Recent content by astri_lfc

merry christmas too ;) thankyou :D i understand it now!

Homework Statement in a millikan type apparatus, the horizontal plates are 2 cm apart. with the field switched off, an oil drop is observed to fall with a steady velocity of 2 x 10^-4 m/s. when the field is on, the upper plate being positive and the drop just remains stationary when the pd...

Homework Statement could you help me for the question b? Homework Equations E = mc^2 The Attempt at a Solution the mass of the alpha particle is 0.66466 x 10^-26 kg >> 4.022 u put it into the equation, so E = 4.022 x c x c = 3.615 x 10^17 eV >> 0.0579 joule my answer is that, but my...

okay thanks a lot! i have found the answer

oh i see so shall i use q/t= m c deltaT ?

k = 80 A = 1.5 m2 L = 2 x 10^-3 delta T = 6 K q/t = 80 x 1.5 x 6 / (2x10^-3) so q/t = 360000 what's wrong with thiss? :'(

Homework Statement In a domestic heating system, a room is warmed by a 'radiator' through which water passes at a rate of 0.12kg s-1. The steady-state difference between the inlet and outlet temperatures of the water is 6.0 K. The radiator is made of iron of thermal conductivity 80 W...