Question 1 :
How many kilograms will a man working at the power of 100 W, be able to lift at constant speed of $1 \: m \: s^{-1}$ vertically ?<br>
Question 2 :
A glass ball is dropped from height 10 m. If there is 20% loss of energy due to impact, then after one impact, the ball will be upto
Question 4 :
Two bodies moving towards each other collide and move away in opposite directions. There is some rise in temperature of bodies because a part of the kinetic energy is converted into
Question 6 :
If the heart pushes 1 cc of blood in one second under pressure 20000 $N/m^2$ the power of heart is:
Question 7 :
The slope of the kinetic energy versus position vector gives the rate of change of
Question 9 :
Which of the following does not possess the ability to do work not because of motion?
Question 10 :
1 kilowatt-hour is the amount of .... by 1000 watt electric appliance when it operates for one hour.
Question 11 :
When a body is whirled in a circle, the work done by centripetal force on it is
Question 12 :
<div>Fill in the blanks:</div>One kilowatt is equal to ________ horse power.
Question 13 :
A body is under the action of two equal and opposite forces, each of 10 N. The body is displaced by 5 m.The work done is
Question 14 :
A boy walks 100 m on a levelled road carrying a load of 5kg on his back. What is the work done by the boy against the gravitational force? (${g = 10 m/s^2}$ )
Question 15 :
A ball is dropped from a height of 20 cm. Ball rebounds to a height of 10 cm. What is the loss of energy?
Question 16 :
A man pushes an $80N$ crate for a distance of $5.0m$ upward along a frictionless slope that makes an angle of $30^o$ with the horizontal. His force is parallel to the slope. If the speed of the crate decreases at a rate of $1.5m/s^2$, then the work done by the man is:<br/>
Question 18 :
The momentum of a body increases by 20%. The percentage increase in its kinetic energy is
Question 19 :
A ball hits the floor and rebounds after inelastic collision. In this case
Question 21 :
A pump motor is used to deliver water at a certain rate from a given pipe. To obtain 'n' times water from the same pipe at the same time, by what amount the power of the motor should be increased?
Question 23 :
An object of mass 10 kg is at a point A on a table. It is moved to a point B by a distance 5 m. If the line joining A and B is horizontal, then what is the work done on the object by gravitational force ?
Question 25 :
A rock of mass m is dropped to the ground from a height h. A second rock with mass 2m is dropped from the same height. When second rock strikes the ground, what is its kinetic energy?
Question 26 :
A body of mass 100g is rotating in a circular path of radius 'r' with constant speed.The work done in one complete revolution is:
Question 27 :
A boy carrying a box on his head is walking on a level road from one place to another on a straight road is doing no work against gravity.<br/>
Question 28 :
A lorry and a car moving with the same K.E. are brought to rest by applying the same retarding force, then
Question 29 :
A force of 20N acts on a body and the body moves through 1m at an angle of $45^0$ to the direction of the force.The work done by the force is_____
Question 30 :
A force $F$ acts on a body and displaces it by a distance $S$ in a direction at an angle $\theta$ with the direction of force. What should be the angle between the force and displacement to get zero work?
Question 31 :
A particle is moved from $O(0, 0)$ to $P(a, a)$ under a force $\vec{F}=\left(3\hat{i}+4\hat{j}\right)$ from two paths. Path $1$ is OP and path $2$ is OQP. Let $W_1$ and $W_2$ be the work done by this force in these two paths. Then?
Question 34 :
$250 kg$ of water per minute is to be drawn from a well $150 m$ deep. An electric pump of _______ can be used. $(g = 10 m/s^2) $ <br/>
Question 35 :
The work done in lifting1 kg mass to a height of 9.8 m is about
Question 37 :
Work done by centripetal force in revolving a satellite around the earth is
Question 38 :
In which one of the following cases is work done the maximum ?
