Questions

A network is nothing but 2 or more computers are grouped together to share information and resources and the that arrangement is called a topology.

Cluster network topology is not a common type.

Rolling friction or rolling drag is the force resisting the motion when a body rolls on a surface. It is mainly caused by non-elastic effects, that is, not all the energy needed for deformation of the wheel, roadbed, etc... is recovered when the pressure is removed.

Another cause of rolling resistance lies in the slippage between the wheel and the surface, which dissipates energy.

Peggy Whitson on 24 April 2017 broke the record for most days spent in space (cumulatively) by a US astronaut. She broke the previous record set by Jeff Williams who had spent a total of 534 days in space.

– Whitson has been currently living and working aboard the International Space Station (ISS), for which she was launched in November 2016 using a Russian Soyuz capsule. At the time of her launch, she had already accumulated 377 total days in space.

– Her mission was recently extended for an additional three months. Now when she will return from ISS in September 2017, she would have accumulated more than 600 days in space.

It is MISSISSIPPI.

In a first, China is planning to send mini-ecosystems — containing potato seeds and silkworm eggs — to the Moon next year, in an attempt to study how the organisms develop on the lunar surface. The 3-kilogramme mini-ecosystem, developed by research teams led by Chongqing University in China, will be sent to the Moon by the Chang’e 4 scheduled to be launched in 2018, authorities announced at the Global Space Exploration Conference. An 18-centimetre-tall cylinder will carry potato seeds and silkworm eggs to be incubated.