Recent content by christinaa_s

(yes i forgot that this gravity should be negative, thanx! another question i am not sure of!.. QUESTION: A bird takes 8.5 s to fly from position A (va= 4.4 m/s (3 ° S of E) to position B(vb= 7.8 m/s ( 25° N of E) along the path. Find the bird's average acceleration. MY ANSWER...

Thank-you so much for your help! Nrged, you are completely right, I misunderstood the question. It is asking for the "reaction distance" so the distance driven before the brakes were applied, which is at a constant speed. So the equation I use is d = v * t . Also, how do I draw a vector...

QUESTION: An archer shoots an arrow straight up in the air with an initial velocity of 45 m/s [U], it takes the arrow 4.6 s to reach its maximum height. Calculate this maximum height. the α, ∆d, and vi should have arrows over them: MY ANSWER: displacement = ½ [(α ∙ ∆t + vi) + vi + vi]...

QUESTION: An alcohol free driver needs 0.8 s to stop after seeing an emergency. A person who has had 4 beers need 2 seconds, a person who has had five, need 3 seconds. If driving at speed of 17 m/s, find the reaction distance (after seeing emergency, the distance traveled before pressing...

i read the webpage, it was helpful thanx.

hootenanny: i still have absolutely no idea how you can get 5, from adding 3 and 4. if you draw a line connecting the beginning to the end, i just don't get it! i am definitely missing something. however i understand how you could get five if you use the pythagoream theorum (sp) to solve...

thanx for both your responses. rdt2, i understand the second question, the final displacement, if u go 3m east than 3m west, you are back in the same place, making the sum o if u add them together its (-3) + (3) leading to 0. but if u go 3m (east) and 4m (north) , how do you get the...

just a quick question, I've never dealt with vectors before, they say you are simply supposed to add them, the same way you would add any two numbers, ie: a + b = c yet whenever they add two vectors, they end up with a different sum.. ie: 1m + 2.5m = 7m this seems so simple, what am I...

QUESTION= a bird takes 8.5 s to fly from position A to position B along the path. determine the bird's average acceleration. va= 4.4 m/s (3 degrees S of E) -- is this the initial velocity? vb= 7.8 m/s ( 25 degrees N of E) -- is this the final velocity? THIS IS WHAT I GOT SO...

thanx Thank-you for your help. The website was ver y helpful. These are the two answers I got. I am not sure about the second one, could you check to see if its right. a) SO3(-2) + MnO4(-) + H(+) <--> Mn(+2) + SO4(-2) + H2O(l) =5H2O + 5SO3-2 + 2MnO4(-) + 16H+ <-> 8H2O + 2Mn(+2) +...

a half-cell balancing question i really need help with this question. There were about 7 equations that i have to balance by using the half-cell method. I have already finished most of them fairly easily, but these two, i am stuck on. I have been rewriting these 2 equations for the last 7...

:) thank-you for the suggestion i will definitely look for that textbook. For one of the questions I have to draw structural formulas for all the alcohols with the molecular formula of C5H11OH, and give two uses for each type of alcohol, as well as write how they were prepared. When...

thanx My independent learning course is at an academic 12 level, and the textbook is Foundations of Chemistry, Second Addition, (Harcourt) I have not been introduced to the rearrangement of Carbocations in this course. As well we have not been introduced to esterfication, but i will look...

2-butene and 1-butene reactions with HCl This is another question from my independent learning course: When 2-butene reacts with hydrogen chloride gas, only one product is detected, whereas when 1-butene reacts similarily, two products are usually found. Explain this. I don't...

Write balanced equations to show the formation of each of the following compunds: a) butyl propanote b) propyl methanote I am doing a horribly constructed independent learning course, they offered absolutly no information on this topic, and then asked me to solve this question.. I really...