The GPS satellites that track your phones move at a speed of 3460 m/s, relative to the ground. If one full year passes on the ground, how much less time is measured by one of the satellites?

Idon’t quite understand this problem

Aturntable a is built into a stage for use in a theatrical production. it is observed during a rehearsal that a trunk b starts to slide on the turntable 10 s after the turntable begins to rotate. knowing that the trunk undergoes a constant tangential acceleration of 0.31 m/s2, determine the coefficient of static friction between the trunk and the turntable.

The ability to make things happen is also called a. heat b. force c. matter d. energy