For the above problem, the direction of the gravitational intensity at an arbitrary point P is indicated by the arrow (i) d, (ii), e, (iii) f (iv) g. … Thus, earth’s distance from the sun and speed as it moves around the sun varies from day to day. Here we have given NCERT Exemplar Class 11 Physics Chapter 7 Gravitation. Sidereal day is the time interval between two successive transit of a distant star through the zenith point (meridian). Question 8. (a) Acceleration due to gravity decreases with increasing altitude. A star 2.5 times the mass of the sun and collapsed to a size of 12 km rotates with a speed of 1.2 rev. (c) Acceleration due to gravity increases with increasing latitude. (d) Gravitational mass of a particle like proton can depend on the presence of neighouring heavy objects but the inertial mass cannot. Answer: We hope the NCERT Solutions for Class 11 Physics Chapter 8 Gravitation help you. (d) will move in orbits like planets and obey Kepler’s laws. (d) Kinetic energy does not remain constant. (c) will be same everywhere in magnitude directed towards the centre. 11. An object of mass m is raised from the surface of the earth to a height equal to the radius of the earth, that is, taken from a distance R to 2R from the centre of the earth. 23. (a) Acceleration due to gravity increases/decreases with increasing altitude. (a) Inertial mass is a measure of difficulty of accelerating a body by an external force whereas the gravitational mass is relevant in determining the gravitational force on it by an external mass. Register online for Physics tuition on Vedantu.com to score more marks in your Examination. Physics Important Questions Class 11 are given below. The value of G is independent of the nature and size of the bodies well as the nature of the medium between them. Gravitational forces are independent of medium. (d) Space also has orientation. 1. m is much-much smaller than M and at time t = 0, they are all at rest (Fig. By drawing appropriate diagram showing earth’s spin and orbital motion, show that mean solar day is four minutes longer than the sidereal day. Different points in earth are at slightly different distances from the sun and hence experience different forces due to gravitation. 22. NCERT Solutions; _Class 6; _Class 7; _Class 8; _Class 9; _Class 10; __NCERT Solutions for Class 10 Maths; _Class 11; ... 11. (b) Find out the minimum number of satellites that are needed to cover entire earth so that at least one satellites is visible from any point on the equator. (a) all three of Kepler’s laws would still be valid. .•. From equation (i), the acceleration due to the gravity of the star (b) The escape speed does not depend on the location from where a body is projected. (d) the torque causes the earth to move around the sun. (c) The escape speed does not depend on the direction of projection of a body. When the comet is far away from the sun, its speed is very less. (b) Acceleration due to gravity increases/decreases with increasing depth (assume the Earth to be a sphere of uniform density). This is because. Can we shield a body from the gravitational influence of nearby matter by putting it inside a hollow sphere or by some other means? Can you shield a body from the gravitational influence of nearby matter by putting it inside a hollow sphere or by some other means? CBSE Important Questions for Class 11 Physics, NCERT Important Questions for Class 11 Physics, NCERT Solutions for Class 8 Sanskrit Chapter 11 सावित्री बाई फुले, NCERT Solutions for Class 12th Macroeconomics : Chapter 6 – Open Economy Macroeconomics, Class 11 Important Questions for Physics - Mechanical Properties of Solids, The earth is an approximate sphere. QUESTIONS FROM TEXTBOOK. Mass of the spaceship = 1000 kg, Mass of the Sun = 2 x 1030 kg. (b) An astronaut inside a small spaceship orbiting around the Earth cannot detect gravity. The term gravity is used for gravitation, but gravitation is defined as the theory that explains the attraction while gravity is defined as the force that pulls objects towards each other. Io, one of the satellites of Jupiter, has an orbital period of 1.769 days and the radius of the orbit is 4.22 x 108 m. Show that the mass of Jupiter is about one-thousandth that of the Sun. But it is the apple that falls towards the earth and not vice-versa. Extra Questions for Class 9 Science Chapter 10 Gravitation with Answers Solutions. (orbital radius = 1.5 x 1011 m). A body cannot be shielded from the gravitational influence of nearby matter. Multiple Choice Questions (MCQ I) A Saturn year is 29.5 times the Earth year. An astronaut inside a small spaceship orbiting around the earth cannot detect gravity. Gravitation Class 11 MCQs Questions with Answers. Before starting with Gravitation Class 11, it is crucial to understand that gravity and gravitation are not similar. (c) Due to more blood supply to face, the astronaut may get headache. NCERT solutions Class 11 Physics Chapter 8 Gravitation is a vital resource you must refer to score good marks in the Class 11 examination. Six point masses of mass m each are at the vertices of a regular hexagon of side l. Calculate the force on any of the masses. Choose the correct alternative: Gravitation Class 11 is an essential chapter for scoring the best grades in your examination. Important Points about Gravitation Force (i) Gravitational force is a central as well as conservative force. 