biochemistry
Is ATP an allosteric inhibitor for protease?
April 2, 2010

Biology / Biochemistry
How will the conformation of an Enzyme (a protease) be affected when the amino acid residue is substituted with glutamate instead of glutamine?
March 28, 2010

Chemistry
Beside the usual method of titrating with KMNO4, what is/are the alternative method/s to test for the presence/amount of oxalate in a compound?
March 23, 2010

math
-8<3x-5<-4 -8<3x-5 and 3x-5<-4 3x-5>-8 3x<1 3x>-3 x<1/3 x>-1 therefore 1/3>x>-1
March 23, 2010

Chemistry
Is Al(OH)3 soluble in KOH or K2C2O4•3H2O?
March 23, 2010

Math 30
Yes, 2^9.
March 22, 2010

Chemistry
Why is heating required for this formation: 6NaOH (aq) + Al2(SO4)3 (aq) ¨ 2Al(OH)3 (s) + 3Na2SO4 (aq)? Wouldn't freezing favour the formation of Al(OH)3 since freezing lower the KSP and more Al(OH)3 would precipitate?
March 22, 2010

Chemistry
This is the equation for the formation of Al(OH)3: 6NaOH (aq) + Al2(SO4)3 (aq) ¨ 2Al(OH)3 (s) + 3Na2SO4 (aq) Would any side products be formed if NaOH was added quickly into Al2(SO4)3?
March 22, 2010

Chemistry
During the preparation of K3[Al(C2O4)3].3H2O, NaOH was added slowly and with stirring over an approximately 10-minute period to a solution of Al2(SO4)3 solution. The combined solution was heated to almost boiling and left to stand for a few minutes. 1. Why does NaOH added ...
March 22, 2010

math
I calculated the average number of crashes over a 240 week period to be .0875... what formula do I use to calculate the probability that at least 19 crashes would occur over that 240 week period?
March 16, 2010

Physics
A room has a volume of 120 m^3. An air-conditioning system is used to replace the air in the room every twenty minutes, using ducts that have a square cross ection. Assuming that air can be treated as an incompressible fluid, calculate the length of a side of the square if the...
March 16, 2010

Chemistry
Cu(NH3)2^+ is a colourless compound. Will there be any absorbance at 600nm?
March 16, 2010

math
h(x) = 1.95 x + 72.85 h(x) = 1.95(35) + 72.85 h(x) = 141.10
March 16, 2010

apchem
For a typical commercial vinegar with a 5% acetic acid content, the density is about 1.01 grams per milliliter.
March 16, 2010

apche,m
For a typical commercial vinegar with a 5% acetic acid content, the density is about 1.01 grams per milliliter.
March 16, 2010

spelling
The plural of family is families. So the first sentence is right.
March 16, 2010

Chemistry
What is the colour of: 1. Cu+ 2. Cu2+ 3. Cu3+?
March 16, 2010

Chemistry
Aspirin equilibrium is : HC9H7O4(aq) + H2O (double arrow)C9H7O4^-(aq) + H3O^+ You have 2 tablets each containing 0.325g of active ingredient that you dissolve in water up to 225ml. Calculate the pH.
March 14, 2010

Math
x + 2y =1 --- (1) 8x + 8y =4 --- (2) From (1), x + 2y = 1 x = 1 - 2y --- (3) Sub (3) into (2), 8 (1-2y) + 8y = 4 8 - 16y + 8y = 4 -8y = 4 - 8 -8y = -4 y = -0.5 sub y = -0.5 into (3), x = 1 - 2(-0.5) x = 1 + 1 x = 2 CHECK: sub x = 2 and y = -0.5 into (1), 2 + 2(-0.5) = 1
March 14, 2010

math
-6x + 3 =-7 - 5x -6x + 5x = -7 - 3 -x = -10 x = 10
March 13, 2010

Physics
energy of 1 photon = (Plank constant x speed of light, c) / wavelength = 6.626 x 10^-34 x 2.998 x 10^8 / 2 x 10^-1 = 9.93 x 10^-25 J energy of 10^12 photons = 9.93 x 10^-25 x 10^12 = 9.93 x 10^-13 J
March 13, 2010