Question 40 :
According to work-energy theorem, the work done by the net force on a particle is equal to the change in its
Question 41 :
A point mass of 1 kg collides elastically with a stationary point mass of 5 kg. After their collision, the 1 kg mass reverses its direction and moves with a speed of <img style='object-fit:contain' src="https://storage.googleapis.com/teachmint/question_assets/NEET/5e9411887b6ff3012e76ee8a"> . Which of the following statements(s) is/are correct for the system of these two masses?
Question 42 :
If the kinetic energy of a body becomes four times of its initial value, then new momentum will
Question 43 :
A ball is thrown vertically up-wards from the ground. Regarding the work done by air resistance, which of the following is correct?
Question 44 :
Mohan uses one television of $100$ W for $10$ hrs how much energy is consumed by Mohan.
Question 45 :
A sphere collides with another sphere of identical mass. After collision, the two spheres move. The collision is inelastic. Then the angle between the directions of the two spheres is
Question 49 :
A particle is acted upon by a force of constant magnitude which is always perpendicular to the velocity of the particle, the motion of the particle takes place in a plane. It follows that
Question 51 :
A {tex} 10 \mathrm { m } {/tex} long iron chain of linear mass density {tex} 0.8 \ \mathrm {kg m^{-1}}{/tex} is hanging freely from a rigid support. If {tex} \mathrm { kg } \mathrm { m } ^ { - 1 } {/tex} is hanging freely from a rigid support. If {tex} \mathrm { g } = 10 \mathrm { ms } ^ { - 2 } , {/tex} then the power required to left the chain upto the point of support in 10 second
Question 52 :
A particle of mass {tex} 10 \mathrm { g } {/tex} moves along a circle of radius {tex} 6.4 \mathrm { cm } {/tex} with constant tangential acceleration. What is the magnitude of this acceleration if the kinetic energy ofthe particle becomes equal to {tex}8 \times 10^{-4} \mathrm J {/tex} by the end or the second revolution after the inning of the motion ?
Question 53 :
A metallic wire of length L metre extends by {tex} \ell {/tex} metre when stretched by suspending a weight Mg from it. The mechanical energy stored in the wire is
Question 54 :
How much work must be done by a force on $50\ $ <br> $kg$ body in order to accelerate it from rest to $20\ m/s$  in $10\ $ <br> $s$ ?
Question 55 :
A bead of mass {tex} m {/tex} is sliding down the fixed inclined rod without friction. It is connected to a point {tex} P {/tex} on the horizontal surface with a light spring of spring constant {tex} k . {/tex} The bead is initially released from rest and the spring is initially unstressed and vertical. The bead just stops at the bottom of the inclined rod. Find the angle which the inclined rod makes with horizontal.<br><img style='object-fit:contain' src="https://storage.googleapis.com/teachmint/question_assets/NEET/5e0ee77bdc973f528b538d17">
Question 56 :
A coolie 1.5 m tall raises a load of 80 kg in 2 s from the ground to his head and then walks a distance of 40 m in another 2 s. The power developed by the coolie is <img style='object-fit:contain' src="https://storage.googleapis.com/teachmint/question_assets/NEET/5e940eed7b6ff3012e76e5ae">
Question 57 :
Energy released in the fission of a single $_{92}U^{235}$ nucleus is $200\ MeV$. The fission rate of $_{92}U^{235}$ fuelled reactor operating at a power level of $5\ watt$ is
Question 58 :
Two frames, one stationary and the other moving, are initially coincident. Two observers in the two frames observe a body initially at rest in the coincident frame. A constant force $F$ starts acting on the body along horizontal axis, when moving frame starts to separate from the fixed frame. Work done $W$ as observed by the stationary frame and $W'$ as observed from the moving frame are compared to the each other as:
Question 59 :
