Q.A spacecraft is moving past Earth with a velocity of 0.7c. It launches a rocket that moves in the same direction as the spacecraft at a speed of 0.8c. What is the speed of the rocket relative to Earth?
Q. In a physics laboratory experiment, a coil with 240 turns enclosing an area of 11.7 is rotated during the time interval 4.50×10-2 from a position in which its plane is perpendicular to Earth's magnetic field to one in which its plane is parallel to the field. The magnitude of Earth's magnetic field at the lab location is 5.20×10-5 . What is the total magnitude of the magnetic flux through the coil before it is rotated?