Three point charges are positioned on the x axis. If the charges and corresponding positions are +32 mC at x = 0, +20 mC at x = 40 cm, and -60 mC at x = 60 cm, what is the magnitude of the electrostatic force on the +32-mC charge?
a. 84 N
b. 12 N
c. 36 N
d. 50 N
e. 48 N
B
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Latent Heats: A substance has a melting point of 20°C and a heat of fusion of 3.4 × 104 J/kg. The boiling point is 150°C and the heat of vaporization is 6.8 × 104 J/kg at a pressure of one atmosphere. The specific heats for the solid, liquid, and gaseous phases are 600 J/kg ? K (solid), 1000 J/kg ? K (liquid), and 400 J/kg ? K (gaseous). How much heat is required to raise the temperature of 1.90 kg of this substance from -4°C to 106°C at a pressure of one atmosphere?
A. 260 kJ B. 190 kJ C. 230 kJ D. 92 kJ E. 320 kJ
What is the significance of the Planck time?
A) It is the amount of time required for two protons to fuse to make deuterium. B) It is the time at which inflation is thought to have occurred. C) It is the time when the cosmic microwave background was released. D) Before it, conditions were so extreme that our current understanding of physics is insufficient to predict what might have occurred.
Compared with the period of satellites in close Earth orbit, the period of satellites orbiting far from Earth is
A) shorter. B) the same. C) longer. D) need more information
A potter's wheel with a moment of inertia of 8.0 kg-m2 has 5.0 N-m applied to it. It starts from rest. 10. s later it has gained what kinetic energy?
A) 44. J B) 0.12 kJ C) 78. J D) 1.6 kJ E) 53. J