3.5. Estimating Power Requirements with a Problem Example

Try these first

1. 1.

   Convert 25,000 kg into tons.

   Hint

   Remember, divide by 1000.

2. 2.

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

   Hint

   Multiply weight in tons by the rolling resistance.

3. 3.

   What is the rolling resistance for a vehicle weighing 100 tons and rolling resistance of 25 kg per ton?

   • 2500 kg
   • 2000 kg
   • 3000 kg

   Hint

   Multiply the weight in tons by the rate.

4. 4.

   True or False: The only factor impacting usable power is the weight of the vehicle.

   • True
   • False

   Hint

   Consider other aspects like grade and rolling resistance.

5. 5.

   A construction vehicle weighing 20 tons operates on a road with a rolling resistance of 50 kg per ton and a 4% slope. Calculate the total tractive effort needed and the usable power if its max rimpull is 8000 kg.

   Hint

   Find total resistance first, then subtract from max rimpull.

6. 6.

   If a machine has a rolling resistance of 15 kg per ton and weighs 10 tons on a 3% incline, how much additional power is needed to tow 2000 kg uphill?

   Hint

   Calculate both resistances to find your total effective pull.