Recent content by 626

:) sorry but what do you mean "center of mass". unfortunately, the values stated are the only variables given in the problem. so how do I calculate/find the center of mass? :) btw, i think the rotor and pinion can just be considered as two masses joined together by a spring and subjected to...

By the way, this question was part of a ME competition questionnaires held in our office in Tokyo. A bit tricky in my own opinion. Another tricky question: Problem: A 2200kg rotor is connected to a 150kg pinion shaft by a coupling with an axial spring stiffness of 7.06x10^6N/m. What is the...

Yes you're absolutely right. So the best translation would be: "When a weight with a mass of m1 was placed on the plate, the spring lowered by a total length of a."

By the way, this question was part of a ME competition questionnaires held in our office in Tokyo. A bit tricky in my own opinion. Another tricky question: Problem: A 2200kg rotor is connected to a 150kg pinion shaft by a coupling with an axial spring stiffness of 7.06x10^6N/m. What is the...

Yes perhaps. But the simplest explanation that I can think of is that there was a mention of a small plate attached to the lower end of the spring. So assigning a mass of mo to this plate makes sense. "When a weight with a mass of m1 was placed on the plate..." so the deflection (a) is really...

sorry, just got it. mo should be assigned in all equation including the first one (f=ma) F=(mo + m1)g Thanks for the help, I was able to get the exact solution using Doc Al's advice.

Thanks but in that case result would be: m = m1 [(T2-To2)/(4∏2a/g)] still different from the expected answer of: m = m1 [(T2-To2)/(4∏2a/g - To2)] or am i missing something?

My Solution: 1. for the mass of m_1{}, elongation is a; F = m_1{}g but F = ka so: k = m_1{}g/a 2. for the mass m which give a cycle of T T = 2∏ √(m/k) therefore: m = m_1{} [T^2{}/(4∏^2{}a/g)] Expected answer: m = m_1{}...

Sorry for such a simple question. Unfortunately, this problem was originally written in Japanese and was just translated in English by a coworker. I don't know if there was a problem during the translation but we cannot produce the same answer as was shown in the Japanese answer key. Problem...