i have these questions for homework and they been bugging me any help on working them out will be greatly appreciated 1. Speed is displayed on a bicycle computer to within 0.1 km/hr (about 0.03 m/s). However we are puzzled how this accuracy is obtained. Measurements are updated each second, and assumed to be taken over 1 second intervals; the circumference of the tyre is 4.31 m (assume that the 1 s time interval and the circumference are both precise values). Based on the fact that the rotation of the wheel is detected by a magnet on one spoke passing a detector on the front fork, what is the uncertainty, in m/s, of the displayed speed? Answer to 2 significant figures please. 2. A toy rocket using compressed air and water is fired at an angle of 60º to the horizontal, with launch speed of 34 m/s. It returns to earth some distance away, coincidentally at the same angle and speed (its propulsion reactivated on the way down - pity about the damage on impact). The time from launch to landing was 5.7 second. What is the magnitude of its mean acceleration during the flight, in m/s 2? 3. A light spring is compressed by pushing it at each end. The force applied at each end is 40 newton (which can be verified by using a force gauge). What is the tension (in newton) in the middle of the spring?