Answer:
The force is 
Explanation:
From the question we are told that
The mechanical advantage is 
The load is 
The height is 
Generally mechanical advantage is mathematically represented as
Here E is the force that must be applied to move the piano
=> 
=> 
=>
Answer:
D
Explanation:
chemical energy is the energy stored in the bonds between atoms and molecules.
Answer:
energy from excess mass
Explanation:
The correct answer for the given question out of the given options is the option " energy from excess mass ".
This happens due to the fact that some of the matter is converted into the energy during the fusion of atoms.
The relation that can be stated is E = mc²
where,
E is the energy
c is the speed of the light
m is the mass of the matter
