An elevator and its load have a total mass of 800 kg .Find the tension in the supporting cable when the elevator, moving downward at 10 m/s is brought to rest with constant acceleration in a distance of 25 m. ( Take g = 10m/s2 ) :-

(1) 6400 N

(2) 8000 N

(3) 9600 N

(4) Zero

Subtopic:  Application of Laws |
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

Two blocks A and B of masses 3m and m respectively are connected by a massless and inextensible string. The whole system is is suspended by a massless spring as shown in figure. the magnitudes of acceleration of A and B immediately after the string is cut, are respectively

1. g, g/3

2. g/3, g

3. g, g

4. g/3, g/3

 

 

Subtopic:  Spring Force |
 70%
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints

A car is negociating a curved road of radius R. The road is banked at angle θ. The coefficient of friction between the car and the road is μs. The maximum safe velocity on this road is 

(a)gRtanθ+μs1μstanθ 

(b) gRtanθ+μs1μstanθ

(c) gR2tanθ+μs1μstanθ

(d) gR2tanθ+μs1μstanθ

Subtopic:  Banking of Roads |
 83%
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints

The length of a spring is l1 and l2, when stretched with a force of 4 N and 5 N respectively. Its natural length is

1. l2 + l1

2. 2(l2-l1)

3. 5l1 - 4l2

4. 5l2 - 4l1

Subtopic:  Spring Force |
 77%
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints

Two stones of masses m and 2m are whirled in horizontal circles, the heavier one in a radius r2 and the lighter one in the radius r. The tangential speed of lighter stone is n times that of heavier stone when they experience the same centripetal forces. The value of n is:

1. 2 2. 3
3. 4 4.
Subtopic:  Uniform Circular Motion |
 67%
From NCERT
NEET - 2015
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
Links
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

One end of the string of length l is connected to a particle of mass m and the other end is connected to a small peg on a smooth horizontal table. If the particle moves in a circle with speed v, the net force on the particle (directed towards the centre) will be: (T represents the tension in the string)

1. \(T \) 2. \(T+\frac{m v^2}{l} \)
3. \(\mathrm{T}-\frac{m v^2}{l} \) 4. \(\text{Zero}\)
Subtopic:  Uniform Circular Motion |
 53%
From NCERT
NEET - 2017
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
Links
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

A spring of force constant k is cut into lengths of ratio 1:2:3. They are connected in series and the new force constant is k'. If they are connected in parallel and force constant is k'', then k':k'' is 

(1) 1:6

(2) 1:9

(3) 1:11

(4) 6:11

Subtopic:  Spring Force |
 72%
From NCERT
NEET - 2017
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

Three blocks A, B and C of masses 4 kg, 2 kg and 1 kg respectively, are in contact on a frictionless surface, as shown. If a force of 14 N is applied on the 4 kg block, then the contact force between A and B is


1.2N

2. 6N

3. 8N

4. 18N

Subtopic:  Application of Laws |
 80%
From NCERT
NEET - 2015
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 block A of mass m1 rests on a horizontal table. A light string connected to it passes over a frictionless pulley at the edge of table and from its other end another block B of mass m2 is suspended. The coefficient of kinetic friction between the block and the table is  μk. When the block A is sliding on the table, the tension in the string is

1. (m2km1)g /(m1+m2)

2. (m2km1)g/(m1+m2)

3. m1m2(1+μk)g/(m1+m2)

4. m1m2(1-μk)g/(m1+m2)

Subtopic:  Friction |
 59%
From NCERT
NEET - 2015
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 plank with a box on it at one end is gradually raised about the other end. As the angle of inclination with the horizontal reaches 30°, the box starts to slip and slides 4.0 m down the plank in 4.0 s. The coefficients of static and kinetic friction between the box and the plank will be. respectively

1. 0.6 and 0.6

2. 0.6 and 0.5

3. 0.5 and 0.6

4. 0.4 and 0.3

Subtopic:  Friction |
 71%
From NCERT
NEET - 2015
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