Climate change

location: Capital Nairobi, Kenya

Date: February 20, 2019

Description: a man picks rubbish in the Dandora rubbish dump site. In the image, a mass of fog surrounds the man and hangs over the building behind him. Water vapour in the air is more than saturated and condenses into water droplets, which are mainly caused by lower temperature. During the day, the air absorbs a lot of solar radiation, which causes the temperature to rise. From the dim background of the picture, I infer that the photo was taken in the evening, so when the temperature of the air near the ground drops, the water vapour also condenses into fog.

The huge temperature difference during the day causes the fog in this image.

Reference:

https://www.accuweather.com/en/ke/dandora/224736/daily-weather-forecast/224736?page=2

https://www.worldweatheronline.com/dandora-weather-averages/nairobi-area/ke.aspx

Brazilian Jiu Jitsu and Physics

Introduction: Torque is used in Brazilian jiu-jitsu because players can use less force to complete a framing during a match.Through putting force and pressure on certain bones and places of the body, all the while using well placed levers, and fulcrums, can ensure that their technique will win them the fight.

Question 1: Why does Jiu Jitsu follow this progression? (Back ground)

The first step is to put the opponent on the ground so that they have no way to find the initiative to create leverage.Instead, we can use subsequent actions to create leverage and apply force and pressure to the opponent.Get past your opponent’s legs and control their hips and shoulders (or their legs) is helpful for us to have complete control over them. When we have completed the above steps, we have completed the leverage on our opponent.They had to surrender because they couldn’t bear the force we were exerting on them.

Question 2: Why does Brazilian Jiu Jitsu want control?

The reason is that who controls the opponent first in the game means that they have the power to leverage the opponent in advance.