A particle (m = 50 g, q = 5.0 ?C) is released from rest when it is 50 cm from a second particle (Q = ?20 ?C). Determine the magnitude of the initial acceleration of the 50-g particle
a. 54 m/s2
b. 90 m/s2
c. 72 m/s2
d. 65 m/s2
e. 36 m/s2
c
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The asteroid belt is located
A) between the orbits of Mars and Jupiter. B) between the orbits of Earth and Mars. C) between the orbits of Jupiter and Saturn. D) beyond the orbit of Neptune.
A body of mass 1 kg is pushed across a horizontal table by a force of 1 N. The observed acceleration is 0.7 m/s2. The force of friction opposing the motion is ________ N.
Fill in the blank(s) with the appropriate word(s).
The largest known black holes:
A) create the dark nebulae in the plane of the Milky Way. B) can be no more than 1.4 solar masses, according to Chandrasekhar. C) lie in the cores of the most massive galaxies. D) can be no bigger than a small city, just like neutron stars. E) can be no bigger than the Earth, like white dwarfs.
In an adiabatic free expansion
a. no heat is transferred between a system and its surroundings. b. the pressure remains constant. c. the temperature remains constant. d. the volume remains constant. e. the process is reversible.