The upward force on the box that maintains it in its position when the boy walks on a horizontal level road is provided by the boy himself. The horizontal displacement takes place when the boy walks forward. In physics, work is the product of the force applied in the direction of the displacement. FRead more
The upward force on the box that maintains it in its position when the boy walks on a horizontal level road is provided by the boy himself. The horizontal displacement takes place when the boy walks forward. In physics, work is the product of the force applied in the direction of the displacement. For work to be done, a component of the force must exist in the direction of movement. In this case, the force exerted by the boy on the box is vertical, while his movement is horizontal. Since these two directions are perpendicular to each other, the work done on the box is considered zero. It is important to note that although the boy may feel fatigued from carrying the box, this is not an indication of work being done in the physics sense.
Thus, although the boy exerts himself to keep the box in its place, he is doing no work on the box during the walk. This example represents a simple idea in physics: the difference between the colloquial use of the word “work” and its technical definition in science. To summarize, if the boy is carrying a box, he is doing no work on the box.
When a bullet strikes and penetrates into a solid block placed on a frictionless surface, the process it goes through will be that which emphasizes important principles of conservation of momentum and energy. Here, the system is the bullet and the block, assumed to be isolated from all external forcRead more
When a bullet strikes and penetrates into a solid block placed on a frictionless surface, the process it goes through will be that which emphasizes important principles of conservation of momentum and energy. Here, the system is the bullet and the block, assumed to be isolated from all external forces acting in the horizontal direction. Therefore, the total momentum of the system at the beginning is equal to the total momentum of the system after the collision; thus, the momentum is conserved.
However, it is significant to note that kinetic energy is not conserved in this process. The collision between the bullet and the block is an example of an inelastic collision, in which the two objects stick together after impact. During this interaction, part of the bullet’s kinetic energy is transformed into other forms of energy such as heat and sound. Because of this, whereas the system’s momentum remains invariant during the collision, the kinetic energy is reduced.
In summary, when the bullet is embedded in the block, only momentum is conserved, while kinetic energy is lost in the process. This illustrates the fundamental differences between momentum and kinetic energy conservation in collision events.
According to Kepler's law of periods, the square of the orbital period of a planet (T²) is directly proportional to the cube of the semi-major axis of its orbit (r³). This relationship can be expressed as the ratio of the periods and radii of two planets. For example, if one planet's radius is fourRead more
According to Kepler’s law of periods, the square of the orbital period of a planet (T²) is directly proportional to the cube of the semi-major axis of its orbit (r³). This relationship can be expressed as the ratio of the periods and radii of two planets. For example, if one planet’s radius is four times that of another, the ratio of their periods squared is equal to the ratio of their radii cubed. This leads to the conclusion that the period of the second planet is eight times longer than the first.
Thus, if the first period is 5 hours, the second period will be 40 hours.
According to Kepler’s law of periods,
T² ∝ r³
(T₂/T₁)² = (r₂/r₁)³ = (4/1)³ = 64
T₂ = 8T₁ = 8 x 5 = 40 h.
In a representative democracy, elected representatives play a crucial role as: (b) They are accountable to the public and make decisions on behalf of their constituents. Explanation: Elected representatives represent the interests of the people who voted for them. They make decisions, formulate poliRead more
In a representative democracy, elected representatives play a crucial role as:
(b) They are accountable to the public and make decisions on behalf of their constituents.
Explanation:
Elected representatives represent the interests of the people who voted for them. They make decisions, formulate policies, and pass laws that reflect the needs and preferences of their constituents. Their accountability to the public is essential, as they can be replaced in elections if the electorate is dissatisfied with their performance or decisions.
(i) The consumer right violated in the instance of selling soft drinks at a higher price is the 'Right to Fair and Transparent Trade Practices'. Charging an inflated price for soft drinks breaches this right, ensuring fair trade practices for consumers. (ii) The likely invoked consumer right in respRead more
(i) The consumer right violated in the instance of selling soft drinks at a higher price is the ‘Right to Fair and Transparent Trade Practices’. Charging an inflated price for soft drinks breaches this right, ensuring fair trade practices for consumers.
(ii) The likely invoked consumer right in response to the complaints is the ‘Right to Seek Redressal’. This empowers consumers to seek remedy against unfair trade practices. The complaint prompted authorities to take action, demonstrating the exercise of this consumer right.
A boy carrying a box on his head is walking on a level load from one place to another on a straight road is doing no work.