Chemistry
What is the stoichiometric ratio for Cu2+ ions with cuprizone to form the copper-cuprizone complex?
March 13, 2010

math
average of: 8; 10; 12; 14; 16 = (8 + 10 + 12 + 14 + 16) / 5 = 60 / 5 = 12
March 13, 2010

math
x+8y=33 ---- (1) -x+4y=3 ---- (2) (1) + (2), x + 8y + (-x + 4y) = 33 + 3 12y = 36 y = 3 sub y = 3 into (2), -x + 4(3) = 3 -x = 3 - 12 -x = -9 x = 9 CHECK: sub x = 9 and y = 3 into (1), 9 + 8(3) = 33
March 13, 2010

math
6m+n=47 --- (1) m-4n=12 --- (2) From (2), m = 12 + 4n --- (3) sub (3) into (1), 6(12 + 4n) + n = 47 72 + 24n + n = 47 25n = -25 n = -1 sub n = -1 into (3), m = 12 + 4(-1) m = 8 CHECK: sub m = 8 and n = -1 into (2), 8 - 4(-1) = 12
March 13, 2010

Chemistry
Copper(I) Iodide is synthesised by the equation: 2CuSO4.5H2O + 2KI + 2Na2S2O3.5H2O --> 2CuI + K2SO4 + Na2SO4 + Na2S4O6 + 10H2O Would it make a difference if anhydrous CuSO4 and Na2S2O3 are used instead? Why hydrous CuSO4 and Na2S2O3 are used instead?
March 13, 2010

Chemistry
What is the stoichiometric ratio for Cu2+ ions with cuprizone to form the copper-cuprizone complex?
March 13, 2010

Chemistry
How should I write the balanced chemical equation to represent the oxidation of Cu+ ion by air? [Cu(NH3)3]^+1 + 2H2O + ??? --> [Cu(NH3)3(H2O)2]^+2
March 13, 2010

Chemistry
Can [Cu(NH3)2]^+ and/or [Cu(NH3)3]^+ be oxidised by air to become [Cu(NH3)2]^2+ and [Cu(NH3)3]^2+ respectively?
March 13, 2010

Chemistry
What would be the most likely product(s) when you react CuI with NH4OH?
March 13, 2010

Chemistry
What is the chemical equation for: CuI + NH4OH ---> ??? This equation should oxidise Cu+ to Cu2+.
March 13, 2010

Physics Tough question!
o wow, i didnt even think of the geometrical way, thanks.
March 8, 2010

Physics Tough question!
A pond has the shape of an ice cream cone with the tip slices off and has a depth of 5.00m. The atmospheric pressure above the pond is 1.01 *10^5 Pa. The circular top surface (radius = R2) and circular bottum (radis = R1) of the pond are both parrallel to the ground. The angle...
March 8, 2010

Physics
Also, teacher gave me a hint that "r(radius)" was suppose to cancel during the formula manipulation process..
March 3, 2010

Physics
A hypothetical spherical planet consists entirely of iron (p=7860 kg/m^3). Calclate the period of a satellite that orbits just above its surface. I started out with the density formula P=M/V, but i kept subbing in other formulas, but i get stuck..can someone help me? thanks. I...
March 3, 2010

Physics, help please!
Im sorry! I meant density! It was represented by a small p, so i thought pressure >_< Anyways, density = mass/volumne. My teacher gave me a hint about radius cancelling each other off in the formula manipulation. Hope this helps!
March 2, 2010

Physics, help please!
A hypothetical spherical planet consists entirely of iron (p=7860 kg/m^3). Calclate the period of a satellite that orbits just above its surface. I started out with the pressure formula P=M/V, but i kept subbing in other formulas, but i get stuck..can someone help me? thanks.
March 2, 2010

Physics
A hypothetical spherical planet consists entirely of iron (p=7860 kg/m^3). Calclate the period of a satellite that orbits just above its surface. I started out with the pressure formula P=M/V, but i kept subbing in other formulas, but i get stuck..can someone help me? thanks.
March 2, 2010

Physics
Thanks
February 16, 2010

Physics
A 3.00 uF and a 5.00 uF capacitor are connected in series cross a 30.0V battery. A 7.00 uF capacitor is then connected in parallel across the 3.00 uF capacitor. a)Calculate the equivalent capacitance of the circuit I think the answer is 3.33 uF. b)Determine the voltage across ...
February 16, 2010

Chemistry
What are the possible side reactions for this case?
February 12, 2010

Chemistry
I recently did an experiment on Aldol Condensation, by reacting Benzaldehyde with Acetone to form Dibenzalacetone. The proposed stoichiometric ratio of Benzaldehyde:Acetone is 2:1. What would be the implications if either of the reactants is in excess?
February 12, 2010

Phyics
Thanks a lot!
February 10, 2010

Phyics
A resistor has a resistance R, and a battery has an internal resistance r. When the resistor is connected across the battery, ten percent less power is dissipated in R than would be dissipated if the battery had no internal resistance. Show that the ratio r/R is equal to 0.054...
February 10, 2010

