Which of the following elements commonly forms an ion with a 1– charge?
a. Ag
b. N
c. Br
d. Na
c
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A bowling ball size probe from a spaceship and a pebble size object land on a large asteroid that is far from any star. After a long period of time has passed, it is highly probable that the pebble and the probe
a. have each had the same change in temperature. b. have each had the same change in volume. c. are in thermal equilibrium with one another. d. are not in thermal equilibrium with one another. e. are in thermal equilibrium with one another, but are not at the same temperature.
A hollow cylinder with an inner radius of 4.0 mm and an outer radius of 30 mm conducts a 3.0-A current flowing parallel to the axis of the cylinder. If the current density is uniform throughout the wire,
what is the magnitude of the magnetic field at a point 12 mm from its center? (?0 = 4? × 10-7 T ? m/A) A) 7.2 × 10-6 T B) 8.0 × 10-6 T C) 8.9 × 10-7 T D) 7.1 × 10-8 T
The number of protons in a nucleus is the
a. mass number. b. neutron number. c. atomic number. d. isotope number. e. none of the above
The first scientist to determine that the orbits of the planets are ellipses was
A. Kepler. B. Newton. C. Ptolemy. D. Copernicus. E. Galileo.