NCERT Exemplar Class 11
Two heavy spheres each of mass 100 kg and radius 0.10 m are placed 1.0 m apart on a horizontal table. What is the gravitational force and potential at the mid point of the line joining the centers of the spheres? Is an object placed at that point in equilibrium? If so, is the equilibrium stable or unstable?
20
Sep
Two heavy spheres each of mass 100 kg and radius 0.10 m are placed 1.0 m apart on a horizontal table. What is the gravitational force and potential at the mid point of the line joining the centers of the spheres? Is an object placed at that point in equilibrium? If so, is the equilibrium [...]
Two starts each of one solar mass (=2×10^30kg) are approaching each other for a head on collision. When they are a distance 109km. their speeds are negligible. What is the speed with which they collide? The radius of each star is 10^4km. Assume the stars to remain undistorted until they collide. (Use the known value of G).
20
Sep
Two starts each of one solar mass (=2×10^30kg) are approaching each other for a head on collision. When they are a distance 109km. their speeds are negligible. What is the speed with which they collide? The radius of each star is 10^4km. Assume the stars to remain undistorted until they collide. (Use the known value [...]
A satellite orbits the earth at a height of 400 km above the surface. How much energy must be expended to rocket the satellite out of the earth’s gravitational influence? Mass of the satellite =200 kg; mass of the earth =6. 0×10^24 kg; radius of the earth =6.4 x 10^6 m, G = 6.67 x 10^11 N-m^2/Kg^2.
20
Sep
A satellite orbits the earth at a height of 400 km above the surface. How much energy must be expended to rocket the satellite out of the earth’s gravitational influence? Mass of the satellite =200 kg; mass of the earth =6. 0×10^24 kg; radius of the earth =6.4 x 10^6 m, G = 6.67 x [...]
The escape speed of a projectile on the earth’s surface is 11.2 km `s^(-1)`. A body is projected out with thrice this speed. What is the speed of the body far away from the earth? Ignore the presence of the sun and other planets.
20
Sep
The escape speed of a projectile on the earth’s surface is 11.2 km `s^(-1)`. A body is projected out with thrice this speed. What is the speed of the body far away from the earth? Ignore the presence of the sun and other planets. How will you 'weigh the sun' that is estimate its mass? [...]
A rocket is fired vertically with a speed of 5 km s^-1 from the earth’s surface. How far from the earth does the rocket go before returning to the earth?
20
Sep
A rocket is fired vertically with a speed of 5 km s^-1 from the earth’s surface. How far from the earth does the rocket go before returning to the earth? A rocket is fired vertically with a speed of 5 km s^-1 from the earth's surface. How far from the earth does the rocket go [...]
The weight of a body on the surface of earth is 63 N. what is the gravitational force on it due to the earth at a height equal to half the radius of earth ?
20
Sep
The weight of a body on the surface of earth is 63 N. what is the gravitational force on it due to the earth at a height equal to half the radius of earth ? The weight of a body on the surface of earth is 63 N. what is the gravitational force on it [...]
A saturn year is 29.5 times the earth year. How far is the saturn from the sun if the earth is 1.50×10^8km away from the sun ?
19
Sep
A saturn year is 29.5 times the earth year. How far is the saturn from the sun if the earth is 1.50×10^8km away from the sun ? A saturn year is 29.5 times the earth year. How far is the saturn from the sun if the earth is 1.50×10^8km away from the sun ? September [...]
How will you ‘weigh the sun’, that is estimate its mass? The mean orbital radius of the earth around the sun is 1.5×10^8 km.
19
Sep
How will you ‘weigh the sun’, that is estimate its mass? The mean orbital radius of the earth around the sun is 1.5×10^8 km. How will you 'weigh the sun' that is estimate its mass? The mean orbital radius of the earth around the sun is 1.5×10^8 km. September 19, 2020 Category: Chapter 7 - [...]
A rocket is fired from the Earth towards the Sun. At what distance from the Earth’s center, the gravitational force on the rocket is zero? Mass of the Sun = 2 × 10^30kg and mass of the Earth = 6 × 10^24kg.
19
Sep
A rocket is fired from the Earth towards the Sun. At what distance from the Earth’s center, the gravitational force on the rocket is zero? Mass of the Sun = 2 × 10^30kg and mass of the Earth = 6 × 10^24kg. A rocket is fired from the Earth towards the Sun. At what distance [...]
Choose the correct answer from among the given ones: The gravitational intensity at the centre of a hemispherical shell of uniform mass density has the direction indicated by the arrow
19
Sep
Choose the correct answer from among the given ones: The gravitational intensity at the centre of a hemispherical shell of uniform mass density has the direction indicated by the arrow Choose the correct answer from among the given ones: The gravitational intensity at the centre of a hemispherical shell of uniform mass density has the [...]