Calcular la frecuencia cuyo periodo es t=0,0125 s y luego exprese el resultado en khz

In the image, the arrow is pointing to a celestial object. which attribute disqualifies the object from being a planet?

For which pair of objects would adding the same a

Two masses are connected by a rope that hangs over a pulley as shown below. the pulley is a uniform cylinder of radius 푅=0.381meters and mass 푀=3.1푘푔. initially 푚"is on the ground and 푚#rests 2.5 meters above the ground. if the system is released, use conservation of energy to determine the speed of 푚#just before it strikes the ground. assume the pulley bearing is frictionless.