Physics
Mechanics
Easy
Question
Gravitational force is a conservative and medium independent force. Its nature is attractive. Gravitational field intensity and gravitational potential gives information about gravitational field in vector and scalar form respectively. Actually gravitational field intensity is equal to the negative of the potential gradient. Potential energy is defined for only conservative force. It is also equal the total energy in escaping condition. Gravitational potential is either negative or zero but can never be positive due to attractive nature of gravitational force, if potential at infinity is taken zero.
A person brings a mass of 1 kg from infinity to a point A. Initially the mass was at rest but it moves with a speed of 2 m/s as it reaches A. The work done by the person on the mass is -3J. The potential of A is
- -3 J / kg
- -2 J / kg
- -5 J / kg
- -7 J / kg
The correct answer is: -5 J / kg
Related Questions to study
Physics
The minimum and maximum distances of a satellite from the centre of the earth are 2R and 4R, respectively, where R is the radius of the earth and Mis the mass of the earth.
The radius of curvature at the point of minimum distance is
The minimum and maximum distances of a satellite from the centre of the earth are 2R and 4R, respectively, where R is the radius of the earth and Mis the mass of the earth.
The radius of curvature at the point of minimum distance is
PhysicsMechanics
Physics
Paragraph
The minimum and maximum distances of a satellite from the centre of the earth are 2R and 4R, respectively, where R is the radius of the earth and Mis the mass of the earth.
The minimum and maximum speeds are
Paragraph
The minimum and maximum distances of a satellite from the centre of the earth are 2R and 4R, respectively, where R is the radius of the earth and Mis the mass of the earth.
The minimum and maximum speeds are
PhysicsMechanics
Physics
A string is holding a solid block below the surface of the liquid as shown in figure. Now if the system is given an upward constant acceleration a, then as compared to previous state.
A string is holding a solid block below the surface of the liquid as shown in figure. Now if the system is given an upward constant acceleration a, then as compared to previous state.
PhysicsMechanics
Physics
A double star is a system of two stars of masses m and 2 m. rotating about their centre of mass only under their mutual gravitational attraction. If r is the separation between these two stars then their time period of rotation about their centre of mass will be proportional to
A double star is a system of two stars of masses m and 2 m. rotating about their centre of mass only under their mutual gravitational attraction. If r is the separation between these two stars then their time period of rotation about their centre of mass will be proportional to
PhysicsMechanics
Physics
If both the mass and radius of the earth decrease by 1%, the value of
If both the mass and radius of the earth decrease by 1%, the value of
PhysicsMechanics
Physics
A small mass m is moved slowly from the surface of the earth to a height h above the surface. The work done (by an external agent) in doing this is
A small mass m is moved slowly from the surface of the earth to a height h above the surface. The work done (by an external agent) in doing this is
PhysicsMechanics
Physics
A particle of mass m is thrown in a parabolic path towards earth having mass M and radius R. It comes to a greatest approach distance R/2 from surface of earth. Magnitude of total energy change required to make the particle moving in an elliptical path having eccentricity ½ with the greatest approach point either aphelion or perihelion are
A particle of mass m is thrown in a parabolic path towards earth having mass M and radius R. It comes to a greatest approach distance R/2 from surface of earth. Magnitude of total energy change required to make the particle moving in an elliptical path having eccentricity ½ with the greatest approach point either aphelion or perihelion are
PhysicsMechanics
Physics
If a body is projected with a speed lesser than escape velocity, then
If a body is projected with a speed lesser than escape velocity, then
PhysicsMechanics
Physics
Figure shows the kinetic energy (Ek) and potential energy (Ep) curves for a two-particle system. Name the point at which the system is a bound system.
Figure shows the kinetic energy (Ek) and potential energy (Ep) curves for a two-particle system. Name the point at which the system is a bound system.
PhysicsMechanics
Physics
An artificial satellite moving in a circular orbit around the earth has a total energy E0 . Its potential energy is
An artificial satellite moving in a circular orbit around the earth has a total energy E0 . Its potential energy is
PhysicsMechanics
Physics
Two stars each of mass M and radius R are approaching each other for a head-on collision. They start approaching each other when their separation is r>>R. If their speeds at this separation are negligible, the speed v with which they collide would be
Two stars each of mass M and radius R are approaching each other for a head-on collision. They start approaching each other when their separation is r>>R. If their speeds at this separation are negligible, the speed v with which they collide would be
PhysicsMechanics
Physics
PhysicsMechanics
Physics
The orbital velocity of a satellite at a height R above the surface of Earth is v. The escape velocity from the location is
The orbital velocity of a satellite at a height R above the surface of Earth is v. The escape velocity from the location is
PhysicsMechanics
Physics
The orbital velocity of an artificial satellite in a circular orbit just above the earth's surface is v. For a satellite orbiting at an altitude of half of the earth's radius, the orbital velocity is
The orbital velocity of an artificial satellite in a circular orbit just above the earth's surface is v. For a satellite orbiting at an altitude of half of the earth's radius, the orbital velocity is
PhysicsMechanics
Physics
PhysicsMechanics
