3.1. Determining Available Power

Try these first

1. 1.

   Convert 50,000 kg to tons.

   Hint

   Recall that 1 ton equals 1000 kg.

2. 2.

   What is the rolling resistance for a machine weighing 50 tons with a rolling resistance of 30 kg per ton?

   Hint

   Multiply the weight in tons by the rolling resistance kg per ton.

3. 3.

   What is the rolling resistance for a machine weighing 50 tons with a rolling resistance of 28 kg/ton?

   • 1400 kg
   • 1800 kg
   • 3200 kg

   Hint

   Convert tons to kg for calculation.

4. 4.

   True or False: Usable power is the total power before accounting for resistance.

   • True
   • False

   Hint

   Think about how power is used in moving machinery.

5. 5.

   A 50-ton truck encounters a rolling resistance of 25 kg per ton and a 8% grade leading to additional grade resistance. Calculate the total resistance faced by the truck.

   Hint

   Break down the problem into rolling and grade resistance calculations.

6. 6.

   A tractor weighs 12 tons with a rolling resistance of 50 kg per ton. On a flat surface, it operates at an available power of 6000 kg. If it encounters a 3% slope, how much power can it still use for work?

   Hint

   First compute rolling resistance, then grade resistance, and finally subtract from available power.