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3 years ago

Conduction of a nerve impulse would be the fastest in _________

Physics

1 answer:

Vinil7 [7]3 years ago

8 0

The options of the given are:

A. A large diameter myelinated fiber

B. A small diameter myelinated fiber

C. A large unmyelinated fiber

D. A small unmyelinated fiber

E. A small fiber with multiple Schwann cells

Answer: Option A, A large diameter myelinated fiber.

Explanation:

The conduction of the nerve impulse would be greatest in the myelinated fiber because the main function of the myelin sheath is to increase the speed of the impulse at which the electrical signals propagate.

In case of the unmyelinated sheath the nerve impulse travels slowly as the conduction waves but in case of the large diameter myelinated sheath the signals travel via saltatory conduction( hop)

In this type of propagation the signals are transferred from the node of Ranvier in one neuron to next node which increases the overall velocity of the action potentials.

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There are ________ main groups in the modern periodic table of elements.

patriot [66]

The Correct answer: 18

They are also known as families because they are in the same column.

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3 years ago

A 1000kg car has a speed of 32m/s. If it takes 7s to stop the car, what is the impulse and the average force acting in the car

Alexus [3.1K]

1) Impulse: -32,000 kg m/s

The impulse acting on the car is equal to the change in momentum of the car:

$I= \Delta p = m (v-u)$

where in this problem we have

m = 1000 kg is the mass of the car

v = 0 m/s is the final velocity of the car

u = 32 m/s is the initial velocity of the car

Substituting values into the equation, we find

$I=(1000 kg)(0-32 m/s)=-32,000 kg m/s$

2) -4751 N

The impulse exerted on the car is also equal to the product between the average force, F, and the duration of the collision, t:

$I=Ft$

where in this situation we know

$I=-32,000 kg m/s$ is the impulse

t = 7 s is the duration of the collision

Solving the formula for F, we find the average force:

$F=\frac{I}{t}=\frac{-32,000 kg m/s}{7 s}=-4,571 N$

and the negative sign means that the force is in the opposite direction to the motion of the car.

5 0

3 years ago

According to Ohm’s law, which combination of units is the same as the unit for resistance? volt ÷ ampere ampere × volt volt + am

Maksim231197 [3]

Answer:

volt ÷ ampere

Explanation:

The mathematical form of Ohms law is given by :

V = IR

Where V is voltage

I is current

R is resistance

$R=\dfrac{V}{I}$

The unit of voltage is volt and that of current is ampere

Unit of resistance :

$R=\dfrac{\text{volt}}{\text{ampere}}$

So, volt ÷ ampere is the same as the unit of resistance. Hence, the correct option is (a).

6 0

3 years ago

Read 2 more answers

For total internal reflection to occur, all of the following must happen but __________. light must travel slower in the first m

bija089 [108]

Answer:

Explanation:

When a ray of light passes through denser medium to rarer medium and then after refraction it comes back into the denser medium, the phenomenon is called total internal refraction.

There are two necessary conditions for the total internal refraction.

(1) The refraction takes place g=from denser medium to rarer medium.

(2) The angle of incidence in the denser medium should be more than the critical angle for that pair of media.

6 0

4 years ago

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If a satellite travels 62,000,000 miles from earth, how can we write it in scientific notation

Fudgin [204]

Answer:

6.2 x 10^6

Explanation:

The 6 at the end is an exponent the carrot is the symbol