What is the volume? density is 1g/mL or 1.0g/cm3 and mass 6g

Which type of wave can travel without a medium

Afisherman notices that his boat is moving up and down periodically, owing to waves on the surface of the water. it takes a time of 2.70 s for the boat to travel from its highest point to its lowest, a total distance of 0.700 m. the fisherman sees that the wave crests are spaced a horizontal distance of 6.50 m apart. a. how fast are the waves traveling? b. what is the amplitude a of each wave?

Look at the electroscope, describe how you can cause the two leaves at the bottom to repel each other and stay that way