Related Questions

A body of mass ‘m’ moving with a constant velocity ‘v’ strikes another body of same mass moving with same velocity but in opposite direction. The common velocity of both the bodies after collision is
A v
B 2v
C 4v
D 8v
When two elastic bodies collide with each other,
A The two bodies will momentarily come to rest after collision
B The two bodies tend to compress and deform at the surface of contact
C The two bodies begin to regain their original shape
D All of the above
The phenomenon of collision of two elastic bodies takes place because bodies
A Immediately after collision come momentarily to rest
B Tend to compress each other till they are compressed maximum possible
C Attempt to regain its original shape due to their elasticities
D All the above
During elastic impact, the relative velocity of the two bodies after impact is __________ the relative velocity of the two bodies before impact.
A Equal to
B Equal and opposite to
C Less than
D Greater than
Three elastic constants for a completely anisotropic elastic material which follows the Hooke's law are young's modulus, elastic limit stress and yield stress. Which of the following properties is most sensitive to increase in strain rate ?
A Tensile strength
B Elastic limit
C Proportional limit
D Yield strength
All materials obey Hooke's law within elastic limit. When elastic limit is reached, the tensile strain
A Increases very quickly
B Decreases very quickly
C Increases in proportion to stress
D Decreases in proportion to stress
Stress may be expressed in Newtons
A Per millimetre square (N/mm2)
B Per centimetre square (N/cm2)
C Per metre square (N/m2)
D None of these
The initial tension (in newtons) in a bolt used for making a fluid tight joint like steam engine cover joints, is calculated by the relation (where d = Nominal diameter of bolt in mm)
A 1420 d
B 1680 d
C 2080 d
D 2840 d
A jet of water is striking at the centre of a curved vane moving with a uniform velocity in the direction of jet. For the maximum efficiency, the vane velocity is ________ of the jet velocity
A One-half
B One-third
C Two-third
D Three-fourth
Two balls of equal mass and of perfectly elastic material are lying on the floor. One of the balls with velocity ‘v’ is made to strike the second ball. Both the balls after impact will move with a velocity
A $${\text{v}}$$
B $$\frac{{\text{v}}}{2}$$
C $$\frac{{\text{v}}}{4}$$
D $$\frac{{\text{v}}}{8}$$

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