Homework Help

I have a task to do and am a bit stuck - and feeling rather thick Somewhere above atomic number 110 there is an island of stability where the atoms of elements are likely to have longer lifetimes. There is as yet an unknown element that has 120 protons and 174 newtrons, it is called utimatum and has the symbol Ul 1. I need to state the atomic number (120?) and give the full symbol for the isotope (is this 294 over 120 Ul?) 2. I have to give the Period and the Group of the periodic table where I would expect to find Ul and explain how I arrived at it (I am stuck here with the group and have it under period 7). 3. I have to name another chemilca elememt i…

what are they can anyone name them

okay i need help with understanding how the earth tilts to the sun during diffrent seasons. If the earth is at a constant tilt of 23.5% in the same direction how can it be tilted away from the sun in the winter but point towards it on the summer? I tried using my pencil as a visual but even though i spin it in circular motion it dosent change the tilt from one side to another. All help appreciated greatly

Suppose a firm in a perfectly competive industry is producing a output of 10 units. The firms total revenue at this output is $80 and its total cost is $30. The firms marginal cost associated with the 11 unit of a output is $12. What can i say about an increase in production should it produce 11 unit or no this is what i have output TC MC 10 $30 $3 per unit 11 $42 $12 per unit profit is $50 @10 units = 30/10 = $3 @11 unit = 42/11 = $3.80 it should not increase production because the cost more per unit to make did i go about this right? thanks joe

In my experiment , The plant (Chlorophyll )absorbs blue lights the highest but absorbs green light the lowest, what's the reason? Do the reasons are 1. the reflection of light ( colour ) ,2.the high energy from the blue light ? Would you like to suggest some other possible reasons for me, thank you.

Hi everyone, I'm new to these forums and require some help. I was given an experiment planning exercise by my physics teacher and need some idea of what to do. Basically, I need to investigate the relationship between the power supplied to a filament lamp and the temperature of the lamp's glass envelope. For the power adjustment I intend to use a variable resistor, power pack, voltmeter and ammeter setup (bearing in mind the P=IV). What should I use to measure the temperature of the glass, though? I've done some research into thermocouples, but I'm still not sure how exactly they work. Any suggestions would be appreciated. Thanks!

My teacher asked my class to do a homework to find the properties of hydrogen. I want to know that why once hydrogen atoms combines with other non-metal atoms, it shares its electrons instead of losing it?

i don't know if this is a stupid question but i can't seem to figure out the solution to the problem presented. 'You measure the photosynthesis speed of a North European plant. You measure it both under normal circumstances and at high concentrations of oxygen. Below are the results. How is it that the net CO2 fixation is lower at a higher oxygen concentration? I figure that it's because photosynthesis already produces O2 and if there's a high concentration of O2 already present then the plants won't take up CO2.

Ok. For school I am doing a research paper, on the following topics; Dark Matter and 11 Dimensions and M-Theory. If you wish to reply please post with the following format and information. Age: Where You Are: Your Occupation: What you know about Dark Matter, M-Theory, and 11 Dimensions: Thx for your time and help.

Spring break has ended and now I'm back in school and also new to the forums. This question I have is a review from Physics 20 and I have forgotten how to do it.... Question: The nearest star, Alpha Centauri A, is 4.07 x 10^16 m from Earth. a. How many light years is it away from Earth? b. What is the advantage of stating stellar distance in light years rather than meters? Part A, I got stuck because I don't know wheither to use the distance from the star to Earth, or the 9.46 x 10^15 m which is the distance light can travel in 1 year. If anyone can explain or help me, it would be much appreciated. Thanks.

Few questions here that I just cant seem to find the answer to in my home school book...these are all true or false questions.. #1.true or false:Fuels containe potential energy? t/f #2.Fuels,wind and moving water are Directly dependent on solar energy? t/f #3When hear energy travels by conduction,Energy is transferred from molecule? t/f #4.Wood is a good conductor? t/f #5.when gas or liquid is heated,Its molecules move away from each other? t/f #6.when heat energy travels by convection,energy is transferred by the circulation of heated material. t/f #7 wood can transfer heat energy by convection? t/f #8. Radiant energy produces heat en…

Explain how cell respiration along with proteins allows metabolic work to happen. Explain how metabolic poisons affect this system. Can anyone help me answer this question, please????? I need it answered by tonight!!!

