When a source of sound approaches, measurements will show an increase in the sound's
1) speed,
2) frequency,
3) wavelength,
4) all of these,
5) none of these,
and when a source of sound recedes, measurements will show an increase in the sound's
6) speed.
7) frequency.
8) wavelength.
9) all of these.
10) none of these.
Answer: 2, 8
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Suppose that the build-up of fatty tissue on the wall of an artery decreased the radius by 10%. By how much would the pressure provided by the heart have to be increased to maintain a constant blood flow?
What will be an ideal response?
A square conducting loop is situated such that it is vertical, in the x-z plane. The earth’s gravitational field points downward (in the –z direction). The loop is dropped, and maintains its orientation in the x-z plane. A magnetic field pointing in the +y direction exists and is uniform with respect to time, but varies as a function of z: B(z)=Bo (10m-z). The loop is dropped and allowed to fall under the influence of gravitation. You observe the loop from the +y direction. Which of the following occurs?
A. The situation is unclear because we do not know the initial conditions. B. There is a clockwise induced current. C. There is a counter-clockwise induced current. D. There is no induced current.
Find the equation 
that fits the following data.
a. 
b. 
c. 
d. 