Home
Class 10
PHYSICS
State whether work is done or not ,by wr...

State whether work is done or not ,by writing yes or no,in following cases:
(a) A man pushes a wall
(b)A coolie stands with a box on his head for 15 min.
(c )A boy climbs up 20 stairs.

Text Solution

Verified by Experts

(a)No (b)No (c )Yes
Promotional Banner

Topper's Solved these Questions

  • WORK ENERGY AND POWER

    ICSE|Exercise EXERCISE-2(A) (MULTIPLE CHOICE TYPE )|2 Videos

  • WORK ENERGY AND POWER

    ICSE|Exercise EXERCISE-2(A) (NUMERICALS)|16 Videos

  • WORK ENERGY AND POWER

    ICSE|Exercise EXERCISE-2(C ) NUMERICALS|6 Videos

  • CALORIMETRY

    ICSE|Exercise EXERCISE-11(B) (NUMERICALS)|15 Videos

Similar Questions

Explore conceptually related problems

When is the work done in the following situation: (i) A boy pushing a wall (ii) A girl carrying a school bag on her shoulders (iii) A stone falling freely (iv) A boy climbing up the stairs.

A block of mass M hanging over a smooth and light pulley through a light string. The other end of the string is pulled by a constant force F. The kinetic of the block increases by 40J in 1s . State whether the following statements are true or false. (a) The tension in the string is Mg . (b) The work done the tension on the block is 40J . (c) the tension in the string is F . (d) The work done by the force of gravity is 40J in the above 1s .

State whether the following statements are true or false by writing T/F against them. (a) Earth moves around Sun with a uniform velocity. (b) The motion of moon around Earth in a circular path is an accelerated motion. ( c) A uniform linear motion is unaccelerated, while a uniform circular motion is an accelerated motion. (d) In a uniform circular motion, the speed continuously changes because the direction of motion changes. (e) A boy experiences a centrifugal force on his hand when he rotates a piece of stone tied at one end of a string. holding the other end in the hand.

A boy of mass m climbs up the stairs of vertical height h. (a) What is the work done by the boy against the force of gravity ? (b) What would have been the work done if he uses a lift in climbing the same vertical height ?

A gas in a cyclinder is held at a constant pressure of 2.30xx10^5 Pa and is cooled and compressed from 1.70m^3 to 1.20m^3 . The internal energy of the gas decreases by 1.40xx10^5J . (a) Find the work done by the gas. (b) Find the absolute value |Q| of the heat flow into or out of the gas and state the direction of the heat flow. (c) Does it matter whether or not the gas is ideal? Why or why not?

A gas in a cylinder is held at a constant pressure of 1.7xx10^5 Pa and is cooled and compressed from 1.20m^3 to 0.8m^3 . The internal energy of the gas decreases by 1.1xx10^5J . (a) Find the work done by the gas. (b) Find the magnitude of the heat flow into or out of the gas and state the direction of heat flow. (c) Does it matter whether or not the gas is ideal?

AB is a quarter of smooth circular track of radius R=6m . A particle P of mass 0.5kg moves along the track from A to B under the action of the following forces. a. A force F_1 directed always towards the point B, its magnitude is constant and is equal to 20N . b. A force F_2 directed along the instantaneous tangent to the circular track, its magnitude is (15-10S)N , where S is the distance travelled in metre. c. A horizontal force of magnitude 30N . Find the work done by forces mentioned in (a), (b) and (c)

These questions consists of two statements each printed as Assertion and Reason. While answering these question you are required to choose any one of the following five reponses (a) If both Assertion and Reason arecorrect and Reason is the correct explanation of Asserrtion. (b) If both Assertion and Reason are correct but Reason is not the correct explanation of Assertion. (c ) If Assertion is true but Reason is false. (d) If Assertion is false but Reason is true. Assertion Consider a person of mass 80 kg who is climbing a ladder. In climbing up a vertical distance of 5 m, the contact force exerted by ladder on person's feet does 4000 J of work. [Consider g=10 ms^(-2) ] Reason Work done by a force F is defined as the dot product of force with the displacement of point of application of force.

ICSE- WORK ENERGY AND POWER-EXERCISE-2(A)
  1. When a body moves in a circular path ,how much work is done body?Give ...

    Text Solution

    |

  2. A satellite revolves around a planet in a circular orbit. What is the ...

    Text Solution

    |

  3. State whether work is done or not ,by writing yes or no,in following c...

    Text Solution

    |

  4. A coolie X carrying a load on his head climbs up a slope and another c...

    Text Solution

    |

  5. The work done by a fielder when he takes a catch in a cricket match is...

    Text Solution

    |

  6. Give an example when work done by the force of gravity acting on a bo...

    Text Solution

    |

  7. What are the S.I. and C.G.S units of work? How are they related ? Esta...

    Text Solution

    |

  8. State and define the S.I. unit of work.

    Text Solution

    |

  9. Express joule in terms of erg

    Text Solution

    |

  10. A body of mass m falls down through a height h. Obtain an expression f...

    Text Solution

    |

  11. A boy of mass m climbs up the stairs of vertical height h. (a) What is...

    Text Solution

    |

  12. Define the term energy and state its S.I. unit

    Text Solution

    |

  13. What physical quantity does the electron volt (eV) measure? How is it ...

    Text Solution

    |

  14. Complete the following sentences : (a) 1J= …………ealorie . (b) 1 kWh …...

    Text Solution

    |

  15. Name the physical quantity which is measured in calorie.How is it rela...

    Text Solution

    |

  16. Define kilowatt hour.How is it reltated to joule?

    Text Solution

    |

  17. State two factors on which power spent by a source depends.Explain you...

    Text Solution

    |

  18. Differentiate between work and power.

    Text Solution

    |

  19. Differentiate between energy and power

    Text Solution

    |

  20. State and define the S.I unit of power.

    Text Solution

    |