Answer:
Efficiency of a machine is how well the machine works and what the machine is capable of doing.
Mechanical advantage=Load/Effort.
720/180=4
When a river flows into an ocean, it slows down and deposits materials in its delta
Vf = Vi + at
Vf = 0 + 5.4•28
= 151.2m/s..
not sure if its right
Given :
Mass of water, m = 2 grams.
The temperature of water drops from 31 °C to 29 °C .
The specific heat of water is 4.184 J/(g • °C).
To Find :
Amount of heat lost in this process.
Solution :
We know, heat lost is given by :

Therefore, amount of heat lost in this process is 16.736 J.
Answer: force = mass x accelegation
Explanation: 15x3 = 45 N