Friday

April 18, 2014

April 18, 2014

**Recent Homework Questions About Law**

Post a New Question | Current Questions

**PHYSICS PLEASE HELP ME**

The law of conservation of linear momentum vector p₁ +vector p₂ =vectorp₁`+vector p₂` Projections on the axis x and y p₁⒳ +p₂⒳= p₁`⒳+p₂`⒳ p₁⒴ +p₂⒴= p₁`⒴+p₂`⒴...
*Friday, November 30, 2012 at 3:30am*

**PUBLIC RELATION**

Can someone tell me what is the differences between public relation and legal ethics? i know there is, lawyer practise in court of aw where there is fairness and equal representation while PR work in court of opinion. Lawyers advise clients on what they must legally do to ...
*Friday, November 30, 2012 at 2:24am*

**MATH**

Using the law of cosines: x1^2 = 100^2 + 500^2 - 2*100*500*cos(85) x1^2 = 100^2 + 500^2 - 2*100*500*0.087155743 x1^2 = 251284.4257 x1 = 501.28 Similarly, for the other side, we know that the angle between the tower and the ground is 90+5=95. Using the law of cosines to solve ...
*Thursday, November 29, 2012 at 11:28pm*

**Science**

I need help with 2 questions please. 1.What are the three parts of the law of conservation of mass/matter? Do not need the definition but the 3 laws please. Wikipedia and other sites just gives me the definition of the law of conversation. 2. How are velocity, speed, and ...
*Thursday, November 29, 2012 at 8:45pm*

**SCIENCE**

I have 2 questions that I need help with please. 1.What are the three parts of the law of conservation of mass/matter? Do not need the definition but the 3 laws please. 2. How are velocity, speed, and acceleration related? I know how they are different only. Thank you
*Thursday, November 29, 2012 at 8:06pm*

**math**

1) Write the fraction 5/9 as a percent.Round to the nearest hundredth of a percent where necessary. 2)Write the decimal 0.079 as a percent. 3)In the country of Sweden, a bill becomes a law only if 38/50 of the senators approve it. What percentage 50 is 38/50?
*Thursday, November 29, 2012 at 4:51pm*

**trig**

I assume you are studying vectors. Draw a line at 28° of length 200 (your resultant) Draw a line at 38° of length 207, join its tail to the first line. That smaller line will be the vector representing the wind I see a triangle with sides 200 and 207, with a contained ...
*Thursday, November 29, 2012 at 8:40am*

**trigonometry**

1. What is the area of triangle ABC if a = 47.0°, β = 57.8°, and a = 10.2 cm? A. 58.2 cm2 B. 43.5 cm2 C. 38.4 cm2 D. 33.3 cm2 2. Given triangle ABC with β = 41°, g = 14°, and a = 5.0, find the value of c. A. 6.2 B. 4.0 C. 1.5 D. 17 3. Resolve the ...
*Wednesday, November 28, 2012 at 11:18pm*

**physics**

A 53.6 kg circus performer bobs up and down at the end of a long elastic rope at a rate of once every 2.80 s. The elastic rope obeys Hooke's law. Find how much the rope is extended beyond its unloaded length when the performer hangs at rest. ** I think Im missing a step ...
*Wednesday, November 28, 2012 at 8:33pm*

**Ethics & Justice Administration**

If I am looking to support my pro capital punishment theories which of the following ethical theories would best support my stance? I must use two. Absolutism, ethical formalism, utilitarianism, hedonism-stoicism, natural law, ethics of virtue, ethics of care, egoism, cultural...
*Wednesday, November 28, 2012 at 4:12pm*

**Math**

1. What is the area of triangle ABC if a = 47.0°, β = 57.8°, and a = 10.2 cm? A. 58.2 cm2 B. 43.5 cm2 C. 38.4 cm2 D. 33.3 cm2 2. Given triangle ABC with β = 41°, g = 14°, and a = 5.0, find the value of c. A. 6.2 B. 4.0 C. 1.5 D. 17 3. Resolve the ...
*Wednesday, November 28, 2012 at 2:24pm*

