Subrat Sir - TTRC Rayagada

Q.26) Differentiate between energy and power.

Q.27) State and define the SI unit of power.

Q.28) (a) Name the physical quantity measured in terms of horsepower.

(b) How is horse power related to the SI unit of power ?

Q.29) Differentiate between watt and watt hour.

Q.30) Name the quantity which is measred in (a) kWh (b) kW (c) Wh (d) eV

Q.21) Name the physical quantity which is measured in calorie. How is it related to the SI unit of that quantity?

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Q.22) Define kilowatt hour. How is it related to joule?

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Q.23) Define the term power. State its SI unit.

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Q.24) State two factors on which power spent by a source depends. Explain your answer with example.

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Q.25) Differentiate between work and power.

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Q.16) A body of mass m falls down through a height h. Obtain an expression for the work done by the force of gravity.

Q.17) A body of mass m climbs up the stairs of vertical height h.

(a) What is the work done by the body against the force of gravity ?

(b) What would have been the work done if he uses a life in climbing the same vertical height?

Q.18) Define the term energy and state its SI unit.

Q.19) What physical quantity does the electron volt (eV) measure? How is it related to the SI unit of that quantity?

Q.20) Complete the following sentences :

(a) 1 J = __________ calories.

(b) 1 kWh = __________ J

Ans : (a) 0.24   (b) 3.6 X 10^16

13) What are SI and CGS units of work ? How are they related? Establish the relationship.

14) State and define the SI unit of work.

15) Express Joule in terms of erg.

7) When a body moves in a circular path, How much work in done by the body? Give Reason.

8) A Satellite revolves around the earth in a circular orbit. What is the work done by the satellite ? Give reason.

9) State whether work is done or not by writing yes or no, in the 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.

10) 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.

EXERCISE 2(A)

Q.1) Define work. When work is said to be done by a force ?

Q.2) How is the work done by a force measured when (i) force is in direction of displacement (ii) force is at an angle to the direction of displacement ?

Q.3) A force F acts on a body and displaces it by a distance S in a direction at an angle thita with the direction of force. (a) write the expression for the work done by the force. (b) what should be the angle between the force and displacement to get (i) zero, (ii) maximum, work ?

Q.4) A body is acted upon by a force. State two conditions when the work done is zero.

Q.5) State the condition when the work done by a force is (a) positive (b) negative. Explain with the help of examples.

Most of the time people are getting confused on what the processor and RAM really do. What is more Important. Today we will discuss about this topic.

First we will discuss what RAM actually does in Smartphones or Computers. RAM is the place where running programs are stored. RAM (Random-Access Memory) is the memory used to store open programs (apps) so that it can be easily accessed by the processor. For example, a user launched the Gallery and then after a while he hit the home button and proceed to Another Game. The Gallery, which was still running was stored in the RAM. That way, when the user decides to go back to what he was doing, he will be able to continue his activity without needing to restart the app. In short, it is needed in running heavy apps and multitasking. So in this case he is able to launch the app soon because it was already running in the background. If you have more RAM then you can do multitasking in a better way.

The processor is the one processing the inputs received by the computer or smartphone. From a technical point of view, the RAM itself doesn’t have anything to influence the performance of the processor. Meaning, the RAM cannot boost the processing speed of the processor but it has something to do on how fast the overall performance will be. Why? Because it’s the place where running programs are stored. RAM (Random-Access Memory) is the memory used to store open programs (apps) so that it can be easily accessed by the processor. In short, it is needed in running heavy apps and multitasking.

The processor is the one processing the inputs received by the smartphone. If the device has a 1GHz processor, then it might be fast enough but if it will be accompanied with a low RAM and you’ll use it for heavy multitasking or a resource hog game or app, then the “lag” kicks in. The process is slowed down because when the RAM is full, the rendering starts to suffer. That’s the time when that you’ll notice the slowness of an app.

Basically, the processor is the engine that works its way and it utilizes the resources it has. Thus, the amount of RAM directly affects the performance of a device. On the other hand, a slow processor with a huge 2GB of RAM will also not work out just right. It should be a sweet combination of the two.

So Higher RAM will help you to run multiple apps together. Higher processing speed gives you FASTER results.

Thus, as the question asks, one cannot determine what is more important, processor or RAM. Both are important and It is better if they are in a good proportion.

 For Details please watch the youtube video: