A granular material is observed being dumped from a conveyor belt. It firms a conical pile with about the same slope angle, 1.8 horizontal to 1 vertical. What is the angle of internal friction of this material?The bulb in the device is filled with a medium rounded sand in the densest state possible. Every effort is made to keep the sand saturated. A transparent tube allows observation of the water level in the battery filler. What will happen to the water level, if anything, as the bulb is squeezed very hard? Why? Would it matter if the sand were loose? Explain: