Ans: As the ball is dropped from certain height "h" onto the floor having initial potential energy P.E.= mgh
and keeps bouncing. It is observed after each bounce its height and its P.E are decreasing. And time period is also decreasing. As time period is not constant and total energy is not conserved so the motion of ball is not simple harmonic motion.
kindly can u solve one numerical?
ReplyDeletea person observes a firework display from a safe distance of 0.850km .assuming that sound travels 340ms-1 in air.what is the time between the person seeing and hearing a fireworks explosion?
Distance= 0.850km=850m
DeleteSpeed of light= 3.00×108 m/s
Speed of sound in air= 340ms-1
Formula
S=vt
Now
A) t =S/v=850/3.00×108 =0.00000283333s
B) t =S/t=850/340 =2.5s
Time difference= 2.5-0.00000283333=2.4999
Sir please give me the answer of this question:
ReplyDelete"Suppose you and your friend are on the moon. Will you be able to hear any sound produced by your friend.
No because sound travels via a medium and there on moon no medium is present so,soundwaves can't travel there
DeleteNO AS SOUND WAVES ARE A MECHANICAL WAVES , WHICH REQUIRE MEDIUM FOR THEIR PROPAGATION.
ReplyDeleteTHUS NO ATMOSPHERE ON MOON WE CANNOT HEAR, ALTHOUGH SOME HOW IF SOUND TRAVEL THROUGH HIS BODY AND AND MOON SURFACE THEN YOU COULD HEAR.
Nice
ReplyDeleteSir what are the condition to execute simple hormonic motion?... I can't find many qualitive reasons
ReplyDeleteBasic conditions to execute simple harmonic motion are: (i) There must be an elastic restoring force acting on the system, (ii) the system must have inertia, and (iii) the acceleration of the system should be directly proportional to its displacement and is always directed to mean position.
Delete