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From a solid sphere of mass M and radius R, a spherical portion of radius 2R is removed, as shown in the figure. Taking gravitational potential V=0 at r=∞ , the potential at the centre of the cavity thus formed is : (G= gravitational constant)
13
Sep
From a solid sphere of mass M and radius R, a spherical portion of radius 2R is removed, as shown in the figure. Taking gravitational potential V=0 at r=∞ , the potential at the centre of the cavity thus formed is : (G= gravitational constant) a spherical portion of radius 2R is removed as shown [...]
The work function of a certain metal is hC / λ0 . When a monochromatic light of wavelength λ<λ0 is incident such that the plate gains a total power P . If the efficiency of photoelectric emission is η% and all the emitted photoelectrons are captured by a hollow conducting sphere of radius R already charged to potential V , then neglecting any interaction of potential of the sphere at time t is:
13
Sep
The work function of a certain metal is hC / λ0 . When a monochromatic light of wavelength λ<λ0 is incident such that the plate gains a total power P . If the efficiency of photoelectric emission is η% and all the emitted photoelectrons are captured by a hollow conducting sphere of radius R already [...]
Four particles, each of mass M and equidistant from each other, move along a circle of radius R under the action of their mutual gravitational attraction. The speed of each particle is:
13
Sep
Four particles, each of mass M and equidistant from each other, move along a circle of radius R under the action of their mutual gravitational attraction. The speed of each particle is: each of mass M and equidistant from each other Four particles move along a circle of radius R under the action of their [...]
What is the minimum energy required to launch a satellite of mass m from the surface of a planet of mass M and radius R in a circular orbit at an altitude of 2R ?
13
Sep
What is the minimum energy required to launch a satellite of mass m from the surface of a planet of mass M and radius R in a circular orbit at an altitude of 2R ? What is the minimum energy required to launch a satellite of mass m from the surface of a planet of [...]
The mass of a spaceship is 1000 kg. It is to be launched from the earths surface out into free space. The value of g and R (radius of earth) are 10 m/s and 6400 km respectively. The required energy for this work will be :
13
Sep
The mass of a spaceship is 1000 kg. It is to be launched from the earths surface out into free space. The value of g and R (radius of earth) are 10 m/s and 6400 km respectively. The required energy for this work will be : A planet in a distant solar system is 10 [...]
The height at which the acceleration due to gravity becomes g/9 (where g = is the acceleration due to gravity on the surface of the earth) in terms of R, the radius of the earth, is
13
Sep
The height at which the acceleration due to gravity becomes g/9 (where g = is the acceleration due to gravity on the surface of the earth) in terms of R, the radius of the earth, is is The height at which the acceleration due to gravity becomes g/9 (where g = is the acceleration due [...]
A planet in a distant solar system is 10 times more massive than the earth and its radius is 10 times smaller. Given that the escape velocity from the earth is 11ms^−1, the escape velocity from the surface of the planet would be
13
Sep
A planet in a distant solar system is 10 times more massive than the earth and its radius is 10 times smaller. Given that the escape velocity from the earth is 11ms^−1, the escape velocity from the surface of the planet would be A planet in a distant solar system is 10 times more massive [...]
If gE and gM are the accelerations due to gravity on the surface of the earth and the moon respectively and if Millikan’s oil drop experiment could be performed on the two surfaces, one will find the ratio electronic charge on the earth electronic charge on the moon to be
13
Sep
If gE and gM are the accelerations due to gravity on the surface of the earth and the moon respectively and if Millikan’s oil drop experiment could be performed on the two surfaces, one will find the ratio electronic charge on the earth electronic charge on the moon to be If gE and gM are [...]
A particle of mass 10g is kept on the surface of a uniform sphere of mass 100kg and radius 10cm. Find the work done against the gravitational force between them to take the particle far away from the sphere.
13
Sep
A particle of mass 10g is kept on the surface of a uniform sphere of mass 100kg and radius 10cm. Find the work done against the gravitational force between them to take the particle far away from the sphere. A satellite of mass m revolves around the earth of radius R at a height x [...]
Light from a hydrogen tube is incident on the cathode of a photoelectric cell the work function of the cathode surface is 4.2eV . In order to reduce the photo – current to zero the voltage of the anode relative to the cathode must be made
13
Sep
Light from a hydrogen tube is incident on the cathode of a photoelectric cell the work function of the cathode surface is 4.2eV . In order to reduce the photo – current to zero the voltage of the anode relative to the cathode must be made potassium sodium and lithium. The plots are parallel. Correct [...]