A ?- decay occurs in an unstable nucleus when
A)
a proton is converted to an electron by the strong force.
B)
a proton is converted to a neutron by the strong force.
C)
a neutron is converted to a proton by the weak force.
D)
a neutron is converted to an alpha particle by the weak force.
E)
a neutron is converted to a beta particle by the weak force.
C
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Consider two vertical tubes of equal cross-section area, one containing water and the other mercury. If the liquid pressures at the bottom of the tubes are equal, both liquids would have equal
A) volumes. B) densities. C) weights. D) number of molecules. E) none of the above
In the context of planetology, explain the heat of formation
What will be an ideal response?
Two children seat themselves on a seesaw. The one on the left has a weight of 300 N while the one on the right weighs 200 N. The fulcrum is at the midpoint of the seesaw. If the child on the right is not at the end but is 1.50 m from the fulcrum and the seesaw is balanced, what is the torque provided by the weight of the child on the left? (Take ccw as positive.)
a. –300 N·m b. 300 N·m c. 450 N·m d. –450 N·m e. 150 N·m
Two parallel wires carry a current I in the same direction. Midway between these wires is a third wire, also parallel to the other two, which carries a current 0.5 I, but in the direction opposite from the first two wires. In which direction are the net forces on the outer wires?
a. Since the net forces are zero, there is no direction. b. Both forces are toward the center wire. c. Both forces are away from the center wire. d. Both forces on the two wires are in the same direction in space.