On a smooth horizontal floor, an object slides into a spring which is attached to another mass that is initially stationary. When the spring is most compressed, both objects are moving at the same speed
Ignoring friction, what is conserved during this interaction? A) momentum and mechanical energy
B) momentum only
C) kinetic energy only
D) momentum and kinetic energy
E) momentum and potential energy
A
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Lens-Maker Formula: A double-concave lens has equal radii of curvature of magnitudes 15.1 cm. An object placed 14.2 cm from the lens forms a virtual image 5.00 cm from the lens. What is the index of refraction of the lens material?
A. 1.98 B. 2.06 C. 1.90 D. 1.84
What was the first evidence that quasars were different from astronomical objects before they were observed in visual wavelengths?
a. The first quasars were seen to have fuzz. b. Quasars emitted radio energy like active galaxies, but appeared to be point sources in radio wavelengths. c. Quasars showed significant gravitational lens effects. d. The spectra of quasars looked like that of an M dwarf. e. The larger redshifts originally indicated that they were orbiting the center of the Milky Way.
Which of the following requires all U.S. government agencies' websites use accessibility technology and follow accessibility guidelines.
A. W3C B. WAI C. Section 508 of the U.S. Rehabilitation Act D. The first amendment to the U.S. Constitution.
A body oscillates with simple harmonic motion along the x axis. Its displacement varies with time according to the equation x = 5.0 cos (?t). The magnitude of the acceleration (in m/s2) of the body at t = 1.0 s is approximately
A. 3.5. B. 49. C. 14. D. 43. E. 4.3.