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Rishabh39

Asked: January 15, 2025In: Class-11-Physics

A ball moving with velocity 2 m/s collides head on with another stationary ball of double the mass. If the coefficient of restitution is 0.5, then their velocities (in m/s) after collision will be

A collision is an event where two or more bodies exert forces on each other for a short time. Collisions can be elastic where both momentum and kinetic energy are conserved or inelastic where momentum is conserved but kinetic energy ...

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Rishabh39

Asked: January 14, 2025In: Class-11-Physics

An engine pumps water through a hose pipe. Water passes through the pipe and leaves it with a velocity of 2 m/s. The mass per unit length of water in the pipe is 100 kg/m. What is the power of the engine?

Power is the rate at which work is done or energy is transferred over time. It is calculated using the formula Power = Work done / Time taken. The SI unit of power is the watt where one watt equals ...

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Rishabh39

Asked: January 14, 2025In: Class-11-Physics

A body projected vertically from the earth reaches a height equal to earth’s radius before returning to the earth. The power exerted by the gravitational force is greatest

Gravitational force is the attractive force between two masses due to their mass and distance. It is described by Newton’s law of universal gravitation which states that the force is directly proportional to the product of the masses and inversely ...

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Rishabh39

Asked: January 14, 2025In: Class-11-Physics

A small mass attached to string rotates on a frictionless table top as shown. If the tension in the string is increased by pulling the string causing the radius of the circular motion to decrease by a factor of 2, the kinetic energy of the mass will

Kinetic energy is the energy possessed by an object due to its motion. It is calculated using the formula KE = (1/2) mv² where m is the mass and v is the velocity. Kinetic energy increases with the square of ...

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Rishabh39

Asked: January 14, 2025In: Class-11-Physics

A body of mass 1 kg is thrown upwards with a velocity of 20 m/s. It momentarily comes to rest after attaining a height of 18 m. How much energy is lost due to air friction? [Take g = 10 m/s²]

Friction is a force that opposes the relative motion between two surfaces in contact. It arises due to microscopic irregularities and adhesive interactions. There are two main types of friction: static friction which prevents motion and kinetic friction which acts ...

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Rishabh39

Asked: January 14, 2025In: Class-11-Physics

The coefficient of restitution e for a perfectly elastic collision is

An elastic collision is a type of collision where both momentum and kinetic energy are conserved. During this interaction, objects may deform temporarily but return to their original shapes afterward. Examples include collisions between billiard balls or gas molecules, demonstrating ...

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Rishabh39

Asked: January 14, 2025In: Class-11-Physics

Two identical balls A and B collide head on elastically. If velocities of A and B, before the collision are +0.5 m/s and -0.3 m/s respectively, then their velocities, after the collision, are respectively

An elastic collision is one in which both momentum and kinetic energy are conserved. During the collision, the objects may deform momentarily but return to their original shapes without loss of energy. Examples include collisions between billiard balls or gas ...

Rishabh39

Asked: January 6, 2025In: Class-11-Physics

Write an expression for torque in three-dimensional motion. Hence write the expressions for the rectangular components of torque.

Three-dimensional motion involves movement in three spatial dimensions, characterized by changes in position along the x, y, and z axes simultaneously. Class 11 Physics Systems of Particle & Rotational Motion CBSE EXAM 2024-25

Rishabh39

Asked: January 6, 2025In: Class-11-Physics

Show that the magnitude of torque = magnitude of force x moment arm. Also show that only the angular component of the force is responsible for producing torque.

Magnitude refers to the size or amount of a quantity, regardless of its direction, often used to describe scalar and vector quantities. Class 11 Physics Systems of Particle & Rotational Motion CBSE EXAM 2024-25

Rishabh39

Asked: January 6, 2025In: Class-11-Physics

Explain how torque can be expressed as a vector product of two vectors. How is the direction of torque determined?

Vectors are quantities that have both magnitude and direction, used to represent physical quantities like velocity, force, and displacement. Class 11 Physics Systems of Particle & Rotational Motion CBSE EXAM 2024-25

Rishabh39

A ball moving with velocity 2 m/s collides head on with another stationary ball of double the mass. If the coefficient of restitution is 0.5, then their velocities (in m/s) after collision will be

An engine pumps water through a hose pipe. Water passes through the pipe and leaves it with a velocity of 2 m/s. The mass per unit length of water in the pipe is 100 kg/m. What is the power of the engine?

A body projected vertically from the earth reaches a height equal to earth’s radius before returning to the earth. The power exerted by the gravitational force is greatest

A small mass attached to string rotates on a frictionless table top as shown. If the tension in the string is increased by pulling the string causing the radius of the circular motion to decrease by a factor of 2, the kinetic energy of the mass will

A body of mass 1 kg is thrown upwards with a velocity of 20 m/s. It momentarily comes to rest after attaining a height of 18 m. How much energy is lost due to air friction? [Take g = 10 m/s²]

The coefficient of restitution e for a perfectly elastic collision is

Two identical balls A and B collide head on elastically. If velocities of A and B, before the collision are +0.5 m/s and -0.3 m/s respectively, then their velocities, after the collision, are respectively

Write an expression for torque in three-dimensional motion. Hence write the expressions for the rectangular components of torque.

Show that the magnitude of torque = magnitude of force x moment arm. Also show that only the angular component of the force is responsible for producing torque.

Explain how torque can be expressed as a vector product of two vectors. How is the direction of torque determined?

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