Concept explainers
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.
2.92 The velocity of blood in the aorta can be measured directly with ultrasound techniques. A typical graph of blood velocity versus time during a single heartbeat is shown in Fig. P2.92. Which statement is the best interpretation of this graph? (a) The blood flow changes direction at about 0.25 s; (b) the speed of the blood flow begins to decrease at about 0.10 s; (c) the acceleration of the blood is greatest in magnitude at about 0.25 s; (d) the acceleration of the blood is greatest in magnitude at about 0.10 s.
Figure P2.92
Trending nowThis is a popular solution!
Chapter 2 Solutions
University Physics with Modern Physics (14th Edition)
Additional Science Textbook Solutions
Tutorials in Introductory Physics
Physics for Scientists and Engineers with Modern Physics
Essential University Physics: Volume 2 (3rd Edition)
Conceptual Physical Science (6th Edition)
Essential University Physics: Volume 1 (3rd Edition)
- In 1991, four English teenagers built an electric car that has a velocity of 3 m/s [N 30⁰ E]. Suppose it takes 8.0 s for this car to accelerate to the new velocity of 18.0 m/s [W 30⁰ S]. What is the magnitude of the car’s acceleration?arrow_forwardTwo 47. identical pellet guns are fired simultaneously from the edge of a cliff. These guns impart an initial speed of 30.0 m/s to each pellet. Gun A is fired straight upward, with the pellet going up and then falling back down, eventually hitting the ground beneath the cliff. Gun B is fired straight downward. In the absence of air resistance, how long after pellet B hits the ground does pellet A hit the ground? 48. mmh An astronaut on a distant planet wants to determine its accel- eration due to gravity. The astronaut throws a rock straight up with a ve- locity of +15 m/s and measures a time of 20.0 s before the rock returns to his hand. What is the acceleration (magnitude and direction) due to gravity on this planet? I 52. A ball is thrown straight upward. At 4.00 m above its launch point, the ball's speed is one-half its launch speed. What maximum height above its launch point does the ball attain? 53. ssm From her bedroom window a girl drops a water-filled balloon to the ground,…arrow_forwardThe acceleration of a particle is given by ax(t) = -2.03 m/s2+ (2.93 m/s2)t I. Find the initial velocity V0x such that the particle will have the same x-coordinate at time t = 3.97 t as it had at t=0. (Express your answer in meters per second.) II. What will be the velocity of time t = 3.97 s? (Express your answer in meters per second.)arrow_forward
- Q1. a). A ball is thrown upwards into the air. Total time for the ball to move upwards to the peak and then return to the ground is (251.85) seconds. Find the height to which the ball rises before it reaches its peak. b). You drive a beat up truck along a straight road for 11 km at 60 km/h, at which point the truck runs out of gasoline and stops. Over the next (251.85) min, you walk another 5 km farther. What is your overall displacement from the beginning of drive to your arrival at the station? What is the time interval from the beginning of your drive to your travel at the station? What is your average velocity from beginning of your drive to your arrival at the station?arrow_forwardPROBLEM 2.34 43. An object is thrown vertically upward and has a speed of 20.0 m/s when it reaches two thirds of its maximum height above the launch point. Determine its maximum height. 63.16 m с. 65.16 m d. 67.16 m а. b. 61.16 marrow_forwardOn February 15, 2013, a superbolide meteor (brighter than the Sun) entered Earth's atmosphere over Chelyabinsk, Russia, and exploded at an altitude of 25.75km. Eyewitnesses could feel the intense heat from the fireball, and the blast wave from the explosion blew out windows in buildings. The blast wave took approximately 5minutes 30 seconds to reach ground level. (a) What was the average velocity of the blast wave? b) Compare this with the speed of sound, which is 343 m/s at sea level.arrow_forward
