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Natali5045456 [20]
3 years ago
11

The speed of a nerve impulse in the human body is about 100 m/s. If you accidentally stub you toe in the dark, estimate the time

it takes the nerve impulse to travel to your brain. (Assume that you are approximately 1.6 m tall and that the nerve impulse travels at uniform speed.)
Physics
1 answer:
vodomira [7]3 years ago
4 0

Answer:

0.02 s

Explanation:

Take the (+x) direction to be up.  

The average velocity v during a time interval Δt is the displacement Δx divided by Δt.  

v=Δx/Δt

 =x_f-x_i/t_f-t_i                 (1)

We assume that your height is 1.6m  

Solving [1]

Δt=Δx/v

  = 0.02 s

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blsea [12.9K]

P = W / t

2000 = 30000 / t

t = 30000/2000

t = 30/2

t = 15 seconds

3 0
3 years ago
Read 2 more answers
When a 4.32 kg object is hung vertically on a certain light spring that obeys Hooke's Law, the spring stretches 2.92 cm.
Alika [10]

(a) 1.01 cm

First of all, we need to find the spring constant of the spring.

The force initially applied to the spring is equal to the weight of the block hanging on it:

F=mg=(4.32)(9.8) = 42.3 N

where m = 4.32 kg is the mass of the block and g = 9.8 m/s^2 is the acceleration of gravity.

When this force is applied, the spring stretches by

x=2.92 cm = 0.0292 m

We can find the spring constant by using Hooke's law:

F=kx

where k is the spring constant. Solving for k,

k=\frac{F}{x}=\frac{42.3}{0.0292}=1448.6 N/m

Later, the first object is removed and another object of mass

m' = 1.50 kg

is hung on the spring. The weight of this object is

F'=m'g=(1.50)(9.8)=14.7 N

So, if we use Hooke's law again, we can find the new stretching of the spring:

x'=\frac{F'}{k}=\frac{14.7}{1448.6}=0.0101 m = 1.01 cm

(b) 1.16 J

The work that must be done on the spring is equal to the elastic potential energy that would be stored in the spring, therefore:

W=\frac{1}{2}kx^2

where we have

k = 1448.6 N/m is the spring constant

x = 4.00 cm = 0.04 m is the new stretching

Solving the equation, we find the work that must be done by the external force:

W=\frac{1}{2}(1448.6)(0.04)^2=1.16 J

6 0
3 years ago
Look at the map of the United States. Which of the following would be a reasonable estimate for the amount of the U.S. coastline
MaRussiya [10]

Answer:

B

Explanation:

4 0
3 years ago
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When a sound wave encounters a barrier, what happens?
Tema [17]
Sound waves will either be reflected (echo effect) or absorbed (dissipated) depending upon the material make-up of the barrier
8 0
3 years ago
Gordon throws a baseball into the air. It rises, stops when it reaches its greatest height, and then falls back down to the grou
Arte-miy333 [17]

Answer:

A) When the baseball is rising

Explanation:

When an object like the baseball is thrown into the air, the kinetic energy  is gradually converted into potential energy. When the baseball rises to its maximum height, the kinetic energy becomes zero and the kinetic energy is fully converted into potential energy.

7 0
3 years ago
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