Answer:
Angular acceleration, 
Explanation:
Given that,
Initial angular velocity, 
The final angular velocity, 
Time, t = 4.2 s
We need to find her average angular acceleration during this time interval. Acceleration is the rate of change of velocity. So,
So, her average angular acceleration is 
.
Intensity of wave is defined as the work per unit area and it is calculated through the equation,
I = P / A
If a person moved farther from the light source, the area covered by the light. With the equation, A is a inversely proportional to light. If the distance is to cover half of the team. The answer therefore, the intensity of the wave is lessened.
<em>The convex lens is a lens that converges rays of light that convey parallel to its principal axis (i.e. converges the incident rays towards the principal axis) which is relatively thick across the middle and thin at the lower and upper edges. The edges are curved outward rather than inward.</em>
