Suppose an object is moving in a straight line at 50 miles/hr. According to Newton's first law of motion, the object will
A) continue to move in a straight line at 50 miles/hr forever, no matter what happens.
B) continue to move in a straight line at 50 miles/hr until it is acted upon by a net force.
C) eventually slow down and come to a stop.
D) continually slow down, but never quite come to a complete stop.
B) continue to move in a straight line at 50 miles/hr until it is acted upon by a net force.
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The event horizon of a black hole is
A) the surface below which no matter or energy can escape. B) the surface where light becomes trapped in a circular orbit around the black hole. C) the physical surface of the black hole. D) the point in time when a black hole comes into being.
After a supernova event, what is left behind?
A) always a white dwarf B) always a neutron star C) always a black hole D) either a white dwarf or a neutron star E) either a neutron star or a black hole
The region around Earth where the magnetic field traps charged particles is the
A) ozone layer. B) exosphere. C) Van Allen Radiation Belts. D) corona. E) aurora borealis and australis.
A radioactive nuclide of atomic number Z emits an electron, then the daughter nuclide emits a gamma ray. What is the atomic number of the resulting nuclide after both processes?
A) Z - 1 B) Z + 2 C) Z - 3 D) Z + 1 E) Z - 2