The melting point of aluminum is 660°C, the latent heat of fusion is 4.0 × 105 J/kg and its specific heat is 900 J/(kg?K). How much heat must be added to 500 g of aluminum at 27°C to completely melt it?
A)
485 kJ
B)
395 kJ
C)
273 kJ
D)
147 kJ
E)
14 kJ
A
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Terminal Voltage and Internal Resistance: A battery has an emf ? = 78.0 V and an internal resistance r = 4.0 ?, as shown in the figure. A current of 4.7 A is drawn from the battery when a resistor R is connected across the terminals a and b. The power dissipated by the resistor R is closest to
A. 280 W. B. 340 W. C. 320 W. D. 300 W. E. 370 W.
A steel piano string is attached, under tension, at each end to secure posts. When gently struck, a faint note can be detected coming from the string. The string is then cooled by blowing cold air over it and then is struck again. How does the note now detected compare to the previous one
a. It is the same since the posts don't move. b. It is at a higher frequency than the original one. c. It is at a lower frequency than the original one. d. More than one answer is correct.
To determine the orbital period of a visual binary, we must measure
a. brightness. b. position on the sky. c. wavelengths. d. luminosity. e. temperature.
Beyond our own solar system, the planets found to date have tended to be:
A) Kuiper Belt objects, far from the glare of their suns. B) large jovians far from stars like our Sun. C) large jovians with orbits more like terrestrial planets. D) terrestrials very close to their star, and transiting its disk. E) imaginary, with no present proof that they really exist.