What could happen in planetary systems where the nebular gas is quickly disbursed?
A) No terrestrial planets would form.
B) The only planets would be more massive than Jupiter.
C) Many planets would be destroyed by migration onto the central star.
D) Large ice-rich planetesimals would not be able to gather hydrogen and helium and become gas giants.
D
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The axis of rotation of a top changes its direction as the top spins because:
a. the inertia of the top keeps its orientation changing. b. conservation of rotational motion keeps the direction changing if it was changing to start. c. rotational kinetic energy causes the direction to shift. d. gravitational force exerts torque on the top. e. angular momentum is conserved.
Two identical planets orbit a star in concentric circular orbits in the star's equatorial plane. Of the two, the planet that is farther from the star must have
a. the smaller period. b. the greater period. c. the smaller gravitational mass. d. the larger gravitational mass. e. the larger universal gravitational constant.
An ideal spring stretches by 21.0 cm when a 135-N object is hung from it. If instead you hang a fish from this spring, what is the weight of a fish that would stretch the spring by
A) 199 N B) 91 N C) 145 N D) 279 N
A velocity selector uses a fixed electric field of magnitude E and the magnetic field is varied to select particles of various energies. If a magnetic field of magnitude B is used to select a particle of a certain energy and mass, what magnitude of magnetic field is needed to select a particle of equal mass but twice the energy?
a. 0.50 B b. 1.4 B c. 2.0 B d. 0.71 B e. 1.7 B