Amachine uses 1000 j of electric energy to raise a heavy mass, increasing its potential energy by 300 j. what is the efficiency of this process?

Efficiency of this process is 30 %.

Explanation:

It is given that,

Electric energy used by the machine,

The potential energy of the machine is increased,  

The efficiency of this machine is given by :

So, the efficiency of this process is 30 %. Hence, this is the required solution.                

c.the charges if the proton and electron and gravity

firearm identification is the process of analyzing the bullets and cartridge cases left at a crime scene to determine if they came from a particular firearm. marks on the bullets and cartridges may be common to every firearm of that type. these are called class characteristics.