Answer:
Explanation:
As per Kepler's III law we know that time period of revolution of satellite or planet is given by the formula
now for the time period of moon around the earth we can say
here we know that
= mass of earth
Now if the same formula is used for revolution of Earth around the sun
here we know that
= mass of Sun
now we have
(a) The plastic rod has a length of L=1.3m. If we divide by 8, we get the length of each piece:
(b) The center of the rod is located at x=0. This means we have 4 pieces of the rod on the negative side of x-axis, and 4 pieces on the positive side. So, starting from x=0 and going towards positive direction, we have: piece 5, piece 6, piece 7 and piece 8. Each piece is 0.1625 m long. Therefore, the center of piece 5 is at 0.1625m/2=0.0812 m. And the center of piece 6 will be shifted by 0.1625m with respect to this:
(c) The total charge is
. To get the charge on each piece, we should divide this value by 8, the number of pieces:
(d) We have to calculate the electric field at x=0.7 generated by piece 6. The charge on piece 6 is the value calculated at point (c):
If we approximate piece 6 as a single charge, the electric field is given by
where
and d is the distance between the charge (center of piece 6, located at 0.2437m) and point a (located at x=0.7m). Therefore we have
poiting towards the center of piece 6, since the charge is negative.
(e) missing details on this question.
This isn't physics, it's biology but basically, when you breath in oxygen, the oxygen goes to the lungs which transfer it to the blood cells. The heart then pumps the blood cells round to the organs, muscles etc and the blood cells drop off the oxygen where necessary, they then pick up carbon dioxide and the heart pumps them to the lungs where the blood cells give the lungs the carbon dioxide and the lungs make you breath the carbon dioxide out (his is a very simplified explanation, I'm not a biologist)
Answer:
1) For motion in two dimensions Cartesian co-ordinate system is generally preferred though polar co-ordinate system can be also used for problems involving circular motion.
2) For a general plane motion we can choose any frame depending on the problem that makes it easier to analyse but in general Cartesian coordinate system is preferred.
Explanation:
Motion of particles in space or in planes can be arbitrary in nature meaning that the particle can choose any path to travel. So for the cases of planar motion the Cartesian co-ordinate system is preferred as we are to deal with only 2 unknown position co-ordinates of the particle. But if the motion is circular such as around a circle then the analysis is much simplified by using polar co-ordinate system.
Similarly depending on the motion of the particle in space we can choose Cartesian or spherical or cylindrical co-ordinate system for easier analysis depending upon the nature of the problem.
