Recent content by v3ra

Consider a situation where we want to combine spacetime diagrams of Alice and Bob, where Bob is moving at a speed of 0.4c to the right (positive x direction). If we draw Alice’s xA axis as horizontal and tA axis as vertical, answer the following questions. What is the equation, written in...

The moles would remain constant... how does this help me?

A balloon is filled up with air to a volume of 1.15 L at 296.5 K.* What does the volume change to if the balloon is taken outdoors where the temperature is 278.4 K and the pressure is half of what it was indoors? V2 = (P1V1T2) / (T1P2) How do I find the initial pressure at 296.5 K if I...

i figured it out myself.

molar concentration

Homework Statement Explain the steps you would follow to make 500 mL of a 0.3 M solution of sucrose (C12H22O11) in the lab. I am not sure where to begin with this problem. Any assistance would be much appreciated.

Ah, yes. This headache was the result of a typo..

I have 2a + b = 2z in that equation. 2a is referring to 2 hydrogen atoms in the first compound of the reaction which I have labeled 'a' and 'b' (literally '1b') is for the single hydrogen atom in the second compound of the reaction. 2z is of course the 2 hydrogen atoms in the last compound of...

If I double those numbers, I will end up with the original a = 2, b = 4, x = 2, y = 3, z = 6 which would keep my formula unbalanced.

Homework Statement (a)H2SO4 + (b)NaHCO3 -> (x)Na2SO4 + (y)CO2 + (z)H2O I gave each element it`s own equation: (1) For hydrogen – 2a + b = 2z (2) For sulphur – a = x (3) For oxygen – 4a + 3b = 4x + 2y + z (4) For sodium – b = 2x I then assigned a number to letter 'a'. My book says...

Yes, but I am not sure if I am doing it correctly. Would a = 420 km/h [N 45 E] + b = 30 km/h [W] equals the resultant? But, when drawing it, at what angle would 30 km/h [W] be?

Hmm.. I am not sure what you mean. I am terrible at this! I don`t know the velocity (the 339 km/h is the answer I am suppose to find) so how would I divide it up?

An airplane has an air speed of 4.20 × 10^2 km/h [N 45° E]. The wind speed is 30 km/h to the west. a) What is the airplane’s resultant velocity? I decided to use the trigonometric solution, but I am confused on how to break the equation down in order to get 399 km/h c2 = a2 + b2 - 2ab.cosC c2...

I understand now. I was, for some reason, completely avoiding the "t2".

Can you please elaborate? How would someone who is approaching the above equation for the first time know to apply such a rule? The first part of the equation contains three numbers that are being multiplied, would all three be represented by "a" in the "a*(b+c)=a*b" or is this rule only...