What is true when it comes to the concept of FLOATING FREE inSPECIAL RELATIVITY, choose one of the three alternatives each fora) - d)
a) AN OBSEVER NEEDS ACCESS TO (1. His own watch (wrist-watchtime) - 2. All synchronised watches in ALL Free-Float Frames - 3.All synchronised watches in ONE Free-Float Frame)
b) A TEST-PARTICLE (1. Has zero mass - 2. Generates neglectablegravitational field - 3. Is a standardised particle(SI-standard)
c) FREE-FLOAT FRAME IS USED BECAUSE (1. It makes gravitystronger - 2. It makes gravity weaker - 3. It makes gravity”disappear”)
d) A FREE-FLOAT FRAME NEEDS TO BE LOCAL BECAUSE (1.Gravitational field can be different in different places - 2. Toprevent zero effect on tide (high/low water) 3. To prevent the testparticles mass to become zero)
