Question 1 (50%) That smartphone you carry around in your pocket all day is a pretty versatile lab assistant. It is packed with internal sensors that measure everything from acceleration to sound volume to magnetic field strength. However, most people don't realize what their phones can actually do. Many apps has been developed to display and record raw data from the phone's movement, any background noises, and even the number of satellites in the neighbourhood. Watching this data stream across our phone screen, we are reminded just how powerful a computer my phone really is. Wrapped into one, the smartphone is an accelerometer, a compass, a microphone, a magnetometer, a photon detector, and a gyroscope. More advanced phones can even measure things like temperature and air pressure. To explore the power of your phone, here's a simple physics experiment you can do at your lab. Simply by making your phone as pendulum and collecting a bit of data, you can measure the length of the USB cable without ever pulling out a ruler