For a point mass equal to that of the Sun, how far does the Schwarzschild radius extend from its center?
a. A few kilometers away
b. A few solar radii away
c. A few astronomical units (AU) away
d. A few parsecs away
a
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Optical scanners at the grocery store often use He-Ne ______________
Fill in the blank(s) with correct word
The positron
a. is an antielectron. b. was the first antimatter particle discovered. c. is the same as a proton. d. all of the above
A parallel-plate vacuum capacitor has an area of 1×10-4m2, a spacing between the plates of 1×10-3 m, and a voltage of 1 V.
(a) Calculate the capacitance of this capacitor. (b) A microcapacitor is replacing the capacitor in part (a). It must have the same capacitance; however, the new area is 1×10-10 m2, and the spacing between the plates is now 1×10-6 m, with 1 V applied. (b1) What is the dielectric constant and dielectric strength required for the material inthe microcapacitor? (b2) Are there any materials available that can meet these requirements, and if so, what are they? (b3) What is the polarization (P) in this microcapacitor, and how does this polarization compare to the surface-charge density if this were a vacuum capacitor?
When objects at different temperatures are brought into thermal contact with one another, the resulting spontaneous flow of heat proceeds from the object with the higher
A) thermal conductivity to the one with the lower thermal conductivity. B) specific heat to the one with the lower specific heat. C) heat capacity to the one with the lower capacity. D) temperature to the one with the lower temperature. E) impossible to predict on the basis of this data.