Why is gravitational force always towards the center?
2 answers:
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Answer:
b)
Explanation:
Rotational inertia of the sphere:
Rotational inertia of hollow sphere:
Rotational inertia of flat disk:
The largest value is 2/3 mr², therefore, hollow sphere's inertia is largest.
Transformer contains two coils: primary and secondary. They allow change of voltage to lower or higher value. In first case we have step-down and in second case we have step-up transformer.
Formula used for transformer is:
Where:
N1 = number of turns on primary coil
N2 = number of turns on secondary coil
V1 = voltage on primary coil
V2 = voltage on secondary coil
In a step-down transformer primary coil has more turns than secondary coil. So the ratio 1:29 means that for each turn on secondary coil we have 29 turns on primary coil.
We can solve the equation for V2:
Secondary coil provides voltage of 4.14V.
Formula used for transformer is:
Where:
N1 = number of turns on primary coil
N2 = number of turns on secondary coil
V1 = voltage on primary coil
V2 = voltage on secondary coil
In a step-down transformer primary coil has more turns than secondary coil. So the ratio 1:29 means that for each turn on secondary coil we have 29 turns on primary coil.
We can solve the equation for V2:
Secondary coil provides voltage of 4.14V.