## A body is dropped from a tower of height 96 m. Another body is thrown up from the ground after a second with a velocity of 40 m/s.When and where they will meet?

A body is dropped from a tower of height 96 m. Another body is thrown up from the ground after a second with a velocity of 40 m/s. When and where they will meet? SOUNDARYA asked  Answer: For the first body, u=0 m/s Let S=x (from top) x=0.5 gt2  &#...

## The SI & CGS unit of time is same .Why?

Almost in all systems of unit second is the unit of time, most probably because, second is the most convenient one, if we look at the guidelines for selecting a unit. For more details refer to the following links http://www.aticourses.com/international_system_units.htm http://www.french-metrology.com/en/history/history-mesurement.asp http://physics.nist.gov/cuu/Units/history.html http://en.wikipedia.org/wiki/Metric_system http://en.wikipedia.org/wiki/Systems_of_measurement Incoming search terms:cgs unit for timeThe SI & CGS unit of [...]

## Frequency of sound and loudness

What is meant by frequency? Does the loudness of sound increase with frequency? ( Thiruveni Nainar asked this question) Answer: As you know, sound is produced by the vibrations of the sounding body. Frequency of the sound produced by the vibrations of a body is same as the frequency with which the body vibrates, i.e; the no. of [...]

## why in all the system of units time is always in second?

Please tell me why in all the system of units time is always in second? -Pankaj Sharma Incoming search terms:system unit

## A numerical problem from Beats

1. “A source of sound frequency 256Hz is moving rapidly towards a wall with a velocity of 5m/s. How many beats per second will be heard if sound travels at a speed of 330m/s?”
2. a

## Antimatter atoms have been trapped for the first time ?!

Researchers at Cern, home of the Large Hadron Collider, have held 38 antihydrogen atoms in place, each for a fraction of a second.

Antihydrogen has been produced before but it was instantly destroyed