Recent content by Kyoma

Let's us ignore point masses. So, I presume you're saying that if I have two masses, m1 and m2, whereby m2 is significantly larger than m1, m1 will move towards m2 whereas if I have two masses of equal mass and assuming no other external forces, they will not move towards each other?

Homework Statement This picture represents the gravitational field lines for a pair of masses. The problem I have with this picture is that it seems to indicate that the 2 masses would not move towards each other, which is surely wrong since gravity would cause two masses to move towards...

Homework Statement Find n. 5a + 10d = 26 5a + 5/2(n-1)d + 5/2(n-5)d = 726 n/2(2a + (n-1)d) = 10904 Note that a and d are unknowns as well. 2. The attempt at a solution It is extremely tedious to calculate by hand. Furthermore, my calculator is only able to solve both linear...

Thank you for your replies. But actually, I would like to ask why wouldn't the Earth move closer to the Sun? Since there is gravitational pull by the Sun on Earth, wouldn't Earth move closer to the Sun and be destroyed by the latter?? Is it due to the Conservation of Angular Momentum that is...

Hello. Why wouldn't the Earth gravitate towards the Sun? I have done some online research on this question and it appears that the reason is due to the Earth's rotation. I am not convinced and see no reason why that should be the reason. According to the Rutherford's model of the atom, an...

Ah~ there are 3 H atoms and one pair of lone electrons around N. Steric forces? The explanation given to me was electronegativity?

Homework Statement 1. What is the molecular shape of Hydrazine N2H4 w.r.t. N atom? 2. H2S and H2O, which one has a larger bond angle? 2. The attempt at a solution 1. Trigonal Pyramidal is the answer given. But Hydrazine has 5 atoms around its central atom and I'm unable to fathom...

Homework Statement At sea level, an inflated bicycle tyre has an internal pressure of 600kPa. The atmospheric pressure is 101kPa at sea level. (1 bar = 100kPa). The question is: why won't the tyre burst? There is more pressure in the tyre, thus more force?

Economics: The Law of supply states that there is a direct relationship between price and quantity supplied, ceteris paribus. That is to say when all other variables are held constant, when price increases, quantity supplied also increases. But from my common knowledge, when quantity supplied...

85 mL? But I remember that particles can fit into small spaces, so surely 85 mL is wrong?

Homework Statement 15 cm3 of 0.200 mol dm-3 sodium hydroxide solution was made up to 100 cm3 with 0.120 mol dm-3 sodium sulfate solution. Determine the molar concentration of sodium cations in the resultant mixture. 2. The attempt at a solution Moles of sodium ions in sodium hydroxide =...

Homework Statement Is it true that all quadratic equations (ax2+bx+c) can be factorised into this form: (ax+b)(cx+d)? I think so, but I'm not certain.

Isn't ammonia alkaline? I read wikipedia and it says that ammonia will self-ionise to form ammonium ions. I don't get it.

So there will be a salt and water.. neutralisation occurs so no colour change?

Ammonia has low pH?