The horizontal speed of a projectile
a. is zero
b. stays constant
c. continuously increases
d. continuously decreases
e. sometimes decreases and sometimes increases
B
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When light passes at an angle to the normal from one material into another material in which its speed is higher,
a. it is bent toward the normal to the surface. b. it always lies along the normal to the surface. c. it is unaffected. d. it is bent away from the normal to the surface.
How is RNA different from DNA?
A) its monomers do not contain nucleotide bases B) it is single stranded rather than consisting of a double helix C) it consists of a triple helix rather than a double helix D) its strands are much longer than DNA
What observation made of other stars seems to suggest the solar nebula hypothesis is correct?
a. Stars are found to exist more often in binaries than by themselves. b. Protostars are seen to radiate much of their light at infrared wavelengths. c. Nearby stars tend to be low mass red dwarfs. d. Young stars are found to have hot disks that surround them.
A 25.0-g string is stretched with a tension of 43.0 N between two fixed points 12.0 m apart. What is the frequency of the second harmonic?
A) 6.00 Hz B) 12.0 Hz C) 18.0 Hz D) 24.0 Hz E) 36.0 Hz