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physics ---- really dnt get this at all

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physics ---- really dnt get this at all
Will the photoelectric effect change for different targets

physics ---- really dnt get this at all
Marks: 3 If the velocity of the particle is reduced by a factor of two, by what factor does the de Broglie wavelength change? Choose one answer. a. 2 b. 4 c. 1/2 d.1/4

physics ---- really dnt get this at all
A 5.00 cm tall candle is placed at a distance of 50.0 cm from a double convex lens having a focal length of 15.0 cm. What is the image distance? Choose one answer. a. -21.4 cm b. 21.4 cm c. 65 cm d. 35 cm

physics ---- really dnt get this at all
A small electric motor is used to lift a 0.50-kilogram mass at constant speed. If the mass is lifted a vertical distance of 1.5 meters in 5.0 seconds, the average power developed by the motor is

physics ---- really dnt get this at all
The third harmonic of a guitar string has a frequency of 170 Hz. What is the length of the guitar string if the speed of the waves on the string is 125 m/s? Choose one answer. a. 1.103 m b. 2.206 m c. 0.368 m d. 2.040 m

physics ---- really dnt get this at all
A total charge of 25 mC passes through a cross-sectional area of a nichrome wire in 10 s. How many electrons pass through the cross-sectional area in 16 s? Choose one answer. a. 2.5 x 1017 electrons b. 2.5 x 1019 electrons c. 2.5 x 1016 electrons d. 2.5 x 1021 electrons

physics ---- really dnt get this at all
if friction is set to zero and on planet Earth. Now, if you attach a mass to the spring from its initial equilibrium position, it vibrates forever in simple harmonic motion. Why doesn't it come to rest after stretching by a distance 'd'; proportional to the weight of the mass...

Physics
is it true or false the monochromatic light has photons of different energies? PLZ DNT 4GET 2 XPLAIN IT

math
i dnt know how to do this can u8 help me

Mrs. SUe
Curiousity; Do you get paid for all for all of this hard work that you do??? BEcuase you are always on helping all students on a ton of subjects.. I really appreciate what you do and you deserve to get paid for all the students you are really helping, without giving them the ...

Physics
Is true or false- a lamp functioning at peak voltage (AC) will glow with the same brightness when connected to a battery of the same voltage (DC)? PLZ DNT 4GT 2 XPLAIN DA ANSWER

PHYSICS-Help required
My physics questions are not on graphs, this is just a practise quiz I'm doing. All the questions I've done so far were not guessed answers, I did my work on a separate piece of paper, all I really had to do was divide. The other questions above that I need help on, cause I ...

7th grade math
Hi! What is the formula of the volume and surface area of cylinders? I checked my textbook and it didn't really say. My teacher didn't really explain at all. If somebody could help explain this it would be really great. Please help! Thank you!

Physics
I have a resistor with a voltage across it and and a current through it that satisfy the passive sign convention. the problem wants me to write three different ways in which the power dissapated by the resistor can be calculcated. i know Ohms law v=ir and watts law p=iv but i ...

physics
I have a resistor with a voltage across it and and a current through it that satisfy the passive sign convention. the problem wants me to write three different ways in which the power dissapated by the resistor can be calculcated. i know Ohms law v=ir and watts law p=iv but i ...

US HISTORY THIS IS URGENT
what was the religion(s) of the people of massachusetts when it was first founded? PLEASE DNT GIVE ME A WEBSITE

French
I am doing a presentation on the efficiency of appliances. I am going to be comparing the past and the present and then France and the US. Do you guys know of any good websites that would talk about any of this. All I can really find is different brands of appliances and then ...

french
I am doing a presentation on the efficiency of appliances. I am going to be comparing the past and the present and then France and the US. Do you guys know of any good websites that would talk about any of this. All I can really find is different brands of appliances and then ...

Thank Jiskha tutors
I really appreciate all that you tutors do for us, I know we may be a bit demanding sometimes XD but we really love how you guys are always there to help us out. Coming from experience, I've had some past teachers that aren't as willing to help us when we do not understand and...

Physics
Cn u plz gv explaination 2 d solutions steps by steps briefly?Cz i really dnt understand hw 2 apply d formula wen i revise it nw. Much appreciated. [g=10 m/s^2 ] a fixed wedge whose smooth sloping face is inclined at 30 degree to the horizontal. A particle A, of mass 2 kg, ...

