Physics-
General
Easy
Question
A ball of mass m is attached to a rigid vertical rod by means of two massless strings with length L. The strings are attached to the rod at points a distance L apart (see Figure). The system is rotating about the axis of the rod, both strings being taut and forming an equilateral triangle. The tension in the upper string is 
- Draw a diagram showing all forces acting on the ball.
- What is the tension in the lower string?
- What is the net force on the ball at the instant shown in Figure?
- What is the speed of the ball? Express all your answers in terms of L, m and
The correct answer is: Draw a diagram showing all forces acting on the ball.
Related Questions to study
physics-
The diagram represents a ramp at a skateboard park : a quarter-circle arc of radius R (segment AB) joined to a horizontal section (segment BC). A skateboarder of mass M starts from rest at point A, rolls frictionlessly down arc AB, and collides with his friend (also same mass M) who is standing on the ground at rest at point B. The two people stick together in the collision. They fall over and together slide distance d along the horizontal surface before coming to a stop. The coefficient of kinetic friction along the horizontal segment is 
The diagram represents a ramp at a skateboard park : a quarter-circle arc of radius R (segment AB) joined to a horizontal section (segment BC). A skateboarder of mass M starts from rest at point A, rolls frictionlessly down arc AB, and collides with his friend (also same mass M) who is standing on the ground at rest at point B. The two people stick together in the collision. They fall over and together slide distance d along the horizontal surface before coming to a stop. The coefficient of kinetic friction along the horizontal segment is
physics-General
physics-
A ray of light incident normally on the horizontal face of the slab and just fail to emerge from the diagonal face of the prism. If prism angle 30° refractive index of the prism is
A ray of light incident normally on the horizontal face of the slab and just fail to emerge from the diagonal face of the prism. If prism angle 30° refractive index of the prism is
physics-General
physics-
An object 'O' is kept in air in front of a thin plano convex lens of radius of curvature 10 cm. It's refractive index is 3/2 and the medium towards right of plane surface is water of refractive index 4/3. What should be the distance 'x' of the object so that the rays become parallel finally.
An object 'O' is kept in air in front of a thin plano convex lens of radius of curvature 10 cm. It's refractive index is 3/2 and the medium towards right of plane surface is water of refractive index 4/3. What should be the distance 'x' of the object so that the rays become parallel finally.
physics-General
physics-
In the figure shown, if 
is equal to
In the figure shown, if is equal to
physics-General
physics-
An equiconcave diverging lens of focal length F is cut into two equal halves. The two halves are turned around and joined with some liquid between them. The lens obtained is converging with focal length F. If the refractive index of the liquid is 3 then what is the refractive index of the lens?
An equiconcave diverging lens of focal length F is cut into two equal halves. The two halves are turned around and joined with some liquid between them. The lens obtained is converging with focal length F. If the refractive index of the liquid is 3 then what is the refractive index of the lens?
physics-General
physics-
Two blocks on an inclined slope (angle q) are connected by a rope as shown in the figure. The friction coefficient between the blocks and the slope is m. Someone is pulling a second rope at A so that the two blocks move upwards along the slope with constant speed. Ignore the mass of the ropes.
Two blocks on an inclined slope (angle q) are connected by a rope as shown in the figure. The friction coefficient between the blocks and the slope is m. Someone is pulling a second rope at A so that the two blocks move upwards along the slope with constant speed. Ignore the mass of the ropes.
physics-General
physics-
An equiconcave lens has focal length 10 cm in air. The refractive index of the material of the lens is 1.5. What should be the refractive index of the medium on the other side of the lens so that the image of a real object placed at a distance 10 cm from the lens is formed at infinity?
An equiconcave lens has focal length 10 cm in air. The refractive index of the material of the lens is 1.5. What should be the refractive index of the medium on the other side of the lens so that the image of a real object placed at a distance 10 cm from the lens is formed at infinity?
physics-General
physics-
Focal length of a thin convex lens is 30 cm. At a distance of 10 cm from the lens. There is a plane refracting surface beyond which the refractive index is 3/2. Where will the parallel rays incident on lens converge
Focal length of a thin convex lens is 30 cm. At a distance of 10 cm from the lens. There is a plane refracting surface beyond which the refractive index is 3/2. Where will the parallel rays incident on lens converge
physics-General
physics-
Figure shows the orbit of a planet P round the sun S. AB and CD are the minor and major axes of the ellipse. If U is the potential energy and K kinetic energy then 
at
Figure shows the orbit of a planet P round the sun S. AB and CD are the minor and major axes of the ellipse. If U is the potential energy and K kinetic energy then at
physics-General
physics-
Figure shows the orbit of a planet P round the sun S. AB and CD are the minor and major axes of the ellipse. If t1 is the time taken by the planet to travel along ACB and t2 the time along BDA, then
Figure shows the orbit of a planet P round the sun S. AB and CD are the minor and major axes of the ellipse. If t1 is the time taken by the planet to travel along ACB and t2 the time along BDA, then
physics-General
physics-
Consider two configurations of a system of three particles of masses m, 2m and 3m. The work done by external agent in changing the configuration of the system from figure (i) to figure (ii) is
Consider two configurations of a system of three particles of masses m, 2m and 3m. The work done by external agent in changing the configuration of the system from figure (i) to figure (ii) is
physics-General
physics-
The magnitude of the potential energy per unit mass of the object at the surface of earth is E. Then the escape velocity of the object is
The magnitude of the potential energy per unit mass of the object at the surface of earth is E. Then the escape velocity of the object is
physics-General
physics-
A small ball of mass ‘m’ is released at a height ‘R’ above the earth surface, as shown in the figure above. If the maximum depth of the ball to which it goes is R/2 inside the earth through a narrow grove before coming to rest momentarily. The grove, contain an ideal spring of spring constant K and natural length R, find the value of K if R is radius of earth and M mass of earth
A small ball of mass ‘m’ is released at a height ‘R’ above the earth surface, as shown in the figure above. If the maximum depth of the ball to which it goes is R/2 inside the earth through a narrow grove before coming to rest momentarily. The grove, contain an ideal spring of spring constant K and natural length R, find the value of K if R is radius of earth and M mass of earth
physics-General
physics-
The escape velocity for a planet is ve A tunnel is dug along a diameter of the planet and a small body is dropped into it at the surface. When the body reaches the centre of the planet, its speed will be
The escape velocity for a planet is ve A tunnel is dug along a diameter of the planet and a small body is dropped into it at the surface. When the body reaches the centre of the planet, its speed will be
physics-General
physics-
The figure shows the variation of energy with the orbit radius of a body in circular planetary motion. Find the correct statement about the curves A, B and C
The figure shows the variation of energy with the orbit radius of a body in circular planetary motion. Find the correct statement about the curves A, B and C
physics-General
