An iron rod is 2.58m long at 0 degree celcius. Calculate the length of a brass rod at 0 degree celcius if the difference between the lengths of the two rods must remain the same at all temperatures. (Linear expansivity of iron=1.2 × 10‐⁵K‐¹ , Linear expansivity of brass = 1.9 × 10‐⁵ K‐¹).

In a system with only a single force acting upon a body, what is the relationship between the change in kinetic energy and the work done by the force? answers: work is equal to the change in kinetic energy.work depends on the square of the change in potential energy.work is equal to the negative of the change in kinetic energy.work is equal to the square of the change in kinetic energy