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A+P Quiz 3
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Gravity
Terms in this set (74)
2 muscles of the middle ear
stapedius & tensor tympani
ME muscles are featherlike, or __________________
penniform
ME muscles are encased in ______________ and attached to ___________ via ___________
bony canals, ossicles, tendons
stapedius muscle is _________ long
6mm
stapedius m. housed in _______________ wall of the middle ear
posterior
stapedius m. tendon courses ________________ from the _____________ and attaches to ______________________
horizontally, pyramidal eminence, neck of stapes
contraction of stapedius m. pulls stapes ___________
posteriorly
stapedius m. innervated by ______________
CN 7 facial
tensor tympani is ___________ long
25mm
tensor tympani housed in the ______________ and ___________ walls, superior to ____________________
medial, anterior, eustachian tube
tensor tympani fibers originate from (3)
eustachian tube, walls of its own canal, sphenoid bone
tensor tympani exits from _______________, hooks around _____________, and attaches to top of _____________
canal, cochleariform process, manubrium
tensor tympani contraction pulls malleus in _________________ direction
medial-anterior
tensor tympani innervated by
CN 5 trigeminal
functions of stapedius m. (3)
1. contracts in response to loud sounds (AR)
2. contracts prior to speech
3. small ongoing contractions to smooth resonance peak and attenuate internal sounds
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A 550-N physics student stands on a bathroom scale in an elevator that is supported by a cable. The combined mass of student plus elevator is 850 kg. As the elevator starts moving, the scale reads 450 N. (a) Find the acceleration of the elevator (magnitude and direction). (b) What is the acceleration if the scale reads 670 N? (c) If the scale reads zero, should the student worry? Explain. (d) What is the tension in the cable in parts (a) and (c)?
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Distinguish between an elastic and an inelastic collision.
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A potential difference $V ( t ) = V _ { 0 } \sin \omega t$ is maintained across a parallel-plate capacitor with capacitance C consisting of two circular parallel plates. A thin wire with resistance R connects the centers of the two plates, allowing charge to leak between plates while they are charging. (a) Obtain expressions for the leakage current $I _ { \mathrm { res } } ( t )$ in the thin wire. Use these results to obtain an expression for the current $I _ { \text { real } } ( t )$ in the wires connected to the capacitor. (b) Find the displacement current in the space between the plates from the changing electric field between the plates. (c) Compare $I _ { \text { real } } ( t )$ with the sum of the displacement current $I _ { \mathrm { d } } ( t )$ and resistor current $I _ { \mathrm { res } } ( t )$ between the plates, and explain why the relationship you observe would be expected.
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