Homework Help

how exactly do yo find the number of moles of 1 element in a compound of a given weight i know to convert mass to moles the given mass of the element is divided by the mass of one mole of the element.

When launched at an angle a to the horizontal, a projectile falls a distance D1 short of a target. If the projectile is fired at an angle b to the horiztonal, it reaches a distance D2 beyond the target. Assuming that C is the correct angle for a launched projectile to hit the target, show that: Sin2C = D2Sina + D1Sinb D1+D2 Well... If its a 'Sin2C' identity, it probably comes from Cosine times Sine. It probably goes like: -Find time of flight -Find a formula expressing the launch angle. -rinse and repeat for the second launch. -Equate the two, and mess with it til the desired result. EDIT: question states that both launch…

Hi I am in college doing basic biology. Having trouble with the diversity of life and ecology stuff. Did good on most of my tests though. GOing through ssome serious personal problems. THought a tutor would be best. I am not realy cheap or picky on pay. Was wondering if there are any good people in that subject would not mind being hired online for that? let me know. If not is there a better site for it? The other sites seem so wierd. I was looking for instant interaction with someone. I mean I know they are out there. WHo is going to give up being hired to help someone out in a topic or subject they love?

A particle is under the influence of 5 forces. Three of these forces are reversed, and the particle remains in equilibrium. Prove that the particle will remain in equilibrium even if these three forces were removed altogether. My thinking for this is: With three of the forces gone, the 2 forces (F1 and F2 ) left must balance the system if its to remain at equilibrium. If change of forces occurs, the system will react by moving to a new state of equilibrium. No reaction means that the 3 forces in the question cancel out each other, and no shift occurs. If the three forces balance to 0, there is no need to have them as acting on the particle. Right? If im right, Is th…

A force of magnitude F acting up and along a smooth inclined plane, can support a mass M in equilibrium. If a force of the same magnitude acts horizontally, it can support a mass m on the same inclined plane in equilibrium. Find a relationship between F, M and m which is independent of the angle of inclination of the slope. Im not so sure on this one... I guess you: Take each force and particle separately. Resolve the forces into horizontal/vertical components. Let the sum of all these forces equal 0. Do the same for the second particle and equate the two equations to each other through F. Good so far?

Original question: A load of weight W is supported in equilibrium by two strings attached to it. One is inclined at an angle 30 to the vertical, and the other is inclined at an angle 60 to the vertical. If either rope breaks if the tension exceeds a value of To, Find the greatest value of W that can be supported. What I have so far: Well, its at equilibruim. So all the forces equal 0. Since we are looking for the greatest value, we set the tension in both strings as To as specified. Its at angles, so we need to get the horizontal and vertical components of each string. Which look like: To Cos30 + To Sin30 and To Cos60 +To Sin60 Am I good so far? Main p…

Hey. This is a little tricky The question goes: A train travels from rest at station A to rest again at station B in a time of 4 minutes and a distance of 9km. The greatest speed attained is 60m/s, and both the acceleration and decceleration are uniform. Find how far the train goes at full speed? I know what I need to do to get the answer, but I dont have enough info for it. -Find the time at a constant speed (Tc) -Find distance using the formula: S=UTc To find Tc, I need either: -Distance travelled during deceleration/acceleration. -Time to accelerate from rest to 60m/s. -Time to decelerate from 60m/s to rest. Get any of those four, some mat…

Hello, I'm posting this for my 7 year old son, who asked me a question that I cannot answer, or find the answer to. He wants an explanation for why the suns rays cannot escape once they enter our atmosphere, if they can get in in the first place they why can't they get out..??? We understand the greenhouse gases preventing the heat from escaping but why would they stop the heat from getting in in the first place. If someone can give us a clear answer I would appreciate it. thanks for you time. Mandy

Which should be the most basic feature in determining whether a thing is living or not: genetic material or cellular structure?

Hi!!! I have the following exercise: describe the set of solutions of a linear system as a coset of an appropriate subspace. Could you give me an example?

A 5 meter long 10Kg bar is pivoted at the center and has a 10Kg weight attached to one end of it. A man at the bottom will push the weight and release it directly below the pivot point. At what speed does it need to be going at release in order to reach the top? (g = 10 m/s2) Any help will do!!

Hi, I decided to post this on this site because my project is loosely related to chemistry. For a school project, I started a petition that has to do with obesity and high-fructose corn syrup. All I need at this stage in the project is signatures. So can you please sign my petition here?: http://wh.gov/lCiH9 Thanks!

