Recent content by Rival

hehe, that could help if i looked for the right thing. Thanks alot, i really appreciate your help. Kevin:smile:

now that i know the mol wt, i matched it with the periodic table and it comes out to Co, but which one of the choices are Co.

so using the equation you gave me, i have n = 5 and g = 135, so i find Mo, which came out to be 27, and in the periodic table 27 is Co. what element is Co? but i think its wrong...

ok so we have 5 moles but now what? how do we figure out what element it is?

ok so i am guessing that the equation that i need to use is n=N/NA but how do we figure out N?

how?

8. [CJ6 14.P.001.] A mass of 135 g of an element is known to contain 30.1 1023 atoms. What is the element? carbon hydrogen oxyden aluminum This is the question on my Physics practice test for my exam tomorrow. i don't know where to even begin with this one. we haven't really gone over...

A 1.80 kg object is hanging from the end of a vertical spring. The spring constant is 34.0 N/m. The object is pulled 0.200 m downward and released from rest. Complete the table below by calculating the translational kinetic energy, the gravitational potential energy, the elastic potential...

changes have been made...all units have been placed in the appropriate places for my answers kevin:wink:

why yes i can evaluate that integral, or at least i better be able to. seeing how i have finished diff E.Q. last quarter... anyways the equation is just 1/2kx^2 so i have .5(2900)(.058)^2= 4.8778J thanks again...definitly a confidence booster right there =) Kevin

so is it just the kinetic energy in the spring? KE=1/2Mv^2? Kevin

Ah ha! i have F=kx as my equation...F=force pushing down on cylinder and spring F=168.4N k=2900N F/k=x x=.058m ok first part done but still stuck on second part kevin... P.S. thanks everyone and especially Warren

well if i draw a free body diagram of the piston, i will get a force pushing down which would be Atmospheric pressure multiplied by area which is just (pi)(r^2) or in Newtons 168.4. now i sitll have a force of 2900 Newtons pushing up from the spring, correct? or am i wrong there kevin

A cylinder is fitted with a piston, beneath which is a spring, as in the drawing. The cylinder is open at the top. Friction is absent. The spring constant of the spring is 2900 N/m. The piston has a negligible mass and a radius of 0.023 m. (a) When air beneath the piston is completely pumped...