I need some help!! i have two things i'm stuck on and i really can't get my head around them. i have done a pendulum experiment using a 1m rule hung over a point using an inverted v shaped piece of string, i have calculated the period and have been given this equation to relate period T to perpendicular height h, T^2.h=4pi^2/g(h^2 + k^2) k is a constant and g is acceleration of free fall. i need to draw a suitable graph to find g and k The other question is, ice of temp -10 celsius is dropped into a glass of water at temp 20 cesius, what is the temperature eventually? i have the respective heat capacities and the latent heat of ice, i also know i have to use Q=mc delta t from -10 to 0. i think i have to use Q=ml after that but i don't know how they relate and if i have to goback to the original equation after 0 celsius? please please help i just don't seem to be getting anywhere, thanks, Dan.