Which type of sensor uses a burn-off circuit

According to the tide table below what time of day will the highest tide occur?

What is the magnitude of the resultant vector round your answer to the nearest tenth

Two trains leave a station at the same time, train a travels at a constant speed of 16 m/s. train b starts at 8.0 m/s but accelerates constantly at 1.0 m/s squared. after 10.0 seconds, which train has the greater speed?