Aproton(mass1.6726×10−27kg)andaneutron(mass1.6749×10−27kg)at rest interact to form a deuterium nucleus (heavy hydrogen).In this process,a gamma ray (high energy photon) is emitted.The energy of this gamma ray is measured to be2.2MeV≡2

Aproton(mass1.6726×10−27kg)andaneutron(mass1.6749×10−27kg)at rest interact to form a deuterium nucleus (heavy hydrogen).In this process,a gamma ray (high energy photon) is emitted.The energy of this gamma ray is measured to be2.2MeV≡2 大一物理题.A uniform steel rod of length 1.20 m and mass of 6.40 kg has attached to each end a small ball of mass1.06 kg.The rod is constrained to rotate in a horizontal plane about a vertical axis through its midpoint.At a certain instant it is 有没有英语好物理又好的达人帮我看看题目怎么做?For an isolated system,the centre of mass1.always moves with constant acceleration regardless of the motion of the individual particles.2.always moves with constant velocity regardles 我要定做小份的橡胶,哪里可以做我提供橡胶成分,和制作方法,哪里可以做?成分如下：Ingredient parts by mass1.Natural rubber(SMR L) 100.02.zinc oxide,class B4c(see ISO 9598:1995,annex Da 50.03.N-Isopropyl-N`-phenyl-p-pheny 6726分钟等于几天 某卫星绕地球一周114min,绕59周要几分钟,比5天时间长些还是短些?114*59=6726min5天=5*24*60=7200min 为什么要乘以60？另外：4.67天等于多少天？ 1 1 1 1 1 1 1 -1 1 -1 1 1