Can I please get some help with this

In positive numbers less than 1, the zeros between the decimal point and a non-zero number are blank significant

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.

In an experiment, how can i change human errors? be specific.