Passage IX Q 119-123 MCAT 3Q 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)

A. It is 1/4 as fast

B. It is 1/2 as fast

C. It is 2 times as fastD. It is 4 times as fast

Passage IX Q 119-123 MCAT 3Q 120

Which of the following will occur when the magnet used in the flowmeter discussed in the passage is replaced with a stronger magnet?

A. The electric field will reverse polarity.

B. The electric field will decrease.

C. The voltage will increase.

D. Blood will flow faster.

Passage IX Q 119-123 MCAT 3Q 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?A. 5.0 x 10-6 m3/sB. 5 x 10-6 m3/sC. x 10-5 m3/sD. 2 x 10-5 m3/s

Passage IX Q 119-123 MCAT 3Q 122

If v increases by a factor of 2, by what factor does the volume flow rate of blood through the artery increase?A. 20.5

B. 2C. 4D. 8

Passage IX Q 119-123 MCAT 3Q 123

Which of the following describes the direction if the magnetic force on an ion moving in an artery past a flowmeter?A. Parallel to both the direction of v and the

direction of B. B. Parallel to the direction of v and

perpendicular to the direction of B. C. Perpendicular to the direction of v and parallel to

the direction of B. D. Perpendicular to both the direction of v and the

direction of B.

Passage XI Q 131-136 MCAT 3Q 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.A. Mercury was moving toward the Earth at the

time of the experiment. B. Mercury was moving away from the Earth at

the time of the experiment. C. Mercury was moving neither toward nor away

from the Earth at the time of the experiment. D. Mercury is not rotating.

Passage III Q 78-84 MCAT 4Q 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. A receiver moving at 900 m/s in the opposite

direction as the jet. B. A receiver moving at 300 m/s in the opposite

direction as the jet. C. A stationary receiver. D. A receiver moving at 300 m/s in the same

direction as the jet.

Passage III Q 78-84 MCAT 4Q 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?A. -1.2 Hz B. -1.5 Hz C. -2.2 Hz D. -3.0 Hz

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?A. B.

C. D.

Passage III Q 78-84 MCAT 4

spee

d

change in

spee

d

change in

spee

d

change in

spee

d

change in

Passage III Q 78-84 MCAT 4Q 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?

A. It decreases

B. It remains constant

C. It increases

D. It changes, but is not dependent on the speed.

Passage III Q 78-84 MCAT 4Q 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?

A. Sound waves travel more slowly. B. Sound waves have a much higher frequency.C. Sound waves have a much shorter

wavelength D. Interference in the atmosphere affects sound

waves much more.

Passage III Q 78-84 MCAT 4Q 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?A. 0 Hz B. 0.09 Hz C. 1.79 Hz D. 3.58 Hz

Passage III Q 78-84 MCAT 4Q 84

An 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?

A. The star is moving away from Earth. B. The wavelength of light that the star is emitting

changes constantly. C. The frequency of light that the star is emitting

changes constantly. D. The star is approaching Earth.

Magnetism

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

NS

Magnetism

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

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? Fingers with v, bend

fingers to B, thumb points in the direction of the force.

v

B

F = qvB sin

is the angle between v and B.

F big, outF = 0

F = 0

F big, inF smaller, in

F smallest, in

Magnetic Forces, Wires

Find the direction of the force on the wire placed in a B field.

I

B

F

F = qvB sin

F = IlB sin

qv becomes Il

B Fields caused by Currents

Compass needle and a wire

B Fields caused by Currents

Two currents1 2

Due to wire 1Due to wire 2

Forces equal and opposite, 3rd law

B Fields caused by Currents

Two currents1 2

Due to wire 1Due to wire 2

Forces equal and opposite, 3rd law

B Fields caused by Currents

Current loops

2

4

3

1

2 4

1

4

4

4

3 3

3

3

1

11

2

2

2

Net into

pageNet out of

page