The hydrogen stored inside a large weather balloon has a mass of 13.558 g. what is the volume of this balloon if the density of hydrogen is 0.089 g/l?

What is the increase in density of a medium due to wave travel?

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?

The potential energy for a mass on a spring is proportional to the square of which of these quantities? a. mass b. frequency c. period d. displacement e. velocity