________ are star-like objects that contain less than 0.08 solar masses and will never raise their core temperatures high enough that the proton-proton chain can begin. Other minor fusion reactions do occur in these objects. They fall in a gap between the low-mass M dwarf stars and the massive planets in which nuclear fusion never occurs
a. Brown dwarfs
b. Herbig-Haro objects
c. Bok globules
d. T-Tauri star
e. Main-sequence stars
a
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If a nitrogen atom and a slightly heavier oxygen atom have equal kinetic energies, which has the greater average speed?
A) nitrogen B) oxygen C) both the same D) need more information
Which of the following most affects the wavelength of a mechanical wave moving through a medium?
a. the nature of the medium b. the amplitude c. the height of the crest d. the energy carried by the wave
What sorts of materials serve as moderators in nuclear reactors?
a. water b. boron c. graphite d. concrete
A 10-kg block on a rough horizontal surface is attached to a light spring (force constant = 1.4 kN/m). The block is pulled 8.0 cm to the right from its equilibrium position and released from rest. The frictional force between the block and surface has a magnitude of 30 N. What is the kinetic energy of the block as it passes through its equilibrium position?
a. 4.5 J b. 2.1 J c. 6.9 J d. 6.6 J e. 4.9 J