NCERT Exemplar Class 11
On an open ground, a motorist follows a track that turns to his left by an angle of 60° after every 500 m. Starting from a given turn, specify the displacement of the motorist at the third, sixth and eighth turn. Compare the magnitude of the displacement with the total path length covered by the motorist in each case.
30
Oct
On an open ground, a motorist follows a track that turns to his left by an angle of 60° after every 500 m. Starting from a given turn, specify the displacement of the motorist at the third, sixth and eighth turn. Compare the magnitude of the displacement with the total path length covered by the [...]
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a motorist follows a track that turns to his left by an angle of 60° after every 500 m. Starting from a given turn ,
On an open ground ,
sixth and eighth turn. Compare the magnitude of the displacement with the total path length covered by the motorist in each case. ,
specify the displacement of the motorist at the third ,
A man walks on a straight road from his home to a market 2.5 km away with a speed of 5 km/h. Finding the market closed, he instantly turns and walks back home with a speed of 7.5 km/h . What is the (a) magnitude of average velocity, and (b) average speed of the man over the interval of time (i) 0 to 30 min, (ii) 0 to 50 min (iii) 0 to 40 min? [Note: You will appreciate from this exercise why it is better to define average speed as total path length divided by time and not as magnitude of average velocity. You would not like to tell the tired man on his return home that his average speed was zero!]
30
Oct
A man walks on a straight road from his home to a market 2.5 km away with a speed of 5 km/h. Finding the market closed, he instantly turns and walks back home with a speed of 7.5 km/h . What is the (a) magnitude of average velocity, and (b) average speed of the man [...]
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Chapter 2 - Motion in a Straight Line
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Chapter 9 - Rotation
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NCERT Exemplar Class 11
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Physics
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1) is: ,
A force of -F k acts on O ,
A man walks on a straight road from his home to a market 2.5 km away with a speed of 5 km/h. Finding the market closed ,
and (b) average speed of the man over the interval of time (i) 0 to 30 min ,
he instantly turns and walks back home with a speed of 7.5 km/h . What is the (a) magnitude of average velocity ,
respectively ,
the origin of the coordinate system. The torque about the point (1 ,
The position-time (x-t) graphs for two children A and B returning from their school O to their homes P and Q ,
Two towns A and B are connected by a regular bus service with a bus leaving in either direction every T minutes. A man cycling with a speed of 20 km/h in the direction A to B notices that a bus goes past him every 18 min in the direction of his motion, and every 6 min in the opposite direction. What is the period T of the bus service and with what speed (assumed constant) do buses ply on the road?
30
Oct
Two towns A and B are connected by a regular bus service with a bus leaving in either direction every T minutes. A man cycling with a speed of 20 km/h in the direction A to B notices that a bus goes past him every 18 min in the direction of his motion, and every [...]
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Chapter 2 - Motion in a Straight Line
,
Chapter 9 - Rotation
,
NCERT Exemplar Class 11
,
Physics
,
A jet airplane travelling at the speed of 500 kmh^1 ejects its products of combustion at the speed of 1500 kmh^1 relative to the jet plane. What is the speed of the latter with respect to an observer on the ground ?
30
Oct
A jet airplane travelling at the speed of 500 kmh^1 ejects its products of combustion at the speed of 1500 kmh^1 relative to the jet plane. What is the speed of the latter with respect to an observer on the ground ? 1) is: A force of -F k acts on O respectively the origin [...]
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Chapter 2 - Motion in a Straight Line
,
Chapter 9 - Rotation
,
NCERT Exemplar Class 11
,
Physics
,
A car moving along a straight highway with speed of 126 kmh^−1 is brought to a stop within a distance of 200 m. What is the retardation of the car (assumed uniform), and how long does it take for the car to stop ?
30
Oct
A car moving along a straight highway with speed of 126 kmh^−1 is brought to a stop within a distance of 200 m. What is the retardation of the car (assumed uniform), and how long does it take for the car to stop ? A car moving along a straight highway with speed of 126 [...]
Posted in:
Chapter 2 - Motion in a Straight Line
,
Chapter 9 - Rotation
,
NCERT Exemplar Class 11
,
Physics
,
The position-time (x-t) graphs for two children A and B returning from their school O to their homes P and Q, respectively, are shown in fig . Choose the correct entries in the brackets below. a.(A/B) Iives closer to school than (B/A). b. (A/B) starts from the school earlier than (B/A). c. (A/B) walks faster than (B/A). d. A and B reach home at the (same/different) time. e. (A//B) overtakes on the road (once/twice).
30
Oct
The position-time (x-t) graphs for two children A and B returning from their school O to their homes P and Q, respectively, are shown in fig . Choose the correct entries in the brackets below. a.(A/B) Iives closer to school than (B/A). b. (A/B) starts from the school earlier than (B/A). c. (A/B) walks faster [...]
Posted in:
Chapter 2 - Motion in a Straight Line
,
Chapter 9 - Rotation
,
NCERT Exemplar Class 11
,
Physics
,
A rocket is fired ‘vertically’ from the surface of mars with a speed of 2 kms^−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 = 6.67 x 10^-11 Nm^2/kg^2.
20
Sep
A rocket is fired ‘vertically’ from the surface of mars with a speed of 2 kms^−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 = [...]
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A rocket is fired 'vertically' from the surface of mars with a speed of 2 kms^−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 = 6.67 x 10^-11 Nm^2/kg^2. ,
A space-ship is stationed on Mars. How much energy must be expended on the spaceship to rocket it out of the solar system ? Mass of the spaceship =1000kg, Mass of the sun = 2×10^30kg. Mass of the Mars =6.4×10^23kg, Radius of Mars =3395 km. Radius of the orbit Mars =2.28×10^8 km, G = 6.67 × 10^−11 Nm^2/kg^−2.
20
Sep
A space-ship is stationed on Mars. How much energy must be expended on the spaceship to rocket it out of the solar system ? Mass of the spaceship =1000kg, Mass of the sun = 2×10^30kg. Mass of the Mars =6.4×10^23kg, Radius of Mars =3395 km. Radius of the orbit Mars =2.28×10^8 km, G = 6.67 [...]
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A space-ship is stationed on Mars. How much energy must be expended on the spaceship to rocket it out of the solar system ? Mass of the spaceship =1000kg ,
G = 6.67 × 10^−11 Nm^2/kg^−2. ,
Mass of the sun = 2×10^30kg. Mass of the Mars =6.4×10^23kg ,
Radius of Mars =3395 km. Radius of the orbit Mars =2.28×10^8 km ,
A star 2.5 times the mass of the sun and collapsed to a size of the 12km rotates with a speed of 1.5 rev per second. (Extremely compact stars of this kind are known as neutron stars. Certain observed stellar objects called pulsars are believed to belong this category ). Will an object placed on its equator remain struck to its surface due to gravity ? (Mass of the sun =2×10^30kg).
20
Sep
A star 2.5 times the mass of the sun and collapsed to a size of the 12km rotates with a speed of 1.5 rev per second. (Extremely compact stars of this kind are known as neutron stars. Certain observed stellar objects called pulsars are believed to belong this category ). Will an object placed on [...]
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
20
Sep
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 [...]
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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 ,
a geostationary satellite orbits the earth at a height of nearly 36 ,
As you have learnt in the text ,
radius = 6400 ,