標題: (physics)Equilibrium and stability [打印本頁] 作者: Freedom123 時間: 2010-11-28 03:59 PM 標題: (physics)Equilibrium and stability
A square cardboard of mass 5 g is pinned at one corner.When it is released at the position shown , what is the moment about the pin produced by its weight?
Answer : 0.007N m
show me the steps in detail and in depth , with steps or calculations stated ,either with labels or arrows and the clear steps annotated explicitly. thxxxxx. 作者: henryc0985 時間: 2010-11-28 04:39 PM
Let centre of gravity be G
the position pin as P
PG = 20sin45 = 10sqrt.2cm = 0.1xsqrt.2 m
Moment = Fxd = mg xd = (5 x 10^-3) x 10 x 0.1xsqrt.2
= 7.07x10^-3 Nm = 0.007Nm 作者: hinokari 時間: 2010-11-28 04:41 PM
