Which of the following is not a characteristic of the stars of the disk component of our galaxy?
a. circular orbits
b. randomly inclined orbits
c. higher metal abundance
d. young stars
e. star formation regions
B
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The higher the temperature of an object, the
A) longer the wavelengths it radiates. B) shorter the wavelengths it radiates. C) makes no difference in the wavelengths it radiates
A step-up transformer steps up voltage by ten times. If voltage input is 120 volts, voltage output is
A) 60 V. B) 120 V. C) 1200 V. D) 12000 V. E) none of the above
The neutral deuterium atom, H, has a mass of 2.014102 u; a neutral hydrogen atom has a mass of 1.007825 u; a neutron has a mass of 1.008665 u; and a proton has a mass of 1.007277 u. What is the binding energy of the H nucleus? 1 u = 931.494 MeV/c2
A) 1.1 MeV B) 1.7 MeV C) 2.2 MeV D) 2.9 MeV E) 3.4 MeV
A 44.0-g block of ice at -15.0°C is dropped into a calorimeter (of negligible heat capacity) containing 100g of water at 5.0°C
When equilibrium is reached, how much of the ice will have melted? 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) 5.2 g B) 4.4 g C) 21 g D) 2.1 g E) 52 g