NCERT Exemplar Class 11
An engine is attached to a wagon through a shock absorber of length 1.5 m. The system with a total mass of 50,000 kg is moving with a speed of 36 km/h when the brakes are applied to bring it to rest. In the process of the system being brought to rest, the spring of the shock absorber gets compressed by 1.0 m. If 90% of energy of the wagon is lost due to friction, calculate the spring constant.
09
Nov
An engine is attached to a wagon through a shock absorber of length 1.5 m. The system with a total mass of 50,000 kg is moving with a speed of 36 km/h when the brakes are applied to bring it to rest. In the process of the system being brought to rest, the spring of [...]
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000 kg is moving with a speed of 36 km/h when the brakes are applied to bring it to rest. In the process of the system being brought to rest ,
An engine is attached to a wagon through a shock absorber of length 1.5 m. The system with a total mass of 50 ,
calculate the spring constant. ,
the spring of the shock absorber gets compressed by 1.0 m. If 90% of energy of the wagon is lost due to friction ,
Suppose the average mass of raindrops is 3.0×10^−5 kg and their average terminal velocity 9ms^−1. Calculate the energy transferred by rain to each square metre of the surface at the place which receives 100 cm of rain in a year.
09
Nov
Suppose the average mass of raindrops is 3.0×10^−5 kg and their average terminal velocity 9ms^−1. Calculate the energy transferred by rain to each square metre of the surface at the place which receives 100 cm of rain in a year. one gradual and the other steep meet at A from where two stones are allowed [...]
Two pendulums with identical bobs and length are suspended from a common support such that in rest position the two bobs are in contact. One of the bobs is released after being displaced by 10^o so that it collides elastically head on with the other bob. (a) Describe the motion of two bobs. (b) Draw a graph showing variation in energy of either pendulum with time, for 0 ≤ t ≤ 2T, where T is the period of each pendulum.
09
Nov
Two pendulums with identical bobs and length are suspended from a common support such that in rest position the two bobs are in contact. One of the bobs is released after being displaced by 10^o so that it collides elastically head on with the other bob. (a) Describe the motion of two bobs. (b) Draw [...]
A raindrop of mass 1.00 g falling from a height of 1 km hits the ground with a speed of 50 m s^–1. Calculate (a) the loss of P.E. of the drop. (b) the gain in K.E. of the drop. (c) Is the gain in K.E. equal to loss of P.E.? If not why. Take g = 10 m s^2
09
Nov
A raindrop of mass 1.00 g falling from a height of 1 km hits the ground with a speed of 50 m s^–1. Calculate (a) the loss of P.E. of the drop. (b) the gain in K.E. of the drop. (c) Is the gain in K.E. equal to loss of P.E.? If not why. Take [...]
The bob A of a pendulum released from horizontal to the vertical hits another bob B of the same mass at rest on a table as shown in figure. If the length of the pendulum is 1m, calculate (a) the height to which bob A will rise after collision. (b) the speed with which bob B starts moving. Neglect the size of the bobs and assume the collision to be elastic.
09
Nov
The bob A of a pendulum released from horizontal to the vertical hits another bob B of the same mass at rest on a table as shown in figure. If the length of the pendulum is 1m, calculate (a) the height to which bob A will rise after collision. (b) the speed with which bob [...]
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calculate (a) the height to which bob A will rise after collision. (b) the speed with which bob B starts moving. Neglect the size of the bobs and assume the collision to be elastic. ,
The bob A of a pendulum released from horizontal to the vertical hits another bob B of the same mass at rest on a table as shown in figure. If the length of the pendulum is 1m ,
Consider a one-dimensional motion of a particle with total energy E. There are four regions A, B, C and D is which the relation between potential energy U, kinetic energy (K) and total energy E is as given below Region A:V>E Region B:V
09
Nov
Consider a one-dimensional motion of a particle with total energy E. There are four regions A, B, C and D is which the relation between potential energy U, kinetic energy (K) and total energy E is as given below Region A:V>E Region B:V B C and D is which the relation between potential energy U [...]
A ball of mass m, moving with a speed 2v0, collides inelastically (e > 0) with an identical ball at rest. Show that (a) For head-on collision, both the balls move forward. (b) For a general collision, the angle between the two velocities of scattered balls is less than 90°.
09
Nov
A ball of mass m, moving with a speed 2v0, collides inelastically (e > 0) with an identical ball at rest. Show that (a) For head-on collision, both the balls move forward. (b) For a general collision, the angle between the two velocities of scattered balls is less than 90°. A ball of mass m [...]
A graph of potential energy V(x) verses x is shown in figure. A particle of energy E0 is executing motion in it. Draw graph of velocity and kinetic energy versus x for one complete cycle AFA.
09
Nov
A graph of potential energy V(x) verses x is shown in figure. A particle of energy E0 is executing motion in it. Draw graph of velocity and kinetic energy versus x for one complete cycle AFA. A graph of potential energy V(x) verses x is shown in figure. A particle of energy E0 is executing [...]
A bob of mass m suspended by a light string of length L is whirled into a vertical circle as shown in figure. What will be the trajectory of the particle if the string is cut at
09
Nov
A bob of mass m suspended by a light string of length L is whirled into a vertical circle as shown in figure. What will be the trajectory of the particle if the string is cut at A bob of mass m suspended by a light string of length L is whirled into a vertical [...]
Two bodies of unequal mass are moving in the same direction with equal kinetic energy. The two bodies are brought to rest by applying retarding force of same magnitude. How would the distance moved by them before coming to rest compare?
09
Nov
Two bodies of unequal mass are moving in the same direction with equal kinetic energy. The two bodies are brought to rest by applying retarding force of same magnitude. How would the distance moved by them before coming to rest compare? A man of mass m standing at the bottom of the staircase of height [...]