A mass of 5 kg is moving along a circular path of radius 1 m. If the mas moves with 300 rev/min, its kinetic energy would be
 

1. 250π2

2. 100π2

3. 5π2

4. 0

Subtopic:  Concept of Work |
 72%
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

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
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

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
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

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. At the same time t, the work done on the two moving charged particles is

1. same as the same force law is involved in the two experiments.
2. less for the case of a position, as the position moves away more rapidly and the force on it weakens.
3. more for the case of a position, as the position moves away from a larger distance.
4. same as the work done by cha particle on the stationary proton.

Subtopic:  Concept of Work |
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

A man squatting on the ground gets straight up and stands. The force of reaction of the ground on the man during the process is

1. constant and equal to mg in magnitude.
2. constant and greater than mg in magnitude.
3. variable but always greater than mg.
4. at first, greater than mg and later becomes equal to mg.

Subtopic:  Concept of Work |
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh