Recent content by moephysics

Homework Statement A pH 9.56 buffer was prepared by mixing 2.00 moles of ammonia and 1.00 moles of ammonium chloride in water to form a solution with a volume of 1.00L. To a 200 mL aliquot of this solution was added 10.0 mL of 10.0 M sodium hydroxide. What was the resulting pH...

Hey I've been studying physics for a while and recently I am taking AP physics and I am good at tackling physics intuitively, however when it comes to describing problems in equations I seem sometimes to have some trouble even although my mathematical skills are pretty good. I just need some...

ooh I see where I made my mistake, I actually tried out what you said before I asked you, however I was getting this weird answer of 90 degrees, which you would get if you tried solving this problem right now, kind of embarrassing but turns out I converted from micro coulombs to coulombs wrongly...

Homework Statement A small spherical insulator of mass 8.00x10^-2 Kg and charge 6.0x10^-5C is hung by a thin wire of negligible mass. A charge of -9.0x10^-5 is held 0.150 m away from the sphere and directly to the right of it, so the wire makes an angle with the vertical (see the drawing)...

umm yea yea i get itt,, thanksss a lot for you help :)

well he's kind of undergoing circular motion so there must be a centripetal force acting on him if he were to go along the crest of the hill without losing contact with it.

it tells me that he has gained enough kinetic energy so that he won't touch the crest at that point

Homework Statement A skier starts from rest at the top of a hill. The skier coasts down the hill and up a second hill, as the drawing illustrates. The crest of the second hill is circular, with a radius of . Neglect friction and air resistance. What must be the height h of the first hill so...

alright thank you very much , i don't know what i would've done without your help:approve::shy:

alright so you mean it that way ok so far so good...

ok so Ro=0.2725Re and deo=3.85x10^8 m so our equation would be somethin like GMe/Deo^2-GMo/0.2725Rer^2=0 ?

umm alright yea sure, so it would be something like this Fnet=GMeMr/Rre^2-GMoMr/Rro^2=0 where Me=mass of earth Mr=mass of rock Rre=distance between Earth and rock Mo=Mass of moon Rro=distance between moon and rock

oh ok yea I see where your coming from,, alright thanks a lot your help is appreciated:smile:,, and oh yea one more thing I've been trying to figure out the distance where this rock was undergoing zero net force,, and for some reason I am not getting any where I don't know why. I mean this is...

wait, but if its zero how does the rock keep moving towards Earth until it reaches an altitude of 700 km :confused:?

ohh yea! I see and one more thing when they say enough speed to travel between a point between the Earth and the moon where the gravitational forces are equal and opposite in direction, could they possibly be hinting that the rock would travel initially at the escape speed from the moon or I am...