which two statements explain why a student standing at the top of a step stool doesnt move downwards

Aballet student who learns with the of his instructor is demonstrating learning.

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.

Under normal conditions, describe how increasing the temperatures effects the solubility of a typical salt