What is the escape speed (in km/s) from an earth-like planet with mass 6.5e+24 kg and radius 55.0 × 105 m? use the gravitational constant g = 6.67 × 10-11 m3 kg-1 s-2.

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.