задача

Напряжение , измеренное вольтметром ,U=220 B. Определить амплитуду напряжения. Umax

Siber (China) Electric MFG.Limited was established in 1999, focused on a variety of electronic switches, power sockets,lamp holder, electrical and mechanical switches, connectors,R & D, design and production and sales of products are widely used in household appliances, lighting fixtures, industrial machinery, automatic control, electronics, instrumentation, communications, audio and video and medical devices etc. All products have passed CUL, VDE, TUV, CE, CQC, PSE, etc. certification. We have implemented the ISO9001 management model and obtain the relevant certificate, the vast majority of products are in line with the SGS environmental protection test. The Company's administrative headquarters in Hong Kong, responsible for overseas markets; located in Guangzhou, China Marketing Center, responsible for marketing sales and service in the Greater China region with manufacturing facilities in Shanghai, Suzhou, Foshan, Ningbo. All production area is the sum of nearly 100,000 square meters, more than 1,300 employees. And equipped with CNC machining centers equipped with advanced testing equipment. From product design, mold manufacturing, injection molding, metal stamping, assembly inspection, all within the factory to ensure the quality of the product, and can meet customers' increasingly urgent delivery. Such as Lamp holder with delivery within 1-2 weeks, . Our professional and well-qualified young technology backbone are forming a powerful and strong technical team in the field of switches and lampholders,which have a strong development capability to ensure that the capacity for sustained development. "Honest and trustworthy, win-win" is our motto "Dedicated service, quality first" is our executive guidelines. We continue to hold banner of scientific and technological innovation, to create more affordable products satisfied service for our respected customers!CE certification rocker led switches website:http://www.waterproofswitchesfactory.com/ website2:http://www.microswitchesmanufaturer.com/

2017 high quality High end DIY blizzard survival bug out bag essentials Made of waterproof 600D Oxford cloth, durable, durable, suitable for any event, suitable for travel, hiking, cycling, mountain climbing and so on. These bags are brought on belts and clips to ensure that items are placed in the backpack during any activity, safety and closures. This durable backpack, large zipper, nylon strap and plastic clip. This backpack has a lot of capacity to meet your daily needs. Material - This military tactical backpack is made of water resistant 1000D Oxford cloth, high strength and durable. Ergonomic design: the back of a flexible pad, effectively alleviate the pressure of the spine. Shoulder design has the principle of shock and sweat dissipation. Suitable for long-term use.Bug Out Bags website:http://www.waterproofbagsupplier.com/bug-out-bags/

Если растягивать пружину силой 10Н,её длина станет равной 16 см.Если растягивать её силой 30Н,длина пружины станет равной 20см.Какова длина недеформированной пружины?