Explanation:
Given data:
Area A = 10 cm×2 cm = 20×10⁻⁴ m²
Distance d between the plates = 1 mm = 1×10⁻³m
Voltage of the battery is emf = 100 V
Resistance = 1025 ohm
Solution:
In RC circuit, the voltage between the plates is related to time t. Initially the voltage is equal to that of battery V₀ = emf = 100V. But After time t the resistance and capacitor changes it and the final voltage is V that is given by
Taking natural log on both sides,
(1)
Now we can calculate the capacitance by using the area of the plates.
C = ε₀A/d
= 
= 18×10⁻¹²F
Now we can get the time when the voltage drop from 100 to 55 V by putting the values of C, V₀, V and R in the equation (1)
= -(1025Ω)(18×10⁻¹² F) ln( 1 - 55/100)
= 15×10⁻⁹s
= 15 ns
Reduce the friction between the moving parts.
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Answer:
0.5
Explanation:
because the block is attached to the pulley of the string
Scientists believe that galaxies are created from one of two theories. First is the Top-down theory, this theory states that when gases collapses in space, it forms large clumps wich are each the size of multiple galaxies. These gas clumps would then break down and form individual galaxies. Scientists believe that this theory is the reason why we find galaxies in clusters.
The other theory is known as the Bottem-up theory. This theory is the opposite of the first theory, where scientists believe that gases in space collapse and compress into clumps the size of millions of suns, which is small for the size of galaxies. The clumps then would merged together to form a galaxy
