Which of these lamps is the longer lasting in a common circuit?
A) incandescent lamp
B) compact fluorescent lamp
C) light-emitting diode
D) all about the same
Answer: C
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A flat coil of wire is placed in a uniform magnetic field that is in the y direction. The magnetic flux through the coil is a maximum if the plane of the coil is: (More than one answer may be correct.)
1.in the xy plane 2.in the yz plane 3.in the xz plane 4.in any orientation, because it is a constant
An astronaut stands by the rim of a crater on the moon, where the acceleration of gravity is 1.62 m/s2
To determine the depth of the crater, she drops a rock and measures the time it takes for it to hit the bottom. If the time is 6.3 s, what is the depth of the crater? A) 10 m B) 14 m C) 26 m D) 32 m E) 38 m
The study of eclipsing binary star systems provides information about the radii of stars.
Answer the following statement true (T) or false (F)
Consider a parallel-plate capacitor with a dielectric material between the plates. If the temperature of the dielectric increases, the capacitance
1.increase 2.decrease 3.remains the same