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A uniform rod of mass m is bent into the form of a semicircle of radius R. The moment of inertia of the rod about an axis passing through A and perpendicular to the plane of the paper is
The correct answer is:
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An inverted “V” is made up of two uniform boards each weighing 200 N. Each side has the same length and makes an angle 30° with the vertical as shown in figure. The magnitude of the static frictional force that acts on each of the lower end of the V is
An inverted “V” is made up of two uniform boards each weighing 200 N. Each side has the same length and makes an angle 30° with the vertical as shown in figure. The magnitude of the static frictional force that acts on each of the lower end of the V is
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A uniform ladder of length 5m is placed against the wall as shown in the figure. If is the same for both the walls, what is the minimum value of mc officient of friction for it not to slip
A uniform ladder of length 5m is placed against the wall as shown in the figure. If is the same for both the walls, what is the minimum value of mc officient of friction for it not to slip
physics-General
physics-
A thin rod of length L and mass M is bend at the middle point O as shown in figure. Consider an axis passing through two middle point O and perpendicular to the plane of the bent rod. Then moment of inertia about this axis is :
A thin rod of length L and mass M is bend at the middle point O as shown in figure. Consider an axis passing through two middle point O and perpendicular to the plane of the bent rod. Then moment of inertia about this axis is :
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Two persons of equal height are carrying a long uniform wooden beam of length l. They are at distance l/4 and l/6 from nearest end of the rod. The ratio of normal reaction at their heads is
Two persons of equal height are carrying a long uniform wooden beam of length l. They are at distance l/4 and l/6 from nearest end of the rod. The ratio of normal reaction at their heads is
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The figure shows a uniform rod lying along the x-axis. The locus of all the points lying on the xy-plane, about which the moment of inertia of the rod is same as that about O is
The figure shows a uniform rod lying along the x-axis. The locus of all the points lying on the xy-plane, about which the moment of inertia of the rod is same as that about O is
physics-General
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Two smooth balls A and B, each of mass m and radius R, have their centre at (0,0,R) and at (5R,–R,R) respectively, in a coordinate system as shown. Ball A, moving along positive x axis, collide with ball B. Just before the collision, speed of ball A is 4 m/s and ball B is stationary. The collision between the balls is elastic.
Velocity of the ball A just after the collision is 3j) m/s
Two smooth balls A and B, each of mass m and radius R, have their centre at (0,0,R) and at (5R,–R,R) respectively, in a coordinate system as shown. Ball A, moving along positive x axis, collide with ball B. Just before the collision, speed of ball A is 4 m/s and ball B is stationary. The collision between the balls is elastic.
Velocity of the ball A just after the collision is 3j) m/s
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A carpet of mass 'M' made of inextensible material is rolled along its length in the form of a cylinder of radius 'R' and is kept on a rough floor. The carpet starts unrolling without sliding on the floor when a negligibly small push is given to it. The horizontal velocity of the axis of the cylindrical part of the carpet when its radius reduce to R/2 will be:
A carpet of mass 'M' made of inextensible material is rolled along its length in the form of a cylinder of radius 'R' and is kept on a rough floor. The carpet starts unrolling without sliding on the floor when a negligibly small push is given to it. The horizontal velocity of the axis of the cylindrical part of the carpet when its radius reduce to R/2 will be:
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A composite bar of length 
is made up from a rod of material 1 and of length L1 attached to a rod of material 2 and of length L2 as shown. If 
and 
are their respective coefficients of linear expansion, then equivalent coefficient of linear expansion for the composite rod is:
A composite bar of length is made up from a rod of material 1 and of length L1 attached to a rod of material 2 and of length L2 as shown. If and are their respective coefficients of linear expansion, then equivalent coefficient of linear expansion for the composite rod is:
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The observer 'O' se the distance AB as infinitely large. If refractive index of liquid is and that of glass 
is:
The observer 'O' se the distance AB as infinitely large. If refractive index of liquid is and that of glass is:
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Figure shows two conducting thin concentric shells of radii r and 3r. The outer shell carri charge q and inner shell is neutral. The amount of charge which flows from inner shell to the earth after the key K is closed, is equal to:
Figure shows two conducting thin concentric shells of radii r and 3r. The outer shell carri charge q and inner shell is neutral. The amount of charge which flows from inner shell to the earth after the key K is closed, is equal to:
physics-General
physics-
Two conducting large plat 
& 
are placed parallel to each other at very small separation 'd'. The plate area of either face of plate is A. A charge +2Q is given to plate & –Q to the plate (neglect ends effects). If plate & are now connected by conducting wire, then total amount of heat produced is
Two conducting large plat & are placed parallel to each other at very small separation 'd'. The plate area of either face of plate is A. A charge +2Q is given to plate & –Q to the plate (neglect ends effects). If plate & are now connected by conducting wire, then total amount of heat produced is
physics-General
physics-
An object is placed infront of a converging lens at a distance equal to twice the focal length 
of the lens. On the other side of the lens is a concave mirror of focal length 
separated from the lens by a distance 
. Light from the object pass rightward through the lens, reflects from the mirror, pass leftward through the lens and forms a final image of the object.
An object is placed infront of a converging lens at a distance equal to twice the focal length of the lens. On the other side of the lens is a concave mirror of focal length separated from the lens by a distance . Light from the object pass rightward through the lens, reflects from the mirror, pass leftward through the lens and forms a final image of the object.
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physics-
Two particle of charge q1 and q2 are separated by distance d as shown in figure. Charge q1 is situated at the origin. The net electric field due to the particle is zero at x = d/4. With V = 0 at infinity, the location of a point in terms of d on the x axis (other than at infinity) at which the electrical potential due to the two particle is zero, is given by:
Two particle of charge q1 and q2 are separated by distance d as shown in figure. Charge q1 is situated at the origin. The net electric field due to the particle is zero at x = d/4. With V = 0 at infinity, the location of a point in terms of d on the x axis (other than at infinity) at which the electrical potential due to the two particle is zero, is given by:
physics-General
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1mC. charge is uniformly distributed on a spherical shell given by equation 
What will be intensity of electric field at a point (1, 1, 2)?
1mC. charge is uniformly distributed on a spherical shell given by equation What will be intensity of electric field at a point (1, 1, 2)?
physics-General
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An electron is placed just in the middle between two long fixed line charge of charge density + The wire are in the xy plane (Do not consider gravity)
An electron is placed just in the middle between two long fixed line charge of charge density + The wire are in the xy plane (Do not consider gravity)
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