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Questions >> JEEMAIN and NEET >> Physics >> Class11

Class11

Units and Measurement

Motion in a Straight Line

Motion in a Plane

Work, Power and Energy

System of Particles and Rotational Motion

Mechanical Properties of Solids

Mechanical Properties of Fluids

Thermal Properties of Matter

Kinetic Theory of Gases

a particle has initial velocity V=3i +4j and a constant force F = 4i-3j acts on the particle .prove that path of particle is parabolic.[where i,j represent unit vectors along x and y axis]

asked Nov 29, 2014 by harsha.wardan7

1 answer

two blocks m and M tied together with an inextensible string are at rest on rough horizontal surface with coefficient of friction " k ". the block m i pulled with a variable force F with a variable angle 'x' with the horizontal .the value of 'x' for which the least value of F is required to move the blocks given by

asked Nov 27, 2014 by harsha.wardan7

1 answer

A 60kg man stands on a spring scale in a lift.at some instant,he finds that the scale reading has changed from 60kg to 50kg for a while and then comes back to original mark.what should be concluded?

asked Nov 27, 2014 by harsha.wardan7

1 answer

A small marble is projected with a velocity of 10m/s in a direction 45 degrees from the horizontal y-direction on the smooth inclined plane . calculate magnitude of velocity after 2s?

asked Nov 27, 2014 by harsha.wardan7

1 answer

Velocity and acceleration transformation: A horizontal bar rotates with the constant angular velocity ω about a vertical axis which is fixed to a table and passes through one of the ends of that bar. A small coupling moves along the bar. Its velocity relative to the bar obeys the law v' = ar where a is a constant and r is the radius vector determining the distance between the coupling and the rotation axis. Find: (1) the velocity v and the acceleration α of the coupling relative to the table and depending on r; (2) the angle between the vectors v and α in the process of motion

asked Sep 20, 2014 by vishavjeetmor

1 answer

A spring whose natural length is 15 cm exerts a force of 45 N when stretched to a length of 20 cm.Find the work done in stretching the spring from a length of 20 cm to a length of 25 cm

asked Sep 2, 2014 by sreemathi.v

1 answer

A force of 1200 N compresses a spring from its natural length of 18 cm to a length of 16 cm. How much work is done in compressing it from 16 cm to 14 cm?

asked Sep 2, 2014 by sreemathi.v

1 answer

A spring is stretched 60 cm, and it takes a force of 40 Newtons to hold it there. How much work did it take to stretch the spring to this point?

asked Sep 2, 2014 by sreemathi.v

1 answer

A wall is tilted in by $15^{\large\circ}$ ,and a 2kg block is placed against the wall.The block is held in place with a spring.The coefficients of friction between the block and the wall are $\mu_s=0.61$ and $\mu_k=0.49$ .Holding the block in place requires that the spring be compressed by 12cm.What is the spring constant of the spring?

asked Sep 2, 2014 by sreemathi.v

1 answer

It takes 100J of work to stretch a spring 0.5m from its equilibrium position.How much work is needed to stretch it an additional 0.75m?

asked Sep 2, 2014 by sreemathi.v

1 answer

A force of 6 N is required to stretch a string from a natural length of 4 m to a length of 4.5 m.What work is required to stretch it to a length of 6 m.

asked Sep 2, 2014 by sreemathi.v

1 answer

Suppose 2 J of work is needed to stretch a spring from its natural length of 30 cm to a length of 42 cm.Then how far beyond its natural length will a force of 30 N keep the spring stretched?

asked Sep 2, 2014 by sreemathi.v

1 answer

Suppose 2 J of work is needed to stretch a spring from its natural length of 30 cm to a length of 42 cm.Then how much work is needed to stretch it from 30 cm to 40 cm.

asked Sep 2, 2014 by sreemathi.v

1 answer

A spring has a length of 15.4 cm and is hanging vertically from a support point above it.A weight with a mass of 0.200 kg is attached to the spring,causing it to extend to a length of 28.6cm.What is the value of the spring constant?

asked Sep 1, 2014 by sreemathi.v

1 answer

A spring has a natural length of 18 inches and a force of 20 lbs is required to stretch and hold the spring to a length of 24 inches. What is the work required in ft-lbs to stretch the spring from a length of 21 inches to a length of 26 inches?

asked Sep 1, 2014 by sreemathi.v

1 answer

A spring has a natural length of 1 meter.A force of 25 Newtons stretches the spring by $\large\frac{1}{4}$ of a meter.Determine how much work is done by stretching the spring from a length of 1.5 meters to 2.5 meters.

