A 35kg boy is riding an 18kg bike down a path the bike is moving at 11 m/s

In a good thermo flask the main cause of heat loss is

What is an example of static friction

Consider the phase change taking place in the picture. you could use all but one statement to describe what is happening here. that is: a) temperature is increasing. b) kinetic energy is increasing. c) the space between the particles remains the same. d) the attractive force between the particles is decreasing.