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Does the escape speed of a body from the earth depend on (a) the mass of the body, (b) the location from where it is projected, (c) the direction of projection, (d) the height of the location from where the body is

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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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

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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Which of the following symptoms is likely to afflict an astronaut in space (a) swollen feet, (b) swollen face, (c) headache, (d) orientational

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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In the following two exercises, 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 (see Fig 8.12) (i) a, (ii) b, (iii) c, (iv) 0.

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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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)

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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A rocket is fired from the earth towards the sun. At what distance from the earth’s centre is the gravitational force on the rocket zero ? Mass of the sun = `2×10^(30)` kg, mass of the earth = `6×10^(24)` kg. Neglect the effect of other planets etc. (orbital radius = `1.5 × 10^(11)`

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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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`

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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A saturn year is 29.5 times the earth year. How far is the saturn from the sun if the earth is `1.50 × 10^8` km away from the sun

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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A body weighs 63 N on the surface of the earth. What is the gravitational force on it due to the earth at a height equal to half the radius of the earth

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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Assuming the earth to be a sphere of uniform mass density, how much would a body weigh half way down to the centre of the earth if it weighed 250 N on the surface

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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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 ? Mass of the earth = `6.0 × 10^(24)` kg; mean radius of the earth = `6.4 × 10^6`m; G = `6.67 × 10^(–11)` N `m^2`

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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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

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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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 = 6.0×1024 kg; radius of the earth = `6.4 × 10^6` m; G = `6.67 × 10^(–11)` N `m^2`

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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Two stars each of one solar mass (= `2×10^(30)` kg) are approaching each other for a head on collision. When they are a distance 109 km, their speeds are negligible. What is the speed with which they collide ? The radius of each star is `10^4` km. Assume the stars to remain undistorted until they collide. (Use the known value of

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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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 centres of the spheres ? Is an object placed at that point in equilibrium? If so, is the equilibrium stable or unstable

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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As you have learnt in the text, a geostationary satellite orbits the earth at a height of nearly 36,000 km from the surface of the earth. What is the potential due to earth’s gravity at the site of this satellite ? (Take the potential energy at infinity to be zero). Mass of the earth = `6.0×10^(24)` kg, radius = 6400

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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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. per second. (Extremely compact stars of this kind are known as neutron stars. Certain stellar objects called pulsars belong to this category). Will an object placed on its equator remain stuck to its surface due to gravity ? (mass of the sun = `2×10^(30)`

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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A spaceship is stationed on Mars. How much energy must be expended on the spaceship to launch it out of the solar system ? Mass of the space ship = 1000 kg; mass of the sun = `2×10^(30)` kg; mass of mars = `6.4×10^(23)` kg; radius of mars = 3395 km; radius of the orbit of mars = `2.28 ×10^8` km; G = `6.67 × 10^(–11)` N `m^2`

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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A rocket is fired ‘vertically’ from the surface of mars with a speed of 2 km s–1. 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 ? Mass of mars = `6.4×10^(23)` kg; radius of mars = 3395 km; G = G = `6.67 × 10^(–11)` N `m^2`

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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What is the moment of inertia of a disc about one of its

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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