piku

Poll

gagan23

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

A child is sitting on a swing. Its minimum and maximum heights from the ground 0.75 m and 2 m respectively, its maximum speed will be

Speed is a scalar quantity that measures how quickly an object moves. It is defined as the distance traveled per unit of time. Speed can be constant or variable, depending on the motion of the object. Common units of speed ...

Poll

gagan23

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

A bullet of mass 10 g leaves a rifle at an initial velocity of 100 m/s and strikes the earth at the same level with a velocity of 500 m/s. The work done in joule overcoming the resistance of air will be

The joule is the SI unit of energy, work, and heat. It is defined as the amount of energy transferred when a force of one newton acts through a distance of one meter. The joule is also used to measure ...

Poll

gagan23

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

If kinetic energy of a body is increased by 300% then percentage change in momentum will be

Momentum is the quantity of motion possessed by a moving body, determined by the product of its mass and velocity. It is a vector quantity with both magnitude and direction and is conserved in isolated systems during collisions or interactions, ...

Poll

gagan23

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

Two bodies of masses m and 4m. are moving with equal kinetic energies. The ratio of their linear momenta is

Linear momentum is the product of a body’s mass and velocity, representing the quantity of motion. It is a vector quantity, having both magnitude and direction. Momentum is conserved in isolated systems, making it crucial in understanding collisions and dynamics. ...

annu10

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

What is meant by positive work, negative work and zero works? Give examples of each type.

Work is the energy transferred to or from an object via the application of force along a displacement, measured in joules. Class 11 Physics Work, Energy and Power CBSE EXAM 2024-25

gagan23

Asked: January 4, 2025In: Class-11-Physics

Show that in the absence of any external force, the velocity of the centre of mass remains constant.

An external force acts on a system from its surroundings, influencing its motion or equilibrium, such as gravity or friction. Class 11 Physics Systems of Particle & Rotational Motion CBSE EXAM 2024-25

gagan23

Asked: January 4, 2025In: Class-11-Physics

Write an expression for the position vector of the centre of mass of n-particle system. Also write the equations of motion which govern the motion of the centre of mass.

A position vector represents an object’s location relative to a reference point, expressed in terms of magnitude and direction in space. Class 11 Physics Systems of Particle & Rotational Motion CBSE EXAM 2024-25

Poll

lokesh12

Asked: December 25, 2024In: Class-11-Physics

For a satellite moving in an orbit around the earth, the ratio of kinetic energy to potential energy is

An orbit is the curved path of an object around a celestial body, influenced by gravitational forces and centripetal motion. Class 11 Physics Gravitation CBSE EXAM 2024-25

Poll

soma09

Asked: December 19, 2024In: Class-11-Physics

Satellite is revolving around earth. If its height is increased to four times the height of geostationary satellite, what will become its time period?

A geostationary satellite orbits Earth at the equator with a period of 24 hours, matching Earth’s rotation, appearing stationary. Class 11 Physics Gravitation CBSE EXAM 2024-25

Poll

soma09

Asked: December 19, 2024In: Class-11-Physics

If gravitational constant is decreasing in time, what will remain unchanged in case of a satellite orbiting around earth?

The gravitational constant, denoted as G, is a fundamental constant in physics that quantifies the strength of the gravitational force between two masses. Class 11 Physics Gravitation CBSE EXAM 2024-25

A child is sitting on a swing. Its minimum and maximum heights from the ground 0.75 m and 2 m respectively, its maximum speed will be

A bullet of mass 10 g leaves a rifle at an initial velocity of 100 m/s and strikes the earth at the same level with a velocity of 500 m/s. The work done in joule overcoming the resistance of air will be

If kinetic energy of a body is increased by 300% then percentage change in momentum will be

Two bodies of masses m and 4m. are moving with equal kinetic energies. The ratio of their linear momenta is

What is meant by positive work, negative work and zero works? Give examples of each type.

Show that in the absence of any external force, the velocity of the centre of mass remains constant.

Write an expression for the position vector of the centre of mass of n-particle system. Also write the equations of motion which govern the motion of the centre of mass.

For a satellite moving in an orbit around the earth, the ratio of kinetic energy to potential energy is

Satellite is revolving around earth. If its height is increased to four times the height of geostationary satellite, what will become its time period?

If gravitational constant is decreasing in time, what will remain unchanged in case of a satellite orbiting around earth?

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