**Pre-Cal**

draw a diagram. seen from the plane, the top and bottom of the building subtend an angle of 3° using the law of sines, the distance from the top of the building to the plane can be found by 40/sin3° = d/sin50° d = 585.48 m (h-40)/d = sin37° h = 392.35 m
*Wednesday, November 28, 2012 at 12:30pm*

**Chemistry**

Objectives To determine the molecular weight of a volatile liquid. Discussion [This laboratory exercise was adapted from one in Beran and Brady's Laboratory Manual for General Chemistry , John Wiley & Sons, 1982] The Dumas Method for determining the molecular weight of a ...
*Tuesday, November 27, 2012 at 9:32pm*

**Science 8R - help**

the law of conservation of matter and energy states that energy and matter cannot be created or destroyed, only converted from one form to another. the cycle of matter in the food chain is that matter is built to create a body, when it is consumed it is broken down and formed ...
*Tuesday, November 27, 2012 at 9:22pm*

**Science 8R - help**

How does the Law of conservation of energy compared to the conservation of matter? please help
*Tuesday, November 27, 2012 at 8:22pm*

**chemistry**

To two digit accuracy Moseley's law is 10.2 ev x (atomic number -1)^2 = 10.2 x *(27)^2 = ? eV
*Tuesday, November 27, 2012 at 6:32pm*

**trigonometry**

or, if you're not into vectors, try using the law of cosines and law of sines: the resultant r is r^2 = 2^2 + 12^2 - 2*2*12 cos120° r^2 = 172 r = 13.115 the angle θ between the big force and the resultant is sinθ/2 = sin120°/13.115 sinθ = 0.1321 &#...
*Tuesday, November 27, 2012 at 2:53pm*

**chemistry**

What is Boyle's Law constant if a sealed rigid container with a volume of 650 mL has a pressure of 131.1 kPa ?
*Tuesday, November 27, 2012 at 1:53pm*

**Physics**

m=2.5 kg. R=D/2=0.1 m, n₀=3600 rpm=3600/60=60 rev/s t=10 s. F=? 2πn=2πn₀-εt. Final n=0 2πn₀ = εt. ε =2πn₀/t. Newton’s 2 law for rotation: Iε=M. If the wheel is disc I=mR²/2, M=FR. Then (mR²/2) •...
*Tuesday, November 27, 2012 at 9:26am*

**Teacher Aide-Pennfoster**

1. The Stubborn Child Law enacted by Massachusetts in 1646 permitted parents to A. use corporal punishment when children disobeyed them. B. keep children out of school if they were needed for family work purposes. C. institutionalize a child born with a physical or mental ...
*Tuesday, November 27, 2012 at 9:00am*

**physics**

m₁=1500 kg, m₂=2500 kg, v₁=5mph=2.24 m/s, claimed velocity is u=10 mph=4.47 m/s, real speed of the pickup is v₂=? μ=0.49, s=5 m. Law of conservation of linear momentum m₁•v₁+m₂•v₂=(m₁+m₂)•v...
*Tuesday, November 27, 2012 at 8:53am*

**Physics**

What is the obervation? Which are the gas law choices? You must not have copied the entire question correctly
*Tuesday, November 27, 2012 at 12:30am*

**math**

Home work help plz a)what would be the cost of the activity in the first week b)what would be the cost of the activity each subsequent week Mrs ogden has heard about aqua aerobics from her sister in law. she wants to join her sister in law and her friends in classes three ...
*Tuesday, November 27, 2012 at 12:08am*

**Physics**

When an inflated baloon is been put in the freezer for 15 minutes, which of the ideal gas law is the observation
*Monday, November 26, 2012 at 11:18pm*

