The elastic potential energy stored in the spring is
= (1/2) x (spring constant) x (distance stretched or compressed)²
If all four springs are stretched or compressed the SAME distance
from their equilibria, then the potential energy is just proportional
to the spring constant.
From greatest to least stored energy is exactly the same list as
from greatest to least spring constant:
X . . . . . 35
W . . . . . 24
Y . . . . . 22
Z . . . . . 15
Echo means repetition of sound..If someone is speaking there will be two sounds..one which he is speaking right now and the other sound which he/she spoke earlier ..this will lead to confusion..in big halls the distance would be more than 17 m between the walls which will cause echo and not reverberation(prolongation of sound)
Hope this helps!
The Solar System moves through the galaxy with about a 60° angle between the galactic plane and the planetary orbital plane. The Sun appears to move up-and-down and in-and-out with respect to the rest of the galaxy as it revolves around the Milky Way and
This speed is not unusual for the stars around us and is our “milling around” speed in our suburban part of the Galaxy. In addition to the individual motions of the stars within it, the entire Galaxy is in spinning motion like an enormous pinwheel.
Here in this case we can say that there is no external force on skate board and boy as a system
so here we will use the theory of momentum conservation
So we will say
initial momentum of boy + board = final momentum of boy + board
so here the skateboard will move off in opposite direction with speed 1.35 m/s
Answer: I think 1 is 300 metres per second.
Explanation: wave speed= wave length x wave frequency
wave speed = 3 x 100
wave speed is 300 m/s