Two identical beads of {tex} \mathrm { m } = 100 {/tex} gram are connected by an inextensible massless string can slide along the two arms {tex} \mathrm { AC } {/tex} and {tex} \mathrm { BC } {/tex} of a rigid smooth wire frame in a vertical plane. If the system is released from rest, the kinetic energy of the first particle when they have moved by a distance of {tex} 0.1 \mathrm { m } {/tex} is {tex} 8 \mathrm { x } \times 10 ^ { - 3 } \mathrm { J } {/tex}. Find the value of {tex} \mathrm { x } . \left( \mathrm { g } = 10 \mathrm { m } / \mathrm { s } ^ { 2 } \right) {/tex}<br><img style='object-fit:contain' src="https://storage.googleapis.com/teachmint/question_assets/NEET/5e0ee5b18420d95285473c13"><br>
Question 60 :
The block of mass {tex} M {/tex} moving on the frictionless horizontal surface collides with the spring of spring constant {tex} k {/tex} and compresses it by length {tex} L . {/tex} The maximum momentum of the block after collision is<br><img style='object-fit:contain' src="https://storage.googleapis.com/teachmint/question_assets/NEET/5e0ee856dc973f528b538db5"><br>
Question 61 :
A wind-powered generator converts wind energy into electrical energy. Assume that the generator converts a fixed fraction of the wind energy intercepted by its blades into electrical energy. For wind speed {tex} v , {/tex} the electrical power output will be proportional to
Question 62 :
A variable force {tex} P {/tex} is maintained tangent to a frictionless cylindrical surffaine of radius {tex} a {/tex} as shown in figure. By slowed and the spring towhich block of weight {tex} W {/tex} is moved and the spring towhich it is stretched from position 1 to position 2 . The work done by the force {tex} P {/tex} is<br><img style='object-fit:contain' src="https://storage.googleapis.com/teachmint/question_assets/NEET/5e0ee748dc973f528b538ced"><br>
Question 63 :
Two small bodies of masses '{tex}m{/tex}' and '{tex} 2 { m } {/tex}' are placed in a fixed smooth horizontal circular hollow tube of mean radius as shown. The mass '{tex}m{/tex}'is moving with speed '{tex}u{/tex}'and the mass {tex} 2 \mathrm { m } {/tex} ' is stationary. After their first collision, the time elapsed for next collision is [ coefficieient of restitution {tex} \mathrm { e } = 1 / 2 ] {/tex}<br><img style='object-fit:contain' src="https://storage.googleapis.com/teachmint/question_assets/NEET/5e0ee821dc973f528b538d8c"><br>
Question 64 :
The speed of an object of mass {tex} m {/tex} dropped from an inclined plane (frictionless), at the bottom of the plane, depends on:
Question 65 :
A body of mass 2 kg is thrown up vertically with kinetic energy of 490 J. The height at which the kinetic energy of the body becomes half of its original value is?
Question 66 :
A rigid body of mass m is moving in a circle of radius r with a constant speed v.The force on the body is $\displaystyle \frac{mv^2}{r}$ and is directed towards the centre. What is the work done by this force in moving the body over half the circumference of the circle.
Question 67 :
Work done in moving a $50\  kg$ block through a horizontal distance of $10\  m$ by applying a force of $100\ N$ which makes an angle of $60^\circ$ with the horizontal is:
Question 68 :
A bullet is fired normally on a wooden plank, which is immovable. It loses 25% of its momentum in penetrating a thickness of 3.5 cm the total thickness penetrated by the bullet is
Question 69 :
A particle is acted upon by constant forces $4\hat{\mathrm{i}}+\hat{\mathrm{j}}-3\hat{\mathrm{k}}$ and $3\hat{\mathrm{i}}+\hat{\mathrm{j}}-\hat{\mathrm{k}}$ which displace it from a point $\hat{\mathrm{i}}+2\hat{\mathrm{j}}+3\hat{\mathrm{k}}$ to the point $5\hat{\mathrm{i}}+4\hat{\mathrm{j}}+\hat{\mathrm{k}}$. The work done is standard units by the forces is given by: <br><br>
Question 70 :
A ball moves in a frictionless inclined table without slipping. The work done by the table surface on the ball is
Question 71 :
<b>Statement I </b> In an elastic collision between two bodies, the relative speed of the bodies after collision is equal to the relative speed before the collision.<BR> <b>Statement II </b>Inan elastic collision, the linear momentum of the system is conserved.