**Physics**

F=kq^2/d^2 coulombs law q=sqrt( F*d^2/k)
*Monday, November 26, 2012 at 9:32pm*

**Physics**

p=mv=2.3•10⁶•6•10⁶=13.8•10¹² kg•m/s. p₁= m₁v₁= 5.2•10⁵•2•10⁶=10.4•10¹¹kg•m/s. p₂=m₂v₂=8.4•10309;•9•10 ⁵...
*Monday, November 26, 2012 at 3:15pm*

**Chemisty**

A student following the procedure described in this experiment collected the following data: Mass Mg,g 0.0243 volume of gas mL 25.5 barometric pressure, mm Hg 298 Calculate the value of the gas law constant, R. Please help me work this out, I have no idea. Thank you!
*Monday, November 26, 2012 at 2:15pm*

**Physics**

p₁=8.9•10⁻²³ kg•m/s p₂=5.35•10⁻²³ kg•m/s Law of conservation of linear momentum 0=vector p₁+vector p₂+vector p, 0=vector p₁₂ + vector p, p₁₂=sqrt(p₁²+p&#...
*Monday, November 26, 2012 at 12:29pm*

**physics**

(a) The forces are equal and opposite in direction. F = G*M1*M2/R^2 It's Newton's law of gravity. Learn it. Look up the constant G and solve for F. (b) let F = 2.0*10^-9 N in the equation above and solve for separation R.
*Monday, November 26, 2012 at 12:10am*

**Physics**

If a supersaturated sugar solution is allowed to evaporate slowly, sugar crystals form in the container. Hence, sugar molecules go from a disordered form (in solution) to a highly ordered, crystalline form. Does this process violate the second law of thermodynamics? Explain.
*Sunday, November 25, 2012 at 9:47pm*

**Physics**

Internal energy is U=3•n•R•T/2 => chage in internal energy is ΔU=3•n•R•ΔT/2. From the ideal gas law PV=nRT => n•R•ΔT=nR(T2-T1)=p2•V2 =p1•V1=p(V2-V1) => ΔU=3•n•R•ΔT/2=3&#...
*Sunday, November 25, 2012 at 5:14am*

**Physics**

Internal energy is U=3•n•R•T/2 => chage in internal energy is ΔU=3•n•R•ΔT/2. From the ideal gas law PV=nRT => n•R•ΔT=nR(T2-T1)=p2•V2 =p1•V1=p(V2-V1) => ΔU=3•n•R•ΔT/2=3&#...
*Sunday, November 25, 2012 at 5:14am*

**Physics**

Internal energy is U=3•n•R•T/2 => chage in internal energy is ΔU=3•n•R•ΔT/2. From the ideal gas law PV=nRT => n•R•ΔT=nR(T2-T1)=p2•V2 =p1•V1=p(V2-V1) => ΔU=3•n•R•ΔT/2=3&#...
*Sunday, November 25, 2012 at 5:14am*

**Physics**

Internal energy is U=3•n•R•T/2 => chage in internal energy is ΔU=3•n•R•ΔT/2. From the ideal gas law PV=nRT => n•R•ΔT=nR(T2-T1)=p2•V2 =p1•V1=p(V2-V1) => ΔU=3•n•R•ΔT/2=3&#...
*Sunday, November 25, 2012 at 5:14am*

**Math**

The population of a southern city follows the exponential law. If the population doubled in size over 13 months and the current population is 30,000 what will the population be in 5 years from now?
*Friday, November 23, 2012 at 3:30pm*

**Physics**

Use Snell's law to compute the angle of refraction for each color. Call the angles A1 and A2. Then compute the difference, A1 - A2. . Red: sin35.8 = 1.520*sinA1 sinA1 = 0.38484 A1 = 22.63 degrees Green: sin35.8 = 1.526*sinA2. A2 = ___ A1 - A2 = ___
*Friday, November 23, 2012 at 1:43am*

**Chemistry**

Bragg's Law will get it for you.
*Thursday, November 22, 2012 at 11:01pm*

**Physics. Free electron density, please help!**

Call the free electron density N, m^-3 e = electron charge , Coulombs V = electron drift speed I = current, Amps A = cross sectional area, pi r^2, m^2 I = N*A*e*V Solve for N in this case. Get the current I from ohms law. I = V/R
*Wednesday, November 21, 2012 at 11:53pm*

