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, 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 [...]
Posted in:
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 [...]
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 uniform circular disc of radius r is placed on a rough horizontal surface and given a linear velocity v0 and angular velocity ω0 as shown. The disc comes to rest after moving some distance to the right. It follows that
30
Oct
A uniform circular disc of radius r is placed on a rough horizontal surface and given a linear velocity v0 and angular velocity ω0 as shown. The disc comes to rest after moving some distance to the right. It follows that 1) is: A force of -F k acts on O the origin of the [...]
A solid sphere of mass M and radius R is placed on a rough horizontal surface. It is stuck by a horizontal cues stick at a height h above the surface. The value of h so that the sphere performs pure rolling motion immediately after it has been stuck is
30
Oct
A solid sphere of mass M and radius R is placed on a rough horizontal surface. It is stuck by a horizontal cues stick at a height h above the surface. The value of h so that the sphere performs pure rolling motion immediately after it has been stuck is 1) is: A force of [...]
The spool shown in the figure is placed on a rough horizontal surface and has inner radius `r` and outer radius `R`. The angle `theta` between the applied force and the horizontal can be varied. The critical angle `theta` for which the spool does not roll and remains stationary is given by
30
Oct
The spool shown in the figure is placed on a rough horizontal surface and has inner radius `r` and outer radius `R`. The angle `theta` between the applied force and the horizontal can be varied. The critical angle `theta` for which the spool does not roll and remains stationary is given by 1) is: A [...]
A string is wrapped several times around a solid cylinder of mass m and radius r, which rotates about a stationary horizontal axis. The free end of the spring is pulled by constant force F. The cylinder rotates without slipping. the cylinder is initially at rest. Find the angular speed of the cylinder and the speed of the cable when the free end of the cable has been pulled out by a length s.
30
Oct
A string is wrapped several times around a solid cylinder of mass m and radius r, which rotates about a stationary horizontal axis. The free end of the spring is pulled by constant force F. The cylinder rotates without slipping. the cylinder is initially at rest. Find the angular speed of the cylinder and the [...]
A uniform triangular plate `ABC of` moment of mass `m` and inertia `I` (about an axis passing through `A` and perpendicular to plane of the plate) can rotate freely in the vertical plane about point `’A’` as shown in figure. The plate is released from the position shown in the figure. Line `AB` is horizontal. The acceleration of centre of mass just after the release of plate is
30
Oct
A uniform triangular plate `ABC of` moment of mass `m` and inertia `I` (about an axis passing through `A` and perpendicular to plane of the plate) can rotate freely in the vertical plane about point `’A’` as shown in figure. The plate is released from the position shown in the figure. Line `AB` is horizontal. [...]
A uniform bar AB of mass m and a ball of the same mass are released from rest from the same horizontal position. The bar hinged at end A. There is gravity downwards. What is the distance of the point from point B that has the same acceleration as that of ball, immediately after release ?
30
Oct
A uniform bar AB of mass m and a ball of the same mass are released from rest from the same horizontal position. The bar hinged at end A. There is gravity downwards. What is the distance of the point from point B that has the same acceleration as that of ball, immediately after release [...]