Recent content by Michael Ngo

Yes, thank you very much sir for helping me also for the additional info. And sorry again for the inconvenience. I'll be more diligent next time.

Oh I'm sorry I've missed the reference note, sorry for my lack of diligence sir.I'll try to be more diligent next time. Also thank you for everyone trying to help

Oh I understand now. Thank you so much sir

Oh I'm very sorry. Well, I suppose in the second experiment the spring will stop as it has descended 2cm, because the spring's condition in the first and in the second are the same. If in the first experiment, it stops at 2cm with a mass of m kg, the in the second experiment it should also stop...

The equation I used for the work done by spring is Ws= 1/2.k.(x initial2-x final2) and for the work done by gravitational force is W= m.g.ΔX Umm, well the problem doesn't said anything about reaching a condition of rest when it strectched 2cm, so I just assume it was in a condition of rest...

Homework Statement I've encountered an answered problem in this book titled, "Physics for Scientists and Engineers with Modern Physics, 9th Ed" by Serway at page 187. So there is a spring which is hung vertically. 1. The first condition was the spring at an equilibrium state (ΔX=0) 2. The...

Oh, i see. So its relative. Thank you sir

Homework Statement There was a plane with the height of 1 km above the ground. The plane is moving horizontally 200 m/s and can fire a bullet with the velocity of 400 m/s. At one time, the the gun form an angle of 37(degree) and fired the bullet. I was confused with the horizontal (x-axis)...