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Asked on 13 Oct IIT JEE/IIT - JEE Mains/Mathematics/Statistics and Probability

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Asked on 25 Sep IIT JEE/IIT - JEE Mains/Physics/Laws of Motion

An electron and a proton are moving under the influence of mutual forces. In calculating the change in... read more

An electron and a proton are moving under the influence of mutual forces. In calculating the change in the kinetic energy of the system during motion, one ignores the magnetic force of one on another. This is, because
(a) the two magnetic forces are equal and opposite, so they produce no net ‘ effect
(b) the magnetic forces do not work on each particle
(c) the magnetic forces do equal and opposite (but non-zero) work on each particle
(d) the magnetic forces are necessarily negligible read less

Answer

Asked on 25 Sep IIT JEE/IIT - JEE Mains/Physics/Laws of Motion

Which of the diagrams shown in figure most closely shows the variation in kinetic energy of the earth... read more

Which of the diagrams shown in figure most closely shows the variation in kinetic energy of the earth as it moves once around the sun in its elliptical orbit?

ncert-exemplar-problems-class-11-physics-chapter-5-work-energy-and-power-19 read less

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Asked on 25 Sep IIT JEE/IIT - JEE Mains/Physics/Laws of Motion

Which of the diagrams in figure represents varation of total mechanical energy of a pendulum oscillating... read more
Which of the diagrams in figure represents varation of total mechanical energy of a pendulum oscillating in air as functon of time?
ncert-exemplar-problems-class-11-physics-chapter-5-work-energy-and-power-20 read less

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Asked on 25 Sep IIT JEE/IIT - JEE Mains/Physics/Laws of Motion

A raindrop falling from a height h above ground, attains a near terminal velocity when it has fallen... read more
A raindrop falling from a height h above ground, attains a near terminal velocity when it has fallen through a height (3/4)h. Which of the diagrams shown in figure correctly shows the change in kinetic and potential energy of the drop during its fall up to the ground?
ncert-exemplar-problems-class-11-physics-chapter-5-work-energy-and-power-22
read less

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Asked on 25 Sep IIT JEE/IIT - JEE Mains/Physics/Laws of Motion

A body is being raised to a height h from the surface of earth. What is the sign of work done by (a)... read more
A body is being raised to a height h from the surface of earth. What is the sign of work done by
(a) applied force and  (b) gravitational force? read less

Answer

Asked on 25 Sep IIT JEE/IIT - JEE Mains/Physics/Laws of Motion

Calculate the work done by a car against gravity in moving along a straight horizontal road. The mass... read more
Calculate the work done by a car against gravity in moving along a straight horizontal road. The mass of the car is 400 kg and the distance moved is 2 m. read less

Answer

Asked on 25 Sep IIT JEE/IIT - JEE Mains/Physics/Laws of Motion

A metre scale is moving with uiiiform velocity. This implies (a) the force acting on the scale is zero,... read more
A metre scale is moving with uiiiform velocity. This implies
(a) the force acting on the scale is zero, but a torque about the centre of mass can act on the scale.
(b) the force acting on the scale is zero and the torque acting about centre of mass of the scale is also zero.
(c) the total force acting on it need not be zero but the torque on it is zero.
(d) neither the force nor the torque need to be zero. read less

Answer

Asked on 25 Sep IIT JEE/IIT - JEE Mains/Physics/Laws of Motion

A hockey player is moving northward and suddenly turns westward with the same speed to avoid an opponent.... read more
A hockey player is moving northward and suddenly turns westward with the same speed to avoid an opponent. The force that acts on the player is
(a) frictional force along westward (b) muscle force along southward (c) frictional force along south-west (d) muscle force along south-west read less

Answer

Asked on 25 Sep IIT JEE/IIT - JEE Mains/Physics/Laws of Motion

The motion of a particle of mass m is given by x – 0 for t < 0 s, x(t) = A sin 4πt for... read more

The motion of a particle of mass m is given by x – 0 for t < 0 s, x(t) = A sin 4πt for 0 < t< (1/4) s (A > 0),
and x = 0 for / > (1/4) s.

Which of the following statements is true?

  • The force at t = (1/8) s on the particle is -16π2A-m.
  • The particle is acted upon by an impulse of magnitude 4/rA-m at t = 0 s and t = (1/4) s.
  • The particle is not acted upon by any force.
  • The particle is not acted upon by a constant force.
  • There is no impulse acting on the particle. read less

Answer

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