How does conduction work in metals?

How does a vacuum flask keep a beverage warm for long periods? (6 Marks)

Two cars are crash tested. Car A has a crumple zone, B doesn't. Both cars have mass 1500kg and a driver of mass 80kg and crash at 20m/s. Cars A and B take 0.8 and 0.2 seconds to stop respectively. Using this information, are crumple zones a necessity? (6)

what is a half life of a substance and how can you work it out.

What are the different ways that energy can be transferred?