Foreign languages
I left out this short paragraph. Could you please check it? 1) I really hope everthing is Ok with you. My students are really looking forward to starting the email partnership. I would be therefore be extremely grateful to you if you could let me have all the email adresses by...

math
am having prob..wv zs numb..given that f(x)=x+6/2x,find f(4) and f inverse(x) am not sure abt the answer the frst 1,i get 1.25 and the second oneeee i dnt knw hw to do it

Physics
What do we call the combinations of all forces that act on an object? I really do not know this!

MATH
I get really confused with math . I am great with all of the other subjects . In fact I get all B's except for Math , I get 1's !!! I really need help with it . I ask for help but whenever people help me and put it in the most simplest way possible .. I still don't get it . I ...

us history
what role did native americans play in the French and INdian war? please dnt give me any websites for some reason my computer won't open them up.

i dnt get it
My tens digit is double my ones digit. I am less than 70 and greater than 60

geography,life sciences,maths lit and consumer studies
am in grade 11 so i dnt knw wht career i wnt to do after finished matric so plz help me

Physics
Cn u xplain the solutions steps by steps? Cz i really dnt understand wen i revise it nw. Tnxs u kindly. Two particles A & B are connected by a light inextensible string passing over a smooth pulley P. Particle A, of mass m, lies on a plane inclined at 30degree to the ...

Physics
Is this true or false? All objects moving in a circle are accelerated. I really don't uderstand this question.

Physics
Sorry to double pos, I just really need help whit this. You push an air-hockey puck along a surface with negligible friction while riding in a truck as it moves at a constant velocity in Earth's frame of reference. What do you observe? Why? I'm tempted to say that the puck ...

ingqayizivele high
Am doing math lit ,geography,history n life sciences I dnt knw which career to choice can u plz help me .cal m 4 help on 0625113520 plz

Calculus
I'm studying infinite series and am really struggling with memorizing all the tests for convergence in my book, there's like 10 of them. I don't think I'm going to be successful in memorizing all of them. I will never be asked in my course to use a specific test to determine ...

Accounting, maths literacy, business studies, economics
am doing matric this year so I dnt knw which career I can do next year with those subjects.......plz I need help

Science 7R
contains all the same kind of cell???? what part of a cell is that or something? AIDS???? parts of a animal or plant cells (im not going to list them all because you guys already know) ???? electron microscope ???? tiisue ???? vaccine ???? virus ??? host cell ???? organ ???? ...

explaining the questions
• the contribution of the each individual member; • your recommendation as to how the marks should be distributed among the members. i have to write a paragraph for those 2 and many more...but i just dnt understand what these two are asking...pls help...thanks

Reading
What does this sentence mean? I dnt understand what it is saying As for the Sasanid rule, a well-engrained class system was in place defining from birth whether one would be a priest, warrior, secretary, or commener.

To SraMcJin
Sra, I want to thank you for all your help on my English poetry. You really are good at poetry. Thank you very much, I really appreciate it:-)LOL

math lit ,geography,history,life science,LO
Am in grade 10 and am doing these subjects and I dnt knw what kind of career choice I can choose please guys help me out please

COURSE HELP PLEASE ms sue qq
What course should i really take if i want to be a pediatrician ? COURSE HELP PLEASE - Ms. Sue, Friday, January 31, 2014 at 11:47am You should take all of the hardest courses offered, especially in math and sciences. ================ HI what are those ? really all ? not just ...

physics
Hi, my teacher doesn't teach us too well and we have a few packets to hand in for tomorrow that I really don't understand much of. If someone could give me the answers to all of the problems on the first link if you search "the electrical energy converted to thermal energy in ...

Algebra II-Please help!!
Please help-I'm really mixed up How do I find the permutations of the first 12 letters taken 3 at a time? I have a ton of these to do and really don't understand them at all-

Physics
Please help!!! Physics test!? I have a physics test tomorrow on projectile motion, and I don't feel ready for it. I'm having trouble in the class and I need to ace this test. The problem is I get confused when I get a problem. I don't know how to proceed. After I read the ...

english
kindly please correct my english grammar if it is correct or mistake. how to use the word all. 1.all girls are beautiful. 2.all of them is really has a kind heart. 3.all peaple is good.

Physics (Final Review)
Ok so tomorrow is my Physics final and I have so much depending on this one test ( all my other grades are 80 and above but this one is a low 70). I have studied for the final but if anyone could supply me with a list of most know formulas for physics I would really appreciate...

maths
for tan2x=3 i get should get two values 71.56 and 251.56 but i dnt knw how to solve to get this two values. pls help me with this. thanx in advance.

mathvariation 2(steve,reiny,reed)pls I need help!
pls steve I dnt understand! Explain how d alphabets? Wat are they representing?

science
Please Help me!!!!!!!! i dnt have my science book but there is a question that im stuk on pleaz help!!! Explain why we can only see a full moon only at nite.

