Recent content by victoriafello

thanks for pointing that out, i have drawn a picture of the wire and i can see now that the current is clockwise, so i think that the current in the other wise also needs to be into the page otehrwise they will cancel, the next part of the question is - Consider a general point on the...

wire 1 has a current of 1A directed into the page, wire 2 is 20 cm to the right of wire 1 with a current of 1A, what direction does this current have to flow in order for the magnetic field strength at the mid point between them to be non zero ? from the right hand rule the mag field from...

Thats ok, Thanks for all the help :approve:

why does that matter - I'm 14 ? so i make mistakes isn't that why i asked for help, if i knew the answer i wouldn't be here would i ? thanks for the help (and making me feel bad) anyway

ok i follow that, sorry for all the mistakes but i am only learning ! Now I need to get i1 so if I use E2 20i1 – 9 – (5*-0.2) = 0 20i1 – 9 – 1 20i1 – 10 = 0 Add 10 20i1 = 10 Divide by 20 So i1 = 0.5A And therefore i3 = i1 + i2 0.5A + -0.2A = 0.3A i have checked...

Ok so rearrange -35i2 = -7 i2 = 5 then substitue to find i1 10i1 + 1 - 15*5 = 0 10i1 -59 = 0 i1 = 5.9 ? i3 = 10.9 i am really confusing myself now,

The left hand loop is clockwise running EFAB the right hand loop is counterclockwise running DABC ok if i use the above equation then i get stuck trying to find a value for i1 4)-10i1 + 1 - 15i2 = 0 equation 2 - 4 20i1-9 - 5i2 = 0 -10i1 + 1 - 15i2=0 10i1 + 10 -20i2 = 0...

Calculate the current in each of the resistors and indictate the direction of current flow. what is the potential difference between A & B I have attached the circuit & labelled the the circuit directions using kirchhoffs laws - 1) i3 = i1+i2 FOR THE LOOP AFEBCD 2)...

ok so charge on a proton = 1.602x10^-19 C charge on a neutron = 0 so total charge on the zinc is 30 x 1.602x20^-19 C = 4.806x10^-19 for the alpha particle 2 x 1.602x10^-19 C = 3.2x10^-19 C now i need an equation for distance, this equation looks the closest ? Eel =...

An alpha particle (made of 2 protons and 2 neutrons) with initial kinetic energy of 1.20 × 10^-12 J travels directly towards the nucleus of the stationary zinc atom The nucleus of a zinc atom contains 30 protons and 35 neutrons, and has a diameter of 4.00 × 10^-13 cm. The alpha particle slows...

Ok thanks for that, So i have mass of one atom = 20amu so this is m. how do i work out the number of moles or the mass of a mole of particles ? sorry for all the Q's but i never really did any chemistry so never learned any of this before now

ok thanks for the hint so most probable speed equation is - Vmp = SQRT (2kT/m) k = boltsman constant 1.38x10^-23 but i saw this as an alternative form of the equation which was Vmp = SQRT (2RT/M) where R = molar gas constant how do i know which i use as both are in the book ?

I have read that chapter and this is what I think I should be doing? E = 1/2mv^2 / 2 So if I use this equation putting in the figures for mass of the neon atom (20amu) into m and maximum distribution speed 500ms into v1 this will give me E, I guess I would convert the units for mass as...

Ok i assume that helps for the second part of the question, but how do i use that before i know the temperature ? if anyone can give me a hint i would really appreciate it, i keep going thru my book but i can't find anything to help - I am sure its there i just need some advise

A power station is supplied with water from a reservoir. A pipeline connects the reservoir to the turbine hall The flow of water through the pipeline is controlled by a valve which is located exactly 500 metres below the surface of the water in the reservoir. The pipeline is 0.30 m in...