Home
Class 11
PHYSICS
A body of mass M is attached to the lowe...

A body of mass `M` is attached to the lower end of a metal wire, whose upper end is fixed . The elongation of the wire is `l`.

A

Loss in gravitinal potential energy of `M` is `Mgl`

B

Elastic potential energy stored in the wire is `(Mgl)/(2)`

C

Elastic potential energy stored in the wire is `Mgl`

D

Elastic potential energy stored in the wire is `Mgl//3`

Text Solution

Verified by Experts

The correct Answer is:
A, B
The wire experinces offers an average resisting force of `(0 + mg)/(2) = (mg)/(2)`
The remaining `(mgl)/(2)` energy is lost because of internal resistance with in the wire.
Promotional Banner

Topper's Solved these Questions

  • MECHANICAL PROPERTIES OF SOLIDS

    NARAYNA|Exercise COMPREHENSION TYPE|11 Videos

  • MECHANICAL PROPERTIES OF SOLIDS

    NARAYNA|Exercise SINGLE ANSWER TYPE QUESTIONS|13 Videos

  • MECHANICAL PROPERTIES OF SOLIDS

    NARAYNA|Exercise SINGLE ANSWER TYPE|15 Videos

  • MECHANICAL PROPERTIES OF FLUIDS

    NARAYNA|Exercise EXERCISE - III|30 Videos

  • MOTION IN A PLANE

    NARAYNA|Exercise Level-II(H.W)|31 Videos

Similar Questions

Explore conceptually related problems

A body of mass M is attached to lower end of a metal wire whose upper and is fixed. The elongation is l. The ratio of loss of gravitational potential energy to the energy stored in the wire is

A body of mass m is attached to the lower end of a spring whose upper end is fixed. The spring has negligible mass. When the mass m is slightly pulled down and released, it oscillates with a time period of 3s. When the mass m is increased by 1 kg , the time period of oscillations becomes 5s. The value of m in kg is

A ball of mass m is attached to the lower end of a vertical string whose upper end is fixed. An identcial ball 'B' moving with a velocity v_(0) = 6 m//s at an angle theta = 45^(@) from vertical collides elastically with the ball 'A' as shown. The verocity of the ball 'B' just after collision is

A metal wire of length L is suspended vertically from a rigid support. When a bob of mass M is attached to the lower end of wire, the elongation of the wire is l:

A block of mass M is attached to the lower end of a vertical rope of mass m. An upward force P acts on the upper end of the rope. The system is free to move. The force exerted by the rope on the block is (PM)/(M+m)

A metal wire of length L_1 and area of cross-section A is attached to a rigid support. Another metal wire of length L_2 and of the same cross-sectional area is attached to free end of the first wire. A body of mass M is then suspended from the free end of the second wire. If Y_1 and Y_2 are the Young's moduli of the wires respectively, the effective force constant of the system of two wire is

By how much will a 3.0 m long copper wire elongate if a weight of 10 kg is suspended from the lower end with the upper end keeping fixed? The diameter of the wire is 0.4 mm. Given: Y for copper =10^(11)Nm^(-2) and g=9.8ms^(-2)

A metal wire of length L_1 and area of cross section A is ttached to a rigid support. Another metal wire of length L_2 and of the same cross sectional area is attached to the free end of the first wire. A body of mass M is then suspended from the free end of the second wire, if Y_1 and Y_2 are the Young's moduli of the wires respectively the effective force constant of the system of two wires is

A metal wire of negligible mass, length 1 m and cross-sectional area 10^(-6) m^(2) is kept on a smooth horizontal table with one end fixed on the table. A ball of mass 2kg is attached to the other end of the wire. When the wire and the ball are rotated with angular velocity of 20 rad/s, it is found that the wire is elongated by 10^(-3)m . If the Young's modulus of the metal is n xx 10^(11) N//m^(2) , then the value of n is