Question 72 :
When a force vector $\overline{\mathrm{F}}=(\vec{\mathrm{i}}+2\vec{\mathrm{j}}+\vec{\mathrm{k}})\mathrm{N}$ acts on a body and produces a displacement of $\overline{\mathrm{S}}=(4\vec{\mathrm{i}}+\vec{\mathrm{j}}+7\vec{\mathrm{k}})\mathrm{m}$, then the work done is :<br/>
Question 73 :
The kinetic energy of a body is increased by 300%. What is the percentage increase in the momentum of the body?
Question 74 :
What power must a sprinter, weighing 80 kg, develop from the start if he has to impart a velocity of <img style='object-fit:contain' src="https://storage.googleapis.com/teachmint/question_assets/NEET/5e940f1b7b6ff3012e76e64f"> to his body in 4 s?
Question 75 :
A force which varies with time $t$ as $\vec F=(3t \hat i +5\hat j )$ acts on a body due to which its displacement varies as $\vec s = (2t^2 \hat i - 5 \hat j)$ where $t$ is in seconds. Work done by this force in initial $2\ s$ is:
Question 76 :
A pump motor is used to deliver water at a certain rate from a given pipe. To obtain twice as much water from the same pipe in the same time, power of the motor has to be increased to
Question 77 :
The position of a particle of mass $4 g$, acted upon by a constant force is given by $x=4{ t }^{ 2 }+t$, where $x$ is in metre and $t$ in second. The work done during the first $2 s$ is
Question 78 :
A force of 2 x $10^4$ is applied to the larger piston of a hydraulic machine of $900cm^2$ in area. Neglecting friction, calculate the force exerted on the smaller piston of area $10cm^2$ to accomplish this task.
Question 79 :
A bullet hits and gets embedded in a solid block resting on a frictionless surface. In this process which one of the following is correct?
Question 80 :
A force $\overrightarrow{F}= (2\hat{1}+5\hat{j}+k)$ is acting on a particle. The particle is first displaced from $(0,\ 0\ ,\ 0)$ to $(2m,\ 2m,\ 0)$ along the path $x= y$ and then from $(2m,\ 2m,\ 0)$ to $(2m,\ 2m,\ 2m)$ along the path $x= 2,,\ y\ = 2m.$ The toal work done in the complete path is:
Question 81 :
Write true or false for the following statements:<br>In order to get minimum work, the angle between force and displacement should be 90.
Question 82 :
A uniform force of ($3\hat{i}+\hat{j}$) newton acts on a particle of mass 2 kg. Hence the particle is displaced from position $(2\hat{i}+\hat{k})$ meter to position $(4\hat{i}+3\hat{j}-\hat{k})$ meter. The work done by the force on the particle is
Question 83 :
A one kilowatt motor is used to pump water from a well 10 m deep. The quantity of water pumped out per second is nearly
Question 84 :
A body is displaced from $\vec r_A=(2 m, 4 m, -6 m)$ to $\displaystyle \vec{r_{B}}= \left ( 6\hat{i}-4\hat{j}+2\hat{k} \right )$ m under a constant force $\displaystyle \vec{F}= \left ( 2\hat{i}+3\hat{j}-\hat{k} \right )N.$ Find the work done.
Question 85 :
In the above example, the work done is minimum when the body is
Question 88 :
When acted upon by a force $F$, a body suffers a displacement $S$. The work done will be positive if the angle between $F$ and $S$ be
Question 89 :
Assertion: kilowatt hour is the unit of electric power.
Reason: KWH is a commercial unit used for expressing consumed electrical energy.