Chemistry (really need quick help)
Balance the following equations. (Use the lowest possible coefficients. These may be zero.) (a) As(s) + ClO3-(aq) ---> H3AsO3(aq) + HClO(aq) (acidic solution) I am using half-reactions but I don't really get this at all. Can someone explain?

social studies
i have another question that i dnt understand. its say::::: explain why german, viking and magyar tribes contributed to the fall of the roman empire... nd the second question is why was feudalism adapted in europe in the middle ages????

Physics
Cn u plz gv explaination 2 d solutions bit by bit in brief? Cz i really dnt understand hw 2 apply d formula 2 solve it when i revise nw.Thnkz. [g=10 m/s^2 ]a particle P of mass m kg on a rough horizontal table. The coefficient of friction between P & the table is 1 /4. The ...

calculus
i really need some help, i really appreciate all yalls help. Consider the function F(x)=2x^2-5x+5/x-2 Domain Vertical,horizontal,or slant asymptotes x-intercept(s) y-itercept(s) symmetry(respect to x, y-axis or orgin) F’ (x) Critical numbers F” (x) Possible points of ...

Discrete Math
Use mathematical induction to prove the truth of each of the following assertions for all n ≥1. n³ + 5n is divisible by 6 I really do not understand this to much. This is what I have so far: n = 1, 1³ - 5(1) = 6, which is divisible by 6 Then I really don't know how to ...

Physics
Cn u plz gv explaination 2 d solutions steps by steps briefly? Cz i really dnt understand hw 2 apply d formula wen i revise it nw. [g=10 ms^-2 ] Two particles P & Q, of masses 0.2 kg & m kg respectively, are attached to the ends of a light inextensible string. The particle P ...

College
Does Harvard University have art & creative writing classes cause I want to become a artist & a creative writer (when writing books, short stories, novels, & poems). I'm just asking. I look on the website but it really confusd me. Please also what is REALLY Harvard Uninersity...

chemistry
I have tried virtually everything, i can't fogure out this problem. I have 2K^+ + SO4^2- + Ca^2+ + 2I^- --> CaSO4(s) + 2K^+ + 2I^-. but it is incorrect and i dnt see how, can u help me? Write balanced complete ionic equation for K2SO4 (aq) + CaI2 (aq)CaSO4 (s) + KI(aq)?

Algebra II
Hey all. I'm trying to solve this question, but don't really understand how to do it: If (x^4)^5 = x^a for all values of 'x', what is the value of 'a'? Any help is much appreciated, thanks!

English literarure(a streetcar named desire)
infact my problem is that i dnt know how to start answering this empathy question.Can you please help me??th question is thet; Imagine you are stanley.write your opinion about Blanche (scene 1).please help me.

Math
I need to express the following in equivalent form: m-2/m^2-5m+6 , 2x+6/x^2-6x-27 , a^2+a/a^2+2a+1 , 2w+1/2w^2+2w+1 , 8Z+6Z^2/9z^2-16 I really don't understand how I can do this if the denominator is smaller and I just don't see how I can simplify since I think that's what it'...

Physics 102
THIS IS A QUESTION IN MY PHYSICS BOOK & I REALLY REALLY NEED HELP. I AM 48YRS OF AGE JUST DECIDED TO GO BACK TO SCHOOL AND HONESTLY KNOW NOTHING ABOUT PHYSICS. Two facts: A freely falling object at Earth’s surface drops vertically 5 m in 1 s. Earth’s curvature “drops” ...

7th grade math
i was trying to work out the problem (1.00-x)50/15x. (x=.40g this is the answer) when i work it out i get 50-50x/15x but i dnt understand how this equals .40?? help plse

math
how do u divide fractions? i really need help with this. i need to know all the steps. plese post the steps.i really need them before 9 oclock tonight. please help. thank u very much...

stoiciometry (chemistry)
calculate the theoretical yield of Cu when 53.2g Cu2S react with oxygen. (balanced equation is CU2S+02>2Cu+S02) Please help me figure this homework out. I just dnt get how to get the theoretical yeild. I want to know to be able to do the rest right. Thanks much!

Math - please elaborate
can someone please further explain my question on? it's just a farther bit down. The subject is "Math - help really needed" I think I almost got the answer, but I'm not sure where to go from there. really appreaite all the help so far as well; thank you. :)

PHYSICS (PLEASE READ)
I tried all the formulas i know but i cannot answer it I really need your help in this question.. A projectile was launched 64° above the horizontal, attaining a height of 10 m. What is the projectile's initial speed?

