What do astronomers generally believe about the origin of Mars's moons?
a. They formed with the planet out of the protoplanetary material.
b. They formed elsewhere and were captured at a later time.
c. They were ejected from Mars during its formation.
d. They were once a single moon and a later catastrophic event broke them in two.
b
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All four jovian planets are oblate, with larger polar than equatorial diameters
Indicate whether the statement is true or false
Which of statement below about black holes is not true?
A) A spaceship passing near a 10 solar-mass black hole is much more likely to be destroyed than a spaceship passing at the same distance from the center of a 10 solar-mass main-sequence star. B) We have strong observational evidence that black holes really exist. C) If you watch someone else fall into a black hole, you will never see the person cross the event horizon; you'll only see the person fade from view as the light he or she reflects (or emits) becomes more and more redshifted. D) If you fell into a black hole, you would experience time to be running normally as you plunged rapidly across the event horizon.
Which property does color best represent?
a. velocity b. thermal energy c. temperature d. heat
Calorimetry: A 35-g block of ice at -14°C is dropped into a calorimeter (of negligible heat capacity) containing 400 g of water at 0°C. When the system reaches equilibrium, how much ice is left in the calorimeter? The specific heat of ice is 2090 J/kg ? K, that of water is 4186 J/kg ? K, and the latent heat of fusion of water is 33.5 × 104 J/kg.
A. 32 g B. 33 g C. 35 g D. 38 g E. 41 g