The upward force on the box that maintains it in its position when the boy walks on a horizontal level road is provided by the boy himself. The horizontal displacement takes place when the boy walks forward. In physics, work is the product of the force applied in the direction of the displacement. FRead more
The upward force on the box that maintains it in its position when the boy walks on a horizontal level road is provided by the boy himself. The horizontal displacement takes place when the boy walks forward. In physics, work is the product of the force applied in the direction of the displacement. For work to be done, a component of the force must exist in the direction of movement. In this case, the force exerted by the boy on the box is vertical, while his movement is horizontal. Since these two directions are perpendicular to each other, the work done on the box is considered zero. It is important to note that although the boy may feel fatigued from carrying the box, this is not an indication of work being done in the physics sense.
Thus, although the boy exerts himself to keep the box in its place, he is doing no work on the box during the walk. This example represents a simple idea in physics: the difference between the colloquial use of the word “work” and its technical definition in science. To summarize, if the boy is carrying a box, he is doing no work on the box.
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See lesshttps://www.tiwariacademy.com/ncert-solutions/class-11/physics/chapter-5/
A bullet hits gets embedded in a solid block resting on a frictionless surface. In this process which one of the following is correct?
When a bullet strikes and penetrates into a solid block placed on a frictionless surface, the process it goes through will be that which emphasizes important principles of conservation of momentum and energy. Here, the system is the bullet and the block, assumed to be isolated from all external forcRead more
When a bullet strikes and penetrates into a solid block placed on a frictionless surface, the process it goes through will be that which emphasizes important principles of conservation of momentum and energy. Here, the system is the bullet and the block, assumed to be isolated from all external forces acting in the horizontal direction. Therefore, the total momentum of the system at the beginning is equal to the total momentum of the system after the collision; thus, the momentum is conserved.
However, it is significant to note that kinetic energy is not conserved in this process. The collision between the bullet and the block is an example of an inelastic collision, in which the two objects stick together after impact. During this interaction, part of the bullet’s kinetic energy is transformed into other forms of energy such as heat and sound. Because of this, whereas the system’s momentum remains invariant during the collision, the kinetic energy is reduced.
In summary, when the bullet is embedded in the block, only momentum is conserved, while kinetic energy is lost in the process. This illustrates the fundamental differences between momentum and kinetic energy conservation in collision events.
Click here for more :
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-11/physics/chapter-5/
The time period of a satellite of earth is 5 hours. If the separation between the earth and the satellite is increased to 4 times the previous valiue, the new time period will. become
According to Kepler's law of periods, the square of the orbital period of a planet (T²) is directly proportional to the cube of the semi-major axis of its orbit (r³). This relationship can be expressed as the ratio of the periods and radii of two planets. For example, if one planet's radius is fourRead more
According to Kepler’s law of periods, the square of the orbital period of a planet (T²) is directly proportional to the cube of the semi-major axis of its orbit (r³). This relationship can be expressed as the ratio of the periods and radii of two planets. For example, if one planet’s radius is four times that of another, the ratio of their periods squared is equal to the ratio of their radii cubed. This leads to the conclusion that the period of the second planet is eight times longer than the first.
See lessThus, if the first period is 5 hours, the second period will be 40 hours.
According to Kepler’s law of periods,
T² ∝ r³
(T₂/T₁)² = (r₂/r₁)³ = (4/1)³ = 64
T₂ = 8T₁ = 8 x 5 = 40 h.
In a representative democracy, which of the following best describes the role of elected representatives?
In a representative democracy, elected representatives play a crucial role as: (b) They are accountable to the public and make decisions on behalf of their constituents. Explanation: Elected representatives represent the interests of the people who voted for them. They make decisions, formulate poliRead more
In a representative democracy, elected representatives play a crucial role as:
(b) They are accountable to the public and make decisions on behalf of their constituents.
Explanation:
See lessElected representatives represent the interests of the people who voted for them. They make decisions, formulate policies, and pass laws that reflect the needs and preferences of their constituents. Their accountability to the public is essential, as they can be replaced in elections if the electorate is dissatisfied with their performance or decisions.
‘Consumer Affairs raids Malda markets to check malpractices; Complaints were received that soft drinks were being sold at a higher price…’
(i) The consumer right violated in the instance of selling soft drinks at a higher price is the 'Right to Fair and Transparent Trade Practices'. Charging an inflated price for soft drinks breaches this right, ensuring fair trade practices for consumers. (ii) The likely invoked consumer right in respRead more
(i) The consumer right violated in the instance of selling soft drinks at a higher price is the ‘Right to Fair and Transparent Trade Practices’. Charging an inflated price for soft drinks breaches this right, ensuring fair trade practices for consumers.
(ii) The likely invoked consumer right in response to the complaints is the ‘Right to Seek Redressal’. This empowers consumers to seek remedy against unfair trade practices. The complaint prompted authorities to take action, demonstrating the exercise of this consumer right.
See less