NEET Questions - Physics - Work Energy And Power

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How much is the work done in pulling up a block of wood weighing 2KN for a length of 10m on a smooth plane inclined at an angle of 30o with the horizontal ?

1.732 KJ
17.32 KJ
10 KJ
100 KJ

A force of 7N, making an angle $ \theta $ with the horizantal, acting on an object displaces it by 0.5m along the horizontal direction. If the object gains K.E. of 2J, what is the horizontal component of the force ?

2N
4 N
1N
14 N

A 60 kg JATAN with 10 kg load on his head climbs 25 steps of 0.20m height each. what is the work done in climbing ? $ (g = 10 m/s^2) $

5J
350J
100J
3500J

A ball of mass 5 kg is stiding on a plane with intial velocity of 10 m/s. If co- efficient of friction between surface and ball is 1/2 then before stopping it will describe...... $ (g = 10 m/s^ 2) $

12.5m
5m
7.5 m
10 m

The force constant of a wire is K and that of the another wire is 3k when both the wires are stretched through same distance, if work done are $W_1 and W_2,$ then...

$w_2 = 3 w_1^2 $
$ w_2 = 0.33 w_1 $
$ w_2 = w_1 $
$ w_2 = 3 w_1 $

A ball is released from the top of a tower. what is the ratio of work done by force of gravity in first, second and third second of the motion of the ball ? $ [ h_n \alpha (2n-1) ] $

1:2:3
1:4:9
1:3:5
1:5:3

A spring of spring constant $ 10 ^3 n/m $ is stretched initially 4cm from the unstretched position. How much the work required to stretched it further by another 5 cm ?

6.5 NM
2.5NM
3.25NM
6.75NM

The mass of a car is 1000 kg. How much work is required to be done on it to make it move with a speed of 36 km/h ?

$ 2.5 \times 10^4 J $
$ 5 \times 10^3 J $
$ 500 J $
$ 5 \times 10^4 J $

A body of mass 6 kg is under a force, which causes a displacement in it given by $ S = { 2 t^3 \over 3} $ (in m). Find the work done by the force in first one seconds.

2 J
3.8J
5.2 J
24J

A spring gun of spring constant $ 90 \times 10^2 N / M $ is compressed 4cm by a ball of mass 16g. If the trigger is pulled, calculate the velocity of the ball.

60 m/s
3 m/s
90 m/s
30 m/s

A uniform chain of length 2m is kept on a table such that a length of 50cm hangs freely from the edge of the table. The total mass of the chain is 5kg. What is the work done in pulling the entire chain on the table. $(g = 10 m\s^2)$

7.2 J
3J
4.6 J
120 J

A uniform chain of length L ans mass M is lying on a smooth table and one third of its is hanging vertically down over the edge of the table. If g is acceleration due to gravity, the work required to pull the hanging part on to the table is

MgL
MgL/3
MgL /9
MgL/18

A block of mass 5 kg is resting on a smooth surface. At what angle a force of 20N be acted on the body so that it will acquired a kinetic energy of 40J after moving 4m

$ 30 ^ \circ $
$ 45 ^ \circ $
$ 60 ^ \circ $
$ 120 ^ \circ $

Natural length of a spring is 60 cm, and its spring constant is 2000N/m. A mass of 20kg is hung from it. The extension produced in the spring is. $ (g = 9.8 m/s^2) $

4.9 cm
0.49cm
9.8cm
0.98cm

The potential energy of a body is given by $ U = A - Bx^2 $ (where x is displacement). The magnitude of force acting on the particle is

constant
proportional to x
proportional to $x^2$
Inversely proportional to x

NEET Physics Questions: Work Energy And Power