A merry-go-round of radius R = 2.0 m has a moment of inertia I = 250 kg×m2, and is rotating at 10 rpm. A child whose mass is 25 kg jumps onto the edge of the merry-go-round, heading directly toward the center at 6.0 m/s. The new angular speed (in rpm) of the merry-go-round is approximately
a. 10
b. 9.2
c. 8.5
d. 7.1
e. 6.4
D
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Surrounding every stationary electron is
A) a magnetic field. B) an electric field. C) both of these D) neither of these
A wire is 12.00 m long and has a diameter of 1.50 mm. The tensile modulus of the wire is 
If a force of 500 N is applied to end of the wire, then the increase in length of the wire is
A. 38.5 mm. B. 40.2 mm. C. 44.1 mm. D. 48.5 mm. E. 51.50 mm.
Two long parallel wires carry unequal currents in opposite directions. The ratio of the currents is 3 to 1 . The magnitude of the magnetic field at a point in the plane of the wires and 10 cm from each wire is 4.0 ?T. What is the larger of the two currents?
a. 0.5 A b. 1.0 A c. 1.5 A d. 2.0 A e. 3.0 A
One problem with the planetary model of the atom is that it
A) cannot explain boiling, freezing, and other transitions between the three common states of matter. B) cannot explain electrical effects. C) cannot explain the observed spectrum of the various types of atoms.