Question 90 :
Forces acting on a particle have magnitudes of 14, 7, and 7 N and act in the direction of vectors $6\hat { i } +2\hat { j } +3\hat { k } ,\quad 3\hat { i } -2\hat { j } +6\hat { k } ,\quad 2\hat { i } -3\hat { j } -6\hat { k } $ respectively. The forces remain constant while the particle is displaced from point A: (2, 1, -3) to B: (5, 1, 1). Find the work done. The coordinates are specified in meters.<br/>
Question 91 :
A force $F = ( 6 i - 8 j ) N ,$ acts on a particle and displaces it over $4 \mathrm { m }$ along the X-axis and $6 m$ along the Y-axis. The total work done during the two displacements is:<br/>
Question 92 :
Consider the following two statements <br> 1. Linear momentum of a system of particles is zero <br> 2. Kinetic energy of a system of particles is zero, <br> Then
Question 93 :
Consider the following statements <img style='object-fit:contain' src="https://storage.googleapis.com/teachmint/question_assets/NEET/5e940ee27b6ff3012e76e56c"> and <img style='object-fit:contain' src="https://storage.googleapis.com/teachmint/question_assets/NEET/5e940ed2a403481f073b49b2"> and identify the correct answer <br>A. In an elastic collision, if a body suffers a head on collision with another of same mass at rest, the first body comes to rest while the other starts moving with the velocity of the first one <br> B. Two bodies of equal mass suffering a head on elastic collision merely exchange their velocities.
Question 94 :
A stone is dropped from the top of a tall tower. The ratio of the kinetic energy of the stone at the end of three seconds to the increase in the kinetic energy of the stone during the next three seconds is
Question 95 :
A body of mass m is rest. Another body of same mass moving with velocity v makes head on elastic collision with the first body. After collision the first body starts to moves with velocity
Question 96 :
A bullet hits and gets embedded in a solid block resting on a horizontal frictionless table. What is conserved
Question 97 :
A force of(5+3x)N acting on a body of mass 20 kg along the x-axis displaces it from x=2m to x=6m.The Work done by the force is
Question 98 :
If a skater of weight 3 kg has initial speed 32 m/s and second one of weight 4 kg has 5 m/s. After collision, they have speed (couple) 5 m/s. Then, the loss in K.E. is
Question 99 :
In which of the following cases, can the work done increase the potential energy?
Question 100 :
A body projected vertically from the earth reaches a height equal to earth’s radius before returning to the earth. The power exerted by the gravitational force is greatest
Question 101 :
A car of mass {tex} m {/tex} starts from rest and accelerates so that the instantaneous power delivered to the car has a constant magnitude {tex} p _ { 0 } {/tex}. The instantaneous velocity of this car is proportiourl to:
Question 102 :
A mass of {tex} 20 \mathrm { kg } {/tex} moving with a speed of {tex} 10 \mathrm { m } / \mathrm { s } {/tex} collides with another stationary mass of {tex} 5 \mathrm { kg } {/tex}. As a result of the collision, the two masses stick together. The kinetic energy of the composite mass will be
Question 103 :
A {tex} 2 \mathrm { kg } {/tex} block slides on a horizontal floor with a speed of {tex} 4 \mathrm { m } / \mathrm { s } {/tex}. It strikes a uncompressed spring, and compresses it till the block is motionless. The kinetic friction force is {tex} 15 \mathrm { N } {/tex} and spring constant is {tex} 10,000 \mathrm { N } / \mathrm { m } {/tex}. The spring compresses by
Question 104 :
If a machine gun fires n bullets per second each with kinetic energy {tex} \mathrm { K } , {/tex} then the power of the machine gun is
Question 106 :
A body is moved along a straight line by a machine delivering constant power. The distance moved by the body in time t is proportional to
Question 107 :