asked Sep 1, 2014 by sreemathi.v

1 answer

A spring has natural length 30 cm,and a force of 50 Newtons(N) is required to extend it to 35 cm.How much work is required to extend it from 32 to 36 cm?

asked Sep 1, 2014 by sreemathi.v

1 answer

A spring has a natural length of 20 cm. A 40 N force is required to stretch (and hold the spring) to a length of 30 cm. How much work is done in stretching the spring from 35 cm to 38 cm?

asked Sep 1, 2014 by sreemathi.v

1 answer

A block whose mass $m$ is $15\; kg$ slides on a horizontal frictionless surface with a constant speed $v$ of $3.7m/s$ .It is brought momentarily to rest as it compresses a spring in its path.By what distance $d$ is the spring compressed?The spring constant $k$ is $1500\;N/m$

asked Sep 1, 2014 by sreemathi.v

1 answer

A spring has a natural length of 14 meters.If a force of 5N is required to keep the spring stretched 2 meters.How much work is done in stretching the spring from its natural length to a length of 18 meters.

asked Sep 1, 2014 by sreemathi.v

1 answer

A gas in a piston cylinder assembly undergoes an expansion process where $PV^{1.5}$ =constant.The initial pressure is 3 bar,the initial volume is $0.1m^3$ and the final volume is $0.2m^3$ .Determine the work done for this process.

asked Sep 1, 2014 by sreemathi.v

1 answer

We have a cable that weighs 2lbs/ft attached to a bucket filled with coal that weighs 800lbs.The bucket is initially at the bottom of a 500 ft mine shaft.Determine the amount of work required to lift the bucket to the midpoint of the shaft.

asked Sep 1, 2014 by sreemathi.v

1 answer

A particle of mass 0.5 kg moves on the positive $x$ -axis under the action of a variable force $\large\frac{40}{x^2}$ newtons,directed away from origin..The particle passes through a point 2 metres from origin,with velocity $8ms^{-1}$ away from origin. Its experiences a constant resistance force of 6 newtons. Find the speed of the particle when it is 5 metres from origin.

asked Sep 1, 2014 by sreemathi.v

1 answer

Find the work done by F as it moves from a to b.

asked Sep 1, 2014 by sreemathi.v

1 answer

A 106g bullet is fired from a rifle having a barrel 0.441m long.Assuming the origin is placed where the bullet begins to move,the force exerted on the bullet by the expanding gas is $F=a+bx-cx^2$ ,where $a=13500N,b=8170N/m,c=24000N/m^2$ ,with $x$ in meters.With what velocity does the bullet exit the barrel?

asked Sep 1, 2014 by sreemathi.v

1 answer

A 106g bullet is fired from a rifle having a barrel 0.271m long.Assuming the origin is placed where the bullet begins to move,the force exerted on the bullet by the expanding gas is F=a+bx-cx $^2$ ,where a=13500N, b=8170N/m,c=24000N/m $^2$ ,with x in meters.Determine the work done by the gas on the bullet as the bullet travels the length of the barrel.

asked Sep 1, 2014 by sreemathi.v

1 answer

Force $F=(3x^2N)i+(4N)j$ acts on a particle changing only the kinetic energy of the particle.How much work is done on the particle as it moves from coordinates (2m,3m) to (3m,0m)?

asked Sep 1, 2014 by sreemathi.v

1 answer

What work is done by a force $F=(2xN)i+(3N)j$ ,with $x$ in meters,that moves a particle from a position $r_i=(2m)i+(3m)j$ to a position $r_f=-(4m)i-(3m)j$ ?

asked Sep 1, 2014 by sreemathi.v

1 answer

A particle moves along the $x$ -axis from $x=0$ to $x=1$ under the influence of the force $F=(1+x^2)^{-1}$ .Find the work done by this force.

asked Sep 1, 2014 by sreemathi.v

1 answer

A force $F_x$ acts on a particle.The force is related to the position of the particle by the formula $F_x=Cx^3$ ,where $C$ is a constant.Find the work done by this force on the particle when the particle moves from $x=1.5\;m$ to $x=3\;m$ .