-------------------------------------------------------------------------------- A charged object has a mass of 9.11E-31 kg and a charge of 1.602E-19coul. Calculate the strength of the electric field that would provide a force to the weight of the charged object. This is what I have so far F = Ee/m 1.602E-19 * 1.6 E-19 / 9.11E-31 = 2.81E-8 N is this correct

the question is calculate the force (magitude and direction) on the -800nC the -800nC is in the orgin -y axis -200nC and is .02m from th e orgin x axis -200nC and it is .06 from the orgin now i labeled the starting from the -y axis q1, orgin q2 and the X axis is q3 F23 = 8.99E9 * -800E-9 * -200E-9/ .06^2 = .4 N Xvalue F12 = 8.99E9 * -800E-9 * -200E-9/ .02^2 = 3.6 N Y value F = squar root .4^2 + 3.6 ^2 f = 2.07 N the direction tan-1 (3.6/.4) = 83.7 degrees below the X axis are these correct thanks joe

Hello everyone. I am new to the forums and on spring break right now. Except I have some homework and want to get it done ASAP to get it over with. I have some questions that I need help getting them answered. Q1: A motorist's radar detector uses an antenna and circuitry that is turned to electromagnetic waves with a wavelength of about 3.0 cm. Why won't the radar be able to detect the red light from a police officer's laser light system? Q2: A picture on the TV screen is crated when electrons shot form the back of the set strike a special coating on the inside of the screen. Why do you think the face plate glass of a TV set contains lead? Q3: Cancer cells a…

here is the problem...

Hi, I'm new to the board and I need some help with these two questions. 1. Explain why standing next to a warm thermal source is a good way to avoid mosquito bites. 2. Explain why decreases in the zone layer led Canadian scientists to develop a system for measuring the intensity of UV radiation at ground level. The UV index that accompanies most weather forecasts is the outcome of this system.

does anyone know a space term that begins with the letter X? and does anyone have a proper definition for an Eagle Nebula?

1. the formation of chemical bonds in molecules will result in a. the attraction between electrons b. the liberation of heat c. the attraction between nucei d. even distribution of electrons ans is b, but i wanna ask will it result in the attraction between anything, even not between neither the nuclei nor the electrons 2. which of the following statments abt redox reaction is false a. some common oxidizing agent can also be reducing agents in other reactions b. oxidation n reduction take place at the same time c. redox reactions involve electron transfer d. a current can be detected ans is d, i know why d is false, but i think a is not reli correct eithe…

i was asked to find some daily applications related to heat.... are there any interesting and non-common ones? as those common ones were already discussed by my teacher... any gd suggestions? it need not be too complicated... thx!

Any kind of energy is carried by particles,is that right?

The solubility of iron (II) hydroxide, Fe(OH)2, is 1.43E-3 grams per liter at 25 deg C. a) Write the balanced equation for the solubility equilibrium. My answer: Fe(OH)2 <----> Fe [2+] + 2 OH - b)Write the expression for the solubility product constant, Ksp, and calculate its value. My answer: 1.61 E - 14 c) Calculate the pH of the saturated solution of Fe(OH)2 at 25 deg C. My answer: pH = 9.5 d) a 50.0 mL sample of 3.00 E -3 molar FeSO4 solution is added to a 50.0 mL of 4.00 E-6 molar NaOH solution. Does a precipitate of Fe(OH)2 form? explain and show calculations to support your answer. i got to the point where no precipitate will form. 2. Th…

hi there i am a student doing a project on chemiluminescence and need help, there is not very much materials on any aspects except what is being done wiht it, if anyone has any reall info on the history, sceientists current progress in the field or techniques and equiptment involved it would be great if u could share it with me

I have two questions I need help with 1.) If a chemical reaction occurs at a rate of 2.25 10-2 moles per liter per second at 322 K, what is the rate expressed in moles per liter per minute? 2.) Which of the following does NOT affect reaction rate? a.) concentration of reactants b.) surface area of reactants c.) reactivity of products d.) catalysts

I recently had an exam with the following logic problem in Oceanography. It apparently doesn't have anything to do with Oceanography, but rather Physics or Mechanics, I don't really know. It was only for bonus, so I guess the professor is allowed to ask whatever he pleases. Anyway, it is really togging at my brain, and he refuses to answer the question until the end of the semester (no one in class answered it correctly). So here it is: A car is traveling 60mph; a part of the car is traveling 120mph, and another part is traveling 0mph. What are the two parts? Any help would be greatly appreciated as I'm starting to lose sleep over it. Thanks in advance.