The scale bar represents 200 meters. What is the diameter of West Crater in meters?

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

Two students, each riding bicycles, start from the same apartment building and ride to the same building on campus, but each takes a different route. the first student rides 1100 m due east and then turns due north and travels another 1430 m before arriving at the destination. the second student heads due north for 1930 m and then turns and heads directly toward the destination.at the turning point, how far is the second student from the destination?

The energy released by a nuclear fusion reaction is produced when