Copper wiring has been the standard used for communications systems since before the invention of the telephone in 1876. true or false?

The answer is; true

The reason for use of copper is due to the metal’s high conductivity due to its high valence in its atom’s outermost shell of +3.   It is perfect for transmitting voice signals and telegrams in telegraphs. Another property of copper that appeals to its use in communication wiring is its corrosion resistance and ductility.  

(newtons first law)

conservation of momentum law states :

momentum before collision = momentum after collision

momentum p (kg-m/s)= mass * velocity

say moving car=1 000 kg, velocity = 10 m/s then p = 1 000*10= 10 000 kg-m/s

say still car = 2 000 kg, velocity = 0 m/s then p = 2 000* 0 = 0 kg-m/s

total momentum prior to collision = 10 000 + 0 = 10 000 kg-m/s

momentum after collision = 10 000 kg-m/s

mass now = 1 000 kg+2 000 kg = 3 000 kg

10 000 = 3 000 kg* velocity m/s

10 000/3 000 = velocity

3.33 m/s = velocity after collision

an impulse is a force applied over time , momentum is exclusive of external forces and a perfect collision is implied

here are some of the ways in which chemical and nuclear reactions differ.

explanation: