Answer:
(C) 16 radians
Explanation:
The angular displacement is given by the following equation:
Here
Is the angular displacement of the body at the indicated time (t).
Is the angular velocity of the body at the initial moment.
Is the angular acceleration of the body.
The disk starts from rest, so 
Replacing the given values:
<u>Answer:</u>
Submarines use a device called Periscope that uses the concept of multiple reflections and help us see objects above the water surface.
<u>Explanation:</u>
When a light ray falls on a reflecting surface like a mirror, it gets reflected. In multiple reflections, the incident light ray is made to reflect multiple times by arranging the reflecting surfaces in different ways.
In submarines, we use Periscope, which is a long tube like structure. The long tube is bent at ends. It uses two simple mirrors which are placed parallel to each other at an angle of 45 degrees. The light from one mirror gets reflected to the other mirror, thus causing a multiple reflection.
They help keep the country in check because without them there would be chaos
0.39 cm is the compression in the spring by atmospheric pressure. Work done by the atmospheric pressure is 0.031J in compressing the spring.
a) When the air beneath the piston is completely pumped out, then formula for the atmospheric pressure causing the spring to compress will be: p°A = kx
where, x= compression, A= area, p°= atmospheric pressure and k= spring constant
Now, p°A = kx
x = p°A/x
x = p° (πr²)/k
Putting the values: x= {(1.0 × 10⁵) × π × (0.023)²}/4200
x= 0.0039 meter
Thus, x= 0.39 cm is the compression in the spring.
b) work done by the atmospheric pressure to compress the spring will be: W=(1/2)kx²
where, w= work done, k= spring constant and x= compression
Now, W=(1/2)kx²
W= (1/2) × 4200 × (0.0039)²
W= 0.031 Joule
Thus, work done by the atmospheric pressure is 0.031J.
To learn more about work done visit the link- brainly.com/question/28366277
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10cm per beat, it would take 3 beats to travel 30cm x
