PHYSICS HIGH SCHOOL

The speed of propagation of the action potential (an electrical signal) in a nerve cell depends (inversely) on the diameter of the axon (nerve fiber). If the nerve cell connecting the spinal cord to your feet is 1.2 m long, and the nerve impulse speed is 27 m/s, how long (in s) does it take for the nerve signal to travel this distance?

Answers

Answer 1

Answer:

0.044 seconds

Explanation:

Parameters given:

Length of nerve cell = 1.2m

Nerve impulse speed = 27m/s

Speed is given as:

Speed = distance/time

Therefore, we can make time the subject of the formula. We have:

Time = distance/speed

Hence, time taken for the nerve cell to travel this distance is:

Time = 1.2 / 27

Time = 0.044 seconds

It takes 0.044 seconds for the nerve signal to travel the distance of the nerve connecting the spinal cord to the feet.

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Select the correct answer. Rita is a registered dietician. What does her work entail? A. prescribing medication for clients B. cooking healthy meals for students C. demonstrating how to use gym equipment D. making recommendations for healthy eating habits

Answers

Answer:

Explanation:

The answer is D because:

A) Only doctors are allowed to prescribe medications.

B) Rita is not a chef/cook.

C) Rita is not a personal trainer

D) The job of a dietican is to provide reccomendations to their clients in order for them to implement a healthy lifestyle via consuming what is best for them.

Hope this helps :)

Answer:

D.) Making recommendations for healthy eating habits

Explanation: PLATO :)))

Which of the following states that absolute zero cannot be reached?A. the second law of thermodynamics
B. the first law of thermodynamics
C. the second and third laws of thermodynamics
D. the third law of thermodynamics

Answers

The second and third laws of thermodynamics states that absolute zero cannot be reached. The correct option among all the options that are given in the question is the third option or option "C". Both the laws actually deal with the relations that exist between heat and other forms of energy. I hope the answer helps you.

Answer:

D. the third law of thermodynamics

Explanation:

As per third law of thermodynamics we know that entropy of a perfect crystal comes to zero when the temperature of the crystal reaches to absolute zero.

So as per the theory of entropy we know that entropy of a system cannot be zero as it will reach zero then system will not exist.

So here we can say that

As per third law it is not possible to achieve zero kelvin or absolute zero temperature because at that temperature the entropy will become zero and then the system will not exist in that case.

So here we can say the correct answer will be

D. the third law of thermodynamics

The force between two point charges is described by _____ law.Newton's
Ohm's
Coulomb's
Gilbert's

Answers

Coulombs is the correct answer.

You drop a rock down a well that is 5.4 m deep. How long does it take the rock to hit the bottom of the well?

Answers

Equation of motion:

$y_(f)=y_(o)+v_(o)t+ (1)/(2) at^(2)$

Since initial velocity is zero, the second term goes away:

$y_(f)=y_(o)+0+ (1)/(2) at^(2)$

$y_(f)=y_(o)+(1)/(2) at^(2)$

$y_(f)-y_(o)= (1)/(2) at^(2)$

$y_(f)-y_(o)=5.4m$

$5.4m= (1)/(2) at^(2)$

$(2(5.4m) )/(a) = t^(2)$

$a = g = 9.81 (m)/( s^(2))$

$(2(5.4m) )/(9.81 (m)/( s^(2) ) ) = t^(2)$

$1.1 s^(2) = t^(2)$ $\sqrt{1.1 s^(2)} = \sqrt{t^(2)}$

$t = 1.05s$

Answer:

1.05 s

Explanation:

Which statement best describes the energy changes that occur while a child is riding on a sled down a steep, snow-covered hill? @4.3.8.A @2A)
Kinetic energy decreases and potential energy increases.

B)
Kinetic energy increases and potential energy decreases.

C)
Both potential and kinetic energy decrease.

D)
Both potential and kinetic energy increase

Answers

Answer is B)
When a child is riding on a sled down a steep, snow-covered hill, his elevation decreases and hence Kinetic energy increases and potential energy decreases.

Hope it helps!

How much kinetic energy does a 7.2-kg dog need to make a vertical jump of 1.2 m? the acceleration due to gravity is 9.8m / s^2

Answers

$E_k=mgh\n\nm=7.2\ kg\n\ng=9.8\ m/s^2\n\nh=1.2\ m\n\nE_k=7.2\cdot9.8\cdot1.2=84.672\ \left[(kgm^2)/(s^2)\right]=84.672\ [J]$

Assuming that no energy is wasted,
Use the equation Gpe=mgh
Mass*gravity*height
1.2*7.2*9.8=
84.672
(The answer might be wrong I did it in my head)

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