The latent heat of vaporization of water is roughly 10 times the latent heat of fusion of water. The amount of heat required to boil away 1 kg of water is __________ the amount of heat required to melt 1 kg of ice
a. one tenth
b. equal to
c. 10 times
d. unrelated to
C
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Latent Heats: The melting point of aluminum is 660°C, its latent heat of fusion is 4.00 × 105 J/kg, and its specific heat is 900J/kg ? K. How much heat must be added to 500 g of aluminum originally at 27°C to completely melt it?
A. 485 kJ B. 395 kJ C. 273 kJ D. 147 kJ E. 14 kJ
What is the source of the large dust shells seen around some red giants and red supergiants?
A) Leftover material from their formation B) Debris left behind by a supernova C) Material from winds from these same stars D) Debris left behind by passing comets E) Star-forming molecular clouds
Which of the following methods describes the transit method for detecting extrasolar planets?
A) regular changes in the positions of the parent stars with respect to more distant stars as they move across the sky B) detection of Doppler shifts in the spectra of the parent stars C) detection of brightness changes in a star as a planet passes in front of it D) detection of reflected starlight
A 12-kg projectile is launched with an initial vertical speed of 20 m/s. It rises to a maximum height of 18 m above the launch point. What is the change in mechanical energy caused by the dissipative (air) resistive force on the projectile during this ascent?
A. ?0.64 kJ B. ?0.40 kJ C. ?0.52 kJ D. ?0.28 kJ E. ?0.76 kJ