What is the change in entropy (DS) when two moles of silver (108 g/mole) is completely melted at 961°C? (The heat of fusion of silver is 8.82 × 10^4 J/kg.)
a. 5.53 J/K
c. 15.4 J/K
b. 7.72 J/K
d. 12.1 J/K
C
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Force on a Moving Charge: A geophysicist measures the magnetic force on a proton that is moving vertically downward at a point 1.996 km/s at the earth's equator. At that location, the earth's magnetic magnetic field is horizontal and has a strength of 0.40 × 10-4 T. What are the magnitude and direction of the force she will measure? (e = 1.60 × 10-19 C)
What will be an ideal response?
The distribution of stars in the Galactic Bulge reminds us of the distribution of objects in the solar system's ________ Belt beyond Neptune
A) Oort B) Shapley C) Hubble D) Kuiper E) Kepler
A 2.0-kg ball moving eastward at 3.0 m/s suddenly collides with and sticks to a 4.0-kg ball moving northward at 2.0 m/s. What is the magnitude of the momentum of this system just after the collision?
A) 10 kg ? m/s B) 6.0 kg ? m/s C) 8.0 kg ? m/s D) 2.0 kg ? m/s E) 14 kg ? m/s
A pipe of diameter 4 cm is replaced by one of the same length but of diameter 5 cm. If the pressure difference between the ends of the pipe remains the same, by what factor is the rate of flow of a viscous liquid through it changed?
a. 5.1 c. 2.4 b. 3.4 d. 1.5