An inductor has a current I(t) = (0.500 A) cos[(275 )t] flowing through it. If the maximum emf across the inductor is equal to 0.500 V, what is the self-inductance of the inductor?
A) 4.37 mH
B) 3.64 mH
C) 2.75 mH
D) 0.73 mH
E) 1.43 mH
Answer: B
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The event horizon
a. is believed to be a singularity. b. is a crystalline layer. c. has a radius equal to the Schwarzschild radius. d. marks the inner boundary of a planetary nebula. e. is located at the point where synchrotron radiation is created around a pulsar.
A parallel plate capacitor of capacitance C0 has plates of area A with separation d between them. When it is connected to a battery of voltage V0, it has charge of magnitude Q0 on its plates. While it is connected to the battery, the space between the plates is filled with a material of dielectric constant 3. After the dielectric is added, the magnitude of the charge on the plates and the new capacitance are what?
A.
Q0, 
C0B.
C0C.
D.
E.
An object 4.0 cm in height is placed 8.0 cm in front of a concave mirror with a focal length of 10.0 cm. What is the position of its image in relation to the mirror and what are its characteristics?
A) 40.0 cm on the other side of mirror, real, 6.0 times bigger B) 10.0 cm on the other side of mirror, virtual, 10.0 times bigger C) 18.0 cm on the same side of mirror, virtual, 2.25 times bigger D) 10.0 cm on the same side of mirror, real, 6.0 times bigger E) 40.0 cm on the other side of mirror, virtual, 5.0 times bigger
Imagine that you are trying to stop neutrinos with a lead shield. How thick would you need to make this shield to ensure that it can stop an average neutrino?
A) about one meter B) about 700,000 kilometers (the radius of the Sun) C) about 150 million kilometers (the size of an astronomical unit) D) about one light-year E) about 14 billion light-years (the size of the observable universe)