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erastovalidia [21]

3 years ago

13

What is the role of the nervous system?

1 answer:

zimovet [89]3 years ago

4 0

The nervous system is responsible for sending, receiving, and interpreting information from all parts of the body. The nervous system monitors and coordinates internal organ function and responds to changes in the external environment. (The role) The central nervous system consists of the brain and the spinal cord. It is part of the overall nervous system that also includes a complex network of neurons, known as the peripheral nervous system. (Central nervous system)

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A body is moving with an acceleration of 60 m/s^2(square).If the force applied to the body is 4200N.Calculate its mass.

Pavel [41]

Hello, for this use the <u>2nd law of Newton:</u>

F = ma

Replacing:

4200 N = m * 60 m/s^2

Resolving:

4200 N / 60 m/s^2 = m

70 kg = m

The mass is <u>70 kg</u>

8 0

3 years ago

assuming that the seafloor is spreading at a rate of 1.3cm/yr, calculate how long it took africa's west coast to move 2400 kn aw

Verdich [7]

Answer: 184,615,384.6 years

Explanation:

This problem can be solve by the following equation:

$V=\frac{d}{t}$ (1)

Where:

$V=1.3 \frac{cm}{year} \frac{1 km}{100000 cm}=0.000013 \frac{km}{year}$ is the spreading rate of the seafloor, its velocity

$d=2400 km$ is the distance the Africa's west coast moved at this rate

$t$ is the time it took to the coast to move the descibed distance

Isolating $t$ from (1):

$t=\frac{d}{V}$ (2)

$t=\frac{2400 km}{0.000013 \frac{km}{year}}$ (3)

Finally:

$t=184,615,384.6 years$ This is the time it took to the Africa's west coastto move away from the Mid atlantic ridge.

3 0

3 years ago

10 Select the correct answer. What property of a wave remains unchanged when a wave enters a different medium? O A amplitude OB.

Mama L [17]

a and b ik thats the awser becuse imjust did it

8 0

3 years ago

Read 2 more answers

You are moving into an apartment and take the elevator to the 6th floor. Suppose your weight is 790 N and that of your belonging

aliina [53]

Answer:

a) $W=26600J$

b) $W=-12008J$

Explanation:

Given the information from the exercise we can calculate the work done by the elevator using the following formula:

$W=F*s$

a) Considering you and your belongings as a system we know that the elevator is applying a Normal reaction force of:

$F=790N+960N=1750N$

Since the force applied and the displacement is in the same direction, the work done by the elevator is positive

$W=(1750N)(15.2m)=26600J$

b) The reaction force applied by the elevator is the same as the weight of the person

$F=790N$

Since the force applied and the displacement is in opposite direction, the work done by the elevator is negative

$W=-(790N)(15.2m)=-12008J$

7 0

4 years ago

An object stays at rest until what happens to it?

bixtya [17]

D. an outside or unbalanced force acts upon the object.

4 0

3 years ago