When a body is projected vertically up from the ground with certain velocity, its potential energy and kinetic energy at a point A are in the ratio {tex} 2: 3 . {/tex} If the same body is projected with double the previous velocity, then at the same point A the ratio of its potential energy to kinetic energy is
Question 108 :
A body of mass {tex} 0.5 \mathrm { kg } {/tex} travels in a straight line with velocity {tex} v = 5 x ^ { 3 / 2 } . {/tex} The work done by the net force during the displacement from {tex} x = 0 {/tex} to {tex} x = 2 \mathrm { m } {/tex} is
Question 109 :
A particle moves under the effect of a force {tex} \mathrm { F } = \mathrm { cx } {/tex} from {tex} \mathrm { x } = 0 {/tex} to {tex} \mathrm { x } = \mathrm { x } _ { 1 } , {/tex} the work done in the process is
Question 110 :
A spherical ball of mass {tex} 20 \mathrm { kg } {/tex} is stationary at the top of a hill of height {tex} 100 \mathrm { m } {/tex}. It rolls down a smooth surface to the ground, then climbs up another hill of height {tex} 30 \mathrm { m } {/tex} and finally rolls down to a horizontal base at a height of {tex} 20 \mathrm { m } {/tex} above the ground. The velocity attained by the ball is
Question 111 :
The power required to keep the belt moving is ____ $\dfrac{d}{dt}$ (KE)
Question 112 :
A force {tex} F = - K ( y \hat { i } + x \hat { j } ) {/tex} (where {tex} K {/tex} is a positive constant) acts on a particle moving in the {tex} x y {/tex} plane. Starting from the origin, the particle is taken along the positive {tex} x {/tex} axis to the point {tex} ( a , 0 ) , {/tex} and then parallel to the {tex} y {/tex} axis to the point {tex} ( a , a ) , {/tex} The total work done by the force {tex} F {/tex} on the particle is
Question 113 :
A uniform force of {tex} ( 3 \hat { i } + \hat { j } ) {/tex} newton acts on a particle of mass {tex} 2 \mathrm { kg } {/tex}. The particle is displaced from position {tex} ( 2 \hat { i } + \hat { k } ) {/tex} meter to position {tex} ( 4 \hat { i } + 3 \hat { j } - \hat { k } ) {/tex} meter. The work done by the force on the particle is
Question 114 :
A boy pushes a toy box {tex} 2.0 \mathrm { m } {/tex} along the floor by means of a force of {tex} 10 \mathrm { N } {/tex} directed downward at an angle of {tex} 60 ^ { \circ } {/tex} to the horizontal. The work done by the boy is
Question 115 :
A block of mass {tex} 0.50 \mathrm { kg } {/tex} is moving with a speed of {tex} 2.00\ \mathrm { ms } ^ { - 1 } {/tex} on a smooth surface. It strikes another mass of {tex} 1.00 \ \mathrm { kg } {/tex} and then they move together as a single body. The energy loss during the collision is
Question 116 :
When after collision the deformation is not relived and the two bodies move together after the collision, it is called
Question 117 :
A force F = – K (yi + xj) (where K is a positive constant) acts on a particle moving in the xy-plane. Starting from the origin, the particle is taken along the positive x-axis to the point (a, 0) and then parallel to the y-axis to the point (a, a). The total work done by the force F on the particles is
Question 118 :
An athlete in the olympic games covers a distance of {tex} 100 \mathrm { m } {/tex} in {tex} 10 \mathrm { s } {/tex}. His kinetic energy can be estimated to be in the range
Question 119 :
A man of weight $50\  kg$ carries an object to a height of $20\ m$ in a time of $10\  s$. The power used by the man in the this process is $2000\ W$, then find the mass of the object carried by the man.<br/>[assume $g= 10 ms^{-2}]$
Question 120 :
A block of mass {tex} 1 \mathrm { kg } {/tex} is pulled along the curve path {tex} \mathrm {A C B }{/tex} by a tangential force as shown in figure. The work done by the frictional force when the block moves from {tex} \mathrm A {/tex} to {tex}\mathrm B {/tex} is<br><img style='object-fit:contain' src="https://storage.googleapis.com/teachmint/question_assets/NEET/5e0ee6688420d95285473c80"><br>
Question 121 :
Calculate the work done on the tool by {tex} \vec { F } {/tex} if this displacement is along the straight line {tex} y = x {/tex} that connects these two points.
