What is the source of the large dust shells seen around some red giants and red supergiants?
A) Leftover material from their formation
B) Debris left behind by a supernova
C) Material from winds from these same stars
D) Debris left behind by passing comets
E) Star-forming molecular clouds
C
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A coil of wire is connected to a galvanometer. When the coil is rotated in a magnetic field, the galvanometer records a current. The current results because
a. the coil acts like a transformer. b. the free electrons in the conductor experience a force when they move in the magnetic field. c. an electromagnetic wave is generated. d. the wire is ferromagnetic. e. none of the above.
Interaction partners
A. are equal in magnitude and opposite in direction and act on the same object. B. are equal in magnitude and opposite in direction and act on different objects. C. appear in a free-body diagram for a given object. D. always involve gravitational force as one partner. E. act in the same direction on the same object.
Calculate the kinetic energy (in eV) of a nonrelativistic neutron that has a de Broglie wavelength of 9.9 × 10-12 m. (h = 6.626 × 10-34 J ? s, mneutron = 1.675 × 10-27 kg, 1 eV = 1.60 10-19 J)
What will be an ideal response?
Which of the following is not a conserved quantity?
A) energy B) momentum C) angular momentum D) radiation