According to einstein's first postulate about the special theory of relativity, which best explains why a person feels like he or she is sitting still on a train that is moving at a constant speed of 60 miles per hour? the train is moving more slowly than the speed of light. the person is moving at the same speed as the train. the motion of the train and of the person are not relative to each other. the reference frame of the person is inside the

Part 1: a magnetic levitation or maglev train rides rails without touching them. explain how this works using your data. include the appropriate magnet drawing in your answer. part 2: two objects are near a bar magnet. one is about 1 cm away, while the other is 6 cm away. compare and contrast the magnetic force that affects each object. use your data to answer the question

Afisherman notices that his boat is moving up and down periodically without any horizontal motion, owing to waves on the surface of the water. it takes a time of 2.20 s for the boat to travel from its highest point to its lowest, a total distance of 0.670 m . the fisherman sees that the wave crests are spaced a horizontal distance of 5.80 m apart. (a) how much is the wavelength? (b) find the period of the wave. (c) how fast are the waves traveling? (d) what is the amplitude a of each wave?

Explain what happens at the saturation point when adding salt to water at room temperature.