Answer:
Glassy texture
Explanation:
The rocks that are characterized by the absence of structure, shape, and size are usually referred to as the glassy texture. These rocks are comprised of atoms that are randomly oriented. These rocks are lacking in crystals because of their faster rate of cooling. It cools so fast that it does not get a sufficient amount of time to form crystals. For example, Obsidian.
This glassy textured rocks are found in the igneous types of rocks that are formed due to the cooling of magma.
The scientist that contributed to the declassification of Pluto as a planet is Mike Brown.
Answer:
a)
b)N= 21.29 rpm
Explanation:
Given that
Mass of the ball =m
Length of string = L
Lets take angular speed = ω
The centripetal force on the ball
F = m ω² L
To complete the circle ,at the top condition the force due to gravity should be equal to the centripetal force
Gravity force = mg
F= mg
m ω² L = m g
ω² L = g
When L= 2 m
Lets take g =10 m/s²
ω = 2.23 rad/s
To convert in rpm
N=Speed in rpm
N= 21.29 rpm
Answer:
A magnetic tape is being played on a cassette deck. The tension in the tape applies a torque to supply reel. Assuming the tension remains constant during playback, the torque varies as the reel becomes empty because the lever arm gets smaller. Therefore, the torque exerted on the reel by the tape becomes smaller.
Explanation:
Inertia increases and the angular momentum is to remain the constant.
Torque =rFsinФ
r=radius
F=force
Ф=angle between the F and lever arm
Answer:
4N downward
Explanation:
the 16N left and right cancel each other out, so you are left with the 4N downward.
