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4 years ago

How does the body's arrangement of nerve receptors for touch make the braille system possible

Physics

2 answers:

Sphinxa [80]4 years ago

5 0

<h2>Answer:</h2>

<u>Braille is a system of raised dots that can be read with the fingers by people who are blind and they can recognize the dots by their fingers which have touch receptors.</u>

<h2>Explanation:</h2>

Sensory receptors perform various functions in our bodies. During vision, photo receptors respond to light intensity and color, but those people who are blind do not have functional photo receptors that is why they use their touch sense to recognize letters and words for reading. The technique is called braille system. Braille symbols are formed within units of space known as braille cells. A full braille cell consists of six raised dots arranged in two parallel rows each having three dots. These dots are touched by fingers and touch sensors in fingers take signals to the brain which takes no time to respond and hence the letters are recognized by the reader.

zvonat [6]4 years ago

4 0

Human fingers are so sensitive because they are highly innervated with sensory receptors. The body is arranged so that areas requiring discriminative touch have more nerve receptors.

Human fingers have glabrous skin or skin without hair. Within glabrous skin, there are specific receptors that may differ from hairy skin. The specific receptor in the finger tips that allows for discriminative touch are called <em>Meissner's Corpuscles</em>.

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3. What is the kinetic energy of a 1300 kg car moving at 26.3 m/s?

Alexxx [7]

Answer:K.E=449598.5j

Explanation:

Kinetic energy of a moving car=1/2mv^2

Where m is the mass of the car

And V is the velocity of the car

K.E=1/2 ×1300×26.3^2

K.E=449598.5j

3 0

3 years ago

An airplane of mass 1.60 ✕ 104 kg is moving at 66.0 m/s. The pilot then increases the engine's thrust to 7.70 ✕ 104 N. The resis

Ivan

(a) No, because the mechanical energy is not conserved

Explanation:

The work-energy theorem states that the work done by the engine on the airplane is equal to the gain in kinetic energy of the plane:

$W=\Delta K$ (1)

However, this theorem is only valid if there are no non-conservative forces acting on the plane. However, in this case there is air resistance acting on the plane: this means that the work-energy theorem is no longer valid, because the mechanical energy is not conserved.

Therefore, eq. (1) can be rewritten as

$W=\Delta K + E_{lost}$

which means that the work done by the engine (W) is used partially to increase the kinetic energy of the airplane ( $\Delta K$ ) and part is lost because of the air resistance ( $E_{lost}$ ).

(b) 77.8 m/s

First of all, we need to calculate the net force acting on the plane, which is equal to the difference between the thrust force and the air resistance:

$F=7.70\cdot 10^4 N - 5.00 \cdot 10^4 N=2.70\cdot 10^4 N$

Now we can calculate the acceleration of the plane, by using Newton's second law:

$a=\frac{F}{m}=\frac{2.70\cdot 10^4 N}{1.60\cdot 10^4 kg}=1.69 m/s^2$

where m is the mass of the plane.

Finally, we can calculate the final speed of the plane by using the equation:

$v^2- u^2 = 2aS$

where

$v=?$ is the final velocity

$u=66.0 m/s$ is the initial velocity

$a=1.69 m/s^2$ is the acceleration

$S=5.00 \cdot 10^2 m$ is the distance travelled

Solving for v, we find

$v=\sqrt{u^2+2aS}=\sqrt{(66.0 m/s)^2+2(1.69 m/s^2)(5.00\cdot 10^2 m)}=77.8 m/s$

8 0

3 years ago

Haley noticed a small spot on her skin that turned out to be skin cancer. Which treatment is her doctor most likely to use?

Igoryamba

Answer:

I'm going to guess D, or B

Explanation:

Medical oncologist A physician who treats cancer with medication, such as chemotherapy, immunotherapy, or targeted therapy. Radiation oncologist These doctors treat cancer with radiation therapy.

Simple excision, Mohs micrographic surgery, curettage and electrodesiccation, and cryosurgery are used to treat basal cell carcinoma and squamous cell carcinoma of the skin. Laser surgery is rarely used to treat basal cell carcinoma

7 0

3 years ago

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Why the efficiency of an engine cannot be 100%?

Marysya12 [62]

<span>No machine can operate at 100 percent efficiency because some of the energy input will always be used to overcome the force of gravity and the effects of friction and air resistance.</span>

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3 years ago

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babymother [125]

Answer: Waning Crescent

Explanation:

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3 years ago