Which type of heavy atomic nuclei are most common, and why?
A) Transuranium elements, for only very heavy elements are made in supernovae.
B) Odd numbered elements, because hydrogen is the building block for all heavier elements.
C) Even numbered elements, for helium is "giant food" for everything beyond itself.
D) Metals, for iron is the last abundant element formed before the type II supernova.
E) Noble gases, for they are the most stable elements.
C
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A math book and a science book are tied together with a length of string. With the string taut, one book is pushed off the edge of a table. As it falls, the other book is dragged horizontally across the table surface
With no friction, acceleration of the books is A) zero. B) g/2. C) g. D) between zero and g. E) greater than g.
Three identical 4.0-kg cubes are placed on a horizontal frictionless surface in contact with one another. The cubes are lined up from left to right and a force is applied to the left side of the left cube causing all three cubes to accelerate to the right at 4.0 m/s2 . What is the magnitude of the force exerted on the right cube by the middle cube in this case?
a. 16 N b. 32 N c. 24 N d. 19 N e. none of the above
In the H-R diagram, 90 percent of all stars are
a. in the giant region. b. in the supergiant region. c. among the B stars. d. among the G stars. e. on the main sequence.
Three coplanar parallel straight wires carry equal currents I to the right as shown below. Each pair of wires is a distance a apart. The direction of the magnetic force on the middle wire
a.
is up out of the plane of the wires.
b.
is down into the plane of the wires.
c.
is in the plane of the wires, directed upwards.
d.
is in the plane of the wires, directed downwards
e.
cannot be defined, because there is no magnetic force on the middle wire.