Two waves interfere when they run into each other.
The barrier reflects waves that run straight into it. It acts as a wave source and sends wave pulses back up the page towards the incoming waves.
Imagine a loose string tied to a wall. Someone sends two consecutive pulses along the string towards the wall. The first pulse gets reflected right away. It will travel backward towards the person holding the string. Along its way, it will run into the second pulse. The two pulses will interfere. The wall will make the reflected pulse out of phase with the second one. They will end up creating a destructive interference.
So is the case with the water waves running into the barrier. The barrier will send incoming waves back toward where they came from. Reflected waves interfere with incoming ones.
If the billiard ball is going at the constant speed and contains its mass then the momentum WONT be changing. But realistically you have external forces like friction and air resistance changing the velocity thus changing the momentum. In this case momentum is not conserved because you're introduction an external force.
Answer:
Explanation:
Force constant of spring K = 21 N /m
we shall find the common velocity of putty-block system from law of conservation of momentum .
Initial momentum of putty
= 5.3 x 10⁻² x 8.97
= 47.54 x 10⁻² kg m/s
If common velocity after collision be V
47.54 x 10⁻² = ( 5.3x 10⁻² + .454) x V
V = .937 m/s
If x be compression on hitting the putty
1/2 k x² = 1/2 m V²
21 x² = ( 5.3x 10⁻² + .454) x .937²
x² = .0212
x = .1456 m
14.56 cm
The age of earth is b) 4.5 million years old
It is believed that earth is 4.5 million years old.
The radiometric age dating of earth meteorite content specifies the earth to be 4.5 million years old.
The formation of Earth is believed to have started shortly after the meteorites and nutrient inclusions were formed. It is challenging to differentiate between the ages of Earth and the oldest rocks since the duration of this accretion process is yet uncertain, and estimates from various accretion theories range from a few million with about 100 million years.
The oldest rocks on Earth that are visible at the surface are groupings of minerals, making it difficult to determine their exact age.
Due to the chemical makeup of rock minerals, some elements are found but not others; yet, in sedimentary deposits radioactive isotopes, the radioactive decay process over path to a successful strange elements.
Learn more about Earth here, brainly.com/question/12041467
#SPJ9
