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3 years ago

What are all the different energy transformations and what are examples of them being used? PLEASE HELP ;)

1 answer:

6 0

There are many different forms of energy such as electrical, thermal, nuclear, mechanical, electromagnetic, sound, and chemical.

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How long does it take to fall from 5000 feet?

WINSTONCH [101]

It depends on your weight, your hieght, and how fast you are falling

4 0

4 years ago

A 600-nm-wavelength beam of light is incident on a soap film with air on both sides. The film has an index of refraction of 1.33

sergiy2304 [10]

Answer:

the film's minimum thickness to make the reflected light enhanced in brightness is 112.8 nm

Explanation:

Given the data in the question;

wavelength λ = 600 nm

index of refraction = 1.33

so the film's minimum thickness to make the reflected light enhanced in brightness = ?

condition for maxima for reflected light is;

2nt = [ ( 2m + 1 )λ ] / 2

we solve for t

4nt = [ ( 2m + 1 )λ ]

t = [ ( 2m + 1 )λ ] / nt

Now, for minimum thickness m = 1

t = λ / 4n

so we substitute in our values;

t = 600 nm / ( 4 × 1.33 )

t = 600 nm / 5.32

t = 112.78195 ≈ 112.8 nm { one decimal place }

Therefore, the film's minimum thickness to make the reflected light enhanced in brightness is 112.8 nm

4 0

3 years ago

A sailboat took 25 hours to cover 1/4 of a journey. Then, it

ozzi

Answer:

Explanation:

4 0

3 years ago

Mountain pull. A large mountain can slightly affect the direction of ""down"" as determined by a plumb line. Assume that we can

Nastasia [14]

Answer:

6.18 um

Explanation:

The plumb line will be pulled down by a combination of the gravitationall pull of Earth and of the mountain. The Earth pulls down and the mountain to the side. Because of this it will fall not in a straight line down, but slightly to the side. Since the plumb line will follow the compound gravity we can imagine a rectangle triangle formed by the plumb line, a vertical line that ends at the same height as the plumb line, and the sideways displacement.

The total gravity will be proportional to the plumb line lenght, the vertical line will be proportional to Earth's gravity and the sideways displacement to the mountain pull.

The gravity of Earth is 9.81 m/s^2

The pull of the mountain will be defined by Newton's law of universal gravitation:

$F = G \frac{m1 * m2}{r^2}$

Where

F: pull force

G: universal gravitational constant (6.67e-11 m^3/(kg * s)

m1: mass of the mountain

m2: mass of the plumb

r: distance between mountain and plumb (3 km in this case)

If we divide both sides by m2 we obtain the acceleration towards the mountain of the plumb

$a = G \frac{m1}{r^2}$

Now we need the mass of the mountain. This will be its volume times it's density. The volume depends on the radius (since we consider it as a sphere)

$m1 = \delta * \frac{4}{3} * \pi * r^3$

$m1 = 2.6e3 * \frac{4}{3} * \pi * 1000^3 = 1.09e13 kg$

So, the acceleration on the plumb will be

$a = 6.67e-11 \frac{1.09e13}{3000^2} = 8.08e-5 m/s^2$

This is very small compared to the pull of Earth, so we can make an approximation that the length of the plumb line is equal to vertical line.

We can use the principle of similar triangles to say that:

$\frac{\Delta x}{L} = \frac{a}{g}$

So:

$\Delta x = \frac{a * L}{g} = \frac{8.08e-5 * 0.75}{9.81} = 6.18e-6 m = 6.18 um$

3 0

3 years ago

Lemon falling at a constant speed from a tree with no air resistance, draw a free body diagram

HACTEHA [7]

Since the lemon is falling without any air resistance, the only force acting on the lemon is the acceleration due to gravity.

But, since we know that the lemon is falling with a constant speed. There has to be another unknown force to balance the gravitational force. Which has been shown in the freebody diagram

8 0

3 years ago