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What is the maximum value of static friction between two surfaces called?
Limiting friction is the maximum force of static friction before an object starts moving. This question related to Chapter 4 physics Class 11th NCERT. From the Chapter 4 Laws of motion. Give answer according to your understanding. For more please visit here: https://www.tiwariacademy.com/ncert-solutRead more
Limiting friction is the maximum force of static friction before an object starts moving.
This question related to Chapter 4 physics Class 11th NCERT. From the Chapter 4 Laws of motion. Give answer according to your understanding.
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The reaction force of a book resting on a table is:
The normal force balances the book's weight and acts upwards perpendicular to the table. This question related to Chapter 4 physics Class 11th NCERT. From the Chapter 4 Laws of motion. Give answer according to your understanding. For more please visit here: https://www.tiwariacademy.com/ncert-solutiRead more
The normal force balances the book’s weight and acts upwards perpendicular to the table.
This question related to Chapter 4 physics Class 11th NCERT. From the Chapter 4 Laws of motion. Give answer according to your understanding.
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What is Einstein’s mass-energy equivalence? Mention some of its practical applications.
Einstein's mass-energy equivalence shows that mass and energy are inextricably linked and interchangeable. This means that a small quantity of mass can be converted into a huge amount of energy because the speed of light squared is very large. That was the revolutionary idea that transformed our perRead more
Einstein’s mass-energy equivalence shows that mass and energy are inextricably linked and interchangeable. This means that a small quantity of mass can be converted into a huge amount of energy because the speed of light squared is very large. That was the revolutionary idea that transformed our perception of physics, since it showed that mass could be interpreted as some sort of stored energy.
Practical applications of mass-energy equivalence include:
1. Nuclear Energy: A very small amount of mass gets converted to energy in nuclear reactions like fission and fusion. This powers nuclear reactors and accounts for the explosive energy released by atomic bombs.
2. Medical Applications: Many techniques, such as Positron Emission Tomography (PET) scans, depend on mass-energy equivalence. In a PET scan, positrons (the antimatter equivalent of electrons) annihilate with electrons to produce gamma rays that form images of metabolic activity in the body.
3. Particle Physics: In high-energy particle colliders, particles are accelerated to nearly the speed of light. When these particles collide, mass can be converted into energy, helping scientists discover new particles and understand fundamental forces.
4. Astrophysics: The principle can be applied to explain processes in stars, whereby nuclear fusion changes hydrogen into helium, releasing enormous energy that powers stars like the Sun.
Einstein’s mass-energy equivalence has had a tremendous impact across different fields, shaping energy production, medical imaging, and fundamental research in physics.
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Show analytically that gravitational force is a conservative force.
To prove that gravitational force is conservative, we would need to show that the work done by this force in moving any object between two points is path-independent. The work depends only on the initial and final positions of the object. Gravitational force is exerted on an object by the mass of thRead more
To prove that gravitational force is conservative, we would need to show that the work done by this force in moving any object between two points is path-independent. The work depends only on the initial and final positions of the object.
Gravitational force is exerted on an object by the mass of the Earth, pulling it toward the center. In the case of vertical motion, the work done by gravity can be understood in terms of a change in height. If an object moves from a higher to a lower position, gravity does positive work; from a low to a high position, the work done by gravity is negative, since gravity opposes the motion.
This work can be interpreted in terms of potential energy associated with the object’s height. As the object moves, its gravitational potential energy changes, reflecting the work done by gravity. The important point is that the work done depends only on the difference in heights between the starting and ending points, not on the path taken.
Since the work done by gravitational force is path-independent, and we can associate this work with a potential energy function, we conclude that gravitational force must be conservative. This has very important implications in many fields, from mechanics to energy conservation.
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If a machine is lubricated with oil
Lubrication is a key process in maintaining a machine that affects performance and smoothness. Once it is lubricated with oil, the machine minimizes friction between moving parts. Friction causes wearing and tearing on components that may slowly degrade, affecting the overall working of the machine.Read more
Lubrication is a key process in maintaining a machine that affects performance and smoothness. Once it is lubricated with oil, the machine minimizes friction between moving parts. Friction causes wearing and tearing on components that may slowly degrade, affecting the overall working of the machine. Applying a lubricant allows the surfaces of the machine to slide past one another more effortlessly, reducing resistance for smoother operations.
One of the main advantages of lubrication is the increase in mechanical efficiency. As friction decreases, less energy is wasted as heat, meaning that more of the input energy can be converted into useful work. This leads to a more efficient machine that can perform its tasks with less energy consumption. Although the mechanical efficiency improves due to reduced friction, the mechanical advantage remains unchanged. The ratio of the output force created by the machine to the input force applied on it is termed as mechanical advantage. This would indicate the magnitude to which a machine amplifies force, and lubrication doesn’t directly impact this property.
In short, proper lubrication improves a machine’s mechanical efficiency by reducing friction, hence causing it to work more smoothly while conserving energy.
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