An bb gun pellet which has a of mass 20 g is shot horizontally into a foam board with a velocity of 60 m/s. It penetrates a depth of 20 cm before stopping. What force was required to stop the pellet? a) 180 N b) 360 N c) 90 N d) 45 N

An bb gun pellet which has a of mass 20 g is shot horizontally into a foam board with a velocity of 60 m/s. It penetrates a depth of 20 cm before stopping. What force was required to stop the pellet? a) 180 N b) 360 N c) 90 N d) 45 N

Physics for Scientists and Engineers

10th Edition

ISBN:9781337553278

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter9: Linear Momentum And Collisions

Section: Chapter Questions

Problem 46AP: Review. A bullet of mass m is fired into a block of mass M initially at rest at the edge of a...

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In research in cardiology and exercise physiology, it is often important to know the mast of blood pumped by a persons bran in one stroke. This information can be obtained by means of a ballistocardiograph. The instrument works as follows: The subject lies on a horizontal pallet floating on a film of air. Friction on the pallet is negligible. Initially, the momentum of the system is zero. When the heart beats, it expels a mass m of blood into the aorta with speed v, and the body and platform move in the opposite direction with speed V. The speed of the blood tan be determined independently (e.g., by observing an ultrasound Doppler shift). Assume that the bloods speed is 50.0 cm/s in one typical trial. The mass of the subject plus the pallet is 54.0 kg. The pallet moves at a speed of 6.00 105 m in 0.160 s after one heartbeat. Calculate the mass of blood that leaves the heart. Assume that the mass of blood is negligible compared with the total mass of the person. This simplified example illustrates the principle of ballistocardiography, but in practice a more sophisticated model of heart function is used.
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