**Physics. Free electron density, please help!**

Compute the current I using Ohm's law. The flux of free electrons F is the free electron density tomes the drift velocity v. If you multiply this flux by the electron charge and the cross section, you get the current. By equating this with what you get from Ohm's law, ...
*Wednesday, November 21, 2012 at 11:52pm*

**Corporate law**

At a closing at 10 a.m. on May 3, 2005, X Corp. delivers $25,000,000 to the seller of a factory using $20,000,000 from Bank One secured by a mortgage on the property, and the attorney for X Corp. records its title to the property at the same time. At 2 p.m. the same day, X ...
*Wednesday, November 21, 2012 at 10:25am*

**precalculus**

You have to know the logarithm rules and definition Definition: if log(base a)x=b then x=a^b Rules-I am going to use base 10 but it applies for every base: 1) loga^r=rloga 2)log(a*b)=loga+logb 3)log(a/b)=loga-logb 4)change of base: loga=log(base b)a/log(baseb)10 So the first ...
*Wednesday, November 21, 2012 at 4:51am*

**MATH 112**

two planes leave an airport at the same time. Their speeds are 320 miles per hour and 380 miles per hour. If the angle between their courses is 112 degrees, how far apart are they after two hours? (The hint is using the law of cosines)
*Tuesday, November 20, 2012 at 9:39pm*

**Physics**

Cosine Law u=sqrt(V²+v²-2•V•v•cos135°)= =sqrt(200²+90²-2•200•;90•cos135°)= =sqrt(40000+8100 +25455.8)=271 km/h s=u•t=271•3=813 km Sine Law 271/sin135°=90/sinβ sinβ=90•sin135°...
*Tuesday, November 20, 2012 at 1:07pm*

**Physics**

The law of conservation of linear momentum for inelastic collision m1•v1 - m2•v2=(m1+m2)•u u= {m1•v1 - m2•v2}/(m1+m2)= ={0.241•1.53 -0.321•2.49)/(0.241+0.321)= =-0.766 m/s. (in the direction of the second pizza motion)
*Tuesday, November 20, 2012 at 12:31pm*

**Chemistry**

The following three step mechanism has been proposed for the oxidation of iodide ion by peroxide: H2o2 + I^- ----> HOI + OH^- Slow OH^- + H^+ ----> H2O Fast HOI + H^+ + I^+ ---> I2 + H2O Fast A. What is the overall reaction described by this mechanism? B. What is the ...
*Tuesday, November 20, 2012 at 11:58am*

**chemistry**

472 mL of H2 gas was collected over water when 1.256 g of Zn reacted with excess HCl. The atmospheric pressure during the experiment was 754 mm Hg and the temperature was 26 degrees C. A. Write the balanced chemical equation (I have this) Zn + HCl ---> ZnCl2 + H2 B. What is...
*Monday, November 19, 2012 at 10:51pm*

**chemistry**

472 mL of H2 gas was collected over water when 1.256 g of Zn reacted with excess HCl. The atmospheric pressure during the experiment was 754 mm Hg and the temperature was 26 degrees C. A. Write the balanced chemical equation (I have this) Zn + HCl ---> ZnCl2 + H2 B. What is...
*Monday, November 19, 2012 at 6:29pm*

**Physics**

The mass of gravel is m2=441•2.67 = 1177.47 kg The law of conservation of linear momentum m1•v1= (m1+m2)v2 v2= m1•v1/(m1+m2) = =2150•2.29/(2150+1177.47)=1.48 m/s
*Monday, November 19, 2012 at 4:34pm*

**physics**

A daredevil plans to bungee jump from a balloon 53.0 m above a carnival midway. He will use a uniform elastic cord, tied to a harness around his body, to stop his fall at a point 10.0 m above the ground. Model his body as a particle and the cord as having negligible mass and ...
*Sunday, November 18, 2012 at 10:17pm*

