You throw a rock horizontally off a cliff with a speed of 20 m/s. after two seconds, the magnitude of the velocity of the rock i
1 answer:
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The displacement is 2 m south
Explanation:
Distance and displacement are two different quantities:
- Distance is the total length of the path covered by an object during its motion, regardless of the direction. It is a scalar quantity
- Displacement is a vector connecting the initial position to the final position of motion of an object. The magnitude of the displacement is the distance in a straight line between the two points
For the car in this problem, the motion is:
10 m south
8 m north
Taking north as positive direction, we can describe the two parts of the motion as
m
Therefore, the final position of the car with respect to the original position is
which means 2 m south: so, the displacement of the car is 2 m south.
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Answer: Only 25% of the intensity of a polarized light wave passes through a polarizing filter. Then the angle between the electric field and the axis of the filter will be 60 degrees.
Explanation: To find the answer of the problem given, we have to know about the Malu's law of polarization.
<h3>What is Malu's law of polarization?</h3>- This law states that, when a beam of completely polarized light is passed through an analyzer, then then intensity I of the transmitted light varies directly as the square of the angle
between the transmission direction of the polarizer and the analyzer.
- The expression for this law will be,
- Where, I₀ is the maximum intensity of the transmitted light through the polarizer.
- From the question, it is clear that, the 25% of the intensity of a polarized light wave passes through the filter.
- Thus, the angle between electric field and the axis of the filter is,
Thus, we can conclude that, the angle between the electric field and the axis of the filter will be 60 degrees.
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