1. Passage IX Q MCAT 3
Q 119 An 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 MCAT 3
Q 120 Which 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 MCAT 3
Q 121 What 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?
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 MCAT 3
Q 122 If v increases by a factor of 2, by what factor does the volume flow rate of blood through the artery increase?
. 2
. 4
. 8

5. Passage IX Q MCAT 3
Q 123 Which 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 MCAT 3
Q 131 A 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 MCAT 4
Q 78 A 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 MCAT 4
Q 79 If 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? Hz Hz Hz Hz

9. Passage III Q MCAT 4
Q 80 Which 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
change in 
speed
change in 
speed
change in 
speed
change in 

10. Passage III Q MCAT 4
Q 81 As 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 MCAT 4
Q 82 Why 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 MCAT 4
Q 83 A 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 Hz Hz Hz

13. Passage III Q MCAT 4
Q 84 An astronomer observes a hydrogen line in the spectrum of a star. The wavelength of hydrogen in the lab is x 10-7 m, but the wavelength in the star’s light is measured at x 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. Magnetism
This field could be created by a magnet, or... N S

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

16. 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 big, out
F = 0
F = 0
F smaller, in
F smallest, in
F big, in B
 is the angle between v and B.

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

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

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

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

21. B Fields caused by Currents1 1
Current loops 3 1
Net into page 2 4 1 4 2
Net out of page 4 2 2 3 3 1