Answer: A... Thermal energy from the ice is transferred to the air.
Explanation: because I just know.
Answer:
78.35°
Explanation:
THIS IS THE COMPLETE QUESTION BELOW;
A layer of ethyl alcohol (n = 1.361) is on top of water (n = 1.333). To the nearest degree, at what angle relative to the normal to the interface of the two liquids is light totally reflected?
From Snell's Law,
(ni)/(nr) = Sin (θr) / Sin (θi)
Where
θi = Angle of Incidence
θr = Angle of refraction
ni = Refractive index given for ethyl alcohol
nr = Refractive index of medium from which light is refracted
ni = 1.361
nr = 1.333
, θr = 90° ( Critical Angle is reffered to as Angle of Incidence at refracted angle of 90°) (θi = θc)
(ni)/(nr) = Sin (θr) / Sin (θi)
1.361/ 1.333 = Sin (90°)/ Sin( θc)
1.021= 0.894/ Sin( θc)
Sin( θc)= (0.9794
θc = Sin⁻¹ 0.9794)
θc = 78.35°
The presence of dark energy has been deduced by studying the movement of stars and galaxies.
Around the 1990's, astronomers studying the rate of expansion of the universe discovered something abnormal. Instead of slowing down due to gravity or even remaining the same, the universe was expanding at an alarming rate.
The rate of expansion was measured using the light coming from supernovae ( massive exploding stars ). While puzzled by this idea, some scientists brought up an old idea by Albert Einstein, also called his "biggest blunder", that there is an energy contained in the vacuum of space that is repulsive and is accelerating the expansion of the universe. This mysterious energy is what is known as dark energy today.
Dark energy, most at times is confused with dark matter. Very little is known about it as of today, as it is invisible because it doesn't react to visible light. The presence of dark energy is therefore studied by monitoring its gravitational pull on distant stars and galaxies.
To learn more about dark energy, visit;
brainly.com/question/24197345
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Answer:
a = 50 [m/s²]
Explanation:
This type of problem can be solved using Newton's second law, which tells us that the sum of forces on a body is equal to the product of mass by acceleration.
∑F = m*a
where:
F = force =25 [N] (units of Newtons)
m = mass = 0.5 [kg]
a = acceleration [m/s²]
Answer:
the mass of the truck is 2 kg.
Explanation:
Given;
mass of the car, m₁ = 3 kg
initial velocity of the car, u₁ = 40 m/s
initial velocity of the truck, u₂ = 60 m/s
let the mass of the truck = m₂
Apply the principle of conservation of linear momemtum;
m₁u₁ = m₂u₂
m₂ = (m₁u₁) / u₂
m₂ = (3 x 40) / (60)
m₂ = 2 kg
Therefore, the mass of the truck is 2 kg.