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Elanso [62]
2 years ago
11

The speed of propagation of the action potential (an electrical signal) in a nerve cell depends (inversely) on the diameter of t

he axon (nerve fiber). If the nerve cell connecting the spinal cord to your feet is 1.3 m long, and the nerve impulse speed is 33 m/s, how long (in s) does it take for the nerve signal to travel this distance?
Physics
1 answer:
zysi [14]2 years ago
3 0

Answer:

Explanation:

Speed of electrical nerve signal = 33 m /s

Distance travelled = 1.3 m

time taken = distance / speed

= 1.3 / 33  

= .039 s

= 39 ms ( millisecond )  .

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A ski tow operates on a 15.0° slope of length 300 m. The rope moves at 12.0 km/h and provides power for 50 riders at one time, w
Whitepunk [10]

Answer:

A power of 29562.1 W is required to operate the tow.

Explanation:

Given:

Angle of inclination (x) = 15.0°

Length of slope (L) = 300 m

Mass of each rider = 70 kg

Number of riders = 50

Speed of rope (v) = 12 km/h

Now, mass of the 50 riders (m) = Mass of 1 rider × Number of riders

                                                    = 70 × 50 = 3500 kg

The force acting on the tow is the component of weight of 50 riders in the direction opposite to the motion of the tow.

The component of weight along the slope is given as:

F_{slope}=mg\sin x=3500\times 9.8\times \sin 15^\circ = 8877.5\ N

Now, the tow must apply the same force in the direction of motion to move it at constant speed.

Now, speed is in km/h. So, we need to convert it to m/s using the conversion factor.

We know that, 1 km/h = 5/18 m/s

Therefore, 12.0 km/h = 12\times \frac{5}{18}=3.33\ m/s

Therefore, the minimum power required to operate the tow is given by the formula:

Power = Force × Velocity

P=8877.5\times 3.33=29562.1\ W

Therefore, a power of 29562.1 W is required to operate the tow.

3 0
3 years ago
the mass of piece of granite is 15.6g when it is suspended can a mass of 5.5g of water is displaced find the dencity of granite
Blababa [14]

Answer:

2836.36 kg/m³

Explanation:

Applying,

Densty of granite(D')/Density of water(D) = weight of granite(W')/weight of water displaced(W)

D'/D = W'/W................... Equation 1

Make D' the subject of the equation

D' = W'D/W............... Equation 2.

From the question,

Given: W' = mg = 9.8(15.6/1000) = 0.15288 N, W = 9.8(5.5/1000) = 0.0539 N, Constant: D = 1000 kg/m³

Substitute these values into equation 2

D' = 1000(0.15288)/0.0539

D' = 2836.36 kg/m³

3 0
2 years ago
A 1.3-kg book rests on a table. A downward force of 15 N is exerted on the top of the book by a hand pushing down on the
garri49 [273]

Answer:

The net force will be:

F_{net} = 142.53\: N

Explanation:

The net force is given by:

F_{net} = W_{b}+F

F_{net} = m_{b}g+15

F_{net} = 142.53\: N

I hope it helps you!

                 

7 0
2 years ago
Two objects with a Gravitational Force of 5000 N are moved apart 3 times the original distance. What is the new gravitational at
allochka39001 [22]

Gravitational force between two objects will depends on mass and distance between the two objects

It is given by the formula as

F = \frac{Gm_1m_2}{r^2}

Now here we can say that it depends inversely on square of distance between two masses

now if force is 5000 N when two masses are at distance "r" from each other

so it is given as

5000 = \frac{Gm_1m_2}{r^2}

similarly we can say that if distance is increased by 3 times then we will have

F = \frac{Gm_1m_2}{(3r)^2}

now we will find the ratio of two forces

\frac{F}{5000} = \frac{1}{9}

so now the new force will be given as

F = \frac{5000}{9} = 555.5 N

6 0
3 years ago
The acceleration due to gravity is
Gnesinka [82]

Answer:

9.8 m/s^2

Explanation:

This is a constant that you should memorize

6 0
3 years ago
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