Seconds Definition and 119 Threads

If a coulumb is defined as the amount of charge carried by a current of one Ampere in a second, why is its units Amperes seconds and not Amperes per seconds?

Homework Statement In this problem, take g = 10 m s-2. A uniform plank of length 14 m long and mass 20 kg is being supported at B and C as shown above. Two boys X and Y of masses 20 kg and 50 kg respectively are right on top of the supports. X starts to walk towards A and Y walks...

How does the solubility of BaSO4 in a solution of Na2SO4 compare to its solubility in pure water? I said that it is greater in the water. I don't know if I'm right, or how to explain it however. I see that if those two compounds reacted, then the products would be the exact same as the...

1. A capacitor where C=1X10^-5 F and R= 1X10^6, there's 1000 electrons on the plate at t=0. How would I find the number of protons after 2 seconds? 2. half life= .7Tm, mean life=RC [b]3. I put the R and C values into get the mean life and got an answer of 7 seconds, and than to...

I have this problem I just can't figure out. Current = A (Ampere) i(t)=z(e^t/(RC)) where z is the initial current at t=0, R is the resistance in Ohms and C is the capacitance expressed in secondary units as F (Farad) - Express the units of F in terms of seconds and ohms So, this...

Hello, I need to find the pressure of a substance after 65 s. I have the initial pressure, the order of the reaction, the Temp., and the rate k for the decomposition. I know that if it was about concentrations, I would use ln [A]t = k x t x ln [A]o If it's about pressure, do I use the...

Last night I played around a bit with my small bresser skylux telescope (70/700 refractor) in combination with a ToUcam pro II webcam. I made a mosaic of the moon out of 7 separate AVIs which were stacked in registax. The seeing wasn't very good (it's been quite warm here in Holland lately!) and...

(from rest) I need to find how far a particle travels in 9 seconds The only given is acceleration but I can find the antiderivative for velocity and position.a = 1 + 3 sqrt(t) mph/sec v = t + 2t^(3/2) + vo mph s = 1/2t^2 + 4/5*t^(5/2) + vo*t + so miles 9sec == .0025 hour \int_0 ^{0.0025}...

Hi, I'm a middle school student who enjoys astronomy and I volunteer at a local science center. At that science center I have no trouble answering questions about the visual aspect of astronomy, but I do run into some trouble when I am asked about the "techy" or mathmatical side of the science...

according to the BB theory, in the first millionth of a second the universe expanded at a rate many times greater than the speed of light, apparently it was able to do this because of the lack of phsical laws, if this is true how do we know that a millionth of a second was in fact a millionth of...

In this article it states that, a decapitated head can still be alive up to 10 seconds from removal from the body, and in some cases the practice was stoped on humane reasons, and that animal heads have been transplanted, the article is from wiki so i guess it is well researched, in the light of...

I have a problem which is a kangaroo jumps to a vertical height of 227 cm. how long in seconds was the kangaroo in the air? so far i have 2.27m=0+1/2 (9.8)t^2 = 2.27=4.9t^2 ~ 4.9/2.27= 2.15859, and then i took the square root of 2.15859 and got 3.89 m/s. could you please tell me what i did...

A ball is droped from a stadium.It hits the ground 2.29 seconds later.How high is the stadium?Do I use this equation?.5at^2(Thant is wrong isn't it?) How fast is the ball going when it hits the ground?(what equation do I use on this one?)

Alright. Now, I understand that the Sun is 1/2 way through its complete H-He fusion cycle, and I realize that after this fusion cycle, it will pass through all the elements until Fe, (i don't know whether it passes through each element in 7 seconds, or it takes 7 seconds for each element). My...

Hey if anyone could please tell me how to do this it would be a great help. ok the question asks about an accelerating car. The mass of the car is 1200kg. When the engine is floored it creates a constant forward force of 9600N. The drag created by the car is equal to this equation: D=160v...

hye this might b a stupid question to ask here but how would one convert seconds to nanoseconds on a calculator? a program for TI format would answer my question (if u know how) or just an equasion Thanks Adam

could you check this? AB(g) → A(g) + B(g) Rate = k[AB]^2 k = 0.2L/mol∙S How long will it take for [AB] to reach 1/3 (one third) of its initial concentration of 1.50M? What is [AB] after 10.0 seconds? 2nd order overall reaction so: part A 1/[A] - 1/[A]o = (k)(t) 1/0.5 -...

the question what is the average acceleration of a car that goes from rest to 69 km h in 9 seconds; don't i use the formula a = vf-vi over t vf - 59 / 9 what is the correct final answer 16.5 km

I noticed something I accidently double clicked the post button and it send you must wait 30 seconds before posting again is this permanent or will we see that good old "you must wait 60 seconds before posting again!" sign?