Can anybody help me with synthesis of 2,3-dihydroindole from 2-nitrotoluene. I need make it up in about seven steps. This is my solution, but I´m not sure about the last step. Thanks

1.)100 g of water are mixed with 150 g of alcohol (w= 790kg/m3 ). What is the specific gravity of the resulting mixtures, assuming the fluids mixed completely? 2.)A certain location has barometric reading of 720 mm Hg and the gravitational acceleration is 9.2 m/s2 . If the temperature of mercury is 9 degree Celsius at which density is 12,850 kg/m3, compute the atmospheric pressure. 3.)In a certain steam plant, the turbine develops 1000 KW. The heat supplied to the steam in the boiler is 2800 KJ/kg, the heat rejected by the system to the cooling water in the condenser is 2100 KJ/kg and the feed pump work is 5KW. Calculate steam flow in kg/sec.

Just before I delve into my question I'm just gonna say, I think my misunderstanding has to do with 1) the definition of a calorie and 2) how energy and temperature work together. So, my textbook says that a calorie is how much energy one would need to raise the temperature of 1g of water 1°C (also 4.184 joules), is this not true? BUT, it is also tells me a page later, in the context of heat of vaporization, that it takes 580 calories to evaporate 1g of water that is 25°C. From the definition of a calorie, wouldn't it be 75 calories to evaporate it? Also, the reason why they say this is to show water's high heat of vaporization due to hydrogen bonding, does it hav…

Goodmorning/Goodevening everyone I have this assignment: A weatherman carried an aneroid barometer from the ground floor to his office atop of sears tower in Chicago. On the ground level, the barometer read 30.15in Hg absolute; on top it reads 28.607in Hg absolute. Assume that the average atmospheric air density was 0.075lb/ft^3, estimate the height of the building. First I solve for the change in pressure 30.15-28.607 = 1.543inHg Then converted it to lb/ft^2 =109.165 Pressure= density x gravity x height 109.165lb/ft^2 = 0.075h 109.165/0.075 =h H= 1455ft Why is that I need to neglect or disregard gravity in this problem?

Hi. I need to think up an experment to run in a research forest using either pressure guage, or using an infrared camera with which to infer air temperature via IR radiation off of foliage. The professor gave me the example of a student using a CO2 tester next to foliage, using the hypothesis that there would be less CO2 during the day because of photosynthesis. Sounds simple right? But I am super lost. I bought an atmospheric science textbook for this, but am just not comming up with anything; so here I am as a last resort as my deadline is approaching. I don't know if this is the right place for this, I cross posted (sorry!) this somewhere else but di…

I need help converting a concentration of ug/ml to moles (pmoles, umoles...) Stock solution of protein: 425 ug/ml MW: 100 kDa need to know how big a vol. (ul) to inject 10 umoles in total! Thanks

Do you guys think I got these right? 1) Briefly tell when an angle is in Standard Position. ANSWER - An angle is in standard position when - 1. its vertex A is at the origin of the x-y plane, 2. its initial side AB lies along the positive x-axis, and 3. its terminal side AC has rotated away from the x-axis. The angle is POSITIVE if AC has rotated away from the x-axis in a counter-clockwise direction. The angle is NEGATIVE if AC has rotated away from the x-axis in a clockwise direction. ---------------------------------------------------------- 2) Briefly explain when an angle is in the Third Quadrant. ANSWER - The x-y …

how to calculate the amount of LDH activity as a percentage of that present before heat inactivation (i.e. to give %activity restored)? incubation time (mins) BSA Hsp70 -ATP +ATP -ATP +ATP 0 0.28 0.28 0.3 0.38 10 0.3 0.32 0.68 1.65 20 0.29 0.31 0.93 2.63 30 0.37 0.41 1.17 4.58 40 0.45 0.48 1.17 6.52 50 0.57 0.6 1.55 8…

Which is the most acidic proton in 2-methyl-2-cyclopenten-1-one, and why?

hi, can somebody help me My task: Determine the force with which you have to pull the two suspend sorts at least on paper straight down, so that the paper unrolls. Allows you to choose which suspension is therefore easier. My approach: sin(∂)=Fn/T cos(∂)=Fg/T Fn = Fg/cos(∂) * sin(∂) = Fg * tan(∂) Fr= μ * Fn = μ * Fg * tan(∂) Fr=Fz Fz=μ * Fg * tan(∂) I think the difference between the two systems is the force exerted by the pulling force on the wall. Why is one easier than the other. I have no idea, how I can calculate the force which is produced by the pulling force. thanks already in advance

Research and briefly describe (no more than 4 sentences) two examples of each of the following types of health care interventions to help treat abnormal human structure and function: two examples of each of the following types of health care interventions to help treat abnormal human structure and function: 1 Medication intervention:2 examples. 2 Non-medication intervention:2 examples 3 Invasive intervention:2 examples 4 Non-invasive intervention:2 examples 5 Psychological therapies: 6 Spiritual therapies :2 examples. thank you very much.

Research two different complementary philosophies related to abnormal human structure and function, which is based on cultural, spiritual or holistic principle? anyone has clue with the question? cheers

Can the trait shown in the pedigree be X linked recessive?