Which of the following represents a concave lens? A. -di B. +di C. -f D. +f
2 answers:
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Answer:
The induced voltage in the Secondary is 18 volt.
Explanation:
Given that,
Voltage = 120 volt
Number of turns in primary = 500
Number of turns in secondary = 75
We need to calculate the induced voltage in the Secondary
Using relation number of turns and voltage in primary and secondary
Where, = Number of primary coil
= Number of secondary coil
= Voltage of primary coil
= Voltage of primary coil
Put the value into the formula
Hence, The induced voltage in the Secondary is 18 volt.
The two forces are equal in magnitude
Explanation:
We can answer this question by applying Newton's second law of motion, which states that
where
is the net force acting on an object
m is the mass of the object
a is its acceleration
In this problem, the airplane is moving with constant velocity, so its acceleration is zero:
a = 0
This means that the equation becomes
There are two forces acting on the airplane in the horizontal direction:
- The forward force exerted by the engine, F
- The frictional drag force, D, backward
So the net force on the plane along the horizontal direction is
However we also said that
Combining the two equations, we find
So, the two forces have same magnitude.
Learn more about Newton's second law:
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