Ksp/Ka Questions-Chem
I really don't understand how to set this up. Any help is really appreciated! I really don't quite understand how to set up a caluculation to figure out whether a precipitate will form and i'm struggling with the second half too! When 25.75 mL of 0.00826 M lead II nitrate is ...

Physics, error derivation
I need to derive an error equation for Bohr's model to use in my physics lab this week. I am really bad at calculus, so if anyone can help me that would be really great. the equation is (1/lambda)=R[(1/n^2final)-(1/n^2initial)] I've never had to derive anything like this ...

physics
may be this is simple and obvious question but i am really not getting this.in my physics practicals i was doing potentiometer experiment ,in this i did not understand how jockey completes the circuit.i mean we did not do any connections we were just touching wires with this ...

Math - I really need help, please.
A town has a population of 8400 i 1990. Fifteen years later, it's population grew to 12500. Determine the average annual growth rate of this town's population. I really don't understand this problem. I've been going at it for hours and all I've come to is that the equation ...

english
In the springtime ,the mosquitoes.really annoy,really aggreate, really irritate

Jishka homework help
ok so this isnt really a homework question but when you make an account on Jishka, not a premium one, but just a regular free one, whats the point? Because all you can do is edit your "profile" which is 3 questions. What really is the purpose of it?

physics, error calculation repost
I need to derive an error equation for Bohr's model to use in my physics lab this week. I am really bad at calculus, so if anyone can help me that would be really great. the equation is (1/lambda)=R[(1/n^2final)-(1/n^2initial)] I've never had to derive anything like this ...

U.S.History
how did the issue of Gold, Glory, and God influence the economic gain and glory for all individuals involved.[involved in the colonizing activities of Spain and England] i really, really need help with this..i have been trying to find the answer for this for a few days. thanks...

Language Arts
23. Respond in a paragraph. Answer is written in complete sentences. Compare the poems by Szymborska and Milosz read over the course of this unit. All are important twentieth century writers addressing a similar theme: death. Which poet addresses it in terms of the times he ...

U.S History
Forming the united States, what were the two plans that arose at the Convention and who were the people responsible for each plan? Just a minute! Have you asked us all your questions? What have YOU done to find the answers? We HELP but we don't DO the work for you! Yes. I'm ...

Taking Time to Thank
I want to thank all the homework helpers who have helped me in the past. Ms. Sue Steve Writeacher Jai I really appreciate all of you guyz helping me out, you improved my grades and i thank you because of that :)

mathematics
evng .my teacher gave me this as a homework but i dnt undertand. 1.In a GP the 3rd term is equal to four times the first term and the sixth term is equal to three times the fourth term plus 32. Determine the sequence.

language
i fixed it as you said, what do you think about my tercet now? The Wild Dog I saw a dog Who walked in the fog He couldn’t see and got stuck in a log. He jumps up high And pretends he can fly Like a super hero in the sky. He’s really really fat He sits on a mat All day, ...

Math
Consider the matrices P = 3 1 1 3 and S = 4 2 2 4 Calculate P^n and S^n for different values of n and describe any patterns you observe. I cannot find any patterns at all. I would really appreciate any help at all. Thanks!

Physics
i really dnt understand wen i revise it nw so cn u xplain the solutions 2 me. Thnks.[take g=10 ms^-2] Two particles P & Q, of equal mass m, are attached to the ends of a light inextensible string. The string passes through a small smooth hole at the vertex of a cone fixed with...

Math
Mathmate, I really appreciate all your help regarding my composite function question below but I'm still in need of your help. I don't understand how the range of x^2-x+1 is R. Isn't this a parabola with a minimum for y? Also, I understand minimum and maximum values of sine ...

geometry
ughh i need help i dnt like proofs we'll here it the instructions write a two column proof the segment addition postulate is useful for this proof also. remember that the transitive && substitution properties are common in proofs this one requires substitution.. given is rs=xy...

trig
It's in sigma notation, so I'm not sure how to type it. I'll just use E lol. Find each sum. 6 E (n+1)/(n+2) n=1 Is this a geometric or arithmetic series? That is pretty much all I really need to know. I appreciate all the help you guys give.

Algebra 2 Could use help asap
I really am trying to work these problems out on my own. Please help If f(x)=3x^2 g(x)= 1/6+x find the following and give the domain (f+g) (x) (3x^2) + (1/6+x) x is all real numbers and x is not equal to 6 (f-g) (x) (3x^2) - (1/6+x) 3x^2-x-6 x is all real numbers and x is not ...

