A wave generated in a medium is a longitudinal wave when
a. there is a net transport of matter by the wave.
b. the molecules of the medium are unable to exert forces on each other.
c. molecular displacements are parallel to the wave velocity.
d. molecular displacements are perpendicular to the wave velocity.
e. the density of the medium is less than the density of water.
c
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Which pair are actually the same compound?
a. (CH3)3 N and CH3CH2CH2NH2 b. CH3CH2CH(NH2)CH3 and CH3CH(NH2)CH2CH3 c. CH3CH(Cl)CH3 and CH3CH2CH(Cl)CH3 d. CH3(CH2)2CH3 and CH3CH2CH(CH3)2 e. CH3CH2CH2NH2 and CH3CH2CH2N2H2
Two metal spheres on insulating stands have the same positive charge Q. If we reduce the distance between the spheres’ centers by a factor of two, the magnitude of the repulsive force between the spheres increases by
A. a bit less than a factor of two. B. exactly a factor of two. C. a bit more than a factor of two. D. a bit less than a factor of four. E. exactly a factor of four. F. a bit more than a factor of four.
Bob, of mass m, drops from a tree limb at the same time that Esther, also of mass m, begins her descent down a frictionless slide. If they both start at the same height above the ground, which of the following is true about their kinetic energies as they reach the ground?
1.Bob's kinetic energy is greater than Esther's. 2.Esther’s kinetic energy is greater than Bob's. 3.They have the same kinetic energy. 4.The answer depends on the shape of the slide.
Which of the following are possible causes for mass extinctions on Earth?
A) episodes of widespread volcanism B) impacts of asteroids C) snowball Earth episodes D) all of these can be responsible for mass extinctions