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Chapter 1: 22 (page 28)
How many times does a human heart beat during a person鈥檚 lifetime? How many gallons of blood does it pump? (Estimate that the heart pumps 50 cm3 of blood with each beat.)
The human heart beats 3027456000 time in whole lifetime.
The heart pump 400 million gallon of blood in whole life time.
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A ball is thrown straight up from the edge of the roof of a building. A second ball is dropped from the roof later. Ignore air resistance. (a) If the height of the building is, what must the initial speed of the first ball be if both are to hit the ground at the same time? On the same graph, sketch the positions of both balls as a function of time, measured from when the first ball is thrown. Consider the same situation, but now let the initial speedof the first ball be given and treat the heightof the building as an unknown. (b) What must the height of the building be for both balls to reach the ground at the same time if (i)localid="1655791911691" ? (c) Ifis greater than some value, no value ofexists that allows both balls to hit the ground at the same time. Solve for. The valuehas a simple physical interpretation. What is it? (d) Ifis less than some value, no value ofexists that allows both balls to hit the ground at the same time. Solve for. The valuealso has a simple physical interpretation. What is it?
An astronaut has left the International Space Station to test a new space scooter.
Her partner measures the following velocity changes, each taking place in a interval.
What are the magnitude, the algebraic sign, and the direction of the average acceleration in each interval?
Assume that the positive direction is to the right.
(a) At the beginning of the interval, the astronaut is moving toward the right along the x-axis at , and at the end of the interval she is moving toward the right at .
(b) At the beginning she is moving toward the left atrole="math" localid="1655276110547" , and at the end she is moving toward the left at .
(c) At the beginning she is moving toward the right at , and at the end she is moving toward the left atrole="math" localid="1655276636193" .
For the hydraulic lift shown in Fig. 12.7, what must be the ratio of the diameter of the vessel at the car to the diameter of the vessel where the force F1 is applied so that a 1520-kg car can be lifted with a force F1 of just 125 N?
In the methane molecule, , each hydrogen atom is at a corner of a regular tetrahedron with the carbon atom at the center. In coordinates for which one of the bonds is in the direction of role="math" localid="1655792646877" , an adjacent bond is in thedirection. Calculate the angle between these two bonds.
How many times does a typical person blink her eyes in a lifetime?
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