The vector ω is the vector representing the angular velocity of the ball. For the diagram shown above, the vector ω would be perpendicular to the plane of the computer screen and coming out of ...

Russia's President Vladimir Putin (right) gives a World Cup soccer ball to US President Donald Trump during a joint press conference at the Presidential Palace in Helsinki on July 16.

Russian President Vladimir Putin gave US President Donald Trump a soccer ball. AP Adidas declined to comment on whether the chip could be a vector of a Russian hack. There is no suggestion that ...