D. Nucleus because it is not a part of the group.
Explanation:
We have,
Length of a metal rod is 55 cm or 0.55 m
Change in length is 0.2 cm or 0.002 m
It is required to find the change in temperature of a metal rod. The coefficient of linear expansion is given by :
is the change in temperature
So, the change in temperature is 303.03 degrees Celsius.
Answer:
Explanation:
The two media must have differing index of refraction.
Index of refraction is an indication of how fast light can move through the media.
If a light wave approaches an interface at an angle and the media the light is moving into has a higher index of refraction meaning slower light speed in the media, then the part of the wave front hitting first gets slowed down sooner. As each section of the wave front crosses the interface, the whole wave front has changed direction toward the side with the first drag. Much like a column of marching soldiers executing a slight turn each at the precise moment to keep both columns and lined up in "military precision"
If the media the light is moving into has a smaller index of refraction, meaning higher light speed, then the side of the light beam hitting the interface first speeds up before the opposite side of the beam. This makes the angle leaving the interface much closer to the interface surface than the angle inside the higher index media. There becomes a point called the critical angle where the light cannot exit the higher index of refraction and the condition of total internal reflection exists. Think fiber optic cable which can transmit signals hundreds of miles without significant loss.
Answer:
Explanation:
The force needed to pull up the backpack up increases as the backpack gets higher because the force of gravity needs to be encountered by the tension of the string. According to the formula to calculate the tension, assuming both are equal 
, the force of tension increases as the angle(with respect to horizontal axis) decreases. It is not possible to pull the rope hard enough because there will be no force in the y direction to counter the Fg; therefore, infinite force is needed.
