What is at the center of a planetary nebula?
A: the core of the dying star
B: something that will eventually become a neutron star
C: something that will eventually become a white dwarf
D: both A and B
E: both A and C
Ans: E: both A and C
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Which wavelength band uses observatories on aircraft?
a. ultraviolet b. visual c. infrared d. X-ray
The position function x(t) of a particle moving along an x axis is x = 5.00 - 6.00t2, with x in meters and t in seconds. (a) At what time and (b) where does the particle (momentarily) stop? At what (c) negative time and (d) positive time does the particle pass through the origin?
As you stand by the side of the road, a car approaches you at a constant speed, sounding its horn, and you hear a frequency of 80.0 Hz
After the car goes by, you hear a frequency of 60.0 Hz. What is the speed of the car? Assume that he speed of sound in air is 343 m/s. A) 64 m/s B) 49 m/s C) 16 m/s D) 36 m/s E) 25 m/s
A radioactive isotope that emits an alpha particle will change in what respect?
a. Atomic number decreases by four. b. Both choices a and b are valid. c. Mass number decreases by four. d. None of these choices are valid.