Physics
A cannonball is fired horizontally from a 240 -high cliff toward a vertical building 540 away with an initial velocity of 90.0 . When the ball will hit the building? A) 7.00 s B) 6.00 s C) less than 6.00 s D) more than 7.00 s If it's fired horizontally, then all of the ...

Precalculus
Hello, Thanks for all of the help guys. I really appreciate it. I was woudnering if you could show me how to do this step by step and the thought process that goes through your head while you do this. This way I will be able to try to solve some of these problems on my own ...

Algebra-I really need help, please?
I have to solve sqrt(2x-7) >=5 answers would be x>=16 x>=7/2 7/2<=x<=16 x<=16 I don't get this concept at all and I have 20 of these kinds of problems for homeowrk-can someone direct me how to start or give me an example or just help please? I really need to ...

Business Communications
Which of the following would be classified as an informative or possitive message? A. A request for information B. An announcement of a policy that reduces benefits C. A memo for the file recording actions and rationales D. A letter to an employer announcing you have accepted ...

HELP PLEASE
I'm really, really, really, sorry but I seriously need help. I can't find a TIMELINE of George Vancouver's special journeys and events. PLEASE HELP ME!!! IT WILL MEAN SO MUCH TO ME!

Physics
I have to compare and contrast three types of tires, and relate them to physics. I've chosen: <li> Racing tires <li> Winter tires <li> All season tires I've chosen to compare them on: <li> Tire tread pattern <li> Rubber compound <li> ??? As ...

fluid mechanics
I have got differential pressure from an inclined manometer to be 2.8kPa and density of the fluid is 784kg/m^3. I need to calculate the manometer datum height. how do i do tht?? i already did it using formula pressure=density*g*h but i want ans to be 0.165 meters which i dnt ...

fluid mechanics
I have got differential pressure from an inclined manometer to be 2.8kPa and density of the fluid is 784kg/m^3. I need to calculate the manometer datum height. how do i do tht?? i already did it using formula pressure=density*g*h but i want ans to be 0.165 meters which i dnt ...

fluid mechanics
I have got differential pressure from an inclined manometer to be 2.8kPa and density of the fluid is 784kg/m^3. I need to calculate the manometer datum height. how do i do tht?? i already did it using formula pressure=density*g*h but i want ans to be 0.165 meters which i dnt ...

english!
I have to compare 2 of my short stories AND write an essay and the teaacher has given me the topics to work on. 1)the use of symbols to Convery central meaning 2)The use of settings to Convey central meanings i dnt understand what they're asking. and also what is "to CONVEY ...

11th grade physics
my physics teacher asked the class to find a cool physics topic and write a summary and a reflection on it 1page.... any ideas im really stuck

Physics I for College
a rope that makes an angle of 30 degrees with the horizontal drags a crate along the floor. what must be the tension in the rope if a horizontal force of 40N is needed to drag the crate? please help me. i really didn't understand what my professor told me. he speak so fast. ...

CHEMISTRY
PLEASE HELP I REALLY DO NOT UNDERSTAND THIS YOU DON'T REALLY HAVE TO ANSWER THE QUESTIONS BUT AT LEAST JSUT A LITTLE HINT THATS ALL PLEASE AND I HAVE A QUIZ ON THIS TOMORROW MY TEACHER REALLY CANNOT TEACH 1) what flaws exsit in Dalton's model of the atom? 2) what flaws exist ...

career aw
Can someone plz get a website all about photography for me I really need it for a project that is due tomorrow that my teacher assigned but i need a little bit more about what their daily tasks are?!?!?!?!?!?!? I REALLY NEED HELP!!!!! PLZ SOMEONE!!! THANXS

i really, really, really need help
what coordinate point is the solution to the system? {3x+2y=8 {x-y=1 (2,1) please don't think i just made that up, it's correct. you have to use substitution, when you do solve for x and y, you get: x= y+1 and y=x-1, plug in y for 3x+2y=8 and you get: y=1, then plug in "1" ...

english
hay i really really need help!!! im doing a poem project and it invloves explainig what does "no time to turn at beautys glance and watch her feet and how they can dance"means pleasee help me i really need help:)

physics
What mass of hot water at 70 degrees C must be added to 2000g of cold water at 5 degrees C to raise it's temperature to 20 degrees C? To be honest I really don't have any idea how to do this question. I would really appreciate help, thank you

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