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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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Find the time period of mass M when displaced from its equilibrium positon and then released for the system shown in Fig

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

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Show that the motion of a particle represented by `y = sinω t – cos ω t` is simple harmonic with a period of

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

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Find the displacement of a simple harmonic oscillator at which its P.E. is half of the maximum energy of the

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

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A body of mass m is situated in a potential field `U(x) = U_0 (1-cos αx) when U_0 and α` are constants. Find the time period of small

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

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A mass of 2 kg is attached to the spring of spring constant 50 Nm–1. The block is pulled to a distance of 5cm from its equilibrium position at x = 0 on a horizontal frictionless surface from rest at t = 0. Write the expression for its displacement at anytime

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

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Consider a pair of identical pendulums, which oscillate with equal amplitude independently such that when one pendulum is at its extreme position making an angle of 2° to the right with the vertical, the other pendulum makes an angle of 1° to the left of the vertical. What is the phase difference between the

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

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Let a, b, c be the three rational numbers where `a=2/3`, `b=4/5` and `c= -5/6` Verify: a + (b + c) = (a + b) +c (Associative property of

asked Jan 18, 2022 in 8th-maths by nikhil (1.8k points)

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Let a, b, c be the three rational numbers where `a=2/3`, `b=4/5` and `c= -5/6` Verify: `axx(bxxc) = (axxb)xxc` (Associative property of

asked Jan 18, 2022 in 8th-maths by krutika (1.7k points)

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Solve the following questions and write your observations.

asked Jan 18, 2022 in 8th-maths by krutika (1.7k points)

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Solve the following questions and write your observations. (i)`3/7 + 0 = ?` (ii) `2/3 xx 1 =

asked Jan 18, 2022 in 8th-maths by yogita (1.8k points)

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Solve the following questions and write your observations. `(i) (-6)/7 xx 1 = ?` (vi) `9/8 × 1 =

asked Jan 18, 2022 in 8th-maths by krutika (1.7k points)

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Write any 5 rational numbers between `-5/6` and `7/8`

asked Jan 18, 2022 in 8th-maths by krutika (1.7k points)

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Identify the rational number which is different from the other three : `2/3,-4/5,1/2,1/3`. Explain your

asked Jan 18, 2022 in 8th-maths by krutika (1.7k points)

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Problem Solving StrategiesProblem : The product of two rational numbers is –7. If one of the number is –10, find the

asked Jan 18, 2022 in 8th-maths by nishit (1.8k points)

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Verify the property x × y = y × z of rational numbers by using x = 7 and

asked Jan 18, 2022 in 8th-maths by uday (1.6k points)

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Verify the property x × y = y × z of rational numbers by using x = `2/3` and y =

asked Jan 18, 2022 in 8th-maths by uday (1.6k points)

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