**chemistry**

EDX FRAUD AND PLAGIARISM SITED. BE ADVISED YOU WILL BE ARRESTED AND JAILED BY YOUR LOCAL LAW-ENFORCEMENT AUTHORITY WITHIN 24 HOURS.
*Sunday, November 18, 2012 at 7:25pm*

**Chemical Engineering: Raoult's Law**

A binary mixture of benzene and styrene is kept in a closed vessel at equilibrium such that both liquid and vapor phases co-exist. The total amount of moles in the vessel is 100. The total moles of benzene that is distributed in the liquid and vapor phases is 35. The ...
*Sunday, November 18, 2012 at 8:36am*

**Maths**

3. Ohm’s law states that the current flowing in a circuit varies directly as the applied voltage and inversely as the resistance. In an experiment, the resistance was increased by triple the percentage by which the voltage was increased. A student calculated the percent ...
*Saturday, November 17, 2012 at 3:05am*

**science**

It takes 3.38 J of work to stretch a Hooke’s-law spring 5.63 cm from its unstressed length. How much the extra work is required to stretch it an additional 4.22 cm? Answer in units of J
*Friday, November 16, 2012 at 10:38pm*

**chem**

how much heat is required to vaporize 34.8g of water at 100 degrees celcious?
*Friday, November 16, 2012 at 12:46pm*

**Physics**

Use Poiseuille's Law, and sub rho*g*h for (P2-P1)
*Thursday, November 15, 2012 at 4:41pm*

**US Gov**

Please help, I'm really stuck on these 1. Which court tries cases involving US citizens who have been accused of breaking federal laws? 2. What are the permanent bodies in Congress that review new bills related to issues of recurring importance called? 3. What is proposed ...
*Thursday, November 15, 2012 at 11:16am*

**Physics**

Use the law of moments to answer this question. The total of the rear wheel forces and the front wheel forces equals the weight, M g = 81,732 N. Most of the weight will be on the rear wheels. You will need to know the distance of the center of gravity from the rear wheels, and...
*Thursday, November 15, 2012 at 6:03am*

**Physics - Astronomy**

Kepler's third law says that, for all objects orbiting the same large mass, P^2/R^3 = constant P is the period; R is the orbit radius. If the moon's period is 3 times the ring gap object's period [R(gap)/R(moon)]^3 = [P(gap)/P(moon)]^2 = 1/9 [R(gap)/R(moon)] = cube...
*Thursday, November 15, 2012 at 3:02am*

**Physics - Astronomy**

A hypothetical moon is orbiting Saturn in a circular orbit that has exactly 3 times the period that an object orbiting in one of one of the gaps in Saturn's rings would have. As measured from the center of Saturn at what fraction [to 3 decimal places] of that moon's ...
*Thursday, November 15, 2012 at 12:48am*

**chemistry**

Dalton's Law says that the total pressure of a system is the sum of the individual partial pressures of any gas(es) present.
*Wednesday, November 14, 2012 at 9:41pm*

**chemistry**

consider the following changes at constant temperature & pressure H2O(s) --yields-- H20(l); Delta H1 H2O(l) --yields-- H2O(g); Delta H2 H2O(g) --yields-- H2O(s); Delta H3 Using Hess's law, the sum of the deltas is a. equal to 0 b. sometimes greater than zero, sometimes ...
*Wednesday, November 14, 2012 at 9:24pm*

**physics**

State the law of acceleration in its full form and give examples of how it works
*Wednesday, November 14, 2012 at 7:40pm*

**Physics Word Problem**

using Snell's Law (sin(theta1)/sin(theta2) = v1/v2 where (theta1) is the angle of incidence and (theta2) is the angle of refration. The number V1/V2 is called the index of refraction. The index of refraction from air to water is 4/3. If a ray of light passes through the ...
*Wednesday, November 14, 2012 at 6:55pm*

