Question

In a lifting machine a load of 25 kN is lifted by an effort of 250 N. If the efficiency of the machine is 80%, calculate its V.R. If the same machine lifts10 kN loads by an effort of 125 N, find the law of machine.

Answer 1

The law of the machine is 80 which states that the machine can pick up load 80 times its effort.

To calculate the velocity ratio (V.R.) of the lifting machine, we'll use the formula:

V.R. = Load ÷ Effort

Given that the load is 25 kN (kilonewtons) and the effort is 250 N (newtons), we need to convert the load to newtons:

Load = 25 kN = 25,000 N

Now, we can calculate the V.R.:

V.R. = Load / Effort = $25,000 N \div 250 N = 100$

Therefore, the V.R. of the machine is 100.

To find the law of the machine, we need to determine the relationship between the load and the effort for a given V.R.

Given that the load is 10 kN and the effort is 125 N, we'll again convert the load to newtons:

Load = 10 kN = 10,000 N

Now, we can calculate the law of the machine by dividing the load by the effort:

Law of the machine = Load / Effort = $10,000 N\div 125 N = 80$

Therefore, the law of the machine is 80, indicating that the load is 80 times the effort.

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