Which point on the pendulum's swing represents the minimum potential energy?
2 answers:
Answer: A point B the potential energy is minimum.
Explanation :
A pendulum possesses two types of energy i.e. kinetic energy and potential energy.
At the highest point of the swing, the kinetic energy is equal to zero as it is not moving. At that point, it has only gravitational potential energy and it is given by :
h is the height
The gravitational potential energy decreases as it swings in a downwards direction.
So, B is the point where the potential energy is minimum and kinetic energy is maximum.
Hence the correct option is (B) " point B ".
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Answer:
The dominant wavelength of the sun is
Explanation:
Wien's law is defined as:
(1)
Where is the maximum wavelength, c is the Wien's constant and T is the temperature.
Therefore, can be isolated from equation 1.
(2)
Notice that it is necessary to express the Wien's constant in units of meters
⇒
Finally, equation 2 can be used:
Hence, the dominant wavelength of the sun is
Answer:
D. The moon is closer to Earth than the sun.
Explanation:
Tides are formed as a consequence of the differentiation of gravity due to the moon across to the Earth sphere.
Since gravity variate with the distance:
(1)
Where m1 and m2 are the masses of the two objects that are interacting and r is the distance
For example, see the image below, point A is closer to the moon than point b and at the same time the center of mass of the Earth will feel more attracted to the moon than point B. Therefore, that creates a tidal bulge in point A and point B.
The Sun tidal force contributes to the tidal force of the moon over the earth making high tides higher and low tides lower.
However, even when the sun is more massive than the moon, it is farther away from the Earth than the moon. So, it is clear by equation 1 that the moon's gravity has a greater effect on Earth's oceans than the sun's gravity.