Question 122 :
Two bodies {tex} A {/tex} and {tex} B {/tex} having masses in the ratio of 3: 1 possess the same kinetic energy. The ratio of linear momentum of {tex} B {/tex} to {tex} A {/tex} is
Question 123 :
A {tex}10{/tex} H.P. motor pumps out water from a well of depth {tex} 20 \mathrm { m } {/tex} and fills a water tank of volume {tex}22380{/tex} litres at a height of {tex}10 \mathrm { m } {/tex} from the ground. The running time of the motor to fill the empty water tank is {tex} \left( \mathrm { g } = 10 \mathrm { ms } ^ { - 2 } \right) {/tex}
Question 124 :
A uniform chain of length 2 m is kept on a table such that a length of 60 cm hangs freely from the edge of the table. The total mass of the chain is 4 kg. What is the work done in pulling the entire chain on the table?
Question 125 :
One man takes {tex} 1 \mathrm { min } {/tex}. to raise a box to a height of {tex}1{/tex} metre and another man takes {tex} 1 / 2 \mathrm { min } {/tex}. to do so. The energy of the
Question 126 :
A body is acted upon by a force $ F = \hat{i} + 2 \hat{j} + 3 \hat{k} $ . The work done by the force in displacing it from $ (0, 0, 0) $ to $ (0,0,4m)$ will be -
Question 127 :
If the momentum of a body is increased by <b>50%</b> then the percentage increase in its kinetic energy is
Question 128 :
A body of mass 1 kg begins to move under the action of a time dependent force {tex} \vec F{/tex} = (2t{tex} \hat i{/tex}+3{tex}t^2 \hat j{/tex})N, where {tex} \hat i{/tex}and {tex} \hat j{/tex} are unit vectors along x and y axis. What power will be developed by the force at the time t?
Question 129 :
A body moves a distance of {tex} 10 \mathrm { m } {/tex} along a straight line under the action of a force of {tex}5{/tex} newtons. If the work done is {tex}25{/tex} joules, the angle which the force makes with the direction of motion of body is
Question 130 :
The coefficient of restitution e for a perfectly elastic collision is
Question 131 :
A body of mass m accelerates uniformly from rest to $v_1$ in time $t_1$ . As a function of t, the instantaneous power delivered to the body is: <br/>
Question 132 :
A bomb of mass {tex}9 \mathrm{kg}{/tex} explodes into the pieces of masses {tex} 3 \mathrm { kg } {/tex} and {tex} 6 \mathrm { kg } {/tex}. The velocity of mass {tex} 3 \mathrm { kg } {/tex} is {tex} 16 \mathrm { m } / \mathrm { s } {/tex}. The kinetic energy of mass {tex} 6 \mathrm { kg } {/tex} in joule is
Question 133 :
A ball moving with velocity {tex} 2 \mathrm { m } / \mathrm { s } {/tex} collides head on with another stationary ball of double the mass. If the coefficient of restitution is {tex} 0.5{/tex} ,then their velocities (in {tex} \mathrm { m } / \mathrm { s } ) {/tex} after collision will be
Question 135 :
A bullet is fired and gets embedded in block kept on table. If table is frictionless, then
Question 136 :
A vehicle is moving with a uniform velocity on a smooth horizontal road, then power delivered by its engine must be
Question 137 :
A body of mass {tex} 1 \mathrm { kg } {/tex} begins to move under the action of a time dependent force {tex} \vec { \mathrm { F } } = \left( 2 \mathrm { t } \hat { \mathrm { i } } + 3 \mathrm { t } ^ { 2 } \hat { \mathrm { j } } \right) \mathrm { N } {/tex} where {tex} \hat { \mathrm { i } } {/tex} and {tex} \hat { \mathrm { j } } {/tex} are unit vectors along {tex} \mathrm { x } {/tex} and {tex} \mathrm { y } {/tex} axis. What power will be developed by the force at the time {tex} \mathrm {t} {/tex} ?
