How does Mercury's rotation relate to the Sun?
A) Its rotation rate is 2/3 as long as its year, due to tidal resonances.
B) Its day is the same length as its year.
C) Its year is much shorter, only 88 days, than its slow rotation of 243 days on its axis.
D) It always keeps one face tidally locked toward the Sun, as our Moon does with us.
E) It does not spin at all, being tidal stopped by the solar tides.
A
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Observations of the tiny irregularities in the cosmic microwave background support the idea that the Universe
A. must be one of many "island universes." B. must contain about 5 times more dark matter than regular matter. C. does not contain dark energy. D. must contain hidden pockets of antimatter.
Two lenses, the first with focal length 10.0 cm and the second with focal length -12.5 cm, are separated by 20.0 cm. An object, 2.40 cm tall, is 15.0 cm in front of the first lens. What is the size of the final image?
A. 2.40 cm B. 4.80 cm C. 12.4 cm D. 24.0 cm E. 0.96 cm
Spiral arms help in star formation
Indicate whether the statement is true or false
The existence of the neutrino was postulated to account for which basic conservation laws during the beta decay process?
a. conservation of energy b. conservation of momentum c. Both choices a and b are valid. d. None of the above choices are valid.