You have connected a loudspeaker that is facing upwards to a variable frequency source and notice that a small screw has fallen into the loudspeaker
As you increase the frequency of the signal you notice that at a frequency of 20.0 Hz the screw no longer moves with the speaker but starts to leave the surface of the speaker intermittently. What must be the amplitude of the oscillations?
A) 0.621 mm
B) 2.45 mm
C) 1.60 mm
D) 0.893 mm
E) 0.200 mm
A
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A. in the direction the proton is moving. B. opposite the direction the proton is moving. C. perpendicular to the direction the proton is moving. D. in the direction of the electric field. E. opposite the direction of the electric field.
The overall helium fusion reaction is
A) three helium nuclei fuse to form one carbon nucleus. B) two helium nuclei fuse to form one beryllium nucleus. C) two hydrogen nuclei fuse to form one helium nucleus. D) four helium nuclei fuse to form one oxygen nucleus.
A venturi tube may be used as the inlet to an automobile carburetor. If the 2.0-cm diameter pipe narrows to a 1.0-cm diameter, what is the pressure drop in the constricted section for an airflow of 3.0 m/s in the 2.0-cm section? (r = 1.2 kg/m3.)
a. 70 Pa b. 85 Pa c. 100 Pa d. 120 Pa e. 81 Pa
RMS and Peak Quantities: The potential applied to a 20-? resistor is v = (60 V) cos(33t). What is the rms current through this resistor?
Fill in the blank(s) with the appropriate word(s).