Which of the diagrams shown in the figure represents the variation of to mechanical energy of a pendulum oscillating in the air as a function of time.
 

1. 2.
3. 4.
Subtopic:  Work Energy Theorem |
From NCERT
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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 the figure correctly shows the change in kinetic and potential energy of the drop during its fall up to the ground?
1. 2.
3. 4.  
Subtopic:  Work Energy Theorem |
 58%
From NCERT
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In a shotput event, an athlete throws the shotput of mass \(10\) kg with an initial speed of \(1\) m/s at \(45^\circ\) from a height \(1.5\) m above ground. Assuming air resistance to be negligible and acceleration due to gravity to be \(10\) m/s2, the kinetic energy of the shotput when it just reaches the ground will be:
1. \(2.5\) J
2. \(5.0\) J
3. \(52.5\) J
4. \(155.0\) J

Subtopic:  Work Energy Theorem |
 60%
From NCERT
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Which of the diagrams in the figure correctly shows the change in kinetic energy of an iron sphere falling freely in a lake with sufficient density to impart it a terminal velocity?

1.   2.
3. 4.
Subtopic:  Concept of Work | Work Energy Theorem |
 71%
From NCERT
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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 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 the application of the force does not move while the force exists.

Choose the correct option:
1. (a, d)
2. (a, c)
3. (b, d)
4. (a, b, c)

Subtopic:  Concept of Work | Work Energy Theorem |
From NCERT
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NEET 2023 - Target Batch - Aryan Raj Singh

A bullet of mass \(m\) fired at \(30^\circ\) 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. Consider the following statements.

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.


Which of the above-given statement(s) is/are correct in respect of the bullet after it emerges out of the target?

1. (a), (c), (f)
2. (a), (d), (f)
3. (b), (d, (f)
4. (a), (b), (c)
Subtopic:  Work Energy Theorem |
 50%
From NCERT
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NEET 2023 - Target Batch - Aryan Raj Singh