a. If the height of the orbit of a satellite from the earth surface is increased, the tangential velocity of the satellite will ……
b. The initial velocity (during launching) of the Managalyaan, must be greater than …………..of the earth.
a. If the height of the orbit of a satellite from the earth surface is increased, the tangential velocity of the satellite will decrease.
Explanation: This can be easily inferred from the formula of critical or tangential velocity.
b. The initial velocity (during launching) of the Managalyaan, must be greater than escape velocity of the earth.
a. If a spacecraft has to be sent away from the influence of earth’s gravitational field, its velocity must be less than the escape velocity.
b. The escape velocity on the moon is less than that on the earth.
c. A satellite needs a specific velocity to revolve in a specific orbit.
d. If the height of the orbit of a satellite increases, its velocity must also increase.
a. The statement is false.
This is because the minimum velocity with which the spacecraft must be projected so that it escapes the Earth’s gravitational pull is known as escape velocity.
So, the initial velocity of the spacecraft must be greater than or equal to escape velocity of Earth.
b. Escape velocity on a planet is given as:
The statement is True.
Since, acceleration due to gravity on Moon is one-sixth of that on Earth, thus the escape velocity on the Moon is less than that on the Earth.
Hence, the statement is true.
c. The specific velocity: with which the satellite revolves around a planet is known as critical velocity. It is given as
So, it can be observed that the critical velocity of a satellite changes depending on the height of the orbit from the surface of a planet.
Thus, to revolve in a specific orbit, a satellite would require specific velocity.
Hence, the statement is true.
d. The specific velocity with which the satellite revolves around a planet is known as critical velocity. It is given as
So, we see that as the height (h) of the orbit of a satellite increases, it velocity must decrease.
Hence, the statement is false.
a. What is meant by an artificial satellite? How are the satellites classified based on their functions?
b. What is meant by the orbit of a satellite? On what basis and how are the orbits of artificial satellites classified?
d. What is meant by satellite launch vehicles? Explain a satellite launch vehicle developed by ISRO with the help of a schematic diagram.
e. Why it is beneficial to use satellite launch vehicles made of more than one stage?
a. A man made object revolving around a planet in a fixed orbit is known as artificial satellites.
Based on their functions, satellites are classified as following:
|Type of satellite||Function of satellite|
|Weather satellite||Study and prediction of weather|
|Communication satellite||Establish communication betweendifferent location in the world through use of specific waves|
|Broadcast satellite||Telecasting of television programs|
|Navigational satellite||Fix the location of any place on the Earth’s surface in terms of its very precise latitude and longitude|
|Military Satellite||Collect information for security aspects|
|Earth Observation Satellite||Study of forests, deserts, oceans, polar ice on the earth’s surface, exploration and management of natural resources, observation and guidance in case of natural calamities like flood and earthquake|
b. An orbit is a specific path (elliptical or circular) or trajectory around a planet in which a satellite revolves.
Depending on the height of the satellite’s orbit above the Earth’s surface, the satellite orbits are classified as below:
High Earth Orbits (Height from the earth’s surface > 35780 km): If the height of the satellite’s orbit above the earth’s surface is greater than or equal to 35780 km, the orbit is called High earth Orbit
Medium Earth Orbit (Height above the earth’s surface 2000 km to 35780 km): If the height of the satellite orbit above the earth’s surface is in between 2000 km and 35780 km, the orbits are called medium earth orbits.
Low Earth orbit (Height above the earth’s surface: 180 km to 2000 km): If the height of the satellite orbit above the earth’s surface is in between 180 km and 2000 km, the orbits are called Low earth Orbits.
c. The geostationary satellites orbit above the equator.
Thus, these are not useful for studies of polar regions.
d. Satellite launch vehicles are used to place the satellites in their specific orbits.
The structure of polar satellite launch vehicle (PSLV) developed by ISRO is shown below.
It is a vehicle with 4 stages using solid and liquid fuels.
The weight of the vehicle decreases after each stage because of consumption of fuel at that stage and detachment of that stage (i.e. the empty tank) from its body.
Thus, the vehicle moves with higher speed after every stage.
e. The major portion of weight in satellite launch vehicles is contributed by fuel.
Thus, vehicles have to carry a large weight of fuel during their course of journey.
To overcome this problem of launch vehicles carrying heavy load during its entire journey, it is provided with more than one stage.
Because to this, the weight of the vehicle can be reduced step by step, after its launching.
For example, consider a launch vehicle having two stages.
For launching the vehicle, the fuel and engine in the first stage are used.
This imparts a specific velocity to the vehicle and takes it to a certain height.
Once the fuel in this first stage is exhausted, the empty fuel tank and the engine are detached from the main body of the vehicle and fall either into a sea or on an unpopulated land.
As the fuel in the first stage is exhausted, the fuel in the second stage is ignited.
However, the vehicle now contains only one (i.e. the second) stage.
