Passage IX Q 119-123 MCAT 3 - PowerPoint PPT Presentation

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Passage IX Q 119-123 MCAT 3

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  1. Passage IX Q 119-123 MCAT 3 Q 119An artery is constricted at one location to 1/2 its normal cross-sectional area. How does the speed of blood flow past the constriction compare to the speed of blood flow in the rest of the artery? (Assume ideal fluid flow) • . It is 1/4 as fast • . It is 1/2 as fast • . It is 2 times as fast • . It is 4 times as fast

  2. Passage IX Q 119-123 MCAT 3 Q 120Which of the following will occur when the magnet used in the flowmeter discussed in the passage is replaced with a stronger magnet? • . The electric field will reverse polarity. • . The electric field will decrease. • . The voltage will increase. • . Blood will flow faster.

  3. Passage IX Q 119-123 MCAT 3 Q 121What is the volume flow rate of blood that moves at 0.02m/s through an artery with a diameter of 1.0 x 10-2 m? • . 5.0 x 10-6 m3/s • . 5 x 10-6 m3/s • .  x 10-5 m3/s • . 2 x 10-5 m3/s

  4. Passage IX Q 119-123 MCAT 3 Q 122If v increases by a factor of 2, by what factor does the volume flow rate of blood through the artery increase? • . 20.5 • . 2 • . 4 • . 8

  5. Passage IX Q 119-123 MCAT 3 Q 123Which of the following describes the direction if the magnetic force on an ion moving in an artery past a flowmeter? • . Parallel to both the direction of v and the direction of B. • . Parallel to the direction of v and perpendicular to the direction of B. • . Perpendicular to the direction of v and parallel to the direction of B. • . Perpendicular to both the direction of v and the direction of B.

  6. Passage XI Q 131-136 MCAT 3 Q 131A radar signal is transmitted to Mercury from Earth. The signal is reflected and returns to Earth with a frequency that is 1.3 x 106 Hz. The frequency change is best represented by which of the following. • . Mercury was moving toward the Earth at the time of the experiment. • . Mercury was moving away from the Earth at the time of the experiment. • . Mercury was moving neither toward nor away from the Earth at the time of the experiment. • . Mercury is not rotating.

  7. Passage III Q 78-84 MCAT 4 Q 78A stationary receiver detects a change in frequency of the signal from a jet flying directly away from it at 300 m/s. Which of the following receivers will detect the same change in frequency from a jet moving away at 600 m/s? • . A receiver moving at 900 m/s in the opposite direction as the jet. • . A receiver moving at 300 m/s in the opposite direction as the jet. • . A stationary receiver. • . A receiver moving at 300 m/s in the same direction as the jet.

  8. Passage III Q 78-84 MCAT 4 Q 79If the jet in Experiment 1 transmits a 2.5 x 106 Hz radio wave, what will be the approximate change in frequency measured at the receiver? • . -1.2 Hz • . -1.5 Hz • . -2.2 Hz • . -3.0 Hz

  9. Q 80Which of the following graphs best illustrates the relationship between the speed of the transmitter away from the receiver and the increase in wavelength of the received signal? . B. . D. speed speed speed speed change in  change in  change in  change in  Passage III Q 78-84 MCAT 4

  10. Passage III Q 78-84 MCAT 4 Q 81As the speed of the jet flying away from the jet increases, what happens to the distance between adjacent peaks of the transmitted wave, as measured at the receiver? • . It decreases • . It remains constant • . It increases • . It changes, but is not dependent on the speed.

  11. Passage III Q 78-84 MCAT 4 Q 82Why are the percentages of the change in frequency and wavelength much greater when sound waves are used instead of radio waves in these experiments? • . Sound waves travel more slowly. • . Sound waves have a much higher frequency. • . Sound waves have a much shorter wavelength • . Interference in the atmosphere affects sound waves much more.

  12. Passage III Q 78-84 MCAT 4 Q 83A receiver is in a jet that is flying alongside another jet that is emitting 2.0 X 106 Hz radio waves. If the jets fly at 268 m/s, what is the change in frequency detected at the receiver? • . 0 Hz • . 0.09 Hz • . 1.79 Hz • . 3.58 Hz

  13. Passage III Q 78-84 MCAT 4 Q 84An astronomer observes a hydrogen line in the spectrum of a star. The wavelength of hydrogen in the lab is 6.563 x 10-7 m, but the wavelength in the star’s light is measured at 6.56186 x 10-7. Which of the following explains this discrepancy? • . The star is moving away from Earth. • . The wavelength of light that the star is emitting changes constantly. • . The frequency of light that the star is emitting changes constantly. • . The star is approaching Earth.

  14. N S Magnetism This field could be created by a magnet, or...

  15. Magnetism by a current loop. What direction is the current in the loop?

  16. F big, out F smaller, in F smallest, in F big, in Magnetic Forces RHR A positive charge moves in a B-field that points to the right. What direction is the force on the charge for each case? F = qvB sin  Fingers with v, bend fingers to B, thumb points in the direction of the force. v F = 0 F = 0 B  is the angle between v and B.

  17. F I B Magnetic Forces, Wires Find the direction of the force on the wire placed in a B field. F = qvB sin F = IlB sin qv becomes Il

  18. B Fields caused by Currents Compass needle and a wire

  19. Due to wire 2 Due to wire 1 B Fields caused by Currents Two currents 1 2 Forces equal and opposite, 3rd law

  20. Due to wire 2 Due to wire 1 B Fields caused by Currents Two currents 1 2 Forces equal and opposite, 3rd law

  21. 1 1 3 2 4 1 2 4 4 2 4 3 2 3 3 1 B Fields caused by Currents Current loops 1 Net into page 4 Net out of page 2 3