**Physics Word Problem**

using Snell's Law (sin(theta1)/sin(theta2) = v1/v2 where (theta1) is the angle of incidence and (theta2) is the angle of refration. The number V1/V2 is called the index of refraction. The index of refraction from air to water is 4/3. If a ray of light passes through the ...
*Wednesday, November 14, 2012 at 6:53pm*

**Chemistry**

Calculate delta H for the reaction below using Hess's Law: C2H6 ---> C2H2 + 2H2 ------------------------------------------ C2H2 + 5/2O2 --> 2CO2 + H2O (H = -1300 kJ) 2H2 + O2 --> 2H2O (H= -572 kJ) 2C2H6 + 7O2 --> 4CO2 + 6H2O (H= -3120 kJ)
*Wednesday, November 14, 2012 at 4:24pm*

**American history **

Can someone help me go over my answers 1. If you were a reform-minded person who, above all, loathed the social problems associated with alcohol, you would have been especially sympathetic to the (A. WCTU.) B. Mugwumps. C. Comstock Law. D. evangelical efforts of Dwight L. ...
*Tuesday, November 13, 2012 at 2:47pm*

**Precalc/Triangles**

Unless you were told to do so, why must it be right-angled e.g. triangle ABC , were a=7, c=14 and angle A = 29° (assuming you are using the convention of labeling the vertices with captital letters and the sides opposite with small letters by Sine Law SinC/14 = sin29/7 ...
*Tuesday, November 13, 2012 at 10:17am*

**Chemistry**

If you have two sets of conditions, the easy gas law to use is the (P1V1/T1) = (P2V2/T2) If you don't have two sets of data you almost certainly must use PV = nRT. Many times, and this problem is one of them, the problem gives grams so you calculate mols = n = grams/molar ...
*Monday, November 12, 2012 at 8:25pm*

**Chemistry**

Chemical Kinetics Lab - Ascorbic Acid Reduction of Iron (III) The object of this experiment was to determine a rate law and a rate constant. The reaction that was studied was: 2 Fe(CN)6 ^-3 + C6H8O6 = 2 Fe(CN)6 ^-4 + C6H8O6 + 2H ^+ Summary of obtained values: m = 1 n = 1 k = ....
*Monday, November 12, 2012 at 7:55pm*

**Chemistry**

A 3.80 L cylinder contains 6.83 g of methane, CH4, at a pressure of 3320 mmHg. What is the temp. Of the gas? I mainly have problems being able to tell which gas law equation I need to use when asked these types of questions and then being able to rearrange the equation to find...
*Monday, November 12, 2012 at 7:25pm*

**calculus**

the law of cosines uses the angle between the sides, which in our case is the angle between the hour hand and the minute hand. since the equations are hour hand is 2cos(2pi/720 t) min. hand is 3cos(2pi/60 t) the angle between the hands is 2pi/720 t - 2pi/60 t = pi/360 t - pi/...
*Monday, November 12, 2012 at 4:05am*

**physics**

A) can be explained by Newton's 1st law. B) can be explained by Newton's third?
*Saturday, November 10, 2012 at 6:21pm*

**Physics**

(a) P + (1/2)*rho*V^2 + (rgo)*g*y = constant. That's Bernoulli's law, neglecting fluid frictional pressure drops, for incompressible flow. Elevation is y = 2.50 m on the high side, and is zero on the low side. You know the pressure on both sides, and that V(high) = V(...
*Friday, November 9, 2012 at 7:24pm*

**Chem**

Convert the path length to cm. Plug in Beer's law equation and solve for c. A = ε l c http://www.chm.davidson.edu/vce/spectrophotometry/beerslaw.html
*Friday, November 9, 2012 at 1:43pm*

**Chemistry (henry's law and IGL)**

I think Henry's Law applies whether the gas ideal or not. I think it's more important to ask if the gas reacts with the solvent; e.g., CO2 reacts with H2O to form a small amount of H2CO3. In practice, however, I see Henry's Law used in most circumstances, ideal or ...
*Thursday, November 8, 2012 at 2:39pm*

