GPS

Q.

What is the device that determines position, time and path of objects on earth using satellites?

1. Wireless Fidelation(WiFi)

2. Global Positioning System(GPS)

3. General Packet Radio Service(GPRS)

4. Global System for Mobile(GSM)

Q.

Objects detected by radar are plotted in a coordinate plane where each unit represents $1mile$. The point $(0,0)$represents the location of a shipyard. A cargo ship is traveling at a constant speed and in a constant direction parallel to the coastline. At $9A.M.$, the radar shows the cargo ship at $(0,15)$. At $10A.M.$, the radar shows the cargo ship at $(16,15)$. How far is the cargo ship from the shipyard at $4P.M.$? Explain.

Q. what is the role of theory of relativity in the working ofGPS (global positioning system) ?