University:
Cypress College
Course:
PHYS 201 C | College Physics I
Academic year:

2021
Views:

29

Pages:

30
Author:

NikkiP24

Chapter 5: Gravitation EXERCISES [PAGES 97-99 Exercises Q1. (1) | Page 97 Choose the correct option. The value of acceleration due to gravity is maximum at 1. the equator of the Earth 2. the center of the Earth 3. the pole of the Earth 4. slightly above the surface of the Earth SOLUTION The acceleration value due to gravity is maximum at the pole of the Earth. Exercises Q1. (ii)| Page 97 Choose the correct option. The weight of a particle at the center of the Earth is 1. Infinite 2. zero 3. same as that at other places 4. greater than at the poles SOLUTION The weight of a particle at the center of the Earth is zero. Exercises | Q1. (iii) | Page 97 Choose the correct option. The gravitational potential due to the Earth is minimum at 1. the center of the Earth 2. the surface of the Earth 3. points inside the Earth but not at its center, 4. infinite distance SOLUTION The gravitational potential due to the Earth is minimum at the center of the Earth. Exercises Q1. (iv) | Page 97 Choose the correct option. The binding energy of a satellite revolving around the planet in a circular orbit is 3x109 J. Its kinetic energy is 1. 6 x 10 J2. -3x109 J 3. -6 x 10 J 4.3 x 10 J SOLUTION The binding energy of a satellite revolving around the planet in a circular orbit is 3x109 J. Its kinetic energy is 3 x 10 J. Exercises Q 2. (1) Page 97 Answer the following question. State Kepler's law of equal areas. SOLUTION Statement: The line that joins a planet and the Sun sweeps equal areas in equal time intervals. P Exercises Q2. ()| Page 97 Answer the following question. State Kepler's law of the period. SOLUTION Statement: The square of the period of revolution of a planet around the Sun is proportional to the cube of the semimajor axis of the ellipse traced by the planet. Exercises | Q2. ()| Page 97 Answer the following question. What are the dimensions of the universal gravitational constant? SOLUTION The dimensions of universal gravitational constant are: LMT Exercises Q2. (iv) | Page 97 Answer the following question. Define the binding energy of a satellite SOLUTION The minimum energy required by a satellite to escape from Earth's gravitational influence is the binding energy of the satellite. Exercises | Q2. (v) | Page 97 Answer the following question. What do you mean by geostationary satellite? SOLUTION Some satellites that revolve around the Earth in the equatorial planes have the same sense of rotation as Earth's. They also have the same rotation period as that of the Earth ie, 24 hours. Due to this, these satellites appear stationary from the Earth's surface and are known as geostationary satellites. Exercises Q 2. (vi) | Page 97 Answer the following question. State Newton's law of gravitation. SOLUTION Statement: Every particle of matter attracts every other particle of matter with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between them. Exercises Q2. (vii) | Page 97 Answer the following question. Define the escape velocity of a satellite. SOLUTION The minimum velocity with which a body should be thrown vertically upwards from the surface of the Earth so that it escapes the Earth's gravitational field is called the escape velocity (v) of the body. Exercises Q 2. (viii) | Page 97 Answer the following question. What is the variation in acceleration due to gravity with altitude?