Answer
given,
angular speed of the tub = 5 rev/s
time = 9 s
he tub slows to rest = 15.0 s
the angular acceleration
angular displacement
case 2
now,
time = 15 s
the angular acceleration
angular displacement
total revolution in 24 s
= 23 + 38
= 62 revolution
The light waves bend as it travels from the air into the water.
This phenomenon is called refraction of light waves.
Answer:
Pangaea
Explanation:
The Earth's crust is not one solid block but is made of different segments called tectonic plates. At one point it started to break apart. The land mass was present around the Paleozoic and Mesozoic eras. This land mass was called Pangaea
As a result all the water on Earth was a part of an ocean called Panthalassa. The concept of the one land mass and one water mass was proposed be Alfred Wagner.
Hence, the statement here is referring to Pangaea.
Explanation:
Bragg's law is given by :
Where
d is the lattice spacing
n is the order
is the wavelength of x- ray
is the diffraction angle.
Diffraction angle is defined as the angle between incident beam and the reflecting planes of atom. Hence, the correct option is (b).