The oscillation of the 2.0-kg mass on a spring is described by 
where x is in centimeters and t is in seconds. What is the force constant of the spring?
A.
B.
C.
D.
E.
N/mAnswer: D
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Three flat layers of transparent material are stacked upon one another. The top layer has index of refraction n1, the middle has n2 and the bottom one has n3 . If n1 > n2 > n3, and if a ray of light strikes the top layer at an angle of incidence ?i = 30º, in which layer is the angle of refraction the greatest?
a. the top layer b. the middle layer c. the bottom layer d. Once the ray enters the touching layers, the angle of refraction remains constant.
How many grams of U-235 must be fissioned every day to produce 1000 MW of electricity in a nuclear power plant that is 1/3 efficient? [Assume 208 MeV/fission and 1 MeV = 1.6 × 10^?13 J]
When gas in a container is squeezed to half its volume, its density is
1) halved, 2) unchanged, 3) doubled, 4) quadrupled, and neglecting any temperature changes we would find the gas pressure to be 5) halved. 6) unchanged. 7) doubled. 8) quadrupled.
In a two-slit experiment, there are 11 bright fringes within the central diffraction maximum. What is the ratio of the slit width to the slit separation?
A. 5 B. 1/6 C. 1/5 D. 6