The force of electrostatic attraction increases when which of the following are brought closer together?
a. Two negatively charged objects
b. Two positively charged objects
c. Two neutral objects
d. One positively charged object and one negatively charged object
Answer: d. One positively charged object and one negatively charged object
You might also like to view...
The change in entropy is Q/T for
A) all processes. B) reversible processes. C) irreversible processes. D) all real engines. E) exothermic processes.
Moment of Inertia: In the figure, a weightlifter's barbell consists of two identical small but dense spherical weights, each of mass 50 kg. These weights are connected by a thin 0.96-m rod with a mass of 24 kg. Find the moment of inertia of the barbell through the axis perpendicular to the rod at its center, assuming the two weights are small enough to be treated as point masses.
Fill in the blank(s) with the appropriate word(s).
Dark energy is the name of the
a. force that lead to the inflationary period of the Universe. b. five-dimensional space of the Universe. c. force suspected to cause the current acceleration in the rate of expansion of the Universe. d. one of the particles of dark matter related to WIMPs. e. the force that holds the proton together.
A real (non-Carnot) heat engine, operating between heat reservoirs at temperatures of 650 K and 270 K, performs 4.3 kJ of net work and rejects 8.0 kJ of heat in a single cycle. The thermal efficiency of this heat engine is closest to
A) 0.35. B) 0.31. C) 0.28. D) 0.38. E) 0.42.