Identify the FALSE statement:
A fifth-generation star would have a greater proportion of heavier elements than a second-generation star.
The elements of any person's body were once star matter; therefore we are all literally made of stardust.
Our Universe is so old there are no first-generation stars left in it.
Dense regions of a nebula pull in surrounding material and therefore grow in mass and density and rotate faster.
An accretionary disk eventually grows hot and massive enough to become a protostar, then a star.
Our Universe is so old there are no first-generation stars left in it.
(Because stars live for varied periods of time, the Universe always contains many different generations of stars)
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An up quark (u) has a charge of +2/3 and a down quark (d) has a charge of -1/3. Which of the following describes a neutron?
A) uuu B) uud C) udd D) ddd
A charge q = 3 × 10-6 C of mass m = 2 × 10-6 kg, and speed v = 5 × 106 m/s enters a uniform magnetic field. The mass experiences an acceleration a = 3 × 104 m/s2
What is the minimum magnetic field that would produce such an acceleration? A) 0.1 T B) 0.004 T C) 0.001 T D) 0.01 T E) 0.04 T
The reason the north pole of a bar magnet free to rotate points north is because
a. the south geographic pole of the earth is the earth's magnetic north pole. b. the south geographic pole of the earth is the earth's magnetic south pole. c. there is a net accumulation of negative magnetic charge at the earth's south geographic pole. d. there is a net accumulation of positive magnetic charge at the earth's north geographic pole. e. the north geographic pole of the earth is the earth's magnetic north pole.
Because S-waves do not travel through Earth's outer core, scientists inferred that the outer core is
A) impenetrable. B) molten liquid. C) solid. D) very dense.