The value of restitution coefficient e for perfectly elastic collision is:
- ✓1
- B$0$
- C$\infty$
- D-1
Answer: A.
View full solution →Question types
PART - 1 CH - 5Work, Energy and Power question types
118 questions across 8 question groups — pick any mix to generate a Physics paper with step-by-step answer keys.
118
Questions
8
Question groups
5
Question types
01
M.C.Q (1 Marks)
18 Q→02Fill In The Blanks[1 Marks ]
10 Q→031 Marks Question
40 Q→042 Marks Questions
19 Q→053 Marks Question
4 Q→065 Marks Questions
16 Q→07True False[1 Marks ]
9 Q→08Match the following.
2 Q→Sample Questions
PART - 1 CH - 5Work, Energy and Power questions
One sample from each question group in this chapter. Select any group above to see the full set with answer keys.
If $\overrightarrow{ F }=(20 \hat{i}+15 \hat{j}-5 \hat{k})$ and $\overrightarrow{ v }=(6 \hat{i}-4 \hat{j}+3 \hat{k}) m / s$ then the instantaneous power will be :
- A35 W
- B25 W
- C90 W
- ✓45 W
Answer: D.
View full solution →A person carries a weight on his head for distance r. He has to do maximum work. When he takes the object:
- AMoves on a rough horizontal surface
- BMoves on a smooth horizontal surface
- ✓Moves up on a vertical plane
- DWalks on an inclined plane.
Answer: C.
View full solution →Work done on an object does not depend
- ✓On the initial speed of the object
- BAt the angle between force and displacement
- COn displacement
- DOn applied force
Answer: A.
View full solution →If by applying a force F on an object that object gets velocity v then the value of power will be :
- Av/F
- BFv2
- ✓Fv
- DF/v2
Answer: C.
View full solution →The relative speed of coming closer before the collison and the relative speed of moving away after the collision will be ...............
For partially elastic collision ...............
1 horse power = ............... Watt
According to Albert Einstein, energy and mass are equivalent quantities. That means E =...............
In the presence of conservative forces, mechanical energy of isolated system remains. ...............
A shell is fired from a cannon and it explodes at the top. What will be the change in its momentum and kinetic energy?
The velocity of an airplane is tripled. what will be the momentum? Will momentum be conserved?
Is the complete kinetic energy dissipated in a perfectly elastic collision?
Write the name of that parameter of elasticity of an object which is called its measurement degree
When is the energy exchange maximum in an elastic collision?
A sphere collides with another stationary sphere of equal mass. If the coefficient of resitution is $e$ then what will be the ratio of velocities of the spheres after the collision?
View full solution →A horse, applying a force of 40 N at an angle of $60^{\circ}$ to the horizontal to pull a cart tied behind it with velocity of $7.2 km / h$. Then, (i) how much total work did this horse do in 10 minutes (ii) what is the power of horse?
View full solution →A spring whose force constant is $k$ obeys Hooke's is law 4 J of work is required by pulling it to a length of 10 cm from the original length. Calculate :(i) Value of k
(ii) Additional work required to stretch the spring by additional 10 cm length.
View full solution →(ii) Additional work required to stretch the spring by additional 10 cm length.
A tube well pump throws up 2400 kg of water in every mintue. If the speed of water coming out is $3 m / s$ then find the power of the pump. If the pump runs for 5 hours then find the value of work done by the pump.
View full solution →The relation between the position and time of a particle under the influence of constant force is $x$ $=(t-4)^2$, where $x$ is in meters and $t$ is in seconds. Then calculate the work done by force in the first 8 seconds.
View full solution →In an ideal spring the law $\vec{F}=-k \vec{x}$ is followed. Here $k$ is the spring constant. Calculate the work done by the spring in stretching it to a distance $x$ from its equilibrium position by integral method and graphical method
View full solution →Prove that as the object moves towards the ground from some height, its potential energy decreases and kinetic energy increases by the same amount.
Write the main characteristics of potential energy
What is work and also give examples of the following :(i) Zero work(ii) Positive work(iii) Negative work
If an object of mass $M$ moving with velocity $\mu$ has a direct elastic collision with an other stable object of mass $m$ then prove that the energy loss of the object of mass $M$ and the result of its intial energy will be $\frac{4 m M }{( M +m)^2}$
View full solution →Two objects of masses $m_1$ and $m_2$ are moving with velocities $u_1$ and $u_2$ respectively collide in an inelastic collision. If after the collision both the objects move together then calculate the change in the value of energy
View full solution →Prove that after a direct elastic collision between two balls of equal mass, their velocities mutually interchange.
Explain by making a labelled diagram of two dimensional collision or oblique collision.
Explain inelastic collision and prove that kinetic energy is not conserved in inelastic collision. Or Prove that in inelstic collision, kinetic energy is not conserved rather energy is lost.
If the velocity of an object is doubled. Its kinetic energy will also be doubled.
The work done doesn't depend on initial speed of the body.![]()
Potential energy is conserved in both elastic and inelastic collision.
For simple linear or one-dimensional elastic collision,$u_1-u_2=-\left(v_2-v_1\right)$
View full solution →The work done by the force is zero for a body which voluntarily returns to its initial position in such a closed path.
| Column - A | Column – B |
| 1. Friction forces and viscous forces are | (A) Electrical energy |
| 2. The value of mathematical equaivalent of heat is | (B) $\frac{1}{2} I \omega^2$ |
| 3. Transformation of chemical energy takes place in a dry cell | (C) Non-conservative force |
| 4. The value of rotational kinetic energy of the body is | (D) Newton/meter |
| 5. The unit of spring constant 1S | (E) 4.2 J/calorie |
| Column - A | Column – B |
| 1. $\hat{i} \cdot \hat{j}=\hat{j} \cdot \hat{k}=\hat{k} \cdot \hat{i}=$ | (A) 1 |
| 2. $|\hat{i}|=|\hat{j}|=|\hat{k}|$ | (B) Proportional |
| 3. $(3 \hat{i}+4 \hat{j}-5 \hat{k})$. $(5 \hat{i}+4 \hat{j}+3 \hat{k})=$ | (C) 0(ZERO) |
| 4. Work done by the force acting perpendicular to the displacement is always | (D) 16 |
| 5. Work done (w) and heat generated (H) on a system are mutual | (E) Zero |
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