解:1)计算功率p速度v=18(km/h)==5 m/sp=F·v=mgsin30·v=200×10×0.5×5=5×103w=5kw2)加速到36km/h需要时间v=36(km/h)==10 m/s由动能定理知,W =由功率方程p=得t==2 (s)3)配套功率p0p0==7.14kw(b)解:1)取AB杆为研究对象画受力图2)列平衡方程求约束力MA(F)=0: FB3a...
(1)2.4×105J;(2)2×103W[详解](1)花岗岩碑石的重力G=mg=104kg×10N/kg=105N起重机对碑石所做的功W=Gh=105N×2.4m=2.
摘要: CA72┐4,MGAg等多种肿瘤标志物在胃癌诊断中的应用陈锡美郁雅娟*附属甘泉医院消化内科(上海,200065)*无锡市纺织产品品种研究所医院(无锡,214001)关键词胃肿瘤;肿瘤标志物;早期诊断分类号R735.2胃癌占我国恶性肿瘤死亡的23%,居...关键词:胃肿瘤 肿瘤标志物 早期诊断 ...
本实用新型属于锂电池技术领域,公开了一种蓝牙耳机用耐高温的锂电池,包括耳机外壳,两个所述第一固定块的一端均开设有第一凹型槽,所述第二固定块的两侧均开设有两个对... 龚永明,周孝智 被引量: 0发表: 2023年 人人都爱锂电池 蓝牙耳机诺贝尔奖2019年度诺贝尔奖最令人意外的,就是化学奖颁给了锂电池的三位...
本平台是一个在电脑虚拟火灾环境中,进行多用户协同操作且具有智能功能的基于虚拟现实的火灾应急处理训练系统.系统可以利用三维技术构建的各种虚拟火灾场合(如飞机,地铁... 陈作聪 - 华东师范大学 被引量: 2发表: 0年 全面提升 网络安全保障水平 近日,信通公司网络安全值班人员段西宁的电脑界面出现一条预警信息,他通...
PURPOSE:To test an integrated circuit having a large capacity ROM mounted therein by a general-purpose integrated circuit tester, by successively storing a plurality of signal trains generated by an internal circuit in a plurality of latch circuits by a change-over circuit. CONSTITUTION:At first, ...
1. Plinth bands sound insulation, preferably intended to be applied on the surface of a wall or vertical surface above the ground plane, comprising a body or structure (1; 1 '') of generally sheet form, flat or curvilinear, finned (2, 3; 2 ', 3' ') at the rear of the baseboard ...
Dense SnO 2 ceramics were obtained by doping with ZnO concentrations varies from 0.5 to 5.0 mol. The obtained powder was isostaticaly pressed to 210MPa in cylindrical shape and sintered from ambient to 1.500°C using constant heating rate of 10°C/min. Densities above 97% were obtained dependi...
Capital & Centric has started the search for a main contractor to transform Liverpool's historic Littlewoods building into a film studio complex under plans designed by Shedkm. The Manchester-based developer is already carrying out enabling work at the site and has completed the demolition of the...