Home
Class 11
PHYSICS
A horizontal uniform beam AB of length 4...

A horizontal uniform beam AB of length 4m and a mass of 20 kg is supported at the end B by means of a string which passes over a fixed, smooth pulley supporting a counterbalancing weight of 8 kg on the other side. What force, F when applied at the point A in a suitable direction, will hold the beam in static equilibrium ?

A

`F = 160 N`

B

`f = 40 sqrt19` N

C

`F=(200 - 80sqrt3)N`

D

no force F, as specified, can hold the beam in static equilibrium

Text Solution

Verified by Experts

The correct Answer is:
B
Promotional Banner

Similar Questions

Explore conceptually related problems

A block of mass m is tied to one end of a spring which passes over a smooth fixed pulley A and under a light smooth movable pulley B . The other end of the string is attached to the lower end of a spring of spring constant K_2 . Find the period of small oscillation of mass m about its equilibrium position (in second). (Take m=pi^2kg , K_2k=4K_1 , K_1=17(N)/(m). )

A string of negligible mass passes over a pulley of mass m which is clamped. It supports a block of mass M at its lower free end. What is force exerted on pulley by the support ?

In the figure shown one end of a light spring of natural length l_(0)=sqrt(5/8)m(~~0.8m) is fixed at point D and other end is attached to the centre B of a uniform rod AF of length l_(0)//sqrt(3) and mass 10kg. The rod is free to rotate in a vertical plane about a fixed horizontal axis passing through the end A of the rod. The rod is held at rest in horizontal position and the spring is in relaxed state. It is found that, when the rod is released to move it makes an angle of 60^(@) with the horizontal when it comes to rest for the first time. Find the (a) the maximum elogation in the spring . (Approximately) (b) the spring constant. (Approximately)

Two blocks of mass 10kg and 2 kg respectively are connected by an ideal string passing over a fixed smooth pulley as shown in figure. A monkey of mass 8 kg started climbing the string with a constant acceleration of 2m//s^(2) with respect to string at t=0 . Initially the system is in equilibrium and monkey is at a distance 2.4 from the pulley. Find the time taken by monkey to reach the pulley in sec.

A uniform string of length 10m and mass 20 kg lies on a smooth frictionless inclined plane. A force of 200N is applied as shown in the figure. (a) Find the acceleration of the string. (b) Find the tension in the string at 2m from end A.

A mass m rests on a horizontal table. It is attached to a light inextensible string which passes over a smooth pulley and carries a mass m at the other end. If the mass m is raised vertically through a distance h and is then dropped, what is the speed with which the mass 2m begins to rise?

A long rubber tube having mass 0.9kg is fastened to a fixed support and the free end of the tube is attached to a cord which passase over a pulley and supports an object, with a mass of 5 kg as shown in fig. If the tube is struck by a transvers blow at one end, the time required for the pulse to reach the 49 other end is (linear density of tube = 49/625 kg //m )

A 4 kg block A is placed on the top of 8 kg block B which rests on a smooth table. A just slips on B when a force of 12 N is applied on A. Then the maximum horizontal force F applied on B to make both A and B move together, is

A mass of 3kg descending vertically downwards supports a mass of 2kg by means of a light string passing over a pulley At the end of 5s the string breaks How much high from now the 2kg mass will go (g = 9.8m//^(2)) .

A uniform rod AB, 4m long and weighing 12 kg, is supported at end A, with a 6 kg lead weight at B. The rod floats as shown in figure with one-half of its length submerged. The buoyant force on the lead mass is negligible as it is of negligible volume. Find the tension in the cord and the total volume of the rod