The vehicle can move with higher speed as the weight has reduced.
a. If the mass of a planet is eight times the mass of the earth and its radius is twice the radius of the earth, what will be the escape velocity for that planet?
b. How much time a satellite in an orbit at height 35780 km above earth’s surface would take, if the mass of the earth would have been four times its original mass?
c. If the height of a satellite completing one revolution around the earth in T seconds is h1 meter, then what would be the height of a satellite taking seconds for one revolution?
Maharashtra State Board of Secondary & Higher Secondary Education (MSBSHSE) change 12th syllabus in this year 2020. Maharashtra Board also published 12th new syllabus booksin pdf format. Class 12 or HSC new Syllabus Books pdf Maharashtra Board online download 2020.
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12th new syllabus 2020 is very important for 12th standard students for self-study. Students can download online free pdf 12th Maharashtra board books..
|Maharashtra Board HSC Syllabus||Download Below Link|
|12th std new syllabus||English Yuvakbharati|
|12th std new syllabus||Marathi Yuvakbharati|
|12th std new syllabus||Hindi Yuvakbharati|
|12th std new syllabus||Kannada Yuvakbharati|
|12th std new syllabus||Urdu Yuvakbharati|
|12th std new syllabus||Telgu|
|12th std new syllabus||Sindhi|
|12th std new syllabus||Sindhi Yuvakbharati|
|12th std new syllabus||Shiksha Shastra|
|12th std new syllabus||Secretarial Practice|
|12th std new syllabus||Sanskrit|
|12th std new syllabus||Sahakar|
|12th std new syllabus||Rajyashastra|
|12th std new syllabus||pustpalan and lekhakarm|
|12th std new syllabus||Political Science|
|12th std new syllabus||Physics|
|12th std new syllabus||Paryavaran shikshan va jal suraksha|
|12th std new syllabus||Pali Pakaso|
|12th std new syllabus||Organisation of Commerce and Management|
|12th std new syllabus||Mathematics & Statistics Commerce Part 1|
|12th std new syllabus||Mathematics & Statistics Commerce Part 2|
|12th std new syllabus||Mathematics & Statistics Art & Science Part 1|
|12th std new syllabus||Mathematics & Statistics Art & Science Part 2|
|12th std new syllabus||Maharashtri Prakrit|
|12th std new syllabus||Logic|
|12th std new syllabus||Information Technology|
|12th std new syllabus||History|
|12th std new syllabus||Hindi yuvakbharati|
|12th std new syllabus||Hidayatul Arabiya|
|12th std new syllabus||Gulariya Farsi|
|12th std new syllabus||Gujarati|
|12th std new syllabus||Environment Education and Water Security|
|12th std new syllabus||Education|
|12th std new syllabus||Economics|
|12th std new syllabus||Co-Operation|
|12th std new syllabus||Chitnisachi Karypaddhati|
|12th std new syllabus||Child Development English|
|12th std new syllabus||Chemistry|
|12th std new syllabus||Book Keeping & Accountancy|
|12th std new syllabus||Biology|
|12th std new syllabus||Bengali|
|12th std new syllabus||Arthashastra|
|12th std new syllabus||Ardhamagadhi Prakrit|
IMPORTANT FOR BOARD EXAM
|Column 1||Column 2||Column 3|
iii. Atomic number
|a. Lightest and negatively charged particle in all the atoms|
b. Concentrated mass and positive charge
c. Average of the first and the third atomic mass
d. Properties of the eighth element similar to the first
e. Positive charge on the nucleus
f. Sequential change in molecular formulae
|Column 1||Column 2||Column 3|
|i. Triad||a. Average of the first and the third atomic mass||1.Dobereiner|
|ii. Octave||b. Properties of the eighth element similar to the first||2.Newlands|
|iii. Atomic number||c. Positive charge on the nucleus||3.Mendeleev|
|iv. Period||d. Sequential change in molecular formulae||4.Moseley|
|v. Nucleus||e. Concentrated mass and positive charge||5.Rutherford|
|vi. Electron||f. Lightest and negatively charged particle in all the atoms||6.Thomson|
|MASS||m/s2||Zero at the Centre|
|WEIGHT||kg||Measure of inertia|
|ACCELARATION DUE TO GRAVITY||Nm2/kg2||same in the entire universe|
|GRAVITATIONAL CONSTANT||N||Depends on the height|
|MASS||kg||Measure of inertia|
|WEIGHT||N||Zero at the Centre|
|ACCELARATION DUE TO GRAVITY||m/s2||Depends on the height|
|GRAVITATIONAL CONSTANT||Nm2/kg2||same in the entire universe|
|Mass is the amount of matter contained in a body.||Weight is the force exerted on a body due to the gravitational pull of another body such as Earth, the sun and the moon.|
|Mass is an intrinsic property of a body.||Weight is an extrinsic property of a body.|
|Mass is the measure of inertia. ||Weight is the measure of force.|
|The mass of a body remains the same everywhere in the universe.||The weight of a body depends on the local acceleration due to gravity where it is placed.|
|The mass of a body cannot be zero.||The weight of a body can be zero.|