when a beam of light passes at an oblique angle into a material of lower optical density, the angle of incidence is ?

The correctanswer between all the choices given is the third choice or letter C. I amhoping that this answer has satisfied your query and it will be able to helpyou in your endeavor, and if you would like, feel free to ask another question.

Answer: option c: v₀ = v₂ > v₁ > 0

Explanation:

1) Velocity is the rate of change of the position with time. Therefore, in a graph of position vs time, the velocity is the slope of the path that describes the motion.

2) In this case you are requested to compare the speeds, i.e. just the magnitudes of the velocities. You can perform that by comparing the slopes in the three positions (x₀, y₀), (x₁, y₁), and (x₂, y₂).

3) Regarding v₁, since it corresponds to the peak of the curve (x₁.y₁), the vertical component of the velocity is zero (the horizontal component is constant, since there is not any horizontal force acting), so at this point the speed reaches its minimum value, then v₁ > 0, and v₁ is less than any other speed.

4) Regarding v₀ and v₂, at (x₀, y₀) and (x₂, y₂), note that those are points at the same distance from the axis of symmetry of the curve (assuming it is perfect parabola, which is what the graph intends to show).

That means that the velocities at those points are equal in magnitude but opposite in signs. Since, you are asked about the speed, which is magnitude, you conclude v₀ = v₂.

In conclusion v₀ = v₂ > v₁ > 0, which is the option c.

a)The direction that she must aim herself through the water to arrive at the dock will be 73.7°.

b)The time it takes for the swimmer to cross the river will be 240 seconds.

What is speed?

Speed is defined as the rate of change of the distance or the height attained. it is a time-based quantity. it is denoted by u for the initial speed while v for the final speed. its si unit is m/sec.

Given data;

The maximum speed of the swimmer In still water,v=1.25m/s.

Speed of river = 0.35m/s [E]

α is the direction that she must aim herself through the water to arrive at the dock.

t is the time it takes for the swimmer to cross the river

The distance from the starting point to the dock is,s = 300 m

If the swimmer were to swim straight, the water's speed along the x-axis would have to match that of the swimmer.

α is the angle between vx and v

The value of the

The time that the swimmer will use for reaching the dock;

s = V×t

t = s/(v)

t=300 m / 1.25 m/sec

t = 240 seconds

Hence, the direction that she must aim herself through the water to arrive at the dock. and it takes for the swimmer to cross the river will be 73.7° and 240 seconds respectively.

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Explanation:

As you can see in the picture, we want the swimmer to go on a straight line, so the speed of the water must be equal to the speed of the swimmer along the x-axis. We also know the value of v, so we can calculate the of the cosine of the angle (alpha) between Vx and V. Thanks to the fundamental relation of gioniometry (cos^2(x) + sin^2(x) = 1) we can find the sine of alpha and calculate Vy. With Vy we can calculate the time that the swimmer will use for reaching the dock: s = Vy * t => t = s/(Vy).

I'll let you do all the calculations, you just have to plug in values.

A red shift in the spectrum of the light from an object indicates the object is moving a. away from you. A redshift occurs when light waves are stretched into lower frequencies. a.away from

The mass of the rocket is 2.9 kg.

To calculate the mass of the rocket, you can use Newton's second law of motion, which relates force (F), mass (m), and acceleration (a) as F = ma. In this case, you have the force (44 N) and the acceleration (15.3 m/s²).

Rearrange the formula to solve for mass:

m = F / a

m = 44 N / 15.3 m/s² ≈ 2.9 kg

So, the mass of the rocket is approximately 2.9 kilograms. The mass is rounded to the nearest tenth of a kilogram as specified in the question. This mass represents the amount of matter in the rocket and is a critical factor in determining how the rocket accelerates when subjected to the given force.

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Answer:

2.9

Explanation:

In the equation you get 2.88 but you round that to the nearest tenth so you get 2.9