Given the current issues we are facing and how reports suggest that Covid-19 can remain viable and infection of some surfaces for days after contamination can I suggest that people remember to sanitise their hands before and after finding the container and signing the log book. The main priority here is that we should always stay safe.
There is nothing at the published co-ordinates just a small space. There is nothing there to help you. The cache is somewhere within 350 metres of this spot.
The speed of sound is the distance traveled per unit time by a sound wave propagating through an elastic medium. In dry air at 20 °C, the speed of sound is 343.2 metres per second. This is 1,236 kilometres per hour or a kilometre in 2.914 seconds.
The speed of sound in mathematical notation is conventionally represented by c, from the Latin celeritas meaning "velocity".
In general, the speed of sound c is given by the Newton–Laplace equation:
where
- Ks is a coefficient of stiffness, the isentropic bulk modulus (or the modulus of bulk elasticity for gases);
- ρ is the density.
Thus the speed of sound increases with the stiffness (the resistance of an elastic body to deformation by an applied force) of the material, and decreases with the density. For ideal gases the bulk modulus K is simply the gas pressure multiplied by the dimensionless adiabatic index, which is about 1.4 for air under normal conditions of pressure and temperature.
Given that it was 9 °C with a relative humidity of 87% on the day of placement, who would hear someone popping a paper bag in the middle of the above co-ordinates ?
You can validate your puzzle solution with certitude.
The cache is tiny - nothing more than a log book so bring tweezers and a writing impliment.
Congratulations to Emma_E on being the first to find!