- 1. One object is dropped from a height h = 1.0202030304040505 m (initial velocity is zero) and it hits the ground after a time t₁. A second object is launched horizontally from the same height h = 1.0202030304040505 m (as shown in the figure below) with the horizontal velocity vo = 1.0102030405 m/s, and it hits the ground after a time t2. Compute the time difference At = t₂ - t₁. (Neglect the air friction). EXPLAIN YOUR ANSWER or SHOW YOUR WORK. A numerical value is required for credit. Do NOT round or truncate any numerical value at any point in the computation, SOLVE IN SYMBOLS. 1.0102030405 m/s 1.0202030304040505 marrow_forwardA tennis ball is thrown vertically upward with an initial velocity of +9.3 m/s. a) What will the ball's velocity be when it returns to its starting point? Answer in units of m/s. b) How long will the ball take to reach its starting point? Answer in units of´s.arrow_forwardAn Osprey can fly horizontally (not diving) at a maximum speed of 70.0 km/hr. The bird takes off from rest at the edge of a cliff, heading east, and accelerates at a rate of 1.21 m/s2. The osprey can decelerate at higher rate of 2.43 m/s2. a. If initially flying at top speed, how much time does it take for the hawk to come to a complete stop?b. How far does the Ospery travel during this time?c. The osprey has a mass of 2.2kg, what is the average force that must be applied by its wings in order to come to a stop?arrow_forward
- A model rocket is initially a height of H = 2.00 m above the ground. At t = 0, it is released from rest and has its engines ignited. Its engines generate an acceleration in the positive y-direction which changes with time of magnitude ßt, where = 18.00 m/s³. This acceleration doesn't include the effects of gravity. After 5.00 seconds have passed, the rocket's fuel will run out, and will no longer provide an upward thrust. Q4.1 Part (a) (a) Find the velocity and position of the rocket for all times t > 0. No files uploaded Q4.2 Part (b) H+ (b) What is the maximum height the rocket will reach? No files uploaded Q4.3 Part (c) (c) How long until the rocket returns to the ground? No files uploaded Q4.4 Part (d) (d) What is the minimum height, H, necessary for the rocket to safely launch? No files uploadedarrow_forwardSITUATION 15: A particle moves along a straight line such that its position is defined by sp=t-3t² +2. 107. Determine the average velocity. 4 m/s 5 m/s- b. 3 m/s d. 6 m/s a. c. 108. Determine the average speed. 4 m/s b. 3 m/s 5 m/s d. 6 m/s a. c. 109. Determine the acceleration of the particle at 4 seconds. a. 18 m/s² 15 m/s² b. 23 m/s² d. 36 m/s²arrow_forward3. Two ducks, Donald and Cassiopeia, are gliding gracefully toward each other along a pond, in a straight line. Donald is initially moving at y = 0.500 m/s, and begins accelerating at 0.100 m/s2 at t=0 s. Cassiopeia moves at a constant speed of v=0.700 m/s. If they are initially separated by 25.0 m, where will they collide? Take Donald's initial position as the origin. How long will it take for them to collide? 4. A car moves along a straight road. From the graph, which of the following could you conclude? a. The car is speeding up all the time. b. The car is slowing down all the time. c. The car speeds up at first, and then slows down. d. The car is moving at a constant velocity. position timearrow_forward
- College PhysicsPhysicsISBN:9781305952300Author:Raymond A. Serway, Chris VuillePublisher:Cengage LearningUniversity Physics (14th Edition)PhysicsISBN:9780133969290Author:Hugh D. Young, Roger A. FreedmanPublisher:PEARSONIntroduction To Quantum MechanicsPhysicsISBN:9781107189638Author:Griffiths, David J., Schroeter, Darrell F.Publisher:Cambridge University Press
- Physics for Scientists and EngineersPhysicsISBN:9781337553278Author:Raymond A. Serway, John W. JewettPublisher:Cengage LearningLecture- Tutorials for Introductory AstronomyPhysicsISBN:9780321820464Author:Edward E. Prather, Tim P. Slater, Jeff P. Adams, Gina BrissendenPublisher:Addison-WesleyCollege Physics: A Strategic Approach (4th Editio...PhysicsISBN:9780134609034Author:Randall D. Knight (Professor Emeritus), Brian Jones, Stuart FieldPublisher:PEARSON