Why nuclear fusion difficult to be carried out in a laboratort​

Acompound machine is also called a machine. a. force b. simple c. complex d. directional

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?

Plz explain what friction, corollas, and a low pressure gradient does to an air parcel. what is 1+1=