BIO BLOOD FLOW IN THE HEART. The human circulatory system is closed—that is. the blood pumped out of the left ventricle of the heart into the arteries is constrained to a series of continuous, branching vessels as it passes through the capillaries and then into the veins as it returns to the heart. The blood in each of the heart’s four chambers comes briefly to rest before it is ejected by contraction of the heart muscle. 2.90 If the contraction of the left ventricle lasts 250 ms and the speed of blood flow in the aorta (the large artery leaving the heart) is 0.80 m/s at the end of the contraction, what is the average acceleration of a red blood cell as it leaves the heart? (a) 310 m/s 2 ; (b) 31 m/s 2 ; (c) 3.2 m/s 2 ; (d) 0.32 m/s 2 .
BIO BLOOD FLOW IN THE HEART. The human circulatory system is closed—that is. the blood pumped out of the left ventricle of the heart into the arteries is constrained to a series of continuous, branching vessels as it passes through the capillaries and then into the veins as it returns to the heart. The blood in each of the heart’s four chambers comes briefly to rest before it is ejected by contraction of the heart muscle. 2.90 If the contraction of the left ventricle lasts 250 ms and the speed of blood flow in the aorta (the large artery leaving the heart) is 0.80 m/s at the end of the contraction, what is the average acceleration of a red blood cell as it leaves the heart? (a) 310 m/s 2 ; (b) 31 m/s 2 ; (c) 3.2 m/s 2 ; (d) 0.32 m/s 2 .
BIO BLOOD FLOW IN THE HEART. The human circulatory system is closed—that is. the blood pumped out of the left ventricle of the heart into the arteries is constrained to a series of continuous, branching vessels as it passes through the capillaries and then into the veins as it returns to the heart. The blood in each of the heart’s four chambers comes briefly to rest before it is ejected by contraction of the heart muscle.
2.90 If the contraction of the left ventricle lasts 250 ms and the speed of blood flow in the aorta (the large artery leaving the heart) is 0.80 m/s at the end of the contraction, what is the average acceleration of a red blood cell as it leaves the heart? (a) 310 m/s2; (b) 31 m/s2; (c) 3.2 m/s2; (d) 0.32 m/s2.
1.
2.
4.
You are driving a late model convertible car at the 65 mph speed limit with its soft flexible roof closed up
and the windows closed. You observe that the roof
a.
b.
bows inward.
is no different from when the car was at rest.
bows outward.
bows inward only when you are driving uphill.
e. bows inward only when you are driving downhill.
c.
d.
The carotid artery in a person's neck has plaque buildup in one region creating a partial blockage. When
the person is lying down on a bed (so any differential effects due to gravity if present can be ignored)
what can you say about the blood flow?
a.
The blood is flowing faster near the blockage than away from the blockage.
b. The blood is flowing slower near the blockage than away from the blockage.
C.
The blood is flowing at the same speed everywhere in the artery.
3. A rock is under water in a shallow lake. As the rock sinks deeper and deeper into water, the buoyant force
on it:
a.
b.
C.
increases.
decreases.
remains constant.
Think of…
5. The motion of a body moving vertically upwards is defined by the equation y=47.04t-4.90t^2,
where y is in meters and t is in seconds. Determine the maximum height attained by the body.
4.8
118.296
9.6
O 112.896
ООО
1. A spelunker (cave explorer) drops a stone from rest into a
hole. The speed of sound is 343 m/s in air, and the sound
of the stone striking the bottom is heard 1.50 s after the
stone is dropped. How deep is the hole?
Chapter 2 Solutions
University Physics with Modern Physics (14th Edition)
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