Thursday

July 24, 2014

July 24, 2014

Total # Posts: 323

**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?

**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

**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...

**Physics**

531684.027J

**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?

**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, ...

**Physics**

Thanks.

**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 ve...

**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?

**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?

**writing paper for political science**

Ok then I will start at that point.

**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?

**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...

**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 info...

**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

**Chemical Engineering**

I got the same answer

**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.

**Astrology / Physics**

The calculations/concepts here are actually physics.

**Astrology / Physics**

How do we calculate the radial velocity after the recession velocity is known?

**Chemistry**

Does methanol absorb UV light?

**Chemistry**

Does water and methanol absorb light in the UV-Vis region?

**algebra**

Find the function value. f(x)=x^3 f(-8)=

**algebra**

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

**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 ce...

**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?

**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...

**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 ...

**Chemistry**

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

**Chemistry**

Sorry. What I meant was: How do we improve the efficiency of Flash Column Chromatography?

**Chemsitry**

How do we improve the efficiency of Column Chromatography?

**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

**Biochemistry**

Is ATP an allosteric inhibitor for protease?

**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?

**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?

**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

**Chemistry**

Is Al(OH)3 soluble in KOH or K2C2O4•3H2O?

**Math 30**

Yes, 2^9.

**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?

**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?

**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 slow...

**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?

**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...

**Chemistry**

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

**math**

h(x) = 1.95 x + 72.85 h(x) = 1.95(35) + 72.85 h(x) = 141.10

**apchem**

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

**apche,m**

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

**spelling**

The plural of family is families. So the first sentence is right.

**Chemistry**

What is the colour of: 1. Cu+ 2. Cu2+ 3. Cu3+?

**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.

**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

**math**

-6x + 3 =-7 - 5x -6x + 5x = -7 - 3 -x = -10 x = 10

**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

**Chemistry**

What is the stoichiometric ratio for Cu2+ ions with cuprizone to form the copper-cuprizone complex?

**math**

average of: 8; 10; 12; 14; 16 = (8 + 10 + 12 + 14 + 16) / 5 = 60 / 5 = 12

**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

**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

**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?

**Chemistry**

What is the stoichiometric ratio for Cu2+ ions with cuprizone to form the copper-cuprizone complex?

**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

**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?

**Chemistry**

What would be the most likely product(s) when you react CuI with NH4OH?

**Chemistry**

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

**Physics Tough question!**

o wow, i didnt even think of the geometrical way, thanks.

**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...

**Physics**

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

**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...

**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!

**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.

**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.

**Physics**

Thanks

**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 ...

**Chemistry**

What are the possible side reactions for this case?

**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?

**Phyics**

Thanks a lot!

**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...

**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! (:

**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

**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)

**Math**

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

**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?

**math**

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

**Chemistry**

Calculate the volume occupied by 18g of water vapor at 100C at 1 atm. Show calculations

**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 =\

**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

**Science **

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

**algebra**

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

**Physics**

huh....

**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...

**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

**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.

**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

**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 nowh...

**Science **

a)

**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

**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

**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...

**12th grade**

This is probably waaaaay to late, but period can be determined using b=180/p b=3 period is 60

**Physics 30**

Thanks

**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.

**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.

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