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A coolie X carrying a load on his head c...

A coolie X carrying a load on his head climbs up a slope and another coolie Y carrying the identical load on his head moves the same distance on a frictionless horizontal platform. Who does more work. Explain the reason

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To determine who does more work between coolie X climbing a slope and coolie Y moving on a horizontal platform, we can analyze the work done by each coolie step by step. ### Step 1: Understand the Concept of Work Work is defined as the product of force and displacement in the direction of the force. Mathematically, it can be expressed as: \[ \text{Work} = \text{Force} \times \text{Displacement} \times \cos(\theta) \] where \( \theta \) is the angle between the force and the direction of displacement. ### Step 2: Analyze Coolie X's Work ...
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Ram and Ali have been fast friends since childhood. Ali neglected studies and now has no means to earn money other than a channel whereas Ram has become an engineer. Now both are working in the same factory. Ali uses camel to transport the load within the factory. Due to low salary and degradation in health of camel, Ali becomes worried and meets his friend Ram and discusses his problems. Ram collected some data and with some assumptions concluded the following: i. The load used in each trip is 1000kg and has friction coefficient mu_k=0.1 and mu_s=0.2 . ii. Mass of camel is 500kg . iii. Load is accelerated for first 50m with constant acceleration, then it is pulled at a constant speed of 5ms^-1 for 2km and at last stopped with constant retardation in 50m . iv. From biological data, the rate of consumption of energy of camel can be expressed as P=18xx10^3v+10^4Js^-1 where P is the power and v is the velocity of the camel. After calculations on different issues, Ram suggested proper food, speed of camel, etc. to his friend. For the welfare of Ali, Ram wrote a letter to the management to increase his salary. (Assuming that the camel exerts a horizontal force on the load): The ratio of the energy consumed by the camel during uniform motion for the two cases when it moves with speed 5ms^-1 to the case when it moves with 10ms^-1

Graphical soluton of a two body head on collision A block A of mass m moving with a uniform velocity v_(0) strikes another identical block B kept at rest on a horizontal smooth surface as shown in the figure (i). We can conserve linear momentum. So mv_(0)=mv_(A)mv_(B) ( v_(A) and v_(B) are the velocities of the blocks after collision) :. v_(0)=v_(A)+v_(B) .........(i) If the collision is perfectly elastic 1/2 mv_(0)^(2)=1/2 mv_(A)^(2)+1/2 mv_(B)^(2) impliesv_(0)^(2)=v_(A)^(2)+v_(B)^(2) ......(ii) Both the above equation (i) and (ii) are plotted on v_(A)-v_(B) plane as shown in figure (ii). This plot can be used to find the unknowns v_(A) and v_(B) . For example the solution of the situation in figure (i) is v_(A)=0,v_(B)=v_(0) (point y in the plot) Because v_(A)=v_(0), v_(B)=0 (point x in the plot) is not physically possible. In a situation block A is moving with velocity 2m//s an strikes another identical block B kept at rest. The v_(A)-v_(B) plot for the situation is shown. m and l are the intersection points whose v_(A), v_(B) coordinaes are given in the figure. The coefficient of restitution of the collision is

Graphical soluton of a two body head on collision A block A of mass m moving with a uniform velocity v_(0) strikes another identical block B kept at rest on a horizontal smooth surface as shown in the figure (i). We can conserve linear momentum. So mv_(0)=mv_(A)mv_(B) ( v_(A) and v_(B) are the velocities of the blocks after collision) :. v_(0)=v_(A)+v_(B) .........(i) If the collision is perfectly elastic 1/2 mv_(0)^(2)=1/2 mv_(A)^(2)+1/2 mv_(B)^(2) impliesv_(0)^(2)=v_(A)^(2)+v_(B)^(2) ......(ii) Both the above equation (i) and (ii) are plotted on v_(A)-v_(B) plane as shown in figure (ii). This plot can be used to find the unknowns v_(A) and v_(B) . For example the solution of the situation in figure (i) is v_(A)=0,v_(B)=v_(0) (point y in the plot) Because v_(A)=v_(0), v_(B)=0 (point x in the plot) is not physically possible. If the collision is perfectly inelastic, then the v_(A)-v_(B) plot is

ICSE- WORK ENERGY AND POWER-EXERCISE-2(A)
  1. A satellite revolves around a planet in a circular orbit. What is the ...

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

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

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

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

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

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

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  8. Express joule in terms of erg

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

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

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

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

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

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

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

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

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  17. Differentiate between work and power.

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  18. Differentiate between energy and power

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

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

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