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.
You are standing next to an old well. You want to know how far down the surface of the water is
(you are very thirsty), so you hold a rock above the well and drop it. You measure the amount of
time between when you release the rock and when you year the splash produced when the stone
hits the water at the bottom of the well to be T. You know that the speed of sound in air is vº
and the acceleration due to gravity is g. Neglecting air resistance, find the depth of the well.
7. A particle moves along the x axis according to the equation x=6t, where x is in meter
and t is in second, the speed of the particle is:
2 m/s
6 m/s
4 m/s
12 m/s
A
B
D
A soccer player kicks a rock horizontally off a 32 m high cliff into a pool of water. If the player hears the sound of the splash 2.72 s later, what was the initial speed given to the rock (in m/s)?
Assume the speed of sound in air is 343 m/s.
m/s
What If? If the temperature near the cliff suddenly falls to 0°C, reducing the speed of sound to 331 m/s, what would the initial speed of the rock have to be (in m/s) for the soccer player to
hear the sound of the splash 2.72 s after kicking the rock?
m/s
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