Geometry
What is the sum of the measures of the interior angles of a convex octagon? What is the sum of the measures of the interior angles of a convex decagon? What is the measure of one interior angle of a regular polygon with 20 sides? Thank You! (:
February 3, 2010

math
Isolate x or y in either equation and then subsitute it in to the other equation. x+y=56 x=56-y Subsitute into the other equation: Since x=56-y, the other equation becomes (56-y)+3y=56 56+2y=56 subtract 56 from both sides 2y=0 y=0/2 y=0 then x must be 56
January 21, 2010

physics
It decreases very very slightly. Mabye from 9.81m/s^2 to 9.80m/s^2, MABYE. Depending on how far you travel away from Earth, the force due to gravity is decreases exponentially. This can be proven with Fg=Gm1m2/r^2 where G=Gravitational constant(6.67*10^-11 N*m^2/kg^2)
January 21, 2010

Math
Ooo right, my teacher mentioned that, guessed it slipped my mind. Thanks a lot. Diploma tomorrow :(
January 21, 2010

Math
Log(base a)(a^4*b)-Log(base a)(a*b) is the same as a)4 b)3 c)3a d)a^3 I got the answer as d since subtracting logs with the same base is division. However, the answer key saids its b, Can someone please help me with this?
January 21, 2010

math
5 divided by 3, gives you 1.6666666666667 gallons of punch per bowl. In fraction form, it would 5/3 gallons per bowl.
January 21, 2010

Chemistry
Calculate the volume occupied by 18g of water vapor at 100C at 1 atm. Show calculations
December 12, 2009

algebra
well, i didnt think of that, if thats the case, v=(-1/3)t+4 Sub in t=6 v=(-1/3)(6)+4 v=(-6/3)+4 v=-2+4 v=2 Hope you read this before you sleep =\
December 7, 2009

algebra
Sub in t=6 into the formula v=-1/3t+4 v=-1/3(6)+4 v=-1/18+4 v=-1/18+72/18 (4 is the same as 4/1 and when multiplied by 18, 72/18) v=71/18
December 7, 2009

Science
B) Fault block mountains Happens when two plates collide, and force the rock up.
December 7, 2009

algebra
if you rearrange the question it becomes y=8x-8 Using y=mx+b, with m as your slope, your slope is 8
December 7, 2009

Physics
huh....
December 7, 2009

Physics
I typed exactly what is said on the question sheet. Answer given is 5.47*10^15 photons/s As each photon strikes the electron, it is absorbed and then any excess energy is then re-radiated in the form of x-rays, from what i understand, i need to find the remaining energy (since...
December 7, 2009

Physics
A cathode ray tube operates at 80 kV with a current of 875 uA. Calculate the a)Intesity (# of photons per second f the x-rays b)Minimum wavelength of the x-rays produced by the CRT thanks in advance
December 7, 2009

Physical Science
W=FD W=(400N)(3.0m) W=1200N I dont really get the 1250N car thing. Unless you also need friction, but i need the coefficent for that.
December 7, 2009

Algebra
Using the point slope formula m=(y2-y1)/(x2-x1) m=([1/2]-[1/2])/([-5]-[-9]) m=0/4 m=0 In other words, this is a horizontel line, with a slope of 0 m=rise/run
December 7, 2009

Physics
Yes, if the particle is not in motion, it will not experience a magnetic force (faraday's law) Yes to 2 too, using the third hand rule, fingers pointing in the direction magnetic field (north to south), thumb pointing in the direction of particle movement(in this case ...
December 7, 2009

Science
a)
December 7, 2009

Physics
Information you have: m=23kg Fg(1)=185N Using the Fg=mg, you can figure out the force exerted on the suitcase by gravity if there was no force pulling it: Fg=mg Fg=(23kg)(8=9.81m/s^2) Fg=225.63N Fg-Fg(1)=F experienced by handle 225.63N-185N=40.63N
December 7, 2009

math
Perms question Since there are 8 students, you say 8! or 8 factorial 8*7*6*5*4*3*2*1 8 first because there are 8 possible choices, 7 for the next one since one student has already been chosen, and so on. Answer is 40320
December 6, 2009

physics
Brightness also refers to intensity, or # of photons, what determines the kinetic energy of the ejected electrons is frequencey, as each photon releases 1 electron, if the photon has enough energy to overcome the work function, the remaining energy is then transformed into the...
December 5, 2009

12th grade
This is probably waaaaay to late, but period can be determined using b=180/p b=3 period is 60
November 15, 2009

Physics 30
Thanks
November 11, 2009

Physics 30
I got stuck after i attempted to use 1/f=1/di+1/do, seeing as how i need di, which i dont have.
November 11, 2009

Physics 30
An object located in front of a concave mirror with a radius of curvature of 80 cm produces an invert image that is three times the size of the object. Calculate the distance between the object and the mirror.
November 11, 2009

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