A front is defined as a "boundary" that separates two masses of different air densities. I am not entirely sure, but I think the answers are either C or D, but I'm mostly convinced it's option D.
Answer:
7.8 N
Explanation:
Applying,
I = Ft................. Eqaution 1
Where I = Impulse on the egg test dummy, F = Force on the egg test dummy during the time interval, t = time interval
make F the subject of the equation
F = I/t.................. Equation 2
From the question,
Given: T = -0.39 N.s, t = 0.050 s
Substitute these vales into equation 2
F = -0.39/0.050
F = -7.8 N
Hence the force that act on the egg test dummy is 7.8 N
Answer:
The amount of work must be do to rotate the bar magnet is 151.2 J
Explanation:
Given:
Magnetic moment

Magnetic field
T
To find work do to rotate the bar magnet,
From the formula of work done in case of magnetic field,

Here
changes 0 to 180
But 


J
Therefore, the amount of work must be do to rotate the bar magnet is 151.2 J
Answer:
C). Refraction
Explanation:
When light enters from one medium to another medium then it changes it's direction from its initial direction
the phenomenon of changing the direction due to change in the medium is known as Refraction of light
So here we know that when light strikes an interface which separates two medium then due to change in the medium we will have

so here we have
= two angles of the light in two mediums
= two refractive index of the two mediums
So correct answer will be
C). Refraction