A rocket moves upward from rest with an acceleration of 40 m/s2 for 5 seconds. It then runs out of fuel and continues to move up
1 answer:
Answer:
Maximum height of rocket = 2538.74 m
Explanation:
We have equation of motion s = ut + 0.5 at²
For first 5 seconds
s = 0 x 5 + 0.5 x 40 x 5² = 500 m
Now let us find out time after 5 seconds rocket move upward.
We have the equation of motion v = u + at
After 5 seconds velocity of rocket
v = 0 + 40 x 5 = 200 m/s
After 5 seconds the velocity reduces 9.8m/s per second due to gravity.
Time of flying after 5 seconds
Distance traveled in this 20.38 s
s = 200 x 20.38 - 0.5 x 9.81 x 20.38² = 2038.74 m
Maximum height of rocket = 500 +2038.74 = 2538.74 m
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Answer:
The current in the coil is 60 Ampere.
Explanation:
Given:
Number of turns in the coil is N = 25
Dimension of the coil = 15cm X 12cm
magnitude of magnetic field = 0.20T
angle in the xy plane is θ = 0 degree
torque τ = 5.4 N-m
To find:
current in the coil is i = ?
Solution:
The torque acting on the coil is given by
=>
Converting cm to m
12 cm = 0.12 m
15 cm = 0.15 m
The area of the coil is
A = 0.12 X 0.15
A =
Substituting the values
=>
=>
=>
=>
=>
=>
=> i = 60 A
<h2>Answer: 1.73</h2>
Explanation:
The situation described here is known as polarization by reflection. This was discovered by Scottish physicist David Brewster and then formulated the law that bears his name:
<em>"When a beam of light hits the surface that separates two non-conducting media characterized by different electromagnetic characteristics (electrical permittivity and magnetic permeability), part of it is reflected back to the source medium, and part is transmitted to the second medium."</em>
This polarization happens when the light incides at a specific angle, called the Brewster angle (), which is given by the following formula (<u>taking into account that generally the magnetic permeabilities of the two media involved do not vary):</u>
(1)
Where is the index of refraction of the second medium (the varnish in this case) and
is the index of refraction of the first medium (the air).
Now, if we are told the angle between the incident and reflected rays is , this means the incident angle is the half (
), which is the Brewster angle in this case.
So, (2)
Rewriting (1) with this incident ray angle:
(3)
Finally we obtain the index ofrefraction of the varnish: