Which structure is the statement below most likey referring to?

What are three factors that determine the amount of electrical energy? How does the falling mango change it's energy conversion? Is the relationship between altitude and air pressure direct inverse or is there no relationship? How does changing wave frequency affect light and sound? How does a object become negatively charged? What does the amount of heat needed to raise an objects temperature depend on? What happens to the speed particles? Why do you seem to weigh more in in than water? Why two wires carrying current do not attract each other yet there are magnetic field around both the wires? How a cell is essential in a circuit to provide energy for lights and motors? What does it mean to decelerate? What makes it difficult to push a book along the floor? What is Nonvisible radiation? How was the thermometer invented? Why did max tallmi influence albert einstein? Did Einstein develop the atomic bomb? When a body move in a circle it has angular velocity then the direction of angular acceleratun will be? The three laws dealing with the creation of various spectra are due to? How much is 1000 L of water in gallons? What is the wavelength of a wave that has a speed of 30 ms and a frequency of 6.0 Hz?

Which structure is the statement below most likey referring to?