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NEET - Grade 11 - Physics - Work, Energy and Power - Importance and Snapshot of Work Energy And Power - Study ref# 707

Introduction: The term ‘work’, ‘energy’ and ‘power’ are frequently used in everyday language. A farmer ploughing the field, a construction worker carrying bricks, a student studying for a competitive examination, all are said to be wor... read more

NEET - Grade 11 - Physics - Work, Energy and Power - Importance and Snapshot of Work Energy And Power - Study ref# 708

Following sections must be covered to understand Work, Energy and Power: 1. Introduction 2. Notions of works and kinetic energy: The work energy-theorem 3. Work 4. Kinetic energy 5. Work done by a variable force 6. The w... read more

NEET - Grade 11 - Physics - Work, Energy and Power - Target Setup for Work Energy And Power - Study ref# 709

Student requires to achieve the following milestones to get better grip over Work, Energy And Power. The milestones / targets are as follows:- Starting Point: Days 0Test TypeAppear on TestTarget TestsScorePractice Test000%Chapter... read more

NEET - Grade 11 - Physics - Work, Energy and Power - Study ref# 318

A person get greater blow when he falls on a hard floor than when he falls on a sand from the same height. Explain. Answer: Blow received by the person is equal to the rate of change of his momentum. When the man falls on the hard floor from a certai... read more

NEET - Grade 11 - Physics - Work, Energy and Power - Study ref# 319

Is friction a conservative force? Answer: No, because 1) Work done against friction depends on the path and 2) Work done in a closed path against friction in non – zero.... read more

NEET - Grade 11 - Physics - Work, Energy and Power - Study ref# 320

Give the conditions under which a force is called Conservative force. Answer: Any force is conservative if, 1) Work done against is independent of path and 2) Work done in a closed path is zero.... read more

NEET - Grade 11 - Physics - Work, Energy and Power - Study ref# 321

A mass is moving in a circular path with constant speed. What is the work done in ¾th of rotation? Answer: Since centripetal force and displacement are perpendicular, work done is zero.... read more

NEET - Grade 11 - Physics - Work, Energy and Power - Study ref# 322

Two bodies m1 and m2 (m1 > m2) have equal kinetic energies. Which will have more momentum? Answer: m1 will have the more momentum.As, E=p2/2mp=√2mE... read more

NEET - Grade 11 - Physics - Work, Energy and Power - Study ref# 323

Draw the variation of potential energy stored in a spring as a function of extension. Answer: Kinetic energy  = Potential energy = Where v is the velocity at a distance x from mean position.... read more

NEET - Grade 11 - Physics - Work, Energy and Power - Study ref# 324

Is it possible to have a collision in which all kinetic energy is lost? Answer: Consider two particles having momentum m1u1 and m2u2 colliding perfectly in-elastically to form single mass (m1 + m2) moving with velocity v. For kinetic energy to be com... read more

NEET - Grade 11 - Physics - Work, Energy and Power - Study ref# 325

Can mechanical energy be negative? What does negative energy signify? Give an example. Answer: As mechanical energy = Kinetic energy + Potential energyFor mechanical energy is negative, potential energy should be negative and magnitude will be g... read more

NEET - Grade 11 - Physics - Work, Energy and Power - Study ref# 326

Can a body have energy without having momentum and have momentum without having energy? Explain. Answer: I) Yes, a body at rest has no momentum. i.e., mv = 0; also K.E. =0. But it has potential energy. Therefore it possesses energy (K.E. + P.E.), wit... read more

NEET - Grade 11 - Physics - Work, Energy and Power - Study ref# 327

A body of mass ‘M’ at rest is struck by a body of mass ‘m’. Show that the fraction of K.E. of mass ’m’ transferred to the struck particle is 4mM(m+M)2. Answer:     K.E. of body stuck after collision Initial K.E.  &n... read more

NEET - Grade 11 - Physics - Work, Energy and Power - Study ref# 328

Show that, the total mechanical energy of a system is conserved if the forces, doing work on it, are conservative. Answer: Let m be the mass of the body held at A, at a height H above the ground.As the body is at rest at A, thereforeAt A: K.E. of ... read more

NEET - Grade 11 - Physics - Work, Energy and Power - Study ref# 329

State the work-energy theorem. Prove this theorem for a variable force. Answer: Work-Energy Theorem: according to this theorem, work done by net force in displacing a body is equal to the change in kinetic energy of the body.Proof: The time rat... read more

NEET - Grade 11 - Physics - Work, Energy and Power - Study ref# 330

What are conservative forces? Distinguish the conservative and non – conservative forces among the following: a) Gravitational force b) Frictional force c) Air resistance d) Electrostatic force Answer: Conservative forces those forces in which wor... read more

