A parallel-plate capacitor has a voltage V = 6.0 V between its plates. Each plate carries a surface charge density ? = 7.0 nC/m2. What is the separation of the plates?
A)
8.2 mm
B)
2.5 mm
C)
1.2 mm
D)
5.6 mm
E)
7.6 mm
E
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A solid sphere, a solid cylinder, and a hoop all have the same mass and radius. Each are sent down identical inclined planes starting from rest. Their kinetic energies at the bottom of the incline are Ksphere, Kcylinder, and Khoop. Which of the following is true?
a. Ksphere > Kcylinder b. Khoop > Ksphere c. Khoop > Kcylinder d. Kcylinder > Khoop e. No answer above is correct.
Extra mass dumped on a white dwarf creates a nova, but if dumped on a neutron star, it creates
A) a millisencond pulsar. B) an X-rays burster. C) a black hole. D) a gamma-ray burster. E) a pulsar.
Which of the following wavelength regions cannot be studied with telescopes on the ground?
A) radio waves B) X-rays C) ultraviolet D) both B and C E) both A and C
The Earth rotates 360 degrees on its axis
twice a day such that the Sub rises in the West and sets in the East. once a day such that the Sun rises in the East and sets in the West. twice a day such that the Sun rises in the East and sets in the West. once a day such that the Sun rises in the West and sets in the East.