Which of the following must be occurring in order for a molecular cloud to collapse and form stars?
A) The inward pull of gravity must be stronger than the outward push of thermal pressure.
B) The mass of the cloud must continually increase, thereby increasing the strength of gravity.
C) The interior of the cloud must continually increase in temperature.
D) The gas in the cloud must be supported by electron degeneracy pressure.
A) The inward pull of gravity must be stronger than the outward push of thermal pressure.
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A steady horizontal force lasting for 2.1 s gives a 1.25 kg object an acceleration of 3.2 m/s2 on a frictionless table. What impulse does this force give to the object?
A) 11 kg ? m/s B) 26 kg ? m/s C) 2.6 kg ? m/s D) 8.4 kg ? m/s
If the frequency of a traveling wave train is increased by a factor of four in a medium where the speed is constant, which of the following is the result?
a. amplitude is one fourth as big c. wavelength is quadrupled b. amplitude is quadrupled d. wavelength is one fourth as big
Of the three types of nuclear decay, only __________ does not affect the atomic number of the nucleus
Fill in the blank(s) with correct word
As a huge rotating cloud of particles in space gravitate together forming an increasingly dense ball, it shrinks in size and
A) rotates slower. B) rotates at the same speed. C) rotates faster. D) cannot rotate.