What is the magnitude of the induced electric field at a distance r 2 from the center of the loop (in V/m)

During which interval are the persons represented by the graph not moving? a) 0 to 0.5 hrs b) 1.5 to 2 hrs c) 2 to 2.5 hrs d) 4.5 to 5 hrs

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

What kind of simple machine is a catapult?