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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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)
Q 120Which of the following will occur when the magnet used in the flowmeter discussed in the passage is replaced with a stronger magnet?
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?
Q 122If v increases by a factor of 2, by what factor does the volume flow rate of blood through the artery increase?
Q 123Which of the following describes the direction if the magnetic force on an ion moving in an artery past a flowmeter?
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.
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?
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?
change in 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?
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?
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?
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?
by a current loop.
What direction is the current in the loop?
F smaller, in
F smallest, in
F big, inMagnetic 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.
F = 0
F = 0
is the angle between v and B.
Compass needle and a wire