shanster

A skier of mass 70.5 kg is pulled up a slope by a motor-driven cable. How much work is required to pull the skier 60 m up a 38° slope (assumed to be frictionless) at a constant speed of 2.0 m/s?

If one micrometeorite (a sphere with a diameter of 1.0 multiplied by 10-6) struck each square meter of the moon each second, it would take many years to cover the moon with micrometeorites to a depth of 1.5 m. Consider a cubic box, 1.5 m on a side, on the...