If Q = 25 ?C, q = 10 ?C, and L = 40 cm in the figure, what is the magnitude of the electrostatic force on q?
a.
28 N
b.
22 N
c.
20 N
d.
14 N
e.
10 N
c
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Two-Source Interference of Sound: Two stereo speakers mounted 4.52 m apart on a wall emit identical sound waves. You are standing at the opposite wall of the room at a point directly between the two speakers. You walk 2.11 m parallel to the wall, to a location where you first notice that the sound intensity is essentially zero. If the wall along which you are walking is 10.7 m from the wall with the speakers, what is the wavelength of the sound waves? The walls are cushioned to absorb sound reflections.
A. 1.71 m B. 2.05 m C. 2.57 m D. 2.91 m
Our model for explaining the electrical interaction between charged objects
A. makes sense only at very high speeds. B. depends very strongly on the mass of the two objects. C. depends on the existence of three kinds of charge. D. postulates that an electric field surrounds each charged object.
Potassium Iodide (chemical formula: KI) has a face-centered cubic structure (just like sodium chloride). If the distance between crystal planes is d = 0.353 nm and X-rays of wavelength ? = 0.0934 nm are used, what is the smallest angle ? at which a diffraction maximum may be obtained?
a. 9.92° b. 7.60° c. 13.3° d. 15.5° e. 6.52°
A person can see well close up, but cannot do so in the distance. To correct this, lenses that are _____ having a _____ refractive power could be used
a. thicker at their center than at the edges, positive b. thicker at their center than at the edges, negative c. thinner at their center than at the edges, negative d. thinner at their center than at the edges, positive