Kepler's____ of planetary motion states that the planets have an elliptical orbit, with the Sun at one focal point of the ellips
2 answers:
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Answer:
Frequency,
Explanation:
We have,
Speed of radio waves is
Wavelength of radio waves is
It is required to find the frequency of the radio waves. The speed of a wave is given by :
So, the frequency of the radio wave is .
Answer: N = Mgcos(theta)
Therefore, the Normal reaction force is equal to Mgcos(theta)
Explanation:
See attached for a sketch.
From the attachment.
.
N = normal reaction force on block
W = weight of the block
theta = angle of the inclined plane to the horizontal
From the sketch, we can see that
N is equal in magnitude but opposite direction to Wy
N = Wy
And
Wy = Wcos(theta)
Wx = Wsin(theta)
Then,
N = Wy = Wcos(theta)
But W = mass × acceleration due to gravity = mg
N = Mgcos(theta)
Therefore, the Normal reaction force is equal to Mgcos(theta)
