Chapter 2 – Motion in a Straight Line

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Among the four graphs, there is only one graph for which average velocity over the time interval (0, T) can vanish for a suitably chosen T. Which one is it?
30
Oct
Among the four graphs, there is only one graph for which average velocity over the time interval (0, T) can vanish for a suitably chosen T. Which one is it? Among the four graphs T) can vanish for a suitably chosen T. Which one is it? there is only one graph for which average velocity [...]
Posted in: Chapter 2 - Motion in a Straight Line , NCERT Exemplar Class 11 , Physics ,
Tags: Among the four graphs , T) can vanish for a suitably chosen T. Which one is it? , there is only one graph for which average velocity over the time interval (0 ,
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 [...]
Posted in: Chapter 2 - Motion in a Straight Line , Chapter 9 - Rotation , NCERT Exemplar Class 11 , Physics ,
Tags: 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 [...]
Posted in: Chapter 2 - Motion in a Straight Line , Chapter 9 - Rotation , NCERT Exemplar Class 11 , Physics ,
Tags: 1) is: , A force of -F k acts on O , 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 ,
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 [...]
Posted in: Chapter 2 - Motion in a Straight Line , Chapter 9 - Rotation , NCERT Exemplar Class 11 , Physics ,
Tags: 1) is: , A force of -F k acts on O , 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 ,
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 ,
Tags: 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 ? ,
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 ,
Tags: 1) is: , A force of -F k acts on O , 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 ,