**Chemistry (henry's law and IGL)**

Can Henry's Law be used for gases that obey the Ideal Gas Law? What about gases that do not obey the ideal gas law? when can you use/Not use henry's law?
*Thursday, November 8, 2012 at 10:14am*

**us history**

1. income or money is called 2. a suggestion for a new law in congress is called 3. to make a change in the constitution is to make an 4. to help an enemy of your country is the crime of 5. a serious crime is known as
*Thursday, November 8, 2012 at 12:01am*

**college physics**

Newton's second law states that for every action there is an equal and opposite reaction. Draw a force diagram. It is moving at a constant velocity. Your force diagram for an object moving at a constant velocity is the same as your force diagram for an object at rest, so ...
*Wednesday, November 7, 2012 at 6:20pm*

**Physics Help!**

Use the ideal gas law. n = P*V/(R*T) R = 0.08206 liter*atm/(mole*K) T = 293.0 K P = 8.70 atm V = 8.45 l Solve for n, which will be in moles. n = 3.06 (moles)
*Wednesday, November 7, 2012 at 6:47am*

**Trigonometry**

one way is to use the law of cosines. a^2 = b^2+c^2 - 2bc cosA Without loss of generality, we may take a to be the smallest side, of length 2. Then, 2^2 = 4^2 + 5^2 - 2*4*5 cosA A = 22.33 similarly, B = 49.45 C = 108.22
*Wednesday, November 7, 2012 at 1:55am*

**world history**

What was the type of monarchy where rulers are limited by law?
*Tuesday, November 6, 2012 at 8:27pm*

**Physics HELP!**

The law of conservation of angular momentum I₁•ω₁ = I₂•ω₂ I₁ =mR²/2, ω₁ = 5.1 rad/s I₂ = mR²/2 +m₀•r². ω₂ = ? (mR²/2) • ω₁=(mR²/2 +m₀•r...
*Tuesday, November 6, 2012 at 4:15pm*

**Physics HELP!**

The law of conservation of angular momentum I₁•ω₁ = I₂•ω₂ I₁ =mR²/2, ω₁ = 5.1 rad/s I₂ = mR²/2 +m₀•R². ω₂ = ? (mR²/2) • ω₁=(mR²/2 +m₀•R...
*Tuesday, November 6, 2012 at 3:54pm*

**Physics- Elena please help!**

Nnewton’s 2 Law for rotation M = I•ε, where angular acceleration ε=0.87 rad/s², the torque M = F•R , the moment of inertia I=mR²/2 , F•R= m•R²•ε/2, m=2•F/R•ε=2•180/0.45•0.87=919.54 kg I...
*Tuesday, November 6, 2012 at 3:39pm*

**pre-calc**

As usual, draw a diagram. This is where the law of cosines comes in. The distance x from A to B is x^2 = 30^2 + 40^2 - 2(30)(40)cos33° x = 22.07
*Tuesday, November 6, 2012 at 2:38pm*

**chem urgent!**

Set up a Hess's law cycle, and use the following information to calculate ÄH°f for aqueous nitric acid, HNO3(aq). You will need to use fractional coefficients for some equations. 3 NO2(g) + H2O(l) 2 HNO3(aq) + NO(g) ÄH° = -138.4 kJ 2 NO(g) + O2(g) 2 NO2(g...
*Tuesday, November 6, 2012 at 10:20am*

**chemical reaction engineering **

Propane steam reforming over an alumina supported Ni metal catalyst: C3H8 (g) + H2O (g) → CO2 (g) + H2 (g) is proposed to follow these mechanisms: C3H8 + 2S1 ↔ C2H5-S1 + CH3-S1 (M1) H2O + 2S2 ↔ OH-S2 + H-S2 (M2) CH3-S1 + OH-S2 → CH3O-S1 + H-S2 (M3) CH3O...
*Tuesday, November 6, 2012 at 7:51am*

