75000 meters / 3600 seconds = 20.8 meters/second
2. power = force * speed = 20.8 * 800 Joules/second or Watts
1. work = power *time = that power * 30*60 seconds
easier to do 2 before 1 because do not have to calculate distance
A truck pulls a trailer at 75km/h and exerts a uniform pulling force of 800N on the trailer .calculate
1. The work done by the trailer in 30min.
2.the power required to pull the trailer.
2 answers
A block stone having a mass of 75kg is hauled along a horizontal floor for a distance of 100m in 2min. The coefficient of friction is 0.3. Calculate horizontal force required