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garik1379 [7]
3 years ago
13

13. Which statement correctly describes the human heart? A. It has three chambers, and pumps blood directly into veins. B. It ha

s two chambers, and it is composed of cardiac muscle. C. It has three chambers, and it is composed of cardiac muscle. D. It has four chambers, and pumps blood directly into arteries. 14. An individual who has had chicken pox rarely gets this disease again. This situation is an example of A. biological control B. negative feedback C, immunity D. metamorphosis 15. The nervous system is most directly involved in A. production of blood cells B. stimulation of rapid growth movement C. elimination of body wastes D. initiation of muscle
Physics
2 answers:
Marta_Voda [28]3 years ago
8 0
Number 13 is D the heart has 4 chambers and pumps blood to the arteries and number 14 us C

yanalaym [24]3 years ago
5 0


13. D ( The left atria and ventricle and the right atria and ventricle)

14. C

15.D (With signals coming from the brain, the nervous system would most likely influence your muscular movement)

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Physics questions please help me
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Hi,Find  answers from Task 5

1.(X+4)+(X)+(X+4)+(X)=50cm

4x+8=50cm

4x=42

X=10.5cm

Length=10.5+4=14.5cm

Width=10.5cm

Area= length × width=(10.5/100) × (14.5/100) =0.0152m2

2. Volume of a sphere= 4/3 ×π×r³

4/3 ×π×r³=3.2×10^-6 m³

r³=3.2×10^-6 m³/1.33×π

r³=7.64134761e-7

r=0.00914m

Surface area of the blood drop= 4πr²

=4×3.142×0.00914×0.00914=0.00105m²

3.

Equation of an ideal gas     = PV =n RT  

Equation for pressure, = P= n RT/V

Equation for the volume of an ideal gas= V= n RT/P

If the volume of gas doubles ,V(new)=  2n RT/P

Equation for temperature of an ideal gas, T = PV/n R

If temperature of gas triples, T (new)= 3PV/n R

New Equation for Pressure, = n× R× (3PV/n R)/(2n RT/P)

Pressure factor increase= P(new)/P(old)  ={ n× R× (3PV/n R)/(2n RT/P)}/{ n RT/V}

=3PV²/2n RT
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2 years ago
(15 POINTS) Victor drew a diagram to show the life cycle of a low-mass star.
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The answer is c so the area can grow
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3 years ago
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2 Which is true of a parallel circuit?
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Answer:

fxb

c

Explanation:bfffffffff

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3 years ago
A team of engineering students is testing their newly designed 200 kg raft in the pool where the diving team practices. The raft
elena-s [515]

Answer:

The water level rises more when the cube is located above the raft before submerging.

Explanation:

These kinds of problems are based on the principle of Archimedes, who says that by immersing a body in a volume of water, the initial water level will be increased, raising the water level. That is, the height in the container with water will rise in level. The difference between the new volume and the initial volume of the water will be the volume of the submerged body.

Now we have two moments when the steel cube is held by the raft and when it is at the bottom of the pool.

When the cube is at the bottom of the water we know that the volume will increase, and we can calculate this volume using the volume of the cube.

Vc = 0.45*0.45*0.45 = 0.0911 [m^3]

Now when a body floats it is because a balance is established in the densities, the density of the body and the density of the water.

Ro_{H2O}=R_{c+r}\\where:\\Ro_{H2O}= water density = 1000 [kg/m^3]\\Ro_{c+r}= combined density cube + raft [kg/m^3]

Density is given by:

Ro = m/V

where:

m= mass [kg]

V = volume [m^3]

The buoyancy force can be calculated using the following equation:

F_{B}=W=Ro_{H20}*g*Vs\\W = (200+730)*9.81\\W=9123.3[N]\\\\9123=1000*9.81*Vs\\Vs = 0.93 [m^3]

Vs > Vc, What it means is that the combined volume of the raft and the cube is greater than that of the cube at the bottom of the pool. Therefore the water level rises more when the cube is located above the raft before submerging.

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3 years ago
It is now virtually certain that the dominant cause of recent ice ages is
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<span>Variations in Earth-Sun orbital relationships.</span>
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