The wavelengths of radiation from a star that is moving perpendicular to us
A) can be longer or shorter depending on the distance to the star
B) are shorter than if the star were not moving
C) are longer than if the star were not moving
D) are the same as if the star were not moving
D
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A longitudinal wave is represented by the equation z(z, t) = -2.0 cm sin(1,200 rad/s t - 20 
z). Another longitudinal wave is represented by the equation z(z, t) = +2.0 cm sin(1,200 rad/s t + 20
z). What is the equation that represents the superposition of the two waves?
A. z(z, t) = +4.0 cm cos(1,200 rad/s t) cos(20
z)
B. z(z, t) = +4.0 cm cos(1,200 rad/s t) sin(20z)
C. z(z, t) = +4.0 cm cos(1,200 rad/s t) cos(20z)
D. z(z, t) = -2.0 cm cos(1,200 rad/s t) sin(20z)
Total mechanical energy of a system is conserved when there are no ________ forces doing work on the system.
What will be an ideal response?
A dump truck has a loosely tied canvas over its empty bed, which is full of still air. As the truck speeds down the highway, the canvas will tend to
A. get pushed onto the load. B. billow outward from the load. C. lay limply in a jumbled pile. D. smooth out in a level, horizontal plane.
In a photoelectric effect experiment, the frequency of photons bombarding the surface is increased until photoelectrons just start to leave the surface. If this occurs at a frequency of 
what is the work function of the surface?
A. 1.0 eV B. 1.5 eV C. 2.0 eV D. 2.5 eV E. 3.0 eV