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. Question 8. = 6400 + 36000 = 42400 km = 4.24 x 107 m. Question 8. Here M is the mass and R is the radius of the star. (d) deviates considerably from being elliptical due to influence of planets other than earth. If the gravitational field is supposed to be uniform, the work done in moving a 2 kg mass from the surface of the planet to a height of 8 m is (a) Gravitational Force (b) Electrostatic Force (c) Magnetic Force (d) None. Answer: Acceleration due to gravity of the star,g= GM/R2 …………(i) Class 9 Physics Notes - Chapter 5 - Gravitation - Numerical Problems. Is it possibe for a body to have inertia but no weight? Answer:  Let gh be the acceleration due to gravity at a height equal to half the radius of the Earth (h = R/2) and g its value on Earth’s surface. Practice Now. How far from the earth does the rocket go before returning to the earth? All topics preceding Ch 8 physics class 11 are based on the concepts you’re going to learn from this chapter. Due to zero gravitational intensity, the gravitational forces acting on any particle at any point inside a spherical shell will be symmetrically placed. Answer: Mass of Sun, M = 2 x 1030 kg; Mass of Earth, m = 6 x 1024 kg Distance between Sim and Earth, r = 1.5 x 1011 m As observed from earth, the sun appears to move in an approximate circular orbit. Question 8. You are expected to do all the questions based on this to remain competitive in IIT JEE examination. Answer: (a) The blood flow in feet would be lesser in zero gravity. NCERT Solutions Class 11 Physics Physics Sample Papers. (c) not be true because the major gravitational force on mercury is due to sun. (c) only the third law will become invalid. 1. (d) The formula – GMm (1/r2-1/r1) is more/less accurate than the formula mg (r2 – r1) for the difference of potential energy between two points r2 and r1 distance away from the centre of the Earth. Hence, orientational problem will affect the astronaut in space. Answer:  (a) If the zero of potential energy is at infinity, the total energy of an orbiting satellite is negative of its kinetic energy. If the size of the spaceship is extremely large, then the gravitational effect of the spaceship may become measurable. When the stars are about to collide, the distance between their centres, r’ = 2 R. They. (a) are always at the same point for any size of the body. (b) we will become hotter after billions of years. (b) are always at the same point only for spherical bodies. Mass of the satellite = 200 kg; mass of the earth = 6.0 x  1024 kg; radius of the earth = 6.4 x  106 m; G = 6.67 x  10-11 N m2 kg-2. If 20% of its initial energy is lost due to Martian atmospheric resistance, how far will the rocket go from the surface of mars before returning to it? (f) Total energy throughout the orbit remains constant. So, the astronaut will not get swollen feet. 15. Which of the following options are correct? (a) the solar cells and batteries in satellites run out. Answer: (a) decreases NCERT Solutions for Class 6, 7, 8, 9, 10, 11 and 12. Earth’s orbit is an ellipse with eccentricity 0.0167. If the sun and the planets carried huge amounts of opposite charges. A: 6.67 * 10-6 cgs unit. Go Back to Physics Home Page Chemistry Maths Biology. Why? Draw areal velocity versus time graph for mars. (b) will not be strictly elliptical because the total gravitational force on it is not central. 2 ] What is the gravitational force between the Sun and the Earth? Here we have given NCERT Solutions for Class 11 Physics Chapter 8 Gravitation. If the space station orbiting around the Earth has a large size, can he hope to detect gravity? There are around 3-5 solved test papers in each chapter. Question 8. A rocket is fired from the earth towards the sun. NCERT Solutions for Class 11 Physics Chapter 8 Gravitation are part of Class 11 Physics NCERT Solutions. Question 9. Take the diameter of the Milky way to be 105 ly. NCERT Exemplar Class 11 Physics Chapter 7 Gravitation are part of NCERT Exemplar Class 11 Physics. Which ones amongst them can be applied R.: shield a body can not be from... No gravitational force on mercury is influenced by forces other than earth way because of small... That exists between the objects also have the frames of reference in space by gravitational force it... Sidereal day is the gravitational force of the solar system, the inter-planetary region has chunks of (! Weigh the sun in closed orbits but not directed towards the centre 5 km s-1 the. 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