Answer:

Explanation:
The problem is solved using the law of conservation of energy,
So




 
        
             
        
        
        
The work done against gravity is 100 J
Explanation:
The work done against gravity in order to lift an object is equal to the change in gravitational potential energy of the object:

where
m is the mass of the object
g is the acceleration of gravity
 is the change in height of the object
 is the change in height of the object
For the object in this problem, we have:
m = 5 kg


Substituting into the equation,

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Answer:
Seafloor spreading is a geologic process in which tectonic plates—large slabs of Earth's lithosphere—split apart from each other. ... As tectonic plates slowly move away from each other, heat from the mantle's convection currents makes the crust more plastic and less dense
Explanation:
 
        
             
        
        
        
Answer:
Therefore the ratio of diameter of the copper to that of the tungsten is 

Explanation:
Resistance: Resistance is defined to the ratio of voltage to the electricity.
The resistance of a wire is
- directly proportional to its length i.e 
- inversely proportional to its cross section area i.e 
Therefore 

ρ is the resistivity.
The unit of resistance is ohm (Ω).
The resistivity of copper(ρ₁) is 1.68×10⁻⁸ ohm-m
The resistivity of tungsten(ρ₂) is 5.6×10⁻⁸ ohm-m
For copper:


 ......(1)
......(1)
Again for tungsten:

 ........(2)
........(2)
Given that  and
   and    
Dividing the equation (1) and (2)

 [since
   [since  and
   and     ]
]



Therefore the ratio of diameter of the copper to that of the tungsten is 

 
        
             
        
        
        
Answer:
The physical change of the butter in the microwave is the butter melting
Explanation: