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

A proton is kept at rest. A positively charged particle is released from rest at a distance d in its... read more
A proton is kept at rest. A positively charged particle is released from rest at a distance d in its field. Consider two experiments; one in which the charged particle is also a proton and in another, a positron. In the same time t, the work done on the two moving charged particles is
(a) same as the same force law is involved in the two experiments
(b) less for the case of a positron, as the positron moves away more rapidly and the force on it weakens
(c) more for the case of a positron, as the positron moves away a larger distance
(d) same as the work done by charged particle on the stationary proton read less

Answer

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

A man squatting on the ground gets straight up and stand. The force of reaction of ground on the man... read more
A man squatting on the ground gets straight up and stand. The force of reaction of ground on the man during the process is
(a) constant and equal to mg in magnitude
(b) constant and greater than mg in magnitude
(c) ‘ variable but always greater than mg
(d) at first greater than mg and later becomes equal to mg read less

Answer

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

In a shotput event an athlete throws the shotput of mass 10 kg with an initial speed of 1 m s-1 at 45°... read more
In a shotput event an athlete throws the shotput of mass 10 kg with an initial speed of 1 m s-1 at 45° from a height 1.5 m above ground. Assuming air resistance to be negligible and acceleration due to gravity to be 10 m s -2, the kinetic energy of the shotput when it just reaches the ground will be
(a) 2.5 J    
(b) 5.0 J                    
(c) 52.5 J                  
(d) 155.0 J read less

Answer

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

Which of the diagrams in figure correctly shows the change in kinetic energy of an iron sphere falling... read more
Which of the diagrams in figure correctly shows the change in kinetic energy of an iron sphere falling freely in a lake having sufficient depth to impart it a terminal velocity?

ncert-exemplar-problems-class-11-physics-chapter-5-work-energy-and-power-24 read less

Answer

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

A man of mass m, standing at the bottom of the staircase, of height L climbs it and stands at its top.... read more
A man of mass m, standing at the bottom of the staircase, of height L climbs it and stands at its top.
(a) Work done by all forces on man is equal to the rise in potential energy mgL.
(b) Work done by all forces on man is zero.
(c) Work done by the gravitational force on man is mgL.
(d) The reaction force from a step does not do work because the point of application of the force does not move while the force exists. read less

Answer

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

A bullet of mass m fired at 30° to the horizontal leaves the barrel of the gun with a velocity v.... read more
A bullet of mass m fired at 30° to the horizontal leaves the barrel of the gun with a velocity v. The bullet hits a soft target at a height h above the ground while it is moving downward and emerge out with half the kinetic energy it had before hitting the target.
Which of the following statements are correct in respect of bullet after it emerges out of the target?
(a) The velocity of the bullet will be reduced to half its initial value.
(b) The velocity of the bullet will be more than half of its earlier velocity
(c) The bullet will continue to move along the same parabolic path.
(d) The bullet will move in a different parabolic path.
(e) The bullet will fall vertically downward after hitting the target.
(f) The internal energy of the particles of the target will increase. read less

Answer

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

Calculate the power of a crane, in watts, which lifts a mass of 100 kg to a height of 10 m in 20 s.

Answer

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

The average work done by a human heart while it beats once is 0.5 J. Calculate the power used by heart... read more
The average work done by a human heart while it beats once is 0.5 J. Calculate the power used by heart if it beats 72 times in a minute. read less

Answer

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

Give example of a situation in which an applied force does not result in a change in kinetic energy. read more
Give example of a situation in which an applied force does not result in a change in kinetic energy. read less

Answer

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

Two bodies of unequal mass are moving in the same direction with equal kinetic energy. The two bodies... read more
Two bodies of unequal mass are moving in the same direction with equal kinetic energy. The two bodies are brought to rest by applying retarding force of same magnitude. How would the distance moved by them before coming to rest compare? read less

Answer

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