A high-speed train accelerates at a constant rate in a straight line. The speed of the train increases from 30 m/s to 42 m/s in 60 seconds.
a) Calculate the change in speed of the train

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

Aplayground merry-go-round has a radius of 4.6 m and a moment of inertia of 200 kg-m2 and turns with negligible friction about a vertical axle through its center. a child applies a 26.0 n force tangentially to the edge of the merry-go-round for 15.0 seconds. if the merry-go-round is initially at rest, how much work did the child do on the merry-go-round?

Which component of the earth’s atmosphere is decreased due to photosynthesis?