Q. 155.0( 1 Vote )
Consider earth satellites in circular orbits. A geostationary satellite must be at a height of about 36000 Km from the earth’s surface. Will any satellite moving at this height be a geostationary satellite? Will any satellite moving at this height have a time period of 24 hours?
To be a geostationary satellite, the time period of its revolution should be equal to the time period of earth’s rotation. To achieve this, the radius should be equal to approximately 36000 kms. The inclination of a satellite can vary, but the radius should be maintained.
From the equation of time period, the period of revolution comes about 24 hrs. for a height of 36000 kms (42400 km from the center of the earth).
Rate this question :
A mass of 6 × 1024 Kg (equal to the mass of the earth) is to be compressed in a sphere in such a way that the escape velocity from its surface is 3 × 108 ms-1. What should be the radius of the sphere?HC Verma - Concepts of Physics Part 1
A particle is fired vertically upward with a speed of 15 km s-1. With what speed will it move in interstellar space. Assume only earth’s gravitational field.HC Verma - Concepts of Physics Part 1
A satellite is in an elliptic orbit around the earth with aphelion of 6R and perihelion of 2 R where R = 6400 km is the radius of the earth. Find eccentricity of the orbit. Find the velocity of the satellite at apogee and perigee. What should be done if this satellite has to be transferred to a circular orbit of radius 6R?
[G = 6.67 × 10 - 11 SI units and M = 6 × 1024 kg]
Physics - Exemplar
A satellite is to be placed in equatorial geostationary orbit around earth for communication.
(a) Calculate height of such a satellite.
(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.
[M = 6 × 1024 kg, R = 6400 km, T = 24h, G = 6.67 × 10 - 11 SI units]
Physics - Exemplar
Which of the following are true?Physics - Exemplar
Two satellites A and B move round the earth in the same orbit. The mass of B is twice the mass of A.HC Verma - Concepts of Physics Part 1
A particle is kept at rest at a distance R (earth’s radius) above the earth’s surface. The minimum speed with which it should be protected so that it does not return isHC Verma - Concepts of Physics Part 1
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 × 1024 kg; mean radius of the earth = 6.4 × 106 m; G = 6.67 × 10–11 N m2 kg–2.NCERT - Physics Part-I
Give one example each of central force and non - central force.Physics - Exemplar
The time period of an earth-satellite in circular orbit is independent ofHC Verma - Concepts of Physics Part 1