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What is a j3 Cub worth?


What is a j3 Cub worth? Vref, the AOPA partner offering aircraft value estimates, suggests a base retail value for the Piper Cub J–3 of $22,800 for a 1939 model…

Is a positron positively charged?


Is a positron positively charged? Positrons are antimatter, that is, positively charged beta-rays. Having a positive charge, they are attracted to negative electrons but repelled by atomic nuclei. They undergo…

What is virtual positioning system?


What is virtual positioning system? Generally, VPS uses computer vision to accurately estimate the position of a user's phone. The system combines the phone's sensors and cameras with software, with…