Answer:
Explanation:
Given
Density of Cork 
Considering V be the volume of Cork
Buoyant Force will be acting Upward and Weight is acting Downward along with T
Since density of water is more than cork therefore Cork will try to escape out of water but due to tension it will not
we can write as
where T=tension
Thus Tension T is
Taking 
common
<span>The
answer is towards <span>the poles. This is because, at
the poles of the magnet, the magnetic field lines get closer together hence
indicating that the magnetic force is stronger here. The fields are closest
together at the center of the magnet and farthest at the outside side of the
magnet. </span></span>
As the speed of wave decreases, the wavelength of the wave decreases.
<h3>Refraction</h3>
We know that as a wave travels from one medium to another its speed decreases depending on if the first medium is less dense than the second medium or increases depending on if the first medium is more dense than the second medium. This is known as refraction
Now, we know that the speed of a wave v = fλ where
- f = frequency and
- λ = wavelength. Since f is constant, v ∝ λ.
The ratio of the speed in medium one to speed in medium two is called the refractive index of medium 1 to 2.
<h3>Explaining the diagram</h3>
From the diagram, we see that the wavelength in medium 1 is longer than that in medium 2. Since wavelength and speed are proportional, so the speed in medium 1 is also greater than the speed in medium 2.
So, As the speed of wave decreases, the wavelength of the wave decreases.
Learn more about refraction here:
brainly.com/question/25758484
Answer:
Assume that 
. The net force on this object will be 
(downwards.) The acceleration of this object will be approximately 
(also downwards.)
Explanation:
<h3>Net force</h3>
The object is falling towards the ground because of gravity. The size of the gravitational force on this object depends on its mass and the strength of the gravitational field at its location.
Near the surface of the earth, the gravitational field strength is approximately 
. In other words, approximately 
of gravitational force acts on each kilogram of mass near the surface of the earth.
The mass of this object is given as 
. Therefore, the size of the gravitational force on it will be:
.
Near the surface of the earth, gravitational forces point towards the ground. On the other hand, the direction of air resistance on this object will be opposite to its direction of motion. Since this objects is moving towards the ground, the air resistance on it will be directed in the opposite direction. That's exactly the opposite of the direction of the gravitational force on this object. The net force on this object will be:
.
<h3>Acceleration</h3>
Let 
denote the acceleration on this object. Apply Newton's Second Law of motion:
.
Note that the acceleration of this object and the net force on it should be in the same direction.