asked Sep 1, 2014 by sreemathi.v

1 answer

Work done in time t on a body of mass $m$ which is accelerated from rest to a speed $v$ in time $t_1$ as a function of time $t$ is given by

asked Sep 1, 2014 by sreemathi.v

1 answer

A body is moving down a long inclined plane of angle of inclination $\theta$ . The coefficient of friction between the body and the plane varies as $\mu =0.5 \;x$ Where x is the distance moved down the plane . The body will have the maximum velocity when it has travelled a distance x given by

asked Aug 29, 2014 by meena.p

1 answer

A body is sliding down a rough inclined plane of angle of inclination $\theta$ for which the coefficient of friction varies with distance x as $\mu (x)=kx$ , where k is a constant . Here x is the distance moved by the body down the plane . The net force on the body will be zero at a distance $x_0$ given by :

asked Aug 29, 2014 by meena.p

1 answer

Two blocks of masses $m_1=5 \;kg$ and $m_2= 6\;kg$ are connected by a light string passing over a light friction less pulley as shown in fig. The mass $m_1$ is at rest on the inclined plane and mass $m_2$ hangs vertically . If the angle of incline $\theta =30^{\circ}$ , What is the magnitude and direction of the force of friction on the $5\;kg$ block . Take $g= 10 ms^{-2}$

asked Aug 29, 2014 by meena.p

1 answer

The vessels A and B of equal volume and weight are immersed in water to a depth h.The vessel A has an opening at the bottom through which water can enter.If the work done in immersing A and B are $W_A$ and $W_B$ respectively,then

asked Aug 28, 2014 by sreemathi.v

1 answer

A particle is moved along the $x$ -axis by a force which measures $\large\frac{10}{(1+x)^2}$ at a point $x$ feet from the origin.Find the work done (in ft-lb) in moving a particle from the origin to a distance of 9ft.

asked Aug 28, 2014 by sreemathi.v

1 answer

A particle moves under the effect of a force $F=Cx$ from $x=0$ to $x=x_1$ .The work done in the process is

asked Aug 28, 2014 by sreemathi.v

1 answer

A position dependent force $\overrightarrow{F}=(7-2x+3x^2)N$ acts on a small object of mass 2kg to displace it from $x=0$ to $x=5m$ .The work done in joules is

asked Aug 28, 2014 by sreemathi.v

1 answer

A uniform sphere of radius R and mass M is held at rest on an inclined plane of angle $\theta$ by a horizontal string , as shown in the figure. Let $R= 20 \;cm,M= 3\;kg,$ and $\theta= 30^{\circ}$ . What is the normal force exerted on the sphere by the inclined plane ?

asked Aug 28, 2014 by meena.p

1 answer

A cable weighing 2lbs/ft is used to lift 800 lbs of coal up a mineshaft 500 ft deep.Find out how much work is done in ft-lbs.

asked Aug 28, 2014 by sreemathi.v

1 answer

A man lifts 100 boxes each of mass 15 g to a height of 1.5 m. Find the work done by the man against gravity

asked Aug 28, 2014 by sreemathi.v

1 answer

How much work is done when a constant force of 500 N is used to push a cart through a displacement of magnitude 25 m to final position along the $x$ -axis

asked Aug 28, 2014 by sreemathi.v

1 answer

An $8.0\;kg$ box is released on a $30^{\circ}$ inclined and accelerates down the incline at $30\;m/s^2$ Find the frictional force impending its motion . How large is the coefficient of friction in this situation ?

asked Aug 28, 2014 by meena.p

1 answer

A constant force $F=(2\hat{i}+3\hat{j})$ newton displaces a body from position $r_1=(4\hat{i}-5\hat{j})$ metre to $r_2=(\hat{i}+3\hat{j})$ metre.Find the work done by the force.

asked Aug 28, 2014 by sreemathi.v

1 answer

How much work is done against gravity in lifting a 3kg object through a distance of 40cm?

asked Aug 28, 2014 by sreemathi.v

1 answer

A horizontal force F pulls a 20-kg carton across the floor at constant speed.If the coefficient of sliding friction between carton and floor is 0.60,how much work does F do in moving the carton 3.0m?

asked Aug 28, 2014 by sreemathi.v

1 answer

Figure shows the top view of two horizontal forces pulling a box along the floor the box is displaced 70cm along the broken line?What is the total work done by the two forces in pulling the box this distance?

asked Aug 28, 2014 by sreemathi.v

1 answer

A horizontal force of 25N pulls a box along a table.How much work does it do in pulling the box 80cm?

asked Aug 28, 2014 by sreemathi.v

1 answer

A cyclist comes to a skidding stop in 10 m. During this process, the force on the cycle due to the road is 200 N and is directly opposed to the motion.How much work does the road do on the cycle?

asked Aug 28, 2014 by sreemathi.v

1 answer

A $12-kg$ box is released from the top of an inclined that is $5.0\;m$ long and makes an angle of $40^{\circ}$ to the horizontal. A $60-N$ friction force impedes the motion of the box. How long will it take to reach the bottom of the incline ?

asked Aug 28, 2014 by meena.p

1 answer

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