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# Can somebody help me with physics?

Topic: Can somebody help me with physics?
June 16, 2019 / By Camryn
Question: i have a physics packet due monday and i really dont understand how to do a problem...im not sure if i should distribute the equation or not..i dont have a textbook yet because school just started so i really need help! :) heres the problem: delta x= (Vi + Vf)t solve for V1 Vf and t

## Best Answers: Can somebody help me with physics?

Amalee | 5 days ago
i have physics next semester but i'll try... delta x = (V1 + Vf)t delta x /t= V1+Vf delta x/t -Vf = V1 delta x= (V1+Vf)t delta x/t = V1+ Vf delta x/t -V1= Vf delta x/ (v1+vf) = t just guessing.
👍 98 | 👎 5
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Originally Answered: I am so pissed today! -.- My physics lecturer said physics is physics and totally unrelated to chemistry!?
You're wrong. Chemistry has to do with the exchange of electrons. There are no chemical reactions in the propagation of sound. And so what that all sciences are related by being sciences? By that logic you should have equally introduced exobiology. Grow-up, don't be a dick and maybe you won't waste the chair you've been assigned. Edit: Yes. It isn't chemistry without chemical reactions. Just like it isn't soccer without folks to kick the ball around. You're free to disagree. You're a bit more constrained on being right. Edit: The history of chemistry is not chemistry. It is history. That they teach it in chemistry classes doesn't make it chemistry. If your chemistry teacher is worth his NaCl he would also correct your grammar and syntax if you handed in a paper as atrocious as you current posting. That won't turn it into chemistry; it's English, just in case you were wondering what it would be. Your point is wrong because you listed chemistry as one of the factor that influence sound wave. You then compounded the error by listing physical elements of the cause, "… the particles gain more energy during the days(where got sunlight) and thus moving actively… " rather than a chemical cause. And chemistry has nothing to do with it. There are no chemical reactions and that is all chemistry is about. It's not even about the protons and neutrons you mentioned. That's nuclear physics. (Ion are chemistry: chemistry, like beauty, is only skin deep.) Analogy is a time tested learning aid. The relative elements of the former argument fit the latter argument. Oh my! I used the word "element" in the antepenultimate, penultimate and now the ultimate paragraphs. They must be chemicals instead of paragraphs. .
Originally Answered: I am so pissed today! -.- My physics lecturer said physics is physics and totally unrelated to chemistry!?
Of course all fields of science are inter-related, but your lecturer wasn't questioning that. What he said was that what you were talking about (the way sound travels in air) is physics, not chemistry. he was right, it has nothing to do with chemistry because (a) there are no chemical reactions taking place and (b) the same thing would happen in any gas, irrespective of its chemical composition. And actually you were wrong, the way sound travels in air is exactly the same during the day as during the night, it's just the speed that changes. Sound travels faster in warmer air because the molecules are moving faster so the sound wave energy gets carried from one molecule to the next faster.

Wainamoinen
If this is all there is to the question, they're not asking for an actual solution. What they mean is to set up the equation to solve for the given unknown. For instance this is now set up to solve for δx. I will work one example for you, then you should be able to do the other 2. δx= (Vi + Vf)t To solve for Vi δx= (Vi + Vf)t δx= Vi×t + Vf×t Vi×t = δx - Vf×t Vi = (δx - Vf×t)/t = δx/t - Vf
👍 30 | 👎 -2

Royston
Δx = (Vi + Vf)t Solving for Vi, you would do this: Δx = (Vi + Vf)t Δx = (Vi)t + (Vf)t Δx - (Vf)t = (Vi)t (Δx - (Vf)t)/t = Vi Solving for Vf, you would do this: Δx = (Vi + Vf)t Δx = (Vi)t + (Vf)t Δx - (Vi)t = (Vf)t (Δx - (Vi)t)/t = Vf Solving for t, you would do this: Δx = (Vi + Vf)t (Δx)/(Vi + Vf) = t Hope this helps!
👍 26 | 👎 -9

Originally Answered: A Physics thought on gravity. help. (not homework ^_^), for Physics Majors/Enthusiasts?
The earth's mass and gravity actually increases with time due to rocks, dust falling from space as meteors, etc. this is in the amount of tons, and far offsets the amount lost via spacecraft. some simple arithmetic that you should have done before you panicked: 6×10^24 kg is the mass of the earth If you added or took away 10000 kg every year (a lot), then how many years would it take to change the mass by 1%? 1% of 6×10^24 kg = 6×10^22 kg 6×10^22 kg / 10000 kg = 6×10^18 years, which is longer than the life of the universe. By far.

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