Answer: -1.68 μC/m^2
Explanation: In order to solve this problem we have to consider the equilibrium between the gravititional and electric forces on the small amber bead.
In this sense we have:
Fg-Fe=0 where Fe= q* E field from the plane (σ/ε0)
m*g-q*σ/ε0
replacing the values
σ=m*g*ε0/q =(12.6*10^-3*9,8*8.85*10^-6)/0.646= -1.68 μC/m^2
Explanation:
The principle of uniformitarianism was proposed by James Hutton, a Scottish geologist to explain geologic processes and how they relate in space.
According to the principle "the present is the key to the past and geologic process occurring today have occurred in times past. ".
- Saddled with this knowledge, geologists can understand and unravel how rocks form and how the earth has been sculpted.
- Today, in some places on earth, we see volcanic activities.
- Such a place is on the Hawaiian Islands where hot plumes are coming to the surface.
- In like manner, the lava cools and solidifies to form new volcanic basalt.
- Using this knowledge, any geologist can unravel any igneous rock.
- From the activities in Hawaii, we know that past igneous rocks must have been formed by the cooling and solidification of magma.
- This the tenet of the uniformitarian principle.
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Answer:
True
Explanation:
This is true statement because in DC circuit there is only resistance which comes into play of opposition of current.
In DC circuit there is no role of frequency in if there is no frequency then there will no inductive reactance and no capacitive reactance to oppose the current flow
So in DC circuit only resistance is responsible to oppose the flow of current
So this is a true statement
Answer:
ω' = 0.815 rad/s
Explanation:
Given,
R = 1.20 m
Inertia of merry-go- round= 240 kg.m²
Rotating speed = 9 rpm =
=0.9424 rad/s
mass of the child, m = 26 kg
angular speed of the merry-go-round=?
we know
Angular momentum, L = I ω
Moment of inertia of the child
I' = m r² = 26 x 1.2² = 37.44 kgm²
Conservation of angular momentum
initial angular momentum = Final angular momentum
I ω = (I+I')ω'
240 x 0.9424 = (240+37.44) ω'
226.176= 277.44 ω'
ω' = 0.815 rad/s
new angular speed of the merry-go- round is equal to 0.815 rad/s