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Revision of Motion and time

As we know that reading Whole chapter is become tough when the student has exam.So Learn Motion and time in short notes.

Rivision of Motion and time
By Rpstutor
  • One who takes the shortest time to cover the distance in 100 metre race has the highest speed
  • The  most convenient way to  find out which of the two or more objects is moving faster is, to compare their distance moved by them in a  unit time.
  • We call the distance covered by an object in a unit time as the speed of the object.
  • Formula of speed =total distance covered/total time taken.
  • If the speed of an object moving along straight  line keeps changing its motion is said to be the non uniform
  • An object moving along a straight line with constant speed is said to be in a uniform motion
  • One of the most well known periodic motion is a simple pendulum

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So Motion and time is not hard topic you can learn easily here.

Written by rpstutor contributor

Hubble telescope

There is many question arises when when we think of hubble telescope.so below is brief description of it in question and answer format.

Q1. In which orbit is it launch?

Ans:- Low Earth Orbit

Q2 when is it  launch?

Ans:- 24 april 1990

Q3:- what is use of it?

Ans:-Astronomer can see clear  views of the universe

Q4:-why it is different from other telescope?

Ans:-Because astronomer can see clear view in infrared and ultraviolet light.

Q5:-History of it?

in early 17th there is problem to see see view of universe.when Galileo was turning a spyglass to the heavens in 1609, he had found  trouble making out the rings of Saturn as it was visible in inexpensive telescopes . in advance optics improved scientists’ views of the planets and stars, but Earth’s atmosphere is  still blocked much of the light for observer that are looking from  ground by telescope. Larger telescopes were placed on high mountains, where atmospheres allow clearer pictures.

in 1923,scientist Hermann Oberth suggested that a telescope can be launch into orbit to help overcome the distortions caused by the atmosphere. As rocket launchings became more commonplace, the idea became feasible, and in 1969, approval was given for the launch of a Large Space Telescope. But its development took longer than preparing for a trip to the moon. and in  1993, the first new images from Hubble reached Earth.

Q6:-image of hubble telescope

hubble telescope image
image credit:NASA

 

Magnification

Now i will start with example then i will tell you what is magnification.so let’s start.

If we go to magic room of circus then we will see different mirror.if we look our face in that mirror then we will get different image means our face will look different.you can see image of this girl in mirror.

Magnification example
example of magnification

so now will see  magnification defination. if we talk about it then it will be different for different types of mirror.but its main core defination is below

Magnification is nothing but only ratio of the height of image  and the height of the object.In physics numerical problems it is represented by letter”m”.

now we will see formulae of “m” of different types of mirror.

  • spherical “m” .it is m=Height of the image/Height of the Object=h’/h. here h is the height of the object and h’ is the height of the image.
  • Now “m” produced by lens is also related to spherical “m”.so it is v/u we know it is related so h’/h=v/u

we can say that magnification means change virtual change in size of image and there is not limit for change in size of image,but it can be control by system resolving power. it’s concept  commonly used in microscope,increasing resolution and  telescope. increasing resolution is done by digital processor,microscope etc.

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Hope that this article clear the concept.

Written by Rakesh