Questions by varun

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Answer the following : You can shield a charge from electrical forces by putting it inside a hollow conductor. Can you shield a body from the gravitational influence of nearby matter by putting it inside a hollow sphere or by some other means

asked Mar 19, 2022 in 11th Physics

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Answer the following : An astronaut inside a small space ship orbiting around the earth cannot detect gravity. If the space station orbiting around the earth has a large size, can he hope to detect gravity

asked Mar 19, 2022 in 11th Physics

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Answer the following : If you compare the gravitational force on the earth due to the sun to that due to the moon, you would find that the Sun’s pull is greater than the moon’s pull. (you can check this yourself using the data available in the succeeding exercises).

asked Mar 19, 2022 in 11th Physics

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Choose the correct alternative : (a) Acceleration due to gravity increases/decreases with increasing altitude. (b) Acceleration due to gravity increases/decreases with increasing depth (assume the earth to be a sphere of uniform density). (c) Acceleration due to gravity is independent of mass of the earth/mass of the body. (d) The formula –G Mm(1/`r_2` – 1/`r_1`) is more/less accurate than the formula mg(`r_2 – r_1`) for the difference of potential energy between two points `r_2` and `r_1` distance away from the centre of the

asked Mar 19, 2022 in 11th Physics

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Suppose there existed a planet that went around the sun twice as fast as the earth. What would be its orbital size as compared to that of the earth

asked Mar 19, 2022 in 11th Physics

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Io, one of the satellites of Jupiter, has an orbital period of 1.769 days and the radius of the orbit is `4.22 × 10^8` m. Show that the mass of Jupiter is about one-thousandth that of the

asked Mar 19, 2022 in 11th Physics

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Let us assume that our galaxy consists of `2.5 × 10^(11)` stars each of one solar mass. How long will a star at a distance of 50,000 ly from the galactic centre take to complete one revolution ? Take the diameter of the Milky Way to be `10^5`

asked Mar 19, 2022 in 11th Physics

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Choose the correct alternative: (a) If the zero of potential energy is at infinity, the total energy of an orbiting satellite is negative of its kinetic/potential energy. (b) The energy required to launch an orbiting satellite out of earth’s gravitational influence is more/less than the energy required to project a stationary object at the same height (as the satellite) out of earth’s

asked Mar 19, 2022 in 11th Physics

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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

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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

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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

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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

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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

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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

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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

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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

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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

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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

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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

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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

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