Aforce of 40.0 n accelerates a 5.0-kg block at 6.0 m/s2 along a horizontal surface.
a) what would be the block's acceleration be if the surface were frictionless?

b) how large is the kinetic friction force?

c) what is the coefficient of kinetic friction?

Galileo was the first to notice that the moon has craters, valleys, and mountains. how might this have changed people's perception of the moon at the time?

Africtionless piston-cylinder contains 50 l of saturated liquid r-134a. the piston has a mass and an area resulting in an applied pressure of 500 kpa on the refrigerant. the refrigerant is now heated until its temperature rises to 70∘c. calculate the work (in kj) done during this process.

Física: un futbolista patea hacia el arco con una velocidad de 15m/ah, calcular: a)el alcance para un ángulo de tiro de 25º, b) el tiempo que el balón permanece en el aire.