Answer:
Climate change, where there is an increase in the average temperature, due to continuous human activities. These activities increase greenhouse gases in the atmosphere.
Explanation:
Alaska is the largest state in the United States, and it has a cold climate. The climate changed over time as human activities such as coal mining contributed to greenhouse gas emissions leading to global warming. Over the years. the variations in weather leading to climate change melt the permafrost (frozen ground below the soil surface) causing ocean waves to erode the land and destroy property.
<u>Answer:</u>
<em>Newtons II law: </em>
<em> </em>It is defined as<em> "the net force acting on the object is a product of mass and acceleration of the body"</em> . Also it defines that the <em>"acceleration of an object is dependent on net force and mass of the body".</em>
Let us assume that,a string is attached to the cart, which passes over a pulley along the track. At another end of the string a weight is attached which hangs over the pulley. The hanging weight provides tension in the spring, and it helps in accelerating the cart. We assume that the string is massless and no friction between pulley and the string.
Whenever the hanging weight moves downwards, the cart will accelerate to right side.
<em>For the hanging weight/mass</em>
When hanging weight of mass is m₁ and accelerate due to gravitational force g.
Therefore we can write F = m₁ .g
and the tension acts in upward direction T (negetive)
Now, Fnet = m₁ .g - T
= m₁.a
So From Newtons II law<em> F = m.a</em>
Answer:
Explanation:
The first thing to have to make a diagram where we indicate the forces acting on the block, see attached. We have the following
The weight (W) that is vertical
The friction force (fr) that opposes the movement
The driving force (F)
The normal (N) which is the reaction to the support of the body and is perpendicular to the surface
We write a reference system where one axis is parallel to the surface (x axis) and the other is perpendicular to it (Y axis) we decompose the forces on these axes, we see that the only force we have to decompose r is the weight
sin θ = Wx / W ⇒ Wx = W sin θ
cos θ = Xy / W ⇒ Wy = Wcos θ
We write Newton's equations for each axis
N- Wy = 0
F -fr -Wx = m a (1)
The expression for the friction force is
fr = μ N
N = Wy
N = W cos θ
fr = μ mg cosT
We hope, we simplify the acceleration of equation 1
a = F - μ mg cos θ -mg sinθ
a = F - mg (μ cos θ -sin θ)
This is the general equation for movement.
