How can tidal forces affect the rotation of celestial bodies and their orbital motion?
What will be an ideal response?
Earth rotates eastward, and friction with the ocean beds drags the tidal bulges slightly eastward out of a direct Earth–Moon line. These tidal bulges are massive, and their gravitational field pulls the Moon forward in its orbit. As a result, the Moon's orbit is growing larger by about 3.8 cm a year, an effect that astronomers can measure by bouncing laser beams off reflectors left on the lunar surface by the Apollo astronauts.
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Double-Slit Interference: In a two-slit experiment, the slit separation is 3.00 × 10-5 m. The interference pattern is created on a screen that is 2.00 m away from the slits. If the 7th bright fringe on the screen is 10.0 cm away from the central fringe, what is the wavelength of the light?
A. 100 nm B. 204 nm C. 214 nm D. 224 nm E. 234 nm
How can microwave ovens heat food more quickly than conventional ovens?
a. Microwaves give energy directly to the molecules in the food. b. Conventional ovens must conduct heat from the surface to the interior of the food. c. Microwaves heat the inside as well as the surface of the food. d. all of the above
A 1.5-m string is held fixed at both ends. When driven by a 180-Hz source, the string vibrates in 3 distinct segments. What is the natural fundamental frequency of the string?
a. 30 Hz c. 90 Hz b. 60 Hz d. 540 Hz
Lines connecting locations having the same temperature are referred to as:
What will be an ideal response?