Answer:
nebulas and they are the cool clouds in which stars form
Explanation:
The stars are born by chance. Fragments of matter are gathered from the cool clouds of gas and dust that float in space, the so-called nebulas. These particles are added by gravitational attraction to form a large mass.
This conglomerate, due to the effect of gravity, contracts on itself and as a consequence increases in its center, density, pressure and heat. In this way, atoms move faster and collide with each other. Under these conditions, nuclear fusion reactions soon begin. When they start the star is born.
Answer:
A body will become positively charged when some electrons will come out from the body.Thus, positive charge is due to deficiency of electrons.
Complete Question
The complete question is shown on the first uploaded image
Answer:
The velocity of the bus at B is 
Explanation:
Let's take position B as base point .
From the diagram height between point B and A ia mathematically evaluated as
From the question we are told that
The velocity at location A is 
According the law of conservation of energy
Where 
is the potential energy at A which is mathematically represented as
is the kinetic energy energy at A which is mathematically represented as
is the kinetic energy at A which is mathematically represented as
Where 
is the velocity at location B
So
Making the subject of the formula
Substituting values
Answer:
2.1 m/s²
Explanation:
By definition, the angular acceleration, is equal to the rate of change of the angular velocity, ω:
α = Δω / Δt (1)
By definition of the angular velocity, we can express the linear velocity, v, as follows:
v = ω*r⇒ Δv = Δω*r (2)
Replacing Δω, from (1) in (2), we get:
Δv = α*Δt*r⇒ Δv/Δt = α*r (3)
By definition of linear acceleration, we can write the following expression;
a = α*r
For a point on the edge of the wheel, the linear acceleration is tangent to the rim, and is equal to the product of the angular acceleration times the distance to the center, which for a point on the edge of the wheel, is just the radius:
⇒ a = 7 rad/sec²*0.3m = 2.1 m/s²
<span>2. An electric current in a conductor creates a magnetic field at all points in the surrounding region.
3. A permanent magnet creates a magnetic field at all points in the surrounding region.
4. A moving electric charge creates a magnetic field at all points in the surrounding region.</span>
