Construct Your Own the generation of electricity by a radioactive isotope in a space probe, such as described in Exercise Construct a problem in which you calculate the mass of a radioactive isotope you need in order to supply power for a long space flight. Among the things to consider are the isotope chosen, its half-life and decay energy, the power needs of the probe and the length of the flight.
Alyssa Montgomery Design Internal Assessment Running Shoes: Friends or Foes Research Question: What effect does the thickness of the shoe’s sole have on the amount of force being transferred to the runner’s knee Hypothesis: If the thickness of the shoe’s sole is increased, then the force applied to the runner’s knee will be less. The theory behind this experiment is that since force is equal to the change in momentum over the change in time, by keeping the momentum of the foot the same but increasing the time that it takes for that force to be applied, then the force will decrease because by dividing by a larger period of time over a constant momentum will cause the quotient to be smaller. Variables: Manipulated Variable: The width of the shoe sole will be changed throughout the experiments. Starting from a width of 0 cm (no sole) increasing in increments of .5 cm, the sole of the shoe will keep increasing until a width of 5 cm is reached. When measuring the thickness of the rubber inserts, one can use a set of calipers. The uncertainty will be around +/ 0.05 cm, but it can change depending on the set of calipers that are used. Responding Variable: The measured amount of force is the responding variable, and with each change of thickness, the force will be measure by a force sensor at the position where a human knee would be found. The uncertainty of the force sensor will vary with which force sensor is used. Controlled Variables: The variables that
