Answer:
53.06°
Explanation:
refractive index of air = 1
refractive index of water, n = 1.33
Let the angle of polarisation is ip.
Use Brewster's law,
n = tan ip
1.33 = tan ip
ip = 53.06°
thus, the angle of polarisation is 53.06°.
... The top branch of the 3-branched parallel block ... the 9 and 6 in series ...
is equivalent to a single resistor of 15 ohms.
... The 3-branched parallel block boils down to (30, 10, and 15) in parallel.
That's (1/30 + 1/10 + 1/15)⁻¹ = 5 ohms.
... The 5-ohm-equivalent block and the 20-ohm resistor form a
voltage divider across the battery.
The voltage across the 5-ohm-equivalent block is (5/25 x 30v) = 6v .
... The top branch of the block is equivalent to a (9 + 6) = 15-ohmer.
With 6v across its ends, the current through that branch is (6/15) = 0.4A .
... With 0.4A flowing through it, the 9-ohm resistor is dissipating
I²R = (0.4A)² (9 ohms) = (0.16 A²) (9 ohms) = 1.44 W (choice-3)
Answer:
I dont. understand the question, maybe insert the picture?
The change of the copper temperature if a 0.6g piece of copper is heated and fashioned into a bracelet with 62,100 J amount of energy transferred is 265.4°C.
<h3>How to calculate change in temperature?</h3>
The change in temperature of a metallic substance in a calorimetry experiment can be calculated using the following formula:
Q = mc∆T
Where;
- Q = quantity of heat absorbed or released
- m = mass of copper
- ∆T = change in temperature
- c = specific heat capacity
According to this question, a 0.6g piece of copper is heated and fashioned into a bracelet The amount of energy transferred by heat to the copper is 62,100 J.
62100 = 0.6 × 390 × ∆T
62100 = 234∆T
∆T = 62100/234
∆T = 265.4°C
Therefore, the change of the copper temperature if a 0.6g piece of copper is heated and fashioned into a bracelet with 62,100 J amount of energy transferred is 265.4°C.
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1) Forces acting on your body: force of gravity and normal reaction
2) Due to Newton's second law, N = mg
Explanation:
1)
When you sit on the computer, there are only two forces acting on you:
- The force of gravity, acting downward, of magnitude , where m is your mass and is the acceleration due to gravity, downward
- The normal reaction exerted by the chair on you, , acting upward
Your body is in equilibrium (it doesn't move), this means that the two forces balance each other, therefore:
2)
We can now apply Newton's second law of motion to this situation; this law states that the net force acting on a body is equal to the product between its mass and its acceleration. Mathematically,
where
is the net force
m is the mass
a is the acceleration
In this situation, the net force is
So the equation becomes
However, we observe that your body is at rest; therefore, the acceleration is zero:
a = 0
And therefore,
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