Galileo\'s telescope showed him that Venus has a large angular diameter of 61 se
ID: 106781 • Letter: G
Question
Galileo's telescope showed him that Venus has a large angular diameter of 61 seconds of arc when it is a crescent; a small angular diameter of 10 seconds of arc when it is nearly full and, finally, when Venus is "half full," an angular size of 59 seconds of arc. At which point described below is Venus closest to the Earth?
Compared to the surface, Earth's gravity is ______ times weaker at 26 Earth radii.
None of these are correct.
Compare the force of gravity on the surface of Uranus with the force of gravity at Earth's surface. Mass of Uranus is 14.5 that of the Earth and its radius is 4.01 that of the Earth.
= ____
Why did Newton conclude that some force had to pull the moon toward Earth?
a small angular diameter of 10 seconds of arc when it is nearly full "half full," with its angular size of about 59 seconds of arc a large angular diameter of 61 seconds of arc when it is a crescent OExplanation / Answer
Galileo's telescope showed him that Venus has a large angular diameter of 61 seconds of arc when it is a crescent; a small angular diameter of 10 seconds of arc when it is nearly full and, finally, when Venus is "half full," an angular size of 59 seconds of arc. At which point described below is Venus closest to the Earth?
a small angular diameter of 10 seconds of arc when it is nearly full
Compared to the surface, Earth's gravity is ______ times weaker at 26 Earth radii.
676
26 Earth radii away from the center of the Earth, the gravitational force will be 676 times weaker.
None of these are correct.
Compare the force of gravity on the surface of Uranus with the force of gravity at Earth's surface. Mass of Uranus is 14.5 that of the Earth and its radius is 4.01 that of the Earth.
= ____
The surface gravity on Uranus is about 89% of the surface gravity on Earth that is
(uranus)GM/r = (Earth)GM/r
(14.5*8.69)/4.01=9.8
31.8=9.8
3.6 times that of Earth
Why did Newton conclude that some force had to pull the moon toward Earth?
Because it is not traveling in a straight line and it is not going away from us. Therefore something is keeping the moon close to earth and not just close, it is keeping it in orbit. You have to realize that before he did work on his law of universal gravitation, he already accepted the fact that every massive body travels in a straight line and force must be used to alter its path from the straight line. So if moon is NOT traveling in a straight line and the moon is massive, there is a force acting on it. Therefore The force and acceleration in Newton's second law must have the same direction.
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