Read More
Date: 1-1-2017
2064
Date: 30-12-2016
3070
Date: 1-1-2017
2224
|
Energy in SHM
We found before that the potential energy stored in a spring is and the kinetic energy is . The conservation of mechanical energy says that
where the total energy is
That is
Thus E is constant. However for a spring x and v are always changing. Can we be sure that E is always constant ?
Example For SHM, show that the total energy is always constant even though K and U always change.
Solution Recall that for SHM we have x = xm cos t and v = -xm sin t. Thus
and
Thus U and K always change. Let's add them.
but we previously found that giving
which is always constant because the amplitude xm is constant!
|
|
"عادة ليلية" قد تكون المفتاح للوقاية من الخرف
|
|
|
|
|
ممتص الصدمات: طريقة عمله وأهميته وأبرز علامات تلفه
|
|
|
|
|
ضمن أسبوع الإرشاد النفسي.. جامعة العميد تُقيم أنشطةً ثقافية وتطويرية لطلبتها
|
|
|