Question 138 :
A <b>10 m</b> long iron chain of linear mass density <b>0.8 kgm<sup>-1</sup></b> is hanging freely from a rigid support. If <b>g = 10 ms<sup>-2</sup></b>, then the power required to left the chain upto the point of support in 10 second
Question 139 :
A vehicle of mass $M$ is accelerated on a horizontal frictionless road under a force changing its velocity from $u$ to $v$ and distance covered is $S$. A constant power $P $ is given by the engine of the vehicle. The $v$ is equal to
Question 140 :
The work done in sliding a wooden box of mass $5\ kg$ along a friction less inclined plane of inclination ${30}^{o}$ and length $10\ m$ is______$J$. $(g=10\ {ms}^{-2})$
Question 141 :
Two blocks of masses {tex} m _ { 1 } = 10 \mathrm { kg } {/tex} and {tex} m _ { 2 } = 20 \mathrm { kg } {/tex} are connected by a spring of stiffness {tex} k = 200 \mathrm { N } / \mathrm { s } {/tex} {tex} \mathrm { m } {/tex}. The coefficient of friction between the blocks and the fixed horizontal surface is {tex} \mu = 0.1 . {/tex} Find the minimum constant horizontal force {tex} F {/tex} (in newtons) to be applied to {tex} \mathrm { m } _ { 1 } {/tex} in order to slide the mass {tex} m _ { 2 } . {/tex} <br> [Take {tex} \mathrm {g= 10 m/s ^2}{/tex}
Question 142 :
A particle is taken round a circle by application of force. The work done by the force is
Question 143 :
A bullet of mass {tex} 20 \mathrm { g } {/tex} and moving with {tex} 600 \mathrm { m } / \mathrm { s } {/tex} collides with a block of mass {tex} 4 \mathrm { kg } {/tex} hanging with the string. What is velocity of bullet when it comes out of block, if block rises to height {tex} 0.2 \mathrm { m } {/tex} after collision?
Question 144 :
In an inelastic collision, which of the following does not remain conserved?
Question 145 :
According to work-energy theorem, the work done by the net force on a particle is equal to the change in its
Question 146 :
If W represents the work done, then match the two columns:<br><table>
<tr><th>Column I </th> <th>Column II</th> </tr>
<tr><td>(A)Force is always along the velocity</td> <td>(1)W=0</td> </tr>
<tr><td>(B)Force is always perpendicular to velocity </td> <td>(2)W<0</td> </tr>
<tr><td>(C)Force is always perpendicular to acceleration</td> <td>(3)W>0</td> </tr>
<tr><td>(D)The object is stationary but the point of application of the force moves on the object</td> <td></td> </tr>
</table>
Question 147 :
Two blocks of masses {tex} m{/tex} and {tex}M{/tex} are joined with an ideal spring of spring constant {tex}k{/tex} and kept on a rough surface as shown. The spring is initially unstretched and the coefficient of friction between the blocks and the horizontal surface is {tex} \mu . {/tex} What should be the maximum speed of the block of mass {tex} M {/tex} such that the smaller block does not move?<br><img style='object-fit:contain' src="https://storage.googleapis.com/teachmint/question_assets/NEET/5e0ee764dc973f528b538d04">
Question 148 :
If two like charged particles are brought near one another, the potential energy of the system will
Question 149 :
Which of the following must be known in order to determine the power output of an automobile?
Question 150 :
If a shell fired from a cannon, explodes in mid air, then