Recent content by NOP90

Homework Statement What is the solubility (M) of PbCl2 in a0.15M solution of HCl? The Ksp of PbCl2 is 1.6*10^-5 answer is 7.4*10^-4 Homework Equations Ksp= [Pb] * [Cl]^2 The Attempt at a Solution Like the other question I posted I need help with the working. I tried 4x^3 =...

Homework Statement The Ka of hypochlorous acid (HClO) is 3.0*10^-8 at 25 degrees C. What is the % ionisation of hypochlorous acid in a 0.015M aqueous solution of HClO at 25 degrees Celcius The answer is 0.14 Homework Equations -log[H+], n = cV, pH = pKa + log (base/acid), x/y*100=%...

I'm a bit confused with that. So the length of string is 0.33m. Do I calculate 0.33*cos(-30deg.)? What does the comma between rcos(-30deg.) and rsin(-30deg) represent? Do I use both calculations? Do I also calculate what is on the right of the = ?

Sorry mate, it's 0.33m, originally 330mm but I am working in SI units.

hmm so 6/4 gives 1.5 but still not sure how this came about. Is it that kinetic energy is 0 at 10m and then when it reaches the ground it's kinetic energy is 10, it doesn't stop here however and continues sliding upwards of 4m. 10 - 4 then gives the kinetic energy at point B (6) seeming an...

Homework Statement Small ball fastened to a piece of string 0.33m in length. The ball is displaced by 60 degrees from the vertical. What is the height of the ball at this point?Homework Equations sin? cos? tan?The Attempt at a Solution This is part of a bigger physics question in which I need...

Don't I need a mass to work out PE (PE=mgh)? Also, it's the equations that I am having trouble with, so when you say find them (how??). The booklet covers questions from energy and momentum. So I guess it's just energy, sorry. Thank you for your welcoming :smile: the object slides from point...

Homework Statement Point [A] is 10m above ground and slopes down to the ground and then back up to point [B] which is 4m above ground. Assuming that the object starts from rest at point [A] and that the slope is frictionless, calculate the ratio of the kinetic energy to the potential energy...