Explanation:
V=C/n
Quartz: (3×10^8)/(1.54)=1.948×10^8 m/s
The higher the index of refraction the slower light will travel, so light will be slower in ruby.
Answer:
Given:
Radius of curvature (R) of a spherical mirror = 20
To Find:
Focal length (f)
Explanation:
Formula:
Substituting value of R in the equation:
Below is the solution:
Let us say that the disk goes through a vertical elevation change of one meter.
<span>The change in potential energy will equal the change in kinetic energy </span>
<span>PE = KEt + KEr </span>
<span>mgh = ½mv² + ½Iω² </span>
<span>for a uniform disk, the moment of inertia is </span>
<span>I = ½mr² </span>
<span>and </span>
<span>ω = v/r </span>
<span>mgh = ½mv² + ½(½mr²)(v/r)² </span>
<span>mgh = ½mv² + ¼mv² </span>
<span>gh = ¾v² </span>
<span>v² = 4gh/3 </span>
<span>v² = u² + 2as </span>
<span>if we assume initial velocity is zero </span>
<span>v² = 2as </span>
<span>a = v² / 2s </span>
<span>s(sinθ) = h </span>
<span>s = h/sinθ </span>
<span>a = 4gh/3 / 2(h/sinθ) </span>
<span>a = ⅔gsinθ </span>
<span>a = ⅔(9.8)sin25 </span>
<span>a = 2.8 m/s² </span>
The answers to this question is the 4th one
Answer:
A
Explanation:
earthquakes release energy