English
Karnataka Board PUCPUC Science Class 11

If the sun and the planets carried huge amounts of opposite charges ______. all three of Kepler’s laws would still be valid. only the third law will be valid. the second law will not change.

Advertisements
Advertisements

Question

If the sun and the planets carried huge amounts of opposite charges ______.

  1. all three of Kepler’s laws would still be valid.
  2. only the third law will be valid.
  3. the second law will not change.
  4. the first law will still be valid.
Fill in the Blanks
Short/Brief Note
Advertisements

Solution

a, c and d

Explanation:

Coulomb’s electric force or Electrostatic force of attraction will produce opposite charges.

If the sun and the planets carry a huge amount of opposite charges, then the electrostatic force of attraction will be large. Gravitational force is also attractive in nature have both forces will be added and both are radial in nature.

Both the forces obey inverse square law and are central forces. As both forces are of the same nature, hence all three of Kepler’s laws will be valid.

shaalaa.com
  Is there an error in this question or solution?
Chapter 8: Gravitation - Exercises [Page 60]

APPEARS IN

NCERT Exemplar Physics Exemplar [English] Class 11
Chapter 8 Gravitation
Exercises | Q 8.12 | Page 60

Video TutorialsVIEW ALL [1]

RELATED QUESTIONS

A comet orbits the Sun in a highly elliptical orbit. Does the comet have a constant (a) linear speed, (b) angular speed, (c) angular momentum, (d) kinetic energy, (e) potential energy, (f) total energy throughout its orbit? Neglect any mass loss of the comet when it comes very close to the Sun.


A Saturn year is 29.5 times the earth year. How far is the Saturn from the sun if the earth is 1.50 ×108 km away from the sun?


State Kepler's laws of planetary motion.


Let the period of revolution of a planet at a distance R from a star be T. Prove that if it was at a distance of 2R from the star, its period of revolution will be \[\sqrt{8}\] T.


The square of its period of revolution around the sun is directly proportional to the ______ of the mean distance of a planet from the sun.


Write the Kepler’s laws.


The third law of Kepler is also known as the Law of ______.


If the distance between the sun and the earth is made three times, then attraction between the two will ______


The mass and radius of earth is 'Me' and 'Re' respectively and that of moon is 'Mm' and 'Rm' respectively. The distance between the centre of the earth and that of moon is 'D'. The minimum speed required for a body (mass 'm') to project from a point midway between their centres to escape to infinity is ______.


The earth moves around the sun in an elliptical orbit as shown in the figure. The ratio, `"OA"/"OB"` = x. The ratio of the speed of the earth at Band at A is ______.


In our solar system, the inter-planetary region has chunks of matter (much smaller in size compared to planets) called asteroids. They ______.


Supposing Newton’s law of gravitation for gravitation forces F1 and F2 between two masses m1 and m2 at positions r1 and r2 read F1 = – F2 = `- r_12/r_12^3 GM_0^2 ((m_1m_2)/M_0^2)^n` where M0 is a constant of dimension of mass r12 = r1 – r2 and n is a number. in such a case.

  1. the acceleration due to gravity on earth will be different for different objects.
  2. none of the three laws of Kepler will be valid.
  3. only the third law will become invalid.
  4. for n negative, an object lighter than water will sink in water.

A star like the sun has several bodies moving around it at different distances. Consider that all of them are moving in circular orbits. Let r be the distance of the body from the centre of the star and let its linear velocity be v, angular velocity ω, kinetic energy K, gravitational potential energy U, total energy E and angular momentum l. As the radius r of the orbit increases, determine which of the above quantities increase and which ones decrease.


lf the angular momentum of a planet of mass m, moving around the Sun in a circular orbit is L, about the center of the Sun, and its areal velocity is ______.


Two planets A and B of equal mass are having their period of revolutions TA and TB such that TA = 2TB. These planets are revolving in the circular orbits of radii rA and rB respectively. Which out of the following would be the correct relationship of their orbits?


Halley's Comet revolves around the sun for a time period of 76 years. The aphelion distance if perihelion is given by 8.9 × 1010 m, will be ______.

(Take, the mass of sun = 2 × 1030 kg and G = 6.67 × 10-11 Nm3/kg2)


What is one practical use of Kepler’s laws?


When is a planet moving fastest in its orbit?


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×