A student on roller skates glides across a floor with a lunch tray. Total mass is 1.3 kg at waist level 1.1m above the floor from the cash register to her table 23.4 m away how much work is done

True or false: the cycle of seasons on the earth is caused by the tilt of the earth on its axis toward and away from the sun.

Which accurately compares concave and convex lenses?

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?