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.
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
hearts four chambers comes briefly to rest before it is ejected by
contraction of the heart muscle.
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.
3. A bullet 2.50 cm long is fired at 450 m/s and passes straight through a 12.0 cm thick
board, exiting at 275 m/s.
(a) What is the average acceleration of the bullet through the board?
(b) What is the total time that the bullet is in contact with the board?
(c) What minimum thickness could the board have if it was supposed to bring the
bullet to a stop?
An object has an initial velocity
v1 = 4.3î + -3.7jm/s. Over a
|
period of timet = 1.4 s, its velocity
became vz =
-2î + 0.5j m/s.
The magnitude of the
displacement of the object (in
m) is.
а. 0.83
b. 13.79
С. 2.65
d. 8.28
е. 2.76
Chapter 2 Solutions
University Physics with Modern Physics Plus Mastering Physics with eText -- Access Card Package (14th Edition)
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