Recent content by mishek

Hi Samy_A, big thanks for the reply! When I catch some time, i'll go in that direction and try to solve it myself. But i am wondering, why use logarithms?

Hi Mentallic, Thanks for a quick reply. I know I can use a calculator :), but I would like to know how to solve it in a manner that is given on a photo. There must be some tables that I should use (i assume), but i don't know which one. Also, the value of c in step II, where did that come from?

Hi, Can somebody please point me into a direction how to solve the attached trig problem? First step, where can I find such values for sin (alpha)?Thanks.

Try to calculate moment around point A or B. I don't think your equation tan37° is valid.

Hello, yes, that is what I mean. Consider that rod is rotating about it's end.

Hello, have you considered moment of inertia and Newton's 2nd Law?

This would mean that object is traveling half of the time at speed v1 and other half at speed v2?

Because object starts falling from height H (from rest) where he has initial velocity 0.

Hello, please check attached photo. Does that make sense?

you have two unknowns (T & H), you need two equations. I would make them for two positions shown on a picture (H and 3/4H) by using above mentioned equation: H=Vo*t + 1/2*g*t^2

The problem states that you have a falling object which has one more second to go (last second of it's fall). That means that from that point initial velocity isn't zero.

Are you sure that initial velocity is zero?

This is also what I meant (F=k*x) when asking you what happens when system comes to rest. It's a situation when system is resting, why would you use energy equations? When spring is under influence of E_{k} and E_{p} there is greater compression than when they vanish.

Hello, What happens when system comes to rest?

Isn't the work done equal to the change in rotational kinetic energy: W=\frac{1}{2}Iω^{2}_{2}-\frac{1}{2}Iω^{2}_{1} http://hyperphysics.phy-astr.gsu.edu/hbase/rotwe.html