When discussing stellar lives, astronomers divide stars by mass into low-mass, intermediate-mass, and high-mass stars. Which category has the longest lifetimes?
A) low-mass stars
B) intermediate-mass stars
C) high-mass stars
A) low-mass stars
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A saturated hydrocarbon that is made up of eight
carbon atoms and eighteen hydrogen atoms is named a) octane. b) butane. c) methane. d) ethane.
Parallel-Plate Capacitor: Two parallel square metal plates that are 1.5 cm apart and 22 cm on each side carry equal but opposite charges uniformly spread out over their facing surfaces. How many excess electrons are on the negative surface if the electric field between the plates has a magnitude of 18,000 N/C? (k = 1/4??0 = 9.0 × 109 N ? m2/C2, e = 1.6 × 10-19 C)
What will be an ideal response?
The angular measurement in degrees north or south of the equator is
a) longitude. b) latitude. c) parallel. d) altitude.
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 zero 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