Recent content by IamMoi

Homework Statement A sample of aluminum oxide, Al2O3(s), contains 8.29*10^25 total atoms. Calculate the amount in moles of aluminum oxide in the sample. Hint: This is a two-step problem. Calculate the number of formula units first.Homework Equations N=N × N_{A} The Attempt at a Solution...

Homework Statement will it have a reaction? Homework Equations Equation: Pb(NO3)2 + Cu --->? The Attempt at a Solution Pb(NO3)2 + Cu ---> Pb(NO3)2 + Cu ------ Cu(NO3)2 + Pb

yes, i tried to do it like in part a) but i did not get the right answer.. the right answer is 6.24 m

oh sorry,your right, i typed it wrong.. that's my problem, i always have two unknown variables whenever i used different formula..

Homework Statement A 0.170 kg hockey puck is initially moving at 21.2 m/s [W] along the ice. The coefficient of kinetic friction for the puck and the ice is 0.005. (a) What is the speed of the puck after traveling 58.5 m? ans: 21.1 m/s (b) After being played on for a while, the ice becomes...

oh... Thank you :smile:

they both cancel

ohhh... is it because the maximum static friction will be equal to the net force?

Acceleration for the first person: a=μg = 0.52*9.8 =5.096 m/s^2 Acceleration for the second person a=μg =0.66*9.8 =6.468m/s^2

you will slide?

you cannot exceed the maximum.. will the solution be like this ... force=mass*acceleration Ff=μmg F=m*a Ff=F μmg=ma a=μg?

does that mean that velocity at this point is 0?

Homework Statement Two people start running from rest. The first person has a mass of 59 kg and is wearing dress shoes with a coefficient of static friction of 0.52. The other person is wearing running shoes with a coefficient of static friction of 0.66. Explain why we do not really need...