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Passage IX Q 119-123 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

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passage ix q 119 123 mcat 3
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
passage ix q 119 123 mcat 32
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.
passage ix q 119 123 mcat 33
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
passage ix q 119 123 mcat 34
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
passage ix q 119 123 mcat 35
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.
passage xi q 131 136 mcat 3
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.
passage iii q 78 84 mcat 4
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.
passage iii q 78 84 mcat 48
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
passage iii q 78 84 mcat 49
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
passage iii q 78 84 mcat 410
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.
passage iii q 78 84 mcat 411
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.
passage iii q 78 84 mcat 412
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
passage iii q 78 84 mcat 413
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.
magnetism

N

S

Magnetism

This field could be created by a magnet, or...

magnetism15
Magnetism

by a current loop.

What direction is the current in the loop?

magnetic forces rhr

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.

magnetic forces wires

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

b fields caused by currents
B Fields caused by Currents

Compass needle and a wire

b fields caused by currents19

Due to wire 2

Due to wire 1

B Fields caused by Currents

Two currents

1

2

Forces equal and opposite, 3rd law

b fields caused by currents20

Due to wire 2

Due to wire 1

B Fields caused by Currents

Two currents

1

2

Forces equal and opposite, 3rd law

b fields caused by currents21

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