Explanation:
(a) Given that,
Area of a parallel plate capacitor, 
The separation between the plates of a capacitor, 
The dielectric constant of, k = 2.1
When a dielectric constant is inserted between parallel plate capacitor, the capacitance is given by :
Putting all the values we get :
(b) We know that the Teflon has dielectric strength of 60 MV/m, 
The voltage difference between the plates at this critical voltage is given by :
or
V = 0.6 kV
No, the medium does not move, but only vibrates in a perpendicular manner to which the wave is traveling.
Answer:
This does not violate the conservation of energy.
Explanation:
This does not violate the conservation of energy because the hot body gives energy in the form of heat to the colder body, this second absorbs energy. This will be the case until both bodies reach the same temperature, reaching thermal equilibrium and reducing the transfer of thermal energy. In this way the energy was only transferred from one body to another but the total energy of the system (body 1 plus body 2) will be the same as in the beginning, respecting the principle of conservation of energy or also called the first principle of thermodynamics .
The part of physics that studies these processes is in turn called heat transfer or heat transfer or thermal transfer. Heat transfer occurs whenever there is a thermal gradient or when two systems with different temperatures come into contact. The process persists until thermal equilibrium is reached, that is, until temperatures are equalized. When there is a temperature difference between two objects or regions close enough, the heat transfer cannot be stopped, it can only be slowed down.
For example, a bonfire/campfire and a burning candle