NEET - Grade 11 - Physics - Work, Energy and Power - Study ref# 331

Define Elastic and Inelastic collisions: Write their basic characteristics. Answer: Elastic collision: A collision in which there is absolutely no loss of kinetic energy is called elastic collision. Characteristics: i. The linear moment... read more

NEET - Grade 11 - Physics - Work, Energy and Power - Study ref# 332

A bullet is fired into a block of wood. If gets totally embedded in it and the system moves together as one entity, then state what happens to the initial kinetic energy and linear momentum of the bullet? Answer: Consider two particles A and B of mas... read more

NEET - Grade 11 - Physics - Work, Energy and Power - Study ref# 333

The force acting on a particle is given by F=a + bx Find the work done in displacing it from x = x1 to x2. Answer:        ... read more

NEET - Grade 11 - Physics - Work, Energy and Power - Study ref# 334

A pump on the ground floor of a building can pump up water to fill a tank of volume 30 m3 in 15 min. If the tank is 40 m above the ground and the efficiency of the pump is 30%, how much electric power is consumed by the pump? Answer: Volume of water ... read more

NEET - Grade 11 - Physics - Work, Energy and Power - Study ref# 335

Two particles A and B of masses m and 2m are moving along the X–axis and Y-axis respectively with the same speed v. They collide at the origin and coalesce into one body after the collision. What is the velocity of this coalesced mass? What is the lo... read more

NEET - Grade 11 - Physics - Work, Energy and Power - Study ref# 336

Write the Hook’s law of spring. Show that spring force is conservative in nature. Answer: Hook’s law of spring: For a small stretch or compression, spring obeys Hook’s law i.e. for a spring         &nbs... read more

NEET - Grade 11 - Physics - Work, Energy and Power - Study ref# 337

Show that, if a body of mass m moves with velocity u and collide elastically with another body of same mass at rest, then after collision the first body will come to rest. Answer: Initially, first body has velocity      ... read more

NEET - Grade 11 - Physics - Work, Energy and Power - Study ref# 338

Define coefficient of restitution. Show that, coefficient of restitution for perfectly inelastic collision is zero. Answer: It is defined as the ration between the relative velocities after collision and before the collision.where  are t... read more

NEET - Grade 11 - Physics - Work, Energy and Power - Study ref# 339

Write the properties of perfectly elastic collision and perfectly inelastic collision. Answer: Properties of perfectly elastic collision:i) Total linear momentum is conservedii) Total kinetic energy of the two bodies remains constantiii) Coef... read more

NEET - Grade 11 - Physics - Work, Energy and Power - Study ref# 340

The bridge over a small river is like an arc of a circle of radius 20 m. what will be the maximum speed of a car so that it does not lose contact with the bridge at highest point? Answer:  From figure N is the normal reaction by the bridge ... read more

NEET - Grade 11 - Physics - Work, Energy and Power - Study ref# 341

A wooden block of mass 10 kg is suspended by a long string. A bullet of mass 50 gm moving horizontally strikes the block and remains embedded into it. As a result the block swings and rises to a maximum height of 10 cm. what is the initial velocity o... read more

NEET - Grade 11 - Physics - Work, Energy and Power - Study ref# 342

A particle of mass m is moving in a horizontal circle of radius r under a centripetal force of  where k is a constant. What is the total energy of the particle? Answer: Let the particle of mass m is moving with a constant speed v along a ci... read more

NEET - Grade 11 - Physics - Work, Energy and Power - Study ref# 343

A car and a truck have same kinetic energy. Show whose momentum is greater? Answer: Momentum of truck is greater.Let m and v be the mass and velocity of the car and the corresponding quantities of the truck are M and V. by question  &n... read more

NEET - Grade 11 - Physics - Work, Energy and Power - Study ref# 344

Kinetic energy of a body increases by 21%. What is the percentage increase in linear momentum? Answer: Let m be the mass and  be the initial and final velocity of the body. initial K.E. = And final K.E. =  by questi... read more

NEET - Grade 11 - Physics - Work, Energy and Power - Study ref# 345

A uniform chain is placed on a horizontal table so that  of its length hangs below the table. If length and mass of the chain be L and M, calculate the work done to lift the hanging part on the table. Answer: Length of the hanging part is&n... read more

NEET - Grade 11 - Physics - Work, Energy and Power - Study ref# 346

What quantity we get from the slope of work-time graph? Answer: The slope of work-time graph denotes the instantaneous power of the machine which performs work.The slope of the graph is P =          &... read more

NEET - Grade 11 - Physics - Work, Energy and Power - Study ref# 347

Two blocks of mass M and 2M have equal momentum. What is the ratio of their kinetic energies? Answer: Let the velocities of the two blocks be Then by question,              &n... read more

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