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3 years ago

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How do the valves do in the heart

1 answer:

Rina8888 [55]3 years ago

8 0

Answer:

The valves prevent the backward flow of blood. These valves are actual flaps that are located on each end of the two ventricles (lower chambers of the heart). They act as one-way inlets of blood on one side of a ventricle and one-way outlets of blood on the other side of a ventricle.

Explanation:

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A crate on a motorized cart starts from rest and moves with a constant eastward acceleration ofa= 2.60 m/s^2. A worker assists t

Leona [35]

Answer:

To obtain the power, we first need to find the work made by the force.

1) To calculate the work, we need the next equation:

$\int\limits {F} \, dx$

So the force is given by the problem so our mission is to find 'dx' in terms of 't'

2) we know that:

$\frac{dV}{dt} = a = 2.6$

So we have:

$v = 2.6t$

Then:

$\frac{dx}{dt} = V = 2.6t\\ \\dx = 2.6t*dt$

3) Finally, we replace everything:

$\int\limits^{4.7}_{0} {5.4t*2.6t} \, dt$

After some calculation, we have as a result that the work is:

161.9638 J.

4) To calculate the power we need the next equation:

$P = \frac{W}{t}$

So

P = 161.9638/4.7 = 34.46 W

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3 years ago

Redox reactions involve the gain or loss of _____.A. neutronsB. phosphateC. electronsD. protons

vovangra [49]

Redox reactions involve the gain or loss of C. electrons

7 0

3 years ago

Radio waves travel at the speed of light, which is 3.00 u 108 m/s. How many kilometers will radio messages travel in exactly one

egoroff_w [7]

Answer:

Distance traveled will be $9.462\times 10^{12}km$

Explanation:

We have given speed of the light $v=3\times 10^8m/sec$

We have to find the distance traveled by light in 1 year

We know that 1 year = 8760 hour

And 1 hour = 60×60 = 3600 sec

So 1 year $=8760\times 3600=3.154\times 10^{7}sec$

We know that distance = speed × time

So distance traveled by light in one year $=3.154\times 10^7\times 3\times 10^8=9.462\times 10^{15}m$

We have to fond the distance in km

As we know that 1 km = 1000 m

So $9.462\times 10^{15}m=\frac{9.462\times 10^{15}}{1000}=9.462\times 10^{12}km$

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3 years ago

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Igoryamba

Answer:

True

Explanation:

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Which of the following is the BEST example of a goal

kvasek [131]

I will run 2 miles three times a week for 4 weeks.

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3 years ago