NEET UG PHYSICS MCQ: WORK-ENERGY-POWER

1 Medium

1 of 1

Application +4 | -1

Two springs A and B are identical but A is harder than

B({k_A} > {k_B})

. Let

{W_A}\,and\,{W_B}

represent the work done when the springs are stretched through the same distance and

{W'_A}\,and\,{W'_B}

are the work done when these are stretched by equal forces, then which of the following is true

View answer and explanation

Correct option: B

{W_A} > {W_B}\,and\,{W'_A}\, < \,{W'_B}

Option B is correct because with the same displacement, a stiffer spring (A) requires more work, and with the same force, a less stiff spring (B) stretches more, requiring more work.

More Questions from WORK-ENERGY-POWER

Practice All Chapter MCQs →

{A}

ball is dropped on the ground from a height of

2 {~m}

. If the coefficient of restitution is 0.6 , the height to which the ball will rebound is A running man has the same kinetic energy as that of a boy of half his mass. The man speed up by

2\mathrm{\;m}{\mathrm{s}^{ - 1}}

and the boy changes his speed by

x = \mathrm{m}{\mathrm{s}^{ - 1}}

, so that the kinetic energies of the boy and the man are again equal. Then x in

\mathrm{m}{\mathrm{s}^{ - 1}}

is A force

\mathrm{\vec F} = - K\left( {y\hat i + x\hat j} \right)

(where K is a positive constant) acts on a particle moving in the x-y plane. Starting from the origin, the particle is taken along the positive x-axis to the point (a,0) and then parallel to the y-axis to the (a,a). The total work done by the force

\mathrm{\vec F}

on the particle is A motor is used to deliver water at a certain rate from a given pipe. To obtain 3 times water from same pipe in same time, by what factor should power of the motor be increased. A body projected vertically from the earth reaches a height equal to earth’s radius before returning to the earth. The power exerted by the gravitational force is greatest The speed limit of a car over a roadways bridge in the form of a vertical arc is

9.8\;\mathrm{m}{\mathrm{s}^{ - 1}}

. The diameter of the are is