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.
Auroras and northern lights can be seen within the ionosphere. This is the range where cosmic and the sun's radiation are ionized.
answers
velocity = 7 m/s
tension = 7.644 N
set up equation for velocity
because energy is conserved, the change in potential energy as the potato drops is the same as the change in kinetic energy
U = K
mgh = m/2
gh = /2
= 2gh
v =
values
g = 9.8 m/s^2
h = 2.5 m (change in vertical distance)
plug in values and solve
v =
v =
v = 7 m/s
set up equation for tension
at the lowest point, tension (directly upward) acts in the opposite direction of weight (directly downwards) so
∑F = T - mg
since the potato is in circular motion, the net force is equal to centripetal force
∑F = m/r
∑F = T - mg = m/r
T - mg = m/r
T = mg + m/r
T =
values
m = 0.26 kg
g = 9.8 m/s^2
v = 7 m/s
r = 2.5m
plug in values and solve
T =
T =
T = 7.644 N
Answer:
22.3 N
Explanation:
The centripetal force acting on a the rock is given by:
where
m = 3.0 kg is the mass of the rock
v is the speed of the rock
r = 0.75 m is the radius of the trajectory
We need to find the speed of the rock. We know that the rock makes a complete circle in t = 2.0 s, and the radius of the circle is r = 0.75, so the speed is equal to the ratio between the distance covered (the perimeter of the circle) and the time taken:
And so, the centripetal force is
Answer: A. AB + C → AC + B
Explanation:
A single displacement reaction is also known as single replacement reaction. A reaction in which an element replaces another element from the compound is known as single displacement reaction.
AB + C → AC + B
Here, element C replaces another element B from compound AB.
Thus, option A represents is a general equation for a single displacement reaction
Option B represents a double displacement reaction where one element of a compound replaces another element of another compound and vice-versa, option C is a synthesis reaction where two reactants or more combine to form one product. Option D is a decomposition reaction in which multiple products are formed from a single reactant.