**Chemistry: Need Help**

Suppose there is a simulation of 25 helium molecules and 25 nitrogen molecules on the right side of a box before the rate of effusion. Suppose you carry out this simulation and it does not give a precise quantitative reflection of Graham's Law. -->What could be done to ...
*Tuesday, November 6, 2012 at 5:47am*

**Physical Science Help!**

The voltage applied to the secondary circuit will be 12*(200/25) = 96 volts Use ohms law for the device current.
*Monday, November 5, 2012 at 9:03pm*

**Chemistry 1202**

Basically, Hess's law requires that you manipulate the equations (either by multiplying or dividing by a factor) and add (or subtract) the equations, such that terms in the final combined equation cancel out on either side to leave you with the equation you are trying to ...
*Monday, November 5, 2012 at 8:14pm*

**Chemistry**

Suppose there is a simulation of 25 helium molecules and 25 nitrogen molecules on the right hide of a box before the rate of effusion. Suppose you carry out this simulation and it does not give a precise quantitative reflection of Graham's Law. -->What could be done to ...
*Monday, November 5, 2012 at 7:11pm*

**Physics**

Centripetal acceleration a=ω²•R=T/m R=T/m•ω² The law of conservation of angular momentum I• ω²=I₀•ω₀² ω=(I₀/I)•ω₀²=(R₀²/R²)•ω...
*Monday, November 5, 2012 at 2:54pm*

**Physics**

The torque is M=F•cosα•L. The ball is material point => its moment of inertia is I=m•L². The Newton’s 2 law for rotation M=I•ε, F•cosα•L= m•L²•ε, ε= F•cosα•L/ m•L²=F&#...
*Monday, November 5, 2012 at 2:09pm*

**phisics**

m=7,45 g, m1=1220 g, m2=1603 g, v=348 m/s, v1 = 0.648 m/s The law of conservation of linear momentum for the 1st collision m•v+0=m1•v1+m•u u=(m•v-m1•v1)/m = v –(m1/m)v1= 348 – (1220/7.45) •0.648 = 241.9 m/s, The law of conservation of ...
*Monday, November 5, 2012 at 12:28pm*

**Physics**

m=7,45 g, m1=1220 g, m2=1603 g, v=348 m/s, v1 = 0.648 m/s The law of conservation of linear momentum for the 1st collision m•v+0=m1•v1+m•u u=(m•v-m1•v1)/m = v –(m1/m)v1= 348 – (1220/7.45) •0.648 = 241.9 m/s, The law of conservation of ...
*Monday, November 5, 2012 at 12:20pm*

**chem**

What's Dalton's Law. The total pressure of a gas system is the sum of the individual partial pressures of the gases. Ptotal = pO2 + pCl2 + pF2
*Monday, November 5, 2012 at 11:44am*

**math**

let AD = DC = x then AB = 2x in triangle ABC , angle B = angle C =Ø in triangle BCD , angle C = angle BDC = Ø 2 angles of one are equal to 2 angles of the other, so they are similar then: 2/x = 2x/2 2x^2 = 4 x^2=2 x=√2 So triangle ABC has equal sides of 2&#...
*Monday, November 5, 2012 at 7:54am*

**Physics**

How far apart are they? Is the charge in Coulombs? The force they exert on each other will be independent of the external E field. Use Coulomb's Law.
*Monday, November 5, 2012 at 5:20am*

**Chemistry**

Suppose there is a simulation of 25 helium molecules and 25 nitrogen molecules on the right hide of a box before the rate of effusion. Calculate the theoretical ratio of rate of effusion of Helium to Nitrogen: **Which is the Square root of 28/4 = 2.646** Suppose you carry out ...
*Monday, November 5, 2012 at 12:25am*

**physics**

In a paragraph, use the following words: Inertia, Acceleration, Kinetic Energy, and Newton's 1st Law to describe the physics at work during a car crash
*Sunday, November 4, 2012 at 5:45pm*

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