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Tcecarenko [31]
3 years ago
8

When did humans first learn that earth is not the center of the universe? around the time that early humans acquired language wi

thin the past 500 years about 2000 years ago we haven't; there is still considerable scientific debate about whether earth is the center of the universe?
Physics
1 answer:
lubasha [3.4K]3 years ago
8 0
The question was settled roughly 500 years ago. There's no longer any scientific debate on the matter.
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A string fixed at both ends has a length of L = 2.20 m, and a mass of m=0.0022 kg. The tension in the string is fixed at 14.30 N
PilotLPTM [1.2K]

Answer:

a) f₀ = 3250 Hz ,  f₁ = 6500 Hz, b)   μ = 0.00100 kg/m

Explanation:

a) For standing waves to occur, waves of equal frequency that travel in opposite directions must be added

In the points where it is fixed there are nodes and in bellies or anti nodes in another symmetrical point

Fundamental wave:   node at the ends, a belly (antinode in the center

                                 L = 1 / 2 λ

Extreme node, two bellies   L = 2/2 λ

For more bellies      L = n / 2 λ

Therefore the equation for the wavelength is

                λ = 2 L / n                 n = 1, 2, 3,…

Let's calculate

    λ₁ = 2/1 (2.20)

    λ₁ = 4.4 m

    λ₂ = 2/2 2.20

    λ₂ = 2.20 m

Having the wavelength we can use the relationship of wave speed and wavelength and frequency

     v = λ f

     v = √ T /μ

     v = √ 14.30 / 0.001

     v = 14300 m / s

     f = v / λ

     f₀ = 14300 / 4.4

     f₀ = 3250 Hz

     f₁ = 14300 / 2.2

     f₁ = 6500 Hz

b) linear density is defined as mass per unit length

      μ = m / l

     μ = 0.0022 / 2.20

      μ = 0.001 kg/m

5 0
4 years ago
Match the following items. 1. empathy a personal view of a situation; ability to understand the senses 2. perception mental heal
Salsk061 [2.6K]

Answer:

perception - A personal view of a situation...

Psychiatrist - mental health professional...

Clinical - concerned with the treatment of disease...

cognition - a person's ability to think.

empathy - Identifying someone's situation...

humanism - a person should be considered as a whole...

Educational psychologist - concerned with the way humans learn ...

Explanation:

1. Perception is the ability to interpret and understand what we sense through our different senses. In other words, it is the ability to understand what is going on in our environment through sight, sound, touch, and the like.

2. A psychiatrist is a medical doctor that deals with the treatment, prevention, and diagnosis of metal disorders. They can also treat patience through medication because they are allowed to prescribe medicines.

3. Clinical medicine involves the actual treatment of patients. You can think of it as the actual practice of medicine, and not theoretical and not just work in laboratories.

4. Cognition is a mental process that not only involves thinking, but also comprehension. It involves acquiring knowledge through experience and observation.

5. Empathy is the ability to understand how someone else is feeling in a particular situation. There's a saying, "Putting yourselves in other's shoes." This means to understand how it feels to be in that situation, which is also known as the act of empathizing.

6. Humanism, as the name suggests is HUMAN-centered. This means that one is considered not only by what others see but what the person sees as well. It is concerned with everything that has to do with that person both externally and internally.

7. Educational psychologist deals with children and school specifically. They assess how humans learn, how they think and how they behave in the school setting. They also do councelling for students, parents, teachers, and other people involved in the educational communities.

8 0
3 years ago
Translation is the process by which the DNA code is reads to create the RNA strand
Leya [2.2K]
True............................................
5 0
4 years ago
Is a baseball and cannon are dropped from the same height at the same time, which ball will hit the ground first?
lara31 [8.8K]
If you include the effects of falling through air, then you have to know the
shape, size, weight, and surface texture of the objects.  You also have to
know the height from which they're dropped, and the temperature, pressure,
and humidity of the air.  All these things make a difference in how they fall.

If you ignore the effects of falling through air, like build a giant metal tank
and pump all the air out of it, and ONLY talk about the effects of gravity, then
ALL OBJECTS accelerate at the same rate.  If you drop two things from the
same height at the same time, then they both hit the ground at the same time,
traveling at the same speed, no matter what they are.  They could be a piece of
tissue and a car ! 

There are several museums where they have a big glass pipe that you can
see through, and they pump the air out of the pipe and drop a feather and a
bowling ball from the top inside at the same time, and they both reach the
bottom together.   

If gravity is the only force on an object, then all objects fall at the same rate.
8 0
3 years ago
Read 2 more answers
A model car is 29 cm in length. How many inches long is it?
Delvig [45]

1 cm = 0.39 in.

29 cm = 0.39 * 29

29 cm = 11.41 in.


